Page 1 Page 2 ur Owner of the New ZETOR Tractor. present manual

Page 1 Page 2 ur Owner of the New ZETOR Tractor. present manual
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ZETOR 4718
ZETOR 5718
ZETOR 5748
ZETOR 6711
ZETOR 6718
ZETOR 6745
ZETOR 6748
CONTENTS
Specifications of 7 4712—4718.
Specifications of Z 5711—5748 .
Specifications of Z 6711—6748 .
Something about the tractor .
Pedals and levers .
Hydraulic circuit control levers .
Filling and draining orifices
Bleeding of the fuel system
Driver's seat
Electrical equipment and accessories
How to prepare the tractor for travelling
How to drive the tractor .
Hydraulic system of the tractor .
Brakes
Front axle
Rear wheels
Tyre inflating .
Tyre water filling
Special accessories
Front driven axle
Maintenance and adjustment
Maintenance instructions
Troubles and their remedies
12
17
23
25
29
31
34
36
36
38
40
43
44
44
47
48
49
50
51
63
69
75
SPECIFICATIONS
Tractor Z 4712 Z 4718
Engine Model Z 4701
Type 4 strokes diesel with direct injection
No. of Cylinders | 3
Bore 3.94” (100 mm)
Stroke 4.33” (110 тт)
Compression Ratio 17.0 : 1
Efficiency Class 45 HP
Cylinder Liners wet, independent for each cylinder
Nominal Revolutions 2200 RPM
Injector Timing 21° + 1° before TDC
Nozzles of Injection DOP 160 S 625—4343
Engine Weight 595 165. (270 Ка)
Cooling System Forced Circulation Water Cooling
with Thermoregulator
Oil Pump Geared
Oil Cleaner Fuli-flow-type
Fill up Data:
Engine Oil Sump 1.76 imp. galls. (8 litres)
Injection Pump 0.04 imp. galls. (0.2 litre)
Air Cleaner 0.28 imp. galls. (1.3 litre)
Gearbox
— on flat ground 4.18 imp. galls. (19 litres)
— onunplain ground 5,50 imp. galls. (25 litres)
Portals 0.84 imp. galls. (3.8 litres)
(2X0.42 imp. galls. = 23X1.9 litre)
Steering Box 0.42 imp. galls. (1.9 litre)
Cooling System 2.09 imp. galls. (9.5 litres)
Fuel Tank 10.34 imp. galls. (47 litres)
Brake Liquid Vessel 0.04 imp. galls. (0.2 litre)
Clutch Doble acting, power assisted (it is pos-
sible to install the clutch with indepen-
dent hand operated disengagement of
the power-take-off shaft)
Gearbox
Speeds of the
tractor provided
10 speeds forward: 5 road and
5 reduced ones,
2 reverse speeds: 1 road and
1 reduced one
with tyres 12.4/11-28
Road speeds:
1st speed 2.76 m. p. h. (4.44 km/h.)
2nd speed 4.10 m. p. h. (6.60 km/h.)
3rd speed 2.71 m. p. h. (9.19 km/h.)
4th speed 8.77 m. p. h. (14.12 km/h)
5th speed 14.64 m. p. h. (23.58 km/h.)
Transmission Ration
for Reduction Speeds 4,2762
Reduced Speeds:
1st speed 0.64 m. p. h. (1.04 km/h.)
2nd speed 0.96 m. p. h. (1.55 km/h.)
3rd speed 1.33 m. p. h. (2.15 km/h)
4th speed 2.05 m. p. h. (3.30 km/h)
5th speed 3.42 m. p. h. (551 km/h.)
Reverse Speeds:
Road speed 3.60 m. p. h. (5.79 km/h)
Reduced speed
Steering System
Brakes:
Foot brakes
Hand brake
PTO Drive
PTO dependent
revolutions on the
shifted-in speed
(through the
gearbox)
0.84 m. p. h. (1.35 km/h.)
Unilateral, ball-type (when a trouble
occurs not to disassemble it)
Double pedal hydraulic control
Band-type mechanical control
PTO Standard Revolutions
340 — 10 RPM at 2000 engine RPM
at the 1st speed 250.4 RPM
at the 2nd speed 372.7 RPM
at the 3rd speed 519.3 RPM
at the 4th speed 797.2 RPM
at the 5th speed 1331.6 RPM
at the reverse speed -326.8 RPM
Hydraulic Power Lift
Operating Pressure
Pump Efficiency
Lifting power
at Ball Joints
(31.5” = 800 mm)
Electrical Equipment
Storage battery
Dynamo
Voltage regulating
relay
Starter
Tyre Size
Front tyre standard
Front tyre optional
Rear tyre standard
Rear tyre optional
Main Dimensions
and Weights
(of tractors provided
with standard tyres)
Overall length
(without suspension
linkage)
Overall width
(at rear wheel track
of 56” = 1425 mm)
Height up to the
steering wheel
upper border
Ground clearance
Height of the
swinging bar
Wheel Base
10
63” (1600 mm)
1707 lbs./sq. in. (120 kp/sg. cm)
4.4 imp. galls./min. (20 litres/min.)
2205 tbs. (1000 kps)
12 V
12 V/12 Amp.
12 V/12 Amp.
12 V/A H.P.
6.60-16
6.50-16
12.4/11-28
14.9/13-28
12.4/11-32
9.5/ 9-32
Z 471? Z 4718
124” (3160 mm)
68” (1727 mm)
66” (1670 mm)
12” (298 mm)
14” (371 mm)
797 (1988 mm)
Front wheel track — 507 —54” —69”
adjustable (1280—1375--1750 mm)
Rear wheel track — 53” —71”
adjustable (1350—1800 mm)
Height of the
centre of gravity 27” (690 тт) 29” (745 тт)
Front axle ballast
weights 309 lbs. (140 kg) totaly
Rear wheel ballast
weigths 618 165. (280 kg) 463 Ibs. (210 kg)
Water in rear tyres 2x220 lbs. (2100 kg)
Travel ready tractor
provided with
hydraulic power lift 4519 |bs. (2050 kg) 5070 lbs. (2300 kg)
of which front
axle load 1675 lbs. (760 kp) 1841 lbs. (835 kp)
of which rear
axle load 2844 165. (1290 Кр) 3229 Ibs. (1465 kp)
Maximum tractor
weight together
with hydraulic
power lift, front axle
ballast weights and
rear wheels ballast
weights 5456 lbs. (2470 kg) 5842 |bs. (2650 kg)
of which front axle
load 1984 lbs. (900 Кр) 2161 lbs. (980 kp)
of which rear axle
load 3472 lbs. (1570 kp) 3681 lbs. (1670 kp)
Overall height
of the tractor 87” (2210 mm) 88” (2400 mm)
Tractor Power
Traction power of
the tractor in
suspension 4188 165. (1900 kp) 4409 Ibs. (2000 kp)
11
SPECIFICATIONS
Tractor 7 5711 Z 5718 Z 5745 Z 5748
Engine Model Z 5501
Type 4 strokes diesel with direct injection
No. of Cylinders 4
Stroke 4.33” (110 mm)
Bore 3,74” (95 mm)
Compression Ratio 17.0 : 1
Efficiency Class 55 HP
Cylinder Liners wet, separate for each cylinder
Nominal Revolutions 2200 RPM
Injector Timing 21° + 1° before TDC
Injection Nozzles ВОР 150$ 525—53
Engine Weight
without Accessories 871 lbs. (395 kg)
Cooling System Forced Circulation Water Cooling with
Thermoregulator
Qil Pump Geared
Oil Cleaner Centrifugal, full flow type
Fill up Data:
Engine Oil Sump 2.64 imp. galls. (12 litres)
Injection Pump 0.04 imp. galls, {0.2 litre)
Air Cleaner 0.28 imp. galls. (1.3 litre)
Gearbox
— on flat ground 5.50 imp. galls. 5.94 imp. galls,
(25 litres) (27 litres)
— in terrain 7 imp. galls. 7.5 imp. galls.
(32 litres) (34 litres)
Portals 0.84 imp. galls (3.8 litres)
(20.42 imp. galls. = 2X1.9 litre)
Steering Box 0.42 imp. galls. (1.9 litre)
Front Driven Axle Box — — 0.66 imp, galis
(3 litres)
Driven Axle — — 2X0.16 imp. galls
Double Joints Box (0.75 litre X2)
Power Assisting
Steering Device Tank 0.88 imp. galls (4 litres)
12
Fuel Tank 17.4 imp.galls 15 imp.galis 17.4 imp.galls 15 imp.galls
(79 litres) — (67 litres) (79 litres) (67 litres)
Cooling System 2.86 imp. galls (13 litres)
Brake Liquid Vessel 0.04 imp. galis (0.2 litre)
Clutch Double acting, power assisted (it is
possible to install the clutch with in-
dependent hand operated disengage-
ment of the PTO)
Gearbox 10 speeds forwards: 5 road and
5 reduced ones
2 reverse speeds: 1 road and
1 reduced one
(4th and 5th speeds synchronized —
optional only)
The torque multiplier delivered also
as an optional equipment doubles the
number of speeds
Speeds of the 14,9/13-28 14.9/13-28
tractor provided No torque With torque
with tyres multiplier multiplier
m. p. h. (km/h.) m. p. h. (km/h.)
Road speeds:
1st speed 2.70 (4.35) 3.54/2.70 (5.70/ 4.35)
2nd speed 4.00 (6.47) 5.28/4.00 (8.49/ 6.47)
3rd speed 5.59 (9.01) 7.23/5.59 (11.83/ 9.01)
4th speed 8.58 (13.83) 11.27/8.57 (18.16/13.83)
5th speed 14.30 (23.07) 14.30/10.9 (23.07/17.60)
Transmission ratio
for reduction 4.2762
Reduced speeds:
1st speed 0.63 (1.02) 0.82/0.63 (1.33/1.02)
2nd speed 0.94 (1.52) 1.22/0.94 (1.98/1.52)
3rd speed 1.30 (2.11) 1.71/1.30 (2.77/2.11)
Ath speed 2.00 (3.24) 2.63/2.00 (4.25/3.24)
5th speed 3.35 (5.40) 3.35/2.55 (5.40/4.11)
Reverse speeds:
Road speed 3.51 (5.67) 4.61/3.51 (7.44/5.67)
Reduced speed 0.82 (1.33) 1.07/0.82 (1.74/1.33)
Steering System Unilateral, ball-type
(when a trouble occurs not
to disassemble it)
13
Brakes
Foot brakes Double pedal hydraulic control
Hand brake Band-type mechanical control
FTO Drive PTO standard revolutions:
540 RPM at 2000 engine RPM
1000 RPM at 2050 engine RPM
PTO dependent
revolutions on the
shifted-in speed Tractor not Tractor provided
(through the provided with with a torque
gear box) torque multiplier multiplier
at the 1st speed 250.4 RPM 328.8 RPM
at the 2nd speed 372.7 RPM 489.2 RPM
at the 3rd speed 519.3 RPM 681.2 RPM
at the 4th speed 797.2 RPM 1046.6 RPM
at the 5th speed 1331.6 RPM 1331.6 RPM
at the reverse speed -326.8 RPM -439.2 RPM
Hydraulic Power Lift
Operating pressure 1707 Ibs./sq. in. (120 kp/sq. ст)
Pump capacity 4.4 imp. galls/min. (20 litres/min.)
Lift at hydraulic
power lift ball joints 3749 165. (1700 Кр)
(31.5” — 800 mm)
Electrical Equipment
Storage battery 12 V
Dynamo 12 V/12 AMP
Voltage regulating
relay 12 V/12 AMP
Starter 12 V/4 HP
Tyre Sizes Z 5711 Z 5718 Z 5745 Z 5748
Front tyre standard 6.50-16 9.5] 9-24
Front tyre — optional 7.50-16 8.3/ 8-24
Rear tyre standard 14.9/13-28 16.9/14-28
Rear tyre — optional 16.9/14-28 14.9/13-28
16.9/14-30 16.9/14-30
12,4/11-36 12.4/11-36
12.4/11-32
14
Main Dimensions and Weights
(of tractors provided with standard tyres)
Z 5711 Z 5718 Z 5745 Z 5748
Overall length
(without suspension
linkage) 139” (3520 mm) 139” (3520 mm)
Overall width
(at rear wheel track
of 56” = 1425 mm) 717 (1790 mm) 717 (1790 mm)
Height of the 64” 69” 65” 70”
steering wheel (1630mm) (1745mm) (1660mm) 1775 mm)
Ground clearance 17” (440 mm) 13” (342 mm)
Height of the
swinging bar 12.6” (395 mm) 16.77 (425 mm)
Wheel base 81” (2247 тт) 87” (2200 тт)
Front wheel track — 507—54”7—69” 58” (1480 mm)
adjustable (1280-1375-1750 mm) (rigid)
Rear wheel track —
adjustable per 2.95”
(75 mm) 56”—71” (1425—1800 тт)
Height of the 307 32” 29” 327
centre of gravity (758 тит) (812 mm) (747 mm) (812 mm)
Front axle ballast
weights in total 353 Ibs. (160 Ка)
Rear wheel ballast 618155. 461ibs. 618lbs. 461 lbs.
weights (280kg) (210kg) (280kg) (210 kg)
Water in rear tyres 661 lbs. (300 kg) 970 Ibs. (440 kg)
Minimum weight of
travel ready tractor
provided with hydraulic
power lift 5622 Ibs. 6084 165. 5996 Ibs. 6459 |bs.
(2550 kg) (2760 kg) (2720 kg) (2930 kg)
of which front 2006 165. 2094 lbs. 2402 Ibs. 2512 ibs.
axle load (910 kp) (950 kp) (1090 kp) (1140 kp)
of which rear 3616 Ibs. 3990 Ibs. 3594 Ibs. 3947 Ibs,
axle load (1640 kp) (1810 kp) (1630 kp) (1790 kp)
Maximum tractor weight
including hydraulic
power lift, front axle
ballast weights,
rear wheels 6591 lbs. 6899 Ibs. 6965 Ibs. 7274 |bs.
ballast weights (2990 kg) (3130 kg) (3160 kg) (3300 kg)
of which front 2380 165. 2424 165. 2589 165. 2788 Ibs.
axle load (1080 kp) (1100 kp) (1175 kp) (1265 kp)
of which rear 4211 Ibs. 4475 Ibs. 4376 lbs. 4486 lbs,
axle load (1910 kp) (2030 kp) (1985 kp) (2053 kp)
15
Z 5711 Z 5718 Z 5745 Z 5748
Overall height of
the tractor (up to 76” 96” 78” 97”
exhaust top) (1940mm) (2435mm) (1970mm) (2465mm)
Admissible load
of the front axle 2424 Ibs. (1100 kp) 3306 Ibs. (1500 kp)
of the rear axle 6922 Ibs. (3140 кр) 7055 165. (3200 Кр)
Tractor Power
Traction power of the |
tractor in suspension 4849 Ibs. 5070 Ibs. 5180 Ibs. 5511 Ibs.
(2200 kp) (2300 kp) (2350 kp) (2500 kp)
16
SPECIFICATIONS
Tractor
Engine Model
Type
No. of Cylinders
Bore
Stroke
Compression Ratio
Qutput Class
Cylinder Liners
Nominal Revolutions
Injector Timing
Injection Nozzles
Engine Weight
without Accessories
Cooling System
Oil Pump
Oil Cleaner
Fill up Data:
Engine oil sump
Injection pump
Air cleaner
Gearbox
— on flat ground
— in terrain
Portals
Steering box
Front driven axle
housing
Front wheels planet
reduction gears
Power assisting
steering device tank
Z 6711 Z 6718 26745 Z 6748
Z 6701
Diesel, 4 strokes with direkt fuel
injection
4
3.94” (100 mm)
4.33” (110 mm)
17.0 : 1
60—65 HP
Wet, separate for each cylinder
2200 RPM
21° + 1° before TDC
DOP 160S 625—4343
892 Ibs. (405 kg)
Forced circulation water cooling with
thermoregulator
Geared
Centrifugal, full flow type
2.64 imp. galls {12 litres)
0.04 imp. galls (0.2 litre)
0.28 imp. galls (1.3 litre)
3.5 imp. galls 3.94 imp. galls
(25 litres) (27 litres)
7 imp. galls 7.50 imp. galls
(32 litres) (34 litres)
0.84 imp. galls = 2X0.42
(3.8 litres = 2X1.9)
0.42 imp. galls (1.9 litre)
1.54 imp. galls (7 litres)
20.22 imp. galls
(2X1 litre)
0.88 imp. galls (4 litres)
17
Fuel tank 17.4 imp.galls 15 imp.galls 17.4 imp. galls 15 imp.galls
(79 litres) (67 litres) (79 litres) (67 litres)
Cooling system 2.86 imp. galls (13 litres)
Brake liquid vessel 0.04 imp. galls (0.2 litre)
Steering damper tank — — 0.13 imp. galls
(0.6 litre)
Clutch Double acting, power assisted (it is
possible to install the clutch with in-
dependent hand operated disengage-
ment of the PTO)
Gearbox 10 speeds forward: 5 road and 5 re-
duced ones, 2 reverse speeds: 1 road
and 1 reduced one
(4th and 5th speeds synchronized —
optional only)
The tractor can also be provided with
a torque multiplier as an optional
equipment which doubles the number
of speeds
Speeds of the 14.9/13-28 14.9/13-28
tractor provided Tractor not Tractor provided
with tyres provided with with a torque
torque multiplier multiplier
т. р. h. (km/h) m. p. h. (km/h)
Road speeds:
1st speed 2.70 (4.35) 3.54] 2.70 (5.70/ 4.35)
2nd speed 4.00 (6.47) 5.26/ 4.00 (8.49/ 6.47)
3rd speed 5.52 (9.01) 7.23/ 5.59 (11.83/ 9.01)
4th speed 8.57 (13.83) 11.27/ 8.57 (18.16/13.83)
5th speed 14.30 (23.07) 14.30/10.90 (23.07/17.60)
Transmission ratio
for reduction 4,2762
Reduced speeds:
1st speed 0.63 (1.02) 0.82/0.63 (1.33/1.02)
2nd speed 0.94 (1.52) 1.22/0.94 (1.98/1.52)
3rd speed 1.30 (2.11) 1.71/1.30 (2.77/2.11)
4th speed 2.00 (3.24) 2.63/2.00 (4.25/3.24)
5th speed 3.35 (5.40) 3.35/2.55 (5.40/4.11)
Reverse speeds:
Road speed 3.51 (5.67) 4.61/3.51 (7.44/5.67)
Reduced speed 0.82 (1.33) 1.07/0.82 (1.74/1.33)
18
Steering System
Brakes
Foot brakes
Hand brake
PTO Drive
PTO dependent
revolutions on the
shifted-in speed
Unilateral, ball-type
(when a trouble occurs not to
disassemble it)
Double pedal hydraulic control
Band-type mechanical control
PTO standard revolutions:
540 RPM at 2000 engine RPM
1000 RPM at 2050 engine RPM
Tractor provided — Tractor provided
(through the with no torque with a torque -
gear-box) multiplier multiplier
at the 1st speed 250.4 RPM 328.8 RPM
at the 2nd speed 372.7 RPM 489.2 RPM
at the 3rd speed 519.3 RPM 681.2 RPM
at the 4th speed 797.2 RPM 1046.6 RPM
at the 5th speed 1331.6 RPM 1331.6 RPM
at the reverse speed -326.8 RPM -439.2 RPM
Hydraulic Power Lift
Operating pressure
Pump capacity
Lift at ball joints
1707 lbs./sq. in. (120 kp/sq. cm)
4.4 imp. galls/min. (20 litres/min.)
3749 Ibs. (1700 kp)
Electrical Equipment
Storage battery 12 Y
Dynamo 12 V/12 AMP
Regulating relay 12 V/12 AMP
Starter 12 V/4 HP
Tyre Sizes
Front tyre — standard 7.50-16 11.2/10-24
Front tyre — optional 6.50-16 —
Rear tyre — standard 14.9/13-28 16.9/14-28
Rear tyre — optional 16.9/14-28 16.9/14-30
16.9/14-30 12.4/11-36
12.4/11-36
19
Main Dimensions and Weights
(of tractor provided with standard tyres)
Z 6711 Z6718 Z 6745 7 6748
Overall length
(without suspension 139” 139” 139” 139”
linkage) (3520mm) (3520mm) (3520 mm) (3520mm)
Overall width (at |
rear wheel track 717 71” 72” 72”
of 56” = 1425 mm) (1790mm) (1790mm) (1820 mm) (1820mm)
Height of the 647 769” 65” 70”
steering wheel (1635mm) (1750mm) (1665mm) (1780mm)
Ground clearance 13” 13” 14” 14”
(330mm) (330mm) (355mm) (355mm)
Height of the 16” 16” 17” 17”
swinging bar (395mm) (395mm) (425mm) (425mm)
Wheel base 81” 81” 80” 80”
(2247 тт) (2247 тт) (2220гпт) (2220тт)
Front wheel track 36” —65"—71” 59”
— adjustable (1430—1655—1805mm) (151 Omm)-rigid
Rear wheel track
adjustable per 2.95” 567 —71” 567 —71”
(75 mm) (1425—1800 mm) (1425—1800 mm)
Height of the 30” 32” 35” 36”
centre of gravity (765mm) (826mm) (899mm) (923mm)
Front axle ballast 353 lbs. in total 353 Ibs. in total
weights (160 kg) (160 kg)
Rear wheels ballast 618 Ibs. 463lbs. 618 Ibs. 463 lbs.
weights (280 kg) (210kg) (280 kg) (210 kg)
Water in rear tyres 662 lbs. 6621bs. 9701bs. 970 lbs.
(300 kg) (300kg) (440 kg) (440 kg)
Maximum weight
of travel
ready tractor pro-
vided with hydrau- 5775 lbs. 6238 lbs. 6636 (bs. 7100 Ibs,
lic power lift (2620 kg) (2830 kg) (3010 kg) (3220 kg)
of which front 2094 Ibs. 2204 lbs, 2865 Ibs. 2975 lbs.
axle load (950 kp) (1000 kp) (1300 kp) (1350 kp)
of which rear axle 3681 Ibs. 4034 Ibs. 3771 lbs, 4125 Ibs.
load (1670 kp) (1830 kp) (1710 kp) (1870 kp)
Maximum tractor
weight together
with hydraulic
power lift, front
axle ballast weights,
rear wheels ballast
weights but without 6746 Ibs. 7053 Ibs. 7604 lbs. 7913 lbs.
water in tyres (3060 kg) (3200 kg) (3450 kg) (3590 kg)
20
26711 Z 6718 26745 Z 6748
of which front 2424 Ibs. 2556 lbs. 3261 lbs, 3372 lbs.
axle load (1110 kp) (1160 kp) (1480 kp) (1530 kp)
of which rear 4322 Ibs. 4497 lbs, 4343 lbs, 4541 Ibs,
axle load (1950 kp) (2040 kp) (1970 kp) (2060 kp)
Overall height
of the tractor 75” 96” 76” 97”
(up to exhaust top) (1910mm) (2455mm) (1923mm) (2475mm)
Tractor Power
Traction power of
the tractor in 5070 165. 5400 165. 6062 lbs. 5952 lbs.
suspension (2300 kp) (2450 kp) (2750 kp) (2700 kp)
Main Specifications of the Power Assisted Steering Device
valid also for Z 5711, Z 5718, Z 5745, Z 5748
1. Cylinder
Cylinder inner diameter 1.96” (50 mm)
Length at shifted/in
piston rod 23.07” (586 mm)
Length at shifted/out
piston rod 34.88” (836 mm)
Maximum operating
pressure 1138 PSI (80 kg/sq. cm)
2 Pump
Maximum input 3.5 HP
Operating liquid at
the surroundings tem-
perature of 414° up to
1 140° F (—10° up to +60°C) ON 3
At the surroundings
temperature of —40° up to
—+50° F (—40° up to +10° C) ON 1
Maximum operating
pressure 1138 PSI (80 kg/sq. cm)
Range of revolutions 250 up to 1200 RPM
Delivery of pressure
oil ON 3 at the temperature
of 68° + 9° F (20° + 5° C)
and the pressure of
1138 PSI (80 kg/sq. cm)
at 1200 RPM of the pump 2.2 imp.galls/min.(10 litres/min).
21
3. Tank
Filling capacity
22
2.4 imp. galls (11 litres)
(proper filling of the power
assisted steering device
— 0.88 imp. galls or 4 litres)
SOMETHING ABOUT THE TRACTOR
Dash board (Fig.
1.
1, 2)
Switch box with key
Key fully inserted
position 0 —
position 1 —
position 2 —
position 3 —
starting circuit, charging circuit and its
pilot lamp are switched on
contour (side) and parking lights as well
as tail lights and illumination of instru-
ments are on
high beam, high beam pilot lamp, tail
lights, illumination of instruments and
side lights are on
dipped lights, tail lights, illumination of
instruments and side lights are on
Is the key only half inserted, circuits of position 1, 2 or
3 can be switched on,
MT
23
2, Dashboard illumination switch
switching on is carried out when drawing the button
sligtly up.
3. Push button of the starter.
4. Trafficator switch with electric horn push button — the
right-hand or left-hand trafficator is switched on by
turning the lever to the right or to the left; by de-
pressing the button the horn is operated.
5. Qil pressure gauge (for Z 6711, Z 6718, Z 6745, Z 6748
only) — correct oil pressure ranges from 43—71 PSI
(3—5 kg/sq. cm) at the temperature of 176° F (80° С).
Lubrication pilot lamp (Z 4712, Z 4718, 7 5711—7 5748)
— red — if it is on during the tractor performance, it
means a trouble in the lubrication system.
Fig. 2
24
10.
11.
12,
13,
14,
15.
Water thermometer
performance water temperature of the engine should
range from 176°—203° F (80°—95° C), the radiator
over-pressure plug opens the cooling circuit at 223 to
233 °F (106°—111° C) automatically.
Engine hour counter with speed indicator with the en-
gine running at 1600 constant RPM, one hour, the en-
gine hour counter indicates one engine-hour.
Air pressure gauge
performance pressure of the air is 82.5—85.35 PSI (5.8
to 6 kg/sq. cm).
Ammeter (on Z 5748, Z 6711, Z 6718, Z 6745 and
Z 6748 only). Charging pilot lamp (on Z 4712, Z 4718,
Z 5711—Z 5745) is red; if it is on during the perfor-
mance of the tractor, it means some trouble in charg-
ing system.
Hand operated accelerator — the fuel dose gets in-
creased when displacing the control lever rearwards.
Speed shifting lever.
Socket for the lamp for mounting purposes.
Switch of the headlamp for night work.
Fuse box.
Radiator blind.
Pedals and levers
1.
2.
Travel clutch pedal (Fig. 3/1).
Hand controlled disengagement of the PTO clutch
(Fig. 3/2)
lower position — PTO clutch is engaged
upper position — PTO clutch is disengaged
Clutch disengagement by hand can be carried out for
a short period only. There is a left-hand shitfing lever,
placed on the gearbox cover which serves for perma-
nent disengagement of the PTO (Fig. 4/4).
Torque multiplier control pedal (Fig. 3/3)
(on Z 5711—Z 5748 and Z 6711—Z 6748 tractors only).
Both the PTO and hydraulic power lift control lever
(Fig. 4/4)
a) hydraulic power lift — control lever down, 2nd posi-
tion — lowermost (hydraulic power lift put into ope-
ration but without the PTO, which does not rotate),
25
5.
DA.
26
Fig. 3
b) PTO together with hydraulic power lift into operat-
ion — control lever down — 1st position,
c) neutral position,
d) PTO put into operation through the gearbox — con-
trol lever up; PTO revolutions depend on the en-
gaged speed.
Reduced and road speeds control lever (Fig. 4/5)
a) up — road speeds
b) centre — neutral position
c) down — reduced speeds
Front axle drive control lever (Fig. 3/5A)
a) up — engagement
b) down disengagement
27
6. PTO revolutions control lever (Fig. 4/6)
(on Z 5711--Z 5748 and Z 6711—Z 6748 tractors only).
control lever displaced forwards/in the sense of the
tractor travel — neutral position;
control lever displaced to the left — 540 RPM of the
PTO
control lever displaced to the right — 1000 RPM of
the PTO.
IMPORTANT
When changing PTO exchangeable end pieces (Fig. 5/11)
from 540 RPM (1000 RPM) to 1000 RPM (540 RPM) and
vice versa it is necessary to put the PTO revolutions control
lever in its neutral position and only then change the PTO
end part. This operation being carried out, 1000 RPM
(540 RPM) can be engaged again.
Fig. 6
28
7. Foot brake pedals are connected by means of a catch
(Fig. 5/7).
8. Accelerator pedal (Fig. 5/8).
. 9. Differential lock pedal (Fig 5/9).
10. Hand brake control lever (Fig. 5/10)
bottom position — unbraked
top position — braked
Both hydraulic and pressure air system control levers
1. Hydraulic power lift remote circuit control lever
(Fig. 6/1).
2. Hydraulic power lift inner circuit control lever
(Fig. 6/2).
3. Hydraulic power lift selector lever (Fig. 6/3) can be dis-
29
placed in three positions according to the selected
regulation system:
— draft control
— mixed control
— position control.
Hydraulic power lift response lever (Fig. 6/4).
5. Oil cleaner magnetic plug of the hydraulic power lift
(Fig. 6/5).
Compressor control lever (Fig. 7/6).
Compressor engagement should be carried out at mi-
nimum engine revolutions, at the simultaneous lock lift-
ed upwards and lever engaged in the sense toward
radiator.
Lock (Fig. 7/7).
30
Fig. 8
Filling and Draining Orifices
1.
YU 5 UN
Coolant filling orifice in the radiator (Fig. 10/1).
NOTE: In the winter season, when the cooling system
is not filled up with antifreeze solution, water
must be drained by means of taps situated on
the crankcase as well as on the radiator bottom
part.
Fuel filling orifice (Fig. 8/2).
Water drain tap from the radiator (Fig. 10/3).
Water drain tap from crankcase (Fig. 8/4).
Oil filling and draining orifice of the steering box is
situated on the left-hand top part of the gear-box un-
der the fuel tank.
Fig. 9
31
10.
11.
13.
Draining bolt of oil from the gearbox is situated in
the gearbox bottom part between the front and rear
cover.
Oil filling orifice of the injection pump and governor
(Fig. 7/8).
Engine oil filling orifice (Fig. 7/14) of Z 4712 and
Z 4718 tractors, (Fig. 8/14) of Z 5711—Z 5748 and
Z 6711—Z 6748 tractors.
Oil draining hole of the injection pump and governor
(Fig. 7/9). |
Engine oil drain bolt (Fig. 7/10).
Oil dipstick for checking of the oil level in the engine
sump (Fig. 7/11).
Oil filling orifice of the gearbox and main transmission
housing (Fig. 5/12).
Oil dipstick for checking of the oil level in the gearbox
and the main transmission housing (Fig. 5/13).
32
a LL q y =
14,
15.
17.
18.
20.
21.
22,
mani
Fig. 11
Rear half-axle oil filling hole (Fig. 9/14).
Rear half-axle oil draining hole (Fig. 9/15).
. Brake liquid filling orifice (Fig. 8/16).
Power assisted steering device oil filling orifice
(Fig. 10/2).
Front driven axle oil filling orifice (Fig. 10/4).
Draining orifice for oil from the front driven axle is
situated on the front driven axle housing bottom part.
Oil tilling and draining orifice of double joint are si-
tuated on the top and bottom part of the RH and LH
joint of the Z 5745 and Z 5748 tractor.
Oil tilling orifice of reducers (Fig. 11/3).
Qil draining orifice of reducers (Fig. 11/5).
33
LU OO
AN Ce] [oi 077) (71
a= E = a A
Fig. 12
Bleeding of the Fuel System (Fig. 12)
1. Open the fuel tap on the fuel tank in order to fill up the
precleaner glass bowl 1 with fuel free of air bubbles.
2. Loosen a bolt of fuel filters 2 and operate manually the
fuel delivery pump until fuel flows out from both cleaners
free of any air bubble. Tighten the fuel cleaner bolt and
keep on pumping manually for a short period.
3. Loosen the bleeding screw 3 situated on the fuel inject-
ion pump and pump manually until fuel escapes around
the screw free of any air bubble. Keep on pumping and
tighten the bleeding screw gradually on the fuel in-
jection pump. The bleeding being finished, clean up
the engine soiled with the fuel.
34
A A
A
Ke
©
A.
e
3
‚ що во |
Ки SRE HE Dy E
o
©
o
>
A
N
Fig. 13
"Ce o
Li dea E
pm aro: >
Driver's Seat (Fig. 13)
The seat is duly springy and its position can be changed
according to the weight and size of the driver's body. The
distance of the seat from the steering wheel is changeable
by loosening nuts 1 placed on the base plate 2 and by
displacing the seat either forwards or rearwards as well.
Driver's Seat “AEROLASTIC” (Fig. 14)
The seat is pneumatically springy. The pressure in the dia-
phragme can increase according to the driver's weight up
to 35.6 PSI (2.5 kg/sq. cm) as a maximum. The seat is
adjustable in its longitudinal axis from its central position
of 3” (75 mm) forwards or rearwards. Better comfort of the
driver is assured with introduction of adjustable rests for
hands and a back rest as well.
Driver's mate's seat is situated on the driver's left-hand
side. On Z 4718 tractor model the mate's seat is situated
behind the driver.
ELECTRICAL EQUIPMENT AND ACCESSORIES
Storage Battery
During the tractor travel the storage battery is charged
automatically. If the current consumption is higher that the
D. C. generator is capable to deliver, it is necessary io
charge the battery outside the tractor from time to time.
Water gets evaporated during the charging process and
the electrolyte density increases. Therefore it is necessary
to dilute the electrolyte by topping up with distilled water.
Never apply ordinary water even if it looks like to be clean
— the storage battery could be damaged. Electrolyte with
a specified density of 1.28—1.285, i. e. 32° Bé is used for
filling the storage battery only in such a case when it has
been spilled. If the storage battery is supplied from the
Manufacturer's empty and uncharged, it must undergo the
so called first charge in strict accordance with instructions
of the Manufacturer,
Attendance
Check every week or every fortnight (according to the
athmosphere temperature) whether the electrolyte reaches
36
0.59” (15 mm) above the plates upper border. If the sto-
rage battery is not used for a longer period it should be
charged and attended once for 4 or 6 weeks. If the storage
battery is to be put out operation for a longer period, it is
recommended to have stored it in a specialized repairshop.
Terminals of the storage battery should be cleaned up from
time to time and sediments caused by evaporation of the
cells removed too. The life of a storage battery will be ex-
tended if it will be charged and attended in a specialized
repairshop after its each 3 months operation. The storage
battery should be protected against frosts during the win-
ter season as a discharged battery freezes particularly easy.
IMPORTANT: Please follow instructions of the Manufacturer
of storage batteries at all the time.
Starter Motor
Maintenance of the starter motor is limited to regular in-
spections, during which the following principles should be
respected:
1. The input cable terminals should be tightened well and
protected against corrosion with a thin coating of vase-
line to avoid their corrosion. Damaged cables should be
replaced by new ones.
2. Check collector, carbon brushes and brush holding
springs once for six months.
3. Have the starter tested in a specialized repairshop once
o year.
Voltage Regulating Relay
It the function of the voltage regulating relay had been
disturbed have remedy the trouble in a specialized repair-
shop. Any inexpert intervention can lead not only to the
destruction of the relay but also to serious damage of
further electrical accessories.
37
How to Prepare the Tractor for Travelling
Before starting to operate with the tractor check daily:
1.
Condition of the steering system — steering linkage
unions, tightening of bolts and nuts, steering wheel
dead course.
. Water level in the radiator; replenish with soft (rainy)
water free of sediments. Apply non freezing coolant
during the winter season.
. Fuel level in the tank — replenish if necessary. If the
fuel level sinks to the bottom or if you have forgotten
to open the fuel tap when starting the engine, it is ne-
cessary to bleed the fuel system and the whole injection
unit as well.
. Brake fluid level in the compensating jar — if the fluid
level sinks, replenish the jar (maximum level — up to
the top margin of the Manufacturer's trade mark PAL:
minimum level — top margin of the metallic holder).
5. Oil level of the engine oil sump.
6. Tightening of important joints — bolts, screws, nuts
particularly those of disks and wheel lugs).
7. Brakes — if some resistance is felt when depressing
latched and unlatched pedals.
8. Condition of the electrical system — inspect lamps,
lights, trafficators ets., replace defective bulbs or fuses.
9. Pressure in tyres — inflate fully if necessary.
10. When the tractor started to travel check the brakes
efficiency (both the hand and foot brakes). Brake pe-
dals must be latched.
How to Start the Engine
Before starting the engine make sure that the speed gear
shifting levers as well as those of auxiliary drives are in
their neutral positions and that the hand brake is on.
Then
38
— insert the key into the switch box in its “0”
position (the key should be fully inserted),
— depress the clutch pedal,
— open the fuel throttle to its maximum,
— depress the starter button.
IMPORTANT: Do not start longer than for 5 seconds. If
the engine fails to start immediately for the first time,
repeate starting after 30 seconds only, particularly in the
winter season. Do never help stopping the engine by means
of the starter. Wait until the engine stops completely, other-
wise the starter could be damaged.
If necessary, especially in the winter season, depress the
fuel overcharge button (Fig. 12/5) at simultaneous dis-
placement of the accelerator hand control lever for full
fuel supply.
How to Start the Engine in the Winter Season
It is advisable to preheat the engine at first by means of
hot water in the season of lower temperature in such a way
that lukewarm flows out from the crankcase drain tap.
Starting should be carried out at disengaged travel clutch
after having driven fuel through the fuel system pumping
manually with the fuel delivery pump situated on the fuel
injection pump. Excess starting fuel dose is automatically
added when the accelerator hand control lever is displaced
in its position for full fuel dose at stillstood engine and
the fuel overcharge button placed on the fuel injection
pump is simultaneously depressed.
When the engine starts to run it is advisable to let it run
at higher revolutions and covered radiator with its blind
until the engine gets warmed up a little. Before the ther-
mometer placed on the dashboard does not indicate a
temperature of 113° F (45° C), accelerate slowly and do
not go over 1800 RPM of the engine. (The engine warm-
ing-up is faster and more economical when the tractor
travels than at idle run of the engine and stopped tractor.)
How to Start to Travel with the Tractor
Inspect air pressure on the air pressure gauge when trai-
ler or similar transport means is coupled to the tractor
(minimum air pressure at the moment the tractor starts
to travel should reach 64 PSI or 4.5 kg/sq. cm).
1. Select road or reduced speed.
2. Reduce the engine RPM down to idle run and depress
the clutch pedal completely.
3. Engage the first speed by means of the shifting lever
placed under the steering wheel at its RH side.
39
4. Let up slowly the clutch pedal when simultaneously de-
pressing the accelerator pedal thus augmenting engine
revolutions.
5. When changing lower speeds by higher ones (e. g. the
second speed by the 3rd one), first depress the clutch
pedal and simultaneously displace the speed shifting
lever in its neutral position. Engage the clutch again,
disengage it once more, shift in a higher speed en-
gaging slowly the clutch again,
Speed change from a higher to a lower one should be car-
ried out with intergas; reduce the engine RPM, disengage
the clutch, shift off the previous higher speed, engage
the clutch, augment engine RPM (according to the instan-
taneous travel speed of the tractor) disengage the clutch,
insert a lower speed and engage slowly the clutch at con-
tinuously increase of engine revolutions.
Reduced speeds should be shifted in by means of the
same shifting lever as applied for road speeds.
If the tractor stands on a flat ground, release the hand
brake, engage the clutch slowly and augment engine re-
volutions in such a way that a smooth start of the tractor
is enabled. If the tractor stands on a slope, release the
hand brake at simultaneous engagement of the clutch and
increase of engine revolutions.
How to Drive the Tractor
1. Having started the engine but before commencing to
travel with the tractor, warm up the engine to its suf-
ficient performance temperature (warming up the en-
gine when driving the tractor under a small load is
quicker and more economical).
2. Start to travel continuously without useless delays on
lower speeds.
3. When running up a slope shift in the necessary lower
speed in time,
4. When travelling down a longer steep hill or slope, shift
in the lower speed the steeper is the slope. This lower
speed should be shifted in still before starting to run
down the slope (do not overturn the engine).
5. During the tractor travel should be followed:
— oil pressure pilot lamp
— air pressure gauge (correct air pressure ranges from
82 to 85.35 PSI or 5.8 to 6 kg/sq. cm), if the com-
pressor is in operation,
40
— charging pilot lamp (ammeter)
— water thermometer — most convenient engine per-
formance temperature is 176°—203° F or 80°—95° C.
If the temperature is lower as referred, cover the
radiator with the blind.
Engine hours counter indicates the speeds of the tractor
with shifted-in 5th gear, including revolutions and the num-
ber of the tractor service hours at running engine. Traf-
ficator pilot lamp (green), high beam pilot lamp (blue —
it is on when high beam is on, too), charging circuit pilot
lamp as well as the lubrication pilot lamp are red. At
higher revolutions both the charging circuit and lubrication
pilot lamps are off. If they are on, a trouble is signalized.
6.
When a trailer, provided with pneumatic brakes, is
coupled with the tractor, check before starting to
travel, if the compressor operates, if the minimum air
pressure is 64 PSI (45 kg/sq. cm), if pneumatic brakes
function is all right, if the trailer is hitched safely and
if trailer lights are in order.
When transporting attached implements be means of
the hydraulic power lift, lock the hydraulic power lift
inner circuit,control lever in its position “UP”. Before
descending from the tractor on. the ground, lower the
attached implements down to the ground at first.
The travel speed of the tractor loaded with attached
implements should correspond with the structure of
such implements.
It is prohibited to drive a tractor on the road with
unlatched brake pedals,
Before starting to work with the tractor on a slopy
terrain, consider well all possibilities of the work in
order to prevent any dangerous inclination of the
tractor.
When applying the tractor to loosen a stuck vehicle,
proceed very carefully in order to prevent any accident.
Do never use the tractor for pushing other vehicles or
trailers with the aid of a bar or plank introduced be-
tween the tractor and the pushed object.
Do not carry out any maintenance work on the tractor
with the running engine except when checking brakes
efficiency and charging of batteries.
41
16.
Do not open quickly the overpressure radiator plug
when the engine is overheated and do not pour cold
water into the radiator in such a case. It is always
necessary to suspend the overpressure by turning the
plug to the half open position.
The articulated shaft for driving agricultural machines
should be provided with a safeguard. Do never des-
cend from the tractor unless the articulated shaft is
disengaged.
No more than in the technical certificate specified
number of persons can be transported in the driver's
cab only.
Do never drive the tractor downhill without an en-
gaged speed.
Do never use the differential lock driving the tractor
in a curve.
Broken down cab safety frame (repaired after a break-
down eventually) should no longer be installed and
used on the tractor from safety reasons.
Running-in of the Tractor
1.
Drive the tractor neither with any machines or load nor
with engaged auxiliary drives for approximately 10 first
performance hours,
Do not load tractor during its next 20 performance
hours more than to its half output and do not work
with the tractor ot full engine revolutions. Use such
implements only which do not overload the tractor (e. 9.
sowing machines, harrows, drags, weeders, etc).
Do not load the tractor more than to its 3/, output
during its following next 20 performance hours (i. e. 50
engine hours). Do not apply the hydraulic power lift
during the running-in period of the tractor.
Each 50 engine hours change the oil in the engine and
in the injection pump.
Each 200 engine hours change the oil in gearbox and
portals,
42
HYDRAULIC EQUIPMENT OF THE TRACTOR (Fig. 6)
The geared pump of the hydraulic system of the tractor is
housed in the space of the main transmission housing. lt
is possible to select following controls by means of the
selector control lever:
(a) draft control
(b) mixed control
(c) position control
to (a) With the draft control engaged ,the attached im-
plement is automatically held in the position which
corresponds approximately with the same traction
power of the bottom drawbars of the three point
linkage.
to (b) With mixed control engaged, a combination of po-
sition and draft control is carried out.
to (c) With position control engaged, the attached imple-
ment is automatically held in the position which cor-
responds with the position of the control lever,
The Inner Circuit Control Lever controls
(a) lifting and lowering of implements,
(b) heights setting-up of the three point linkage at the
position control,
(c) traction power setting-up of the draft or mixed control
eventually,
(d) floating position setting-up (for work carried out with
implements equipped with their own sustaining wheel).
The Remote Circuit Control Lever
By means of this lever the feed of the pressure oil into the
remote circuit outlets, provided with quick couplings, and
back in the tractor, is controlled. Following positions can
be selected in this case:
(a) lifting (single or double acting cylinder)
(b) stop position (neutral)
(c) locked floating position — the lever remains in its
position (lowering at the single acting cylinder)
(d) forced lowering (double acting cylinder).
The control mechanism is provided with labels containing
inscriptions of above mentioned functions and respective
positions of individual control levers.
43
BRAKES
The foot brakes are controlled hydraulically by means of
two pedals (both the LH and RH wheel can be braked
separately). Braking action both of the left-hand and the
right-hand wheel is governed by means of a pressure com-
pensator (equalizer). When driving the tractor on the road,
brake pedals must be latched. The hand brake serves to
keep standing the tractor. It is put into operation when
moving the control lever upwards (toward the driver). Re-
leasing of the control lever should be carried out in such
a way that moving it upwards slightly at first (toward the
operator), depress simultaneously its button and return it
back in its lower position (the tractor is unbraked).
Differential Lock (Fig. 5/9)
If one of the tractor rear wheels spins in the terrain, apply
the differential lock (which puts the differential out of
operation so that both the rear wheels keep the same
revolutions but during the time of depressed lock pedal
only).
IMPORTANT: Differential lock should never be applied
when driving the tractor in a curve.
FRONT AXLE
Extensions with wheels can be springy or solid. in both
cases it is possible to change the tractor front wheel track
to 567—65“—71” i. e. 1430—1655—1805 mm (basic front
wheel track adjusted at Manufacturer's is 56” or 1430 mm)
for Z 6711 — Z 6718 tractors. The front wheel track of
Z 4712, Z 4718, Z 5711—Z 5718 tractors makes 1280—1375
—1750 тт ¡. e, 50”—54”—69” (the basic front Wheel track
set up by the Manufacturer is 54” or 1375 mm).
The change of the front wheel track (Fig. 15) should be
carried out in the following way:
1. Put a jack under the front axle and lift same,
2. Unscrew nuts (Fig. 15/1) from bolts of the front axle
extensions and remove the bolts,
3. Unscrew the nut from the steering system interconnect-
ing rod and draw it slightly out.
4. Pull out a little both extensions (Fig. 15/2) untill the
required wheel track is attained and lock them again
with bolts and nuts,
44
5.
6.
Screw on and lock the bolt in the steering system in-
terconnecting rod.
Check the front wheel toe-in (see page 73).
The change of the springy extension in a solid one can be
carried out by fitting in a stop (valid for Z 5711, Z 5718,
Z 6711 and Z 6718 tractors only).
This change should be done in the following way:
1.
Unscrew four screws from the covering lids situated on
the extension body and remove the lids (Fig. 5/3).
Check if there is a spline in the locking coupling po-
sitioned exactly against the hole of the extension body
and adjust this correct position eventually by depressing
or lifting slightly the axle.
Slide the locking inserts in holes of the extension body
— the milled part must fit into the spline of the locking
coupling.
Put elastic inserts (rubber rolls) in cavities of locking
inserts,
Reinstall covering lids with their packing on the exten-
sion body and tighten them with screw (it is necessary
to overcome the resistance of elastic inserts).
Fig. 15
45
When removing locking inserts apply the plug from the
filling orifice for their taking off as the lug can be screwed
in the inner thread of the locking insert.
Front wheel track of the four wheel drive front axle remains
permanently unchanged — it makes 1480 mm = 58” on
Z 5745 and Z 5748 tractors and 1510 mm — 59.5” on
Z 6745 and Z 6748 tractors. These tractors are not provided
with vertically adjustable extensions.
46
Rear Wheels — provided with standard type of tyres
The rear wheel track can be adjusted in six (seven) dif-
ferent positions in the range of 56” —71” (1425—1800 тт)
(on Z 4712 and Z 4718 tractors in the range of 537 —71”
or 1350—1800 mm). The change of the track should be
carried out at slightly lifted tractor rear axle only and in
such a way that wheels could rotate freely. Before lifting
the tractor rear axle, front wheels should be blocked thus
avoiding to move the tractor. Adjustment of individual
tracks is carried out by changing rims and disks.
Screws should be tightened well.
Screws joining the disk to the wheel rim should be tighten-
ed by 86.5—93.9 lbs. ft. (12—13 kpm) as well as nuts
joining the disc with shaft by 267-—288 lbs. ft. (37—40 kpm).
47
Tyre Inflating
Inflating Carrying Capa-
Tyre Size in PSI city of One Tyre Kind of Work
(Ка/59. ст) in Ibs. (kgs)*
6,00-16 35.50 (2.5)
1146 ( 520) Field labour, transport
9,5/9-32 28.44 (2.0) 2205 (1000) Field labour, transport
12,4/11-28 21.33 (1.5) 2723 (1235) Field labour, transport
6,50-16 35.50 (2.5) 1301 ( 590) Field labour, transport
42.66 (3.0) 1367 ( 620) work with industrial units
53.32 (3.75) 2734 (1240) at maximum travel speed
of 3% m. p. h. (6 km/h.)
1654 ( 750) Field labour, transport
35.50 (2.5)
44.08 (3.1) 3308 (1500) work with industrial units
at maximum travel speed
of 3% m. p. h. (6 km/h.)
9,5/9-24 28.44 (2.0) 2017 ( 915) Field labour, transport
35.50 (2.5) 3024 (1372) work with industrial units
at maximum travel speed
of 3% m. p. h. (6 km/h.)
8,3/8-24 28.44 (2.0) 1598 ( 725) Field labour, transport
35.50 (2.5) 2396 (1087) work with industrial units
at maximum travel speed
of 3% m. p. h. (6 km/h.)
2959 (1345) Field labour
3694 (1675) Transport
14,9/13-28 14.22 (1.0)
21,33 (1.5)
16,9/14-28 14.22 (1.0) 3352 (1520) Field labour
21.33 (1.5) 4224 (1920) Transport
16,9/14-30 15.64 (1.1) 3804 (1775) Field labour
21.33 (1.5) 4685 (2125) Transport
12,4/11-36 14.22 (1.0) 2387 (1085) Field labour
21.33 (1.5) 3025 (1375) Transport
12,4/11-32 14,22 (1.0) 2266 (1030) Field labour
21.33 (1.5) 2871 (1305) Transport
A. 11 1 1;
*) The carrying capacity of tyres can be exploited only up to the
value admissible for the load capacity of axles mentioned under
basic tractor specifications.
The carrying capacity of rear tyres can be increased of
20 % at maximum travel speed of the tractor of 12.4 m. ph.
(20 km/h.). But it is not allowed to pass over the value of
the permited pressure force of the axle.
48
Tyre Inflating
Tractors are provided with a tyre inflator which belongs to
the tractor standard equipment. If the tractor is equipped
with pneumatic brakes or with a torque multiplier, a com-
bined pressure regulator is installed in the tractor thus
fulfilling the function of the pressure equalizer, tyre inflater
and the safety valve as well. When inflating tyres, unscrew
the butterfly nut from the combined pressure regulator
screwing a hose for tyre inflating on its place. This hose
should be duly screwed in till its last thread in order to
depress the non-return valve. The tyre cannot be inflated
in the moment of opened release valve of the combined
pressure regulator but only at the moment when the pres-
sure in the pneumatic system drops bellow 82.5 PSI (5.8
kg/sq. cm) and the release valve is closed. When the tyre
is inflated, screw the butterfly nut back in its place again,
Rims
Wheel rims for both the rear and front wheels are of Wide
Base type. When changing tyres the same size of Barum
factory should be applied. When employing tyre casings of
foreign trade marks, only such types can be used, rolling
radius of which correspond with specificated Czech tyre
sizes. Both the front (of Z 5745, Z 5748, Z 6745, Z 6748
tractors) and rear wheels are delivered with valves for water
filling of tyres,
How to Fill Tyres with Water
An increase of tractor adhesion and its traction force can
also be obtained by filling the inner tubes of tyres with
water. Although it is possible to fill tyres with water also
by means of normal valve, the inner tubes are provided with
a special valve for this purpose which facilitates speedy
and easy filling. It is recommended to use an antifreeze
agent for filling tyres during the winter season.
Filling Technique
Apply a vessel or gravity tank for tyre filling. Ease the tyre
by means of a filling jack and turn it so that the valve
faces upwards. Deflate the air completely. Connect the
valve with the tank containing the solution by means of
a hose and pump the solution into the inner tube. Than
inflate the tyre to the specified pressure.
49
Draining Technique
Caution — water squirts out when unscrewing the valve
air section. A vacuum can be caused in the tyre when
draining water from it and therefore it is necessary to turn
the wheel slightly from time to time so that the valve comes
into its upper position. Screw on the bottom valve section
the water valve body and the inner tube valve air section
on it. Inflate the inner tube with air untill water stops flow-
ing out through the tube of the body. After emptying all
the water from the inner tube, screw off the water valve.
SPECIAL ACCESSORIES
Tractors referred in this manual can be equipped with fol-
lowing optional accessories:
Air Cleaner with Paper Cartridge
Maintenance of this air cleaner is mentioned on the label
sticked on the cleaner itself.
Hand Operated Disengagement of the PTO Clutch
(See Fig. 3/2). It serves for independent disengagement of
the PTO drive. In its disengaged position the control lever
is blocked by means of a safety lock. When torque multi-
plier is installed in the tractor, hand operated disengage-
ment of the PTO clutch carries out simultaneously the dis-
engagement of the tractor travel.
Torque Multiplier
(Only for Z 5711 — Z 5748, Z 6711 — Z 6748 tractors). This
equipment enables practically shifting-in of transmission of
1.31 under load. Thus 20 forwards and 4 reverse speeds can
be obtained. Both the engagement and disengagement of
the torque multiplier is carried out wihout any disengage-
ment of the clutch so that no wheel drive is set off ¡. e, no
interruption of the engine power transmission on the
tractor rear wheels is caused,
IMPORTANT:
(a) at engaged torque multiplier the tractor does not brake
by means of the engine,
(b) at engaged torque multiplier the tractor travel must
50
be disengaged by means of the hand operated control
lever only (Fig. 3/2),
(c) when employing the torque multiplier the compressor
should work permanently.
Synchronizing Clutch
(For Z 5711 — Z 5748, Z 6711 — Z 6748 tractors only.) It
can be installed on both the 4th and 5th speed gear, thus
assuring a noiseless shifting-in of the 4th and 5th speed.
Front Driven Axle (Fig. 10, 11) of Four Wheel Drive Tractors
(On Z 5745, Z 5748, Z 6745, Z 6748 tractors.) This axle
is wobbling at maximum swing of +15°. It is driven from
the drive box by means of the protected articulated joint
shaft. The drive is distributed on both front half-axles by
means of the differential gear. The attendance of four
wheel drive Z 5745, Z 5748, Z 6745 and Z 6748 tractors
differs from that of basic tractor types by front wheel drive
only.
The front wheel drive is controlled from driver's seat by
means of an engagement lever, placed on at the left-hand
gearbox side (Fig. 3/5A). The shifting in of the drive is
carried out by means of a gear clutch. When displacing
the engagement control lever upwards and getting dropped
the catch into the slot of the floor, the shifting-in spring,
which engages automatically the front wheel drive during
the tractor travel, will be pre-loaded. Shifting-out the catch
and displacing the control lever downwards cause the front
wheel drive disengagement. Both the engagement and dis-
engagement of the front wheel drive can be carried out
during the tractor travel without any disengagement of the
travel clutch,
Power Assisted Steering Mechanism (Fig. 18)
This equipment makes the tractor steering easier as it re-
duces the force on the steering wheel which is needed for
steering of wheels especially when travelling in the terrain
or employing agricultural or industrial units. It simultane-
ously damps schocks of steered wheels. The power assisted
steering mechanism works only in the case when the engine
is running. When the engine does not work the tractor can
be steered by force of the driver executed on the steering
wheel by means of the mechanical transmission only.
51
IMPORTANT: When turning the steering wheel up to its
stop, it should be than turned a little back.
There are not adjustable stops in the steering
box and from this reason when levers bear
against stops on the front axle, the driver has
still the possibility to turn the steering wheel
a little thus enabling to displace the slide
valve in the cylinder. This situation causes
a strain of the whole steering mechanism by
maximum force of the device for power assis-
ted steering (220 Ibs./100 kps/approximately)
and oil is warmed up very quickly so that the
pump could be damaged. A similar situation
occurs when the tractor travels in a deep
furrow groove and the driver tries to get the
tractor out of it by turning wheels aside by
means of the device for power assisted steer-
ing and he does not succeed. Thus the slide
valve is displaced causing excess strain of
the steering mechanism, too; from this reason
it is necessary to turn back the steering wheel
in its original position after 30 seconds at the
latest.
The power assisted steering device consists of
1. a cylinder with slide valve distribution (Fig. 18/1)
2. a pump (Fig. 18/2)
3. a tank and accessories (Fig. 18/3)
4. high pressure hoses (Fig. 18/4)
Three Point Linkage (Fig. 19)
The three point linkage consists of bottom links, vertical
links and the upper link. The vertical links are fitted by
their ball joints on lifting arms outer pins. Both links have
the possibility to alter continuously their length. Maximum
adjustable length is 4” (100 mm).
53
Trailer Coupling (Fig. 20)
The trailer coupling is fitted into the bracket fork, the
bracket being fixed by bolts to the main transmission hous-
ing rear wall and interconnected with a pin which is locked
by means of a mechanical lock. The trailer coupling is
adjustable vertically in three positions. The pin dia is 1.5”
(38 mm).
Fig. 21
54
Multistage Suspension Linkage (Fig. 21)
This equipment serves for coupling trailers. It is vertically
adjustable in four positions and without the fixed and
swinging bar, in seven positions. Permissible vertical static
load is maximum 2860 Ibs. (1300 kps) for Z 6711 — 7 6748
tractors, 2646 lbs. (1200 kps) for Z 5711 — Z 5748 tractors
and 2205 Ibs. (1000 kps) for Z 4712 — Z 4718 tractors.
PTO for 540 RPM and 1000 RPM
Design | (Fig. 5)
Engagement of PTO respective revolution number can be
carried out at stillstanding engine only. The PTO end piece
for 540 RPM is six-splined, that for 1000 RPM with involute
profile is twenty-one-splined.
At Manufacturer's Works tractor are provided with six-
-splined PTO end piece 540 RPM. When changing the PTO
piece it is necessary to remove the cover at first, to unscrew
the plug and the screw with which the PTO end piece is
fixed to the adapted PTO end. Now the PTO end piece
can be slid off the PTO and replaced by another end piece
provided with 21 splines and determined for a drive at 1000
RPM. The new end piece must be taken off from the guide
on the gearbox cover at first; the end piece is safeguarded
with a control lever (Fig. 5/11) which can be removed very
easily from the PTO end piece splines. In order to facilitate
sliding off of the end piece from the guiding it is necessary
that the control lever and thus also the end piece are in
their central i. e. neutral position. The PTO end piece, pro-
vided with six splines and removed from the PTO end
should be inserted in the guide situated on the gearbox
cover in the reverse way. The locking device of the locking
mechanism allows to turn the control lever in the only
sense according to the applied PTO end piece. The PTO
end piece for 540 RPM is engaged by means of the PTO
piece for 1000 RPM fitted in the control lever and vice
versa,
Design |! (Fig. 4/6)
PTO is provided with a six-splined profile only but it is
possible to engage 540 RPM (control lever to the left) or
1000 RPM (control lever to the right).
A tractor equipped in such a way allows to choose follow-
ing alternatives:
When displacing the control lever (Fig. 4/4) in its position |,
55
the hydraulic power lift pump is put into operation only;
this pump rotates according to the selected system either
by 540 RPM or 1000 RPM,
When displacing the control lever from its position | into
the position Il, the geared coupling displaces in such a way
that not only the hydraulic power lift pump but also the
PTO are driven by selected RPM.
In N (neutral) position all functions are off. Position ill
assures PTO drive through the gearbox.
Positions |, II, N, lll — see label on the gearbox lid.
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56
Swinging Drawbar (Fig. 22)
The swinging bar consists of a bracket provided with a pin,
the bracket being bolted to the main transmission housing
bottom wall, and of the swinging drawbar itself. The swing-
ing drawbar can be adjusted in five positions horizontaliy
and fixed to the bar by means of two pins and safety pins.
Permissible vertical static load of the swinging drawbar
is maximum 1323 lbs. (600 kps).
Belt Pulley (Fig. 23)
The belt pulley serves for driving of stationary machines.
It is fixed on the PTO and its drive is carried out by
shifted in 5th speed but the reduction speed control lever
must be displaced in its neutral position and the PTO drive
control lever in its top position. By turning the belt pulley
through 180”, the clockwise sense is changed in the coun-
ter-clockwise one. In such a case it is necessary to install
the bleeding plug on the belt pulley body reverse side in
order to avoid oil leaking.
57
Front and Rear Ballast Weights (Fig. 24)
Serve for additional increase of tractor adhesion weight.
Fig. 24
58
Pneumatic Brakes (Fig. 25)
The pneumatic system consists of a compressor, combined
pressure equalizer, air container, brake valve, pressure
gauge, brake valve control carried out by means of the
brake pedal as well as by the hand brake, coupling head
and connecting pipes. The brake valve leverage, controlled
by means of the hand brake control lever, is set up in such
a way that the trailer is braked simultaneously with the
tractor. The operating pressure is set up to 85 PSI (6 kg/sq.
cm). When coupling the trailer with the tractor, the latter
must be immobilized by means of the hand brake that the
relief valve is not under the pressure. Is the tractor used
for transport, it is necessary to follow the air pressure
gauge placed on the dashboard. The Z 6748 tractors are
morever equipped with a warning device, that in case of
a lower pressure than the value of 3.9 kg/sq. cm causes
the intensive lightening of red pilot lamp situated on the
dashboard. Operate therefore the tractor with the trailer
only when the pressure is higher than 3.9 kg/sq. cm and
the warning pilot lamp lights only with a faint red light,
Suspension Linkage for Single-axle Trailer (Fig. 26)
Suspension linkage for single-axle trailer serves for auto-
matic coupling of these trailer to the tractor. lt is fitted
instead of the swinging drawbar on the central pin of the
final transmission housing and attached by chains to the
bottom links. The hitch setting-up in its operation position
is facilitated by a guiding bolted to the bracket. The hitch
together with the trailer beam are lifted by means of
hydraulic power lift arms and bottom links until the moment
when the hitch fits in arms where it should be locked by
means of a pin and a lock. When uncoupling the trailer
from the tractor, the hitch together with the trailer beam
should be lifted a little by means of the hydraulic power
lift and unlocked by deviation of the control lever in the
direction from the driver rearwards. Only then the lowering
can follow. Permissible maximum vertical static load of the
suspension linkage for the single-axle trailer is 2860 lbs.
(1300 kps) for Z 6711—Z 6748 tractors, 2645 lbs. (1200 kps)
for Z 5711—Z 5748 tractors and 2205 lbs. (1000 kps) for
Z 4712—Z 4718 tractor. The diameter of the trailer beam
eye for the hitch is 27 (50 mm).
59
Fig. 26
Driver's Cab (Fig. 24, 27)
The driver's cab is provided with a safety frame which re-
presents the base of the whole cab. The cab is fixed to the
tractor body by means of silentblocks which reduce essen-
tially vibrations in the cab inner space. The cab is glazed
with safety glass.
IMPORTANT: A repaired cab after an accident (or a cab
attacked considerably by corrosion) should be
no more mounted on the tractor,
Hot Air Heating of the Cab (Fig. 24/1)
in order to improve the driver's work conditions, Zetor trac-
tors are provided with hot air heating equipment which
output is 8.730 B. Th. U. approximately (2200 kcal/h.).
Hot air is supplied in the cab by means of a flexible hose
from the air collector top part.
60
=x
SUN
ESTE
DELI
The driver of the tractor provided with hot air heating
equipment should follow during its performance particularly:
(a) engine temperature
(b) amount of the coolant
(c) and keep the cooling system in good conditions
(d) if the surroundings temperature is higher than 59°F
(15°C) do not employ antifreezing solution for the
cooling system
(e) the heating equipment collector should be removed
from the tractor when the surroundings temperature
attains more than 59°F (+ 15° CQ).
Front Mudguards (Fig. 24)
Front mudguards can be fitted on wheels at all front wheel
track ranges except of that of 50.5” (1280 mm).
Headlamp for Night Labours
This equipment is fitted on the rear right-hand mudguard;
it is switched on by means of a switch (Fig. 1/13).
61
Couplings Elements
1. Quick couplings (Fig. 28/1).
2. Head for coupling the trailer hose from the brake air
container (Fig. 28/3).
3. Socket for trailer lightening (Fig. 28/2).
62
MAINTENANCE AND ADJUSTMENT
Maintenance of tractors is one of the most important ope-
rations. Maintenance which is carried out in due time and
correctly ensures trouble-free tractor performance. If there
are no sufficient experiences and good technical equipment
of the repairshop it is better to have carried out all ne-
cessary maintenance in a specialized worskhop.
Average fuel consumption is 0.9—1.3 galls/h. (4.5—6
litres/h.). All following instructions should be carefully ob-
served.
Daily Attendance (to be carried out each 8--10 hours)
1. Clean both the tractor and implements.
2. Replenish fuel and inspect for tightness joints of the
fuel system.
3. Check water level and inspect for tightness joints of
the cooling system.
4. Check oil level and inspect for tightness joints of the
lubricating system.
5. Check oil level in the air cleaner and clean pre-filter
removing dust from it. When installing the air filter
VICP 250 (provided with a paper cartridge) on the
tractor as optional equipment — see maintenance in-
structions for it written on a label sticked on the air
filter.
6. Check function both of the foot and hand brake and
air pressure indicated by the air pressure gauge. Check
pneumatic brakes system for tightness and brake ef-
ficiency of the tractor coupled with a trailer.
7. Inspect if electrical system is all right lights, direction
indicator etc. Check at running engine regular run,
correct lubrication and charging.
8. Check air pressure both in the front and rear tyres,
screw on caps and tighten them well.
9. Check brake liquid level in the vessel and fluid brakes
for tightness. Drain oil from the tyre inflator.
10. Check bolts, screws and nuts of steering system linkage
if tightened well.
11. Check if DC generator and water pump V-belt is
tightened correctly.
12. Inspect oil level in the tank of the device for power
assisted steering.
63
13.
Check trailer state and both of the coupling and lock-
ing elements before starting to drive with trailers or
semi-trailers.
When starting to employ the hydraulic power lift un-
screw the magnetic oil cleaner from its housing (Fig.
6/5) after a short period of the hydraulic power lift
performance. Rinse and blow off the screen and clean
the magnet. Amount of impurities in the air cleaner
depends on the performance period of the hydraulic
power lifting equipment therefore it is recommended to
inspect and clean the magnetic oil filter after some
10—100 service hours during the starting period of
working of the hydraulic power lift.
Check each 30—50 engine hours the oil level in the inject-
ion pump,
Technical Inspection 1 (TI 1)
This inspection should be carried out after 110 galis. (500
litres) of fuel consumption or after 100 engine hours of the
tractor performance.
All
15.
16.
17.
18.
19.
20.
64
operations 1—14 should be carried out at first.
Check oil in the crankcase oil sump and clean the
centrifugal oil cleaner drum rotor (oil cleaner at 7 4712
tractor).
Inspect oil level in portals.
Inspect oil level in the gearbox.
Inspect oil level in the steering damper tank.
Unscrew the butterfly nut from the air cleaner, remove
the cover and check the state of the sedimentation
bowl. Untie three bottom quick couplings and remove
the complete precleaner upwards (empty the dust) and
complete air cleaner body downwards. Wash air clea-
ner jacket, cartridge, blade distributor and rebound
plate in petrol or gasoil and dry them before assembly.
Suction slots protecting strainer should also be clean.
Bolt parts with screw and nut together and put them
into the cleaner jacket filled up before with pure un-
used engine oil to the relative margine and fix the
body to the air cleaner cover. Lubricate contact surface
of the cover and sealing rubber ring with grease an
the cartridge neck.
Lubricate the water pump by turning the greasing
nipple through one turn and check fan belt sag —
maximum 0.6” (15 mm),
21. Oil clutch disengaged sleeve.
22. Lubricate front axle bracket, wheel extensions, disen-
gaging clutch shaft, pedals, RH strut, stirrup of the
draft control, struts — tension nuts, collar with steering
wheel small control lever by means of a greasing
nipple press.
23, Inspect the electrolyte level in the storage battery -—
which should reach 0.6” (15 mm) above the upper
border of plates. Clean corroded cable terminals.
24. Lubricate Bowden cable at braked tractor by means of
the hand brake with few drops of oil PP 80 (SAE 80).
25. Clean plug of power assisted steering tank.
26. Inspect oil level in the front axle housing and wheel
reducers as well (Z 5745, Z 5748, Z 6745, Z 6748 trac-
tors).
Technical Inspection 2 (TI 2)
The inspection should be carried out after 220 galls (1000
litres) fuel consumption or after 200 engine hours of the
tractor performance.
All operations 1—26 should be carried out at first.
27. Change oil in the crankcase oil sump, injection pump
body and governor.
28. Clean duly the centrifugal oil cleaner (at Z 4712 trac-
tor oil cleaner only).
29. Replace cartridge of the coarse fuel filter.
30. Check clearance between clutch disengaging levers
and the sleeve.
31. Inspect and if necessary, clean and set up the in-
jector,
Technical Inspections 3 (TI 3)
This inspection should be carried out after 660 galls. (3000
litres) of fuel consumption or after 600 engine hours of the
tractor performance.
All operations 1—31 should be carried out at first.
32. Replace the fine fuel filter cartridge.
33. Grease cab door pins.
65
34. Check valve clearance (have do it in a specialized
repairshop respectively) on the cold engine — intake
valve 0.008” (0.2 mm), exhaust valve 0.01” (0.3 mm).
35. Check front wheel toe-in and the play of front wheel
head taper roller bearings, replenish grease in front
Wheel heads.
36. Check and adjust hand brake if necessary.
37. Flush Cooling system under the Pressure of pure water
in order to remove sediments.
Technical Inspections 4 (TI 4)
To be carried out after 1320 galls (6000 litres) fuel con-
sumption or after 1200 engine hours of the tractor.
Operations 1—37 to be carried out at first.
38. Replenish oil in the steering box.
39. Change oil in portals,
40. Clean suction strainer of the oil pump.
41. Replace tyre inflator cartridge at the compressor.
42. Have checked tightness of injection pump elements in
a special workshops,
43. Change oil in the circuit of the device for power as-
sisted steering.
Current Repair (CR)
To be carried out after 2640 galls (12 000 litres) fuel con-
sumption or after 2400 engine hours of the tractor.
Operations 1—43 to be carried out at first,
44. Check or have repaired the steering wheel play ac-
cording to the steering wheel dead point position,
45. Check charging unit, check starter motor — in a spe-
cial repairshop.
46. Clean and rinse radiator with sodium solution,
47. Turn front wheel tyre casings with respect to one side
wear,
48. Have ground-in engine valves in a specialized work-
shop.
49. Change oil in the front driven axle housing as well
as in double joints and reducers housing.
66
Running-in of an Overhauled Tractor
To be carried out after 55 galls (250 litres) fuel consump-
tion or after 50 engine hours of the tractor performance.
Operations 1—14 to be carried out at first.
50. Check oil cleaner for tightness (and clean its rotor).
51. Drain oil from the crankcase oil sump and replenish
with new pure engine oil. Change oil in the injection
pump housing and governor box.
52. Change oil in the steering box.
33. Inspect connecting bolts for tightness:
— of the front bracket with the engine
— of the front axle with extensions
— of front and rear wheels nuts
— of beods of rear wheels and ballast weights,
54. Inspect oil level in the gearbox.
55. Check fan V-belt for tightness -— maximum sag of
0.6” (15 mm).
Technical Inspection 1 (TI 1)
Maintenance to be carried out after 110 galls (500 litres)
fuel consumption or after 100 engine hours of the tractor
performance,
Operations 1—26 to be carried out at first.
56. Check cylinder head stud nuts for tightness (tightening
torque 130—137 Ibs. ft. (18—19 kpm) — have done
in a specialized workshop.
57. Set up valve clearance (at a cold engine — intake
valve 0.008” (0.2 mm), exhaust one 0.01” (0.3 mm)
have carried out in a specialized workshop.
58. Clean fuel filters 1 and 2 (drain mud from jars).
Technical Inspection 2 (TI 2)
Maintenance to be carried out after 220 galls. (1000 litres)
fuel consumption or after 200 engine hours of the tractor.
Operations 1-—31 to be carried out at first.
59. Change oil in portals.
Change oil in gearbox, clean suction strainer of the
hydraulic power lift and inspect due function of the
shock absorber of the aerolastic seat.
67
Technical Inspection 3 (TI 3)
Maintenance to be carried out after 660 galls. (3000 litres)
fuel consumption or after 600 engine hours of the tractor,
Operations 1—37 to be carried out at first,
60. Change oil in the box of the device for power assisted
steering, in the gearbox and portals. Check oil in
steering box.
Overhaul
An overhaul of the tractor should be carried out after
4000—6000 engine hours of the tractor;
— if reliability of individual tractor parts can no longer be
assured and if the whole technical state of the tractor
jeopardizes safety performance of it,
— if very many tractor parts need to be repaired,
— if further tractor performance is no more economical,
68
MAINTENANCE INSTRUCTIONS
Qil filling for engine lubrication
Replenish oil in the crankcase oil sump till the top gauge
mark of the oil dipstick. Then start the engine and let it
run for 2—3 minutes at low RPM. After the oil level is
calmed again, check the oil level and top up the oil to the
upper gaugemark of the oil dipstick.
Oil should be always changed after the tractor travel is
finished while it is still warm. Unscrew first the magnetic
drain plug on the bottom crankcase cover. Clean the plug
removing caught metal particles.
Centrifugal Oil Cleaner
Cleaning of this oil cleaner should be carried out in the
following way: unscrew the butterfly nut, remove the cover,
take off the rotating part, unscrew nut M 32 and separate
rotating parts from themselves. Wash thoroughly inner and
bottom parts and reassemble them again. The gouge marks
stamped both on the top and bottom rotor parts should
face each other in order not to violate the dynamic equi-
librium of rotating parts. The lubrication pressure is mo-
nitored by the pressure gauge.
Oil Pump Suction Strainer cleaning
Drain old oil, remove the crankcase bottom cover, take off
the oil pump suction strainer and wash it in petrol or Die-
sel oil. Reinstall duly dried suction strainer back to the oil
pump, lock against loosening and fix the bottom cover
to the crankcase. Tighten well bottom bolts to prevent oil
leaking.
Injection Unit Lubrication (Fig. 7)
A plug serves for filling oil into the housing both of the
injection pump and output governor. A screw indicates the
oil level. For draining old oil from the housing serves a
plug situated on the bottom of the injection pump and
another plug on the output governor bottom. The engine
oil should be applied for lubrication both of the fuel inject-
ion pump and output governor. The specified period for oil
change in the engine oil sump should be profitted also for
oil change in the whole injection unit. Before taking the
69
tractor off its performance for a longer period, it is neces-
sary to drain oil from the injection unit no matter how
many miles the tractor covered.
Brakes
Check correct function of brakes and the brake fluid level
in the bowl which should always be full. The bowl is filled
at the Manufacturer's with SYNTHOL 190 HD brake fluid,
The brake fluid level should never be allowed to sink right
to the bottom, otherwise air would enter the brake system
and render the brakes inoperative. Observe perfect clean-
liness when replenishing the brake fluid, If reusing for top-
ping up the brake fluid caught during the bleeding operat-
ion, pour it into the bowel through a fine sieve or a clean
rag only. Water that penetrates into the brake fluid causes
corrosion of the inner metallic parts of the brake shoes
thus reducing the braking effect.
Brake System Bleeding
If some connecting pipe union had been removed or the
brake fluid had leaked and had been refilled, a perfect
bleeding operation of the brake system should be carried
out.
If you are not sufficiently experienced, have this work car.
ried out in a specialized repairshop,
Bleeding of the brake system should te carried out in the
following way:
Fill the bowl with brake fluid, Slip a rubber small hose
on the tapered end of the brake cylinder bleeding screw
and immerse the other end of it into the fluid contained
in the transparent bowl. Loosen the bleeding screw by
about two turns depress the relative brake pedal, thus driv-
ing out the brake fluid together with air bubbles. Keep on
depressing the brake pedal until only brake fluid free
of bubbles flows out. Depress finally the pedal and tighten
the bleeding screw. Make sure to have always sufficient
brake fluid in the bowl.
When bleeding, observe following instructions:
(a) brake fluid level in the bowl must be higher than the
orifice of the bleeding screw. Watch the fluid level in
the equalizing bowl,
70
(b) do not tighten the bleeding screw until the pedal is
fully depressed,
(c) during the bleeding operation, pedal should be de-
pressed quickly and released slowly,
(d) having finished the bleeeding operation, replenish the
brake fluid in the bowl and by depressing the unlatch-
ed pedals by a force of 132 lbs. (60 kg) approx. check
the tightness in joints.
IMPORTANT: Bleeding procedure should be carried out
with disconnecting pedals only.
Hand Brake
Unscrew the small bolt which fixes the brake band cover
and turn the cover aside. Pull the hand brake control lever
until it fits into the third tooth of the paw |. Leave the
control lever in this position, loosen the lock nut and tigh-
ten the brake band by means of the bottom nut on the
brake drum. Lock the adjusted band with the adjusting
nut, turn the brake band cover back in its position and
fix it with the small bolt. The same procedure should be
carried out also for the second brake band of the hand
brake. When the hand brake control lever is released the
bands on the brake drums are released in such a degree,
that during the tractor travel no harmful overheating of
brakes takes place. Check correct function of the brakes
as the last operation.
IMPORTANT: |
Before starting to adjust brake bands make sure that hand
brake band control lever pins are in their basic position
of the band bracket, It is also necessary that the hand
brake control lever placed on the gearbox cover is in its
unbraked position. In case that the pins are not in their
basic position of the band bracket, it is necessary to adjust
them by means of the adjusting nut placed on the brake
tie rod by its loosening or retightening. This adjustment
should be done in a specialized workshop.
Play Adjustment of Front Wheel Taper Roller Bearings
(Z 4712, Z 4718, Z 5711, Z 5718, Z 6711, / 6718 tractors)
This adjustment should be carried out at lifted front axle
in the following way:
1. Unscrew front wheel locking nut.
71
2. Remove cotter pin and tighten duly castellated nut.
3. Loosen it a little back in such a way that the next cut
of the castellated nut corresponds with some hole in
the pivot. The wheel has to rotate freely without any
play in this state, but ijt should not jam. The wheel
swing on the bearings is quite slight.
Pre-loading of bearings reduces considerable their life,
4. Lock nut by means of a split pin in this position and
screw on the front wheel locking nut.
Front Wheel Toe-in Adjustment:
1. Loosen counternuts of bath articulated heads of steer.
ing system connecting bar.
2. Set up specified front wheel toe-in when turning the
connecting bar central part — toe-in measured on
the rim side.
3. Tighten counternuis — upper surfaces of articulated
heads must be parallel.
72
Toe-in
ranges at Z 4712, Z 4718, Z 5711, Z 5718, Z 6711, Z 6718
tractors from .23”+.15” (6+4 mm).
ranges at Z 5745, Z 5748 tractors from .12” up to .19”
(3--5 m).
Divergency at Z 6745 and Z 6748 tractors between front
wheels is ‚46”—,59” (12—15 mm).
Steering System
is ball-type as a kind of nut and screw with the only steer-
ing bar arm at LH tractor side.
Power Assisted Steering Device
For the power assisted steering oil ON 3 for summer sea-
son and ON 1 for winter one should be applied -- amount
.88 galls (4 litres) approx.
Check oil level.
—
Inspect hoses and end-pieces.
NI
Observe oil change in summer and winter months.
La
Oil Quality Parameters (acc. ÉSN)
ON 1 ON 3
cinematic viskosity 29.5—45,2 not specified
(68° F c St = 20° C c St)
corresponds with °E 4—é6 approx.
cinematic viskosity not specified 21—29
(122° F c St == 50° C ¢ St)
corresponds with °E 3—4 approx.
minimum viskosity index 40 50
setting point —58° Е (—50° С) —13° Е (—25° С)
Belt Pulley
The belt pulley is provided with a plug for filling and drain-
ing oil. The same oil sort as for the gearbox should be ap-
plied. Amount: .2 galls (0.9 litre). Change oil each 2000
belt pulley performance hours. When employing belt pulley
permanently check and refill oil if necessary.
73
Maintenance and Attendance of Tyres
Due attention to the maintenance and care of tyres should
be paid. Correct tyre inflating is very important for them.
Insufficient inflation causes quick cracking of tyres sides
and danger of fissures in the texture. Excessive inflation of
tyres prevents normal bending of tyre sides so that the
runners are worn only in the centre. Incorrect front wheel
toe-in adjustment leads to considerable tyre wear (wheels
diverge or too converge). lrreqgular brake function causes
a shortening of tyre life. One of the greatest dangers of
tyre life is unskilled, unexpert and forcefull tyre fitting. Tyres
and rims are designed in such a way that no excessive
effort and force are needed for fitting them on the wheel.
Make sure that rims are always free from dirt and par-
ticularly from rust.
74
TROUBLES AND THEIR REMEDIES
Engine Troubles
It is not possible to start the engine
Cause: Remedy:
Fuel injection pump does not
supply fuel:
(a) fuel system bleeded
insufficiently bleed fuel system
(hb) fuel filters contaminated clean fuel filters or
excessively replace cartridge
Engine runs irregularly
(a) air in fuel line loosen cap nuts on
injectors and crank the
engine until Diesel oil
flows out free of air
bubbles
(b) some injector nozzle
is clogged inspect and clean it
(c) dirt on the delivery
valve seat remove and clean it
Engine output is insufficient
(a) some nozzle is seized check and replace the
or clogged nozzle if necessary
(b) injectors adjusted have adjusted in a spe-
uncorrectly cialized repairshop
(c) fuel injection pump have adjusted in a spe-
adjusted uncorrectly cialized repairshop
(d) insufficient compression
pressure in cylinders
which may be caused by:
1. untight valves regrind valves in their seats
2. uncorrectly set up set up the correct valve
valve play clearance
3. defective gasket be- replace the gasket
tween cylinder head
and the crankcase
75
Cause:
4. loosened cylinder head
stud bolts
5. baked piston rings
Remedy:
tighten to specified torque
release rings and clean
grooves in pistons
Engine gets overheated
(a) little water in radiator
(b) V-belt of the water pump
is slack
(с) radiator considerably
clogged with water
incrustation
replenish water in the
radiator
stretch out the V-belt
clean the radiator
Troubles of the Electrical Equipment
Insufficiently charged battery
Cause:
(a) D. C. generator drive
belt spins
(b) defective battery
(c) voltage regulating relay
is set up to low voltage
(d) defective D. C. generator
Remedy:
stretch the belt in order
to achieve maximum sag
of 1/5—1/7 (5—8 mm)
under the finger pressure
of 4.4 Ibs. (2 kps) approx.
test it
have it repaired in a
specialized repairshop
have it repaired in
a specialized repairshop
Excessively charged battery
(electrolyte boils and evaporates)
(a) short circuit in one
battery cell
(b) defective voltage
regulating relay
Starter does not work
Cause:
(a) connecting cables to the
starter motor are released
(b) worn carbon brushes
76
check battery and have
it repaired if necessary
have it repaired in a
specialized repairshop
Remedy:
tighten them
replace them by new ones
Cause: Remedy:
(c) carbon brush spring
broken replace it by a new one
(а) collector is soiled clean it
(e) defect in the electro- have it repaired in a
magnetic coil specialized repairshop
Slow run of the starter motor
insufficient voltage check and have charged
of the battery the battery
Troubles of Hydraulic Brakes
Brake pedal travel too long
Cause: Remedy:
insufficient amount
of brake fluid top the brake fluid bowl
Brake pedal travel too long,
pedals springy when depressing them
air in braking system bleed the braking system
Insufficient efficiency of the hand brake
too long travel adjust it
It is not possible to inflate tyre by means
of the combined pressure regulator
Remedy:
(a) screw in the hose for tyre inflating til its last thread
(b) let drop the pressure in the pneumatic system bellow
82.5 PSI (5.8 kg/sq. cm) in order to shut the release
valve of the combined pressure regulator
(c) have repaired the combined pressure regulator in a
specialized repairshop
Incorrect Function of the Power Assisted Steering Device
Cause: Remedy:
insutficient amount of oil replenish and bleed
in the tank the power assisted
steering system
77
Troubles of the Torque Multiplier
1.
*)
78
After having put in operation the torque multiplier
the speed of the tractor does not change; this trouble
is caused by:
(a) small air pressure in check pneumatic system
the air pressure tank for tightness
(b) incorrectly adjusted
clutch levers adjust them*)
After having put in operation the torque multiplier the
tractor power drops as the clutch slips; this trouble
Is caused by:
(a) incorrectly adjusted
clutch levers adjust them*)
How to set up clutch release levers
Disconnect the clutch pedal tie rod and remove the
clutch side На.
Adjust clutch release levers for tractor travel in such
a way that the disengaging sleeve clearance is .23”
(6 mm).
Set up clutch release levers for the power take off shaft
in the same way that the disengaging sleeve clearance
is .59” (15 mm).
Connect the clutch pedal and adjust the tie rod in such
a way that the set up clearance decreases to 157
(4 mm).
Operator's Manual for Zetor Tractors: |
4712, 4718, 5711, 5718, 5745, 5748, 6711, 6718, 6745, 6748
Edition: Il — 10000 — 1976
Publication No: 735 342 310 098
Published by:
Commercial and Technical Service Department
Section for Documentation and Publicity ZKL Brno
Czechoslovakia
Tisk 52 1177-76
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