SNAPPER TUFF TORQ K50/K55 hydrostatic transaxle SERVICE MANUAL

SNAPPER
TUFF TORQ MODEL K50/K55
HYDROSTATIC TRANSAXLE
SERVICE MANUAL
SNAI В ER McDonough, GA., 30253 U.S.A. MANUAL No. 07011 (1.R. 7/94)
TABLE OF CONTENTS
Section | - GENERAL INFORMATION , . . . ... o.oo ovens nnn 14-12
Section Il - TROUBLESHOOTING. .........eqeíoooccccoooo. 2122
Section Iil - TRANSAXLE REMOVAL FROM TRACTOR, _ . . . ........ 31-32
Section IV - TRANSAXLE DISASSEMBLY. ...................41-440
Section V - TRANSAXLE ASSEMBLY, . . ...........oo........5159
Section VI - TRANSAXLE INSTALLATION ,................... 61-63
Section VII - PREPARING TRANSAXLE FOROPERATION. . . . . . . ... .7.1-72
NOTE
When making repairs that require replacement parts or
components, use only original SNAPPER replacement
parts to keep the equipment in top operating condition.
Refer to the appropriate parts manual for correct part
numbers and proper quantities required.
© Copyright 1994 by SNAPPER. Any use of editorial or pictorial content, in any manner, without express, written consent is prohibited.
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GENERAL INFORMATION
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Section | - GENERAL INFORMATION
INTRODUCTION
HOW TO USE THIS MANUAL
This manual contains the Service and Maintenance infor-
mation required to properly inspect, service and repair
a SNAPPER TUFF TORQ Model K50/K55 Hydrostatic
Transaxle. The manual is divided into sections for quick,
easy reference. Carefully read all procedures described
for servicing a particular component BEFORE repairs are
started, to avoid needless disassembly.
WARNINGS & CAUTIONS
Details of standard workshop safety procedures are not
included in this manual. WARNING & CAUTIONS occur
where procedures, if improperly performed, could cause
personal injury and/or damage to the transaxle or its com-
ponents. These WARNINGS & CAUTIONS do not cover
all conceivable ways hazardous consequences could be
created by improperly following the instructions or by the
incorrect use of service tools.
TOOL REQUIREMENTS
The normal complement of Standard and Metric tools
found in most repair shops are all that will normally be
needed to repair the SNAPPER TUFF TORQ Model
K50/K55 Hydrostatic Transaxle.
12 ©
“= An.
TROUBLESHOOTING
2.1
Section Il - TROUBLESHOOTING
HYDROSTATIC TRANSAXLE
TRANSAXLE WILL NOT MOVE FORWARD OR IN REVERSE
Roll release leverisengaged. . . . . . . . . . .. . . ............., disengage lever
Oil level low. . . . . 2.2. 0 aaa aaa ea aaa add oil
Input drive belt is slipping or broken. . ............. 2... 2..2... adjust/replace belt
Parking brakeisset. . . . . . 2 aereo release park brake
Stripped splines on input shaft. . ........ ... LL LL LL LS replace input shaft
Stripped keysonaxles. . . . . . . eee replace axle keys
Broken axle orring gear. . . . . . . 2... aaa replace axle or ring gear
TRANSAXLE IS OVERHEATING
Oillevellow . . aer nene ne ne ne check/add oil
Oil is of wrong type. . . . ........ aaa aaa A LA A AS drain. replace with specified oil
Cooling fins on transaxle areclogged. . . . . .. e... 2.9.0 ri. clean fins
Broken cooling fan blades. . . . . 1... 224412411411 14 1 14 4 1 4 replace cooling fan
Exceeding load rating for tractor. . . . . . . . . . LL LL LL LS reduce load
Parking brake not fully released. . . . . . . .... . . . . . aa release park brake
LEAKING OIL |
..rom axle seals. . . . | ee ee aaa aaa aaa replace axle seals and/or bushings
..”“*om oil breather. ............ 2... ea overfilled. drain excess oil
FREEPLAY IN SHIFTER ARM
Shift blocks probably worn. . .... . e... . . . .check/replace shift blocks
2.2
A
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LEA
Section lll
TRANSAXLE REMOVAL FROM TRACTOR
3.1
LY
~ x
Tigran, +
a.
Section lll - TRANSAXLE REMOVAL FROM TRACTOR
DO NOT REMOVE!
TRANSAXLE REMOVAL А FACTORY-INSTALLED
PRESSURE FILL PLUG
NOTE: Er
The following information covers removal of the =
SNAPPER TUFF TORQ Model K50/K55 Hydrostatic - o —%
Transaxle from SNAPPER LAWN TRACTORS. e
=
Raise hood and disconnect spark plug wire.
Remove mower deck. See Operator's Manual. SEAL WASHER
Remove drain plug and seal washer from lower case. See DRAIN re |
Figure 3.1.
Allow oil to drain completely.
NOTE:
When reinstalling drain plug, use a new seal washer,
SNAPPER Part No. 9-1434, and torque drain plug to 20-
24 Nem (174-217 Ib-in).
Elevate rear of tractor and support frame with jack stands.
Remove and discard rear wheel hubcaps.
Remove rear wheels.
Disconnect brake linkage from brake arm, located under
the right rear frame. See Figure 3.2.
Remove tractor drive belt. Refer to Operator's Manual
for instructions.
Remove hairpin and washer and disconnect transaxle
speed control linkage from front of transaxle. See Figure
3.3.
Remove mounting bolts from transaxle and tractor frame.
Lower transaxle and remove deck cable bracket.
Remove transaxle for service.
Remove all tractor parts which are attached to the tran-
saxle. Refer to Section VI, Figure 6.1 for parts break-
down. |
Transaxle is now ready for repair.
3.2
RUE COTTER PIN
FIGURE 3.1
FLAT WASHER
BRAKE ARM
РЕ
BRAKE LINKAGE ——
1
\
FIGURE 3.2 I
TRANSAXLE SPEED _- 7
CONTROL LINKAGE ~~
.
и
© 7
Pe bea N
| В 45 В»
N 3
чи”
~
<<
N
!
|
WASHER |
HAIRPIN
FIGURE 3.3
x
" ur
x
Section IV
TRANSAXLE DISASSEMBLY
4.1
Section IV - TRANSAXLE DIS
VENT VALVE REMOVAL
Thoroughly clean outside surface of transmission.
Remove the vent valve cap.
Inspect condition of vent valve cap and body. Replace
either, if required. See Figure 4.1.
BRAKE INSPECTION
Check brake assembly components for worn or damaged
parts as follows:
1. Inspect the case at points (A) and (B) for signs of
contact with the brake disc. See Figure 4.2.
2. Inspect the inner edge of the mounting bracket at point
(C) for any wear caused by contact with the brake
lever.
NOTE:
If contact with the mounting bracket has caused any wear,
replace the brake lever, shoe, shims and disc.
BRAKE DISASSEMBLY
Remove the two cap screws.
Remove the brake lever mounting bracket, brake lever,
brake disc, brake shoe and shims. See Figure 4.3.
Inspect the splines on the output shaft and inside the brake
disc for chipped or broken teeth. Replace as required.
Inspect all components of the brake assembly for gen-
eral wear, cracks, scoring and rust. Clean or replace items
as required.
After cleaning or replacing components of brake assem-
bly, set them aside until final assembly.
ASSEMBLY
REMOVE VENT
VALVE CAP
INSPECT
FOR WEAR
|
INSPECT CASE ANTES
FORSIGNOF B | |
CONTACT WITH A N
BRAKE DISC \
N
vr “X NS À
FIGURE 4.2
BRAKE LEVER
go
1
BRAKE LEVER
MOUNTING BRACKET
FIGURE 4.3
4.2
Ka
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мой
Section IV - TRANSAXLE DISASSEMBLY
T
RANSAXLE HOUSING CASE SEPARATION
Remove seventeen capscrews to separate the transaxle
housing case. See Figure 4.4.
Separate the upper and lower halves of the housing case
by inserting a screwdriver between the halves at the five
REMOVE SEVENTEEN (17)
| 12mm CAPSCREWS FROM
CASE
(S) pry points and pry them apart. See Figure 4.5 - > 14 NE ч
7” —| ÁN DO NOT REMOVE!
a | == FACTORY-INSTALLED
remove any remaining gasket material from both case PRESSURE FILL-PLUG.
alves.
Carefully inspect components and case halves for obvi- FIGURE 4.4
ous damage.
PRY
POINT
Ay
a = =
ONO = e > | |
POINT в ==, >= MN NON KO - pry
== == Le UG \ | >> 2
Of tir Lx POINT
2 I “в, == | 9-0 ZO
KO PON vue AA Ta 2
(SN E uo
(O: КЗ | ~ = à =
NOA - 7 ==
SER 177 E
PRY Ww © `
POINT Y PRY
' POINT
FIGURE 4.5
MAGNET REMOVAL & CLEANING
Pull magnet out of slot in lower case half. See Figure 4.6. MAGNET
Clean magnet by blowing it with compressed air.
After cleaning, inspect the rubber seal around the mag- SLOT IN
net for splits and brittleness. If damaged, replace with a E CASE
new magnet assembly.
Set the magnet aside for final assembly.
FIGURE 4.6
Section IV - TRANSAXLE DISASSEMBLY
DIFFERENTIAL AXLE INSPECTION E
Check the differential axle assembly components as fol-
lows: Е
1. Inspect the ring gear for worn, broken or missing teeth.
See Figure 4.7. |
2. Check to make sure that the sides of the ring gear
have only floating contact with the walls of the case
half.
3. Check to see that the thrust plates are holding the
ring gear assembly in alignment.
4. Inspect the bevel gears for worn, broken or missing
teeth.
5. Check to make sure that the axle shafts are smooth.
6. Check to see that the differential bevel gears respond
instantly to movement of the axle shafts and bevel
gear splines.
7. Carefully inspect axle seals for leakage or damage.
NOTE:
If axle seals are not to be replaced, DO NOT remove dif-
ferential axle assembly. Complete removal of the axles
require the installation of new seals.
INSPECT
RING GEAR TEETH
THRUST PLATES
HOLDING
ASSEMBLY IN
ALIGNMENT
A
1
Li À,
RNE
>
ARN
CIN
|
Ye
(|
— SIDES OF
RING GEAR
SHOULD HAVE
"FLOATING" CONTACT
WITH CASE
INSPECT
BEVEL
0e: GEARS
E INSPECT
SEALS
eee
КЛ
||
ОЛ
ДУМУ
(UY
QU
|
INSPECT AXLE
SHAFTS
FIGURE 4.7
4.4
Section IV - TRANSAXLE DISASSEMBLY
DIFFERENTIAL AXLE REMOVAL}
NOTE:
Remove differential axle assembly BEFORE removing
pump and motor assembly. This sequence of removal
makes it easier to work on the pump - you do not have to
work around the ring gear.
Remove thrust washer from the "short axle" side. See
Figure 4.8.
Rotate the C-ring 180° in its slot so opening is facing down.
This will prevent the C-ring from dropping down into the
case. See Figure 4.9.
Hold the "short axle" bevel gear stationary as you slide
the axle outward to free the C-ring.
Remove C-ring from axle.
NOTE:
Do not remove axle at this point - it holds the bevel gear
in place while the long axle side is being disassembled.
Repeat above procedures for "long axle" side.
Hold differential axle assembly by both bevel gears and
slide axles clear.
Remove gear assembly. See Figure 4.10.
Remove axles.
Remove axle seals.
Inspect condition of axle bushings, then measure the in-
side diameter of each. The bushing ID should measure
NO LARGER than 19.2mm (0.76 inch) MAXIMUM! If the
bushings exceed specification, replace the upper case
housing - the bushings are not to be replaced.
Inspect all components of the ring gear and bevel gear
assemblies for signs of scoring, pitting, breakage or un-
due wear. Replace components as required.
GEAR, SHAFT & AXLE SPECIFICATIONS
Bevel gear ID - 15.11mm (0.06 inch) MAXIMUM
Cross-shaft OD - 14.96mm (0.589 inch) MINIMUM
Axle OD (Long & Short) - 19mm (0.748 inch) MINIMUM
4.5
THRUST WASHER
ROTATE C-RING
180° SO THAT
OPENING IS
FACING DOWN
"SHORT AXLE"
BEVEL GEAR
FIGURE 4.9
UPPER CASE
HOUSING
BEVE и СЕАВ
ASSEMBLY
FIGURE 4.10
“a mA
4
Section IV - TRANSAXLE DISASSEMBLY
Install new axle shaft seals. Protect the new seals from
damage by wrapping tape around the axle splines and C-
ring groove before installing axle. See Figure 4.11.
NOTE:
Lube inside lip of axle shaft seal with GP grease or 30 wt
motor oil before installing.
DISASSEMBLY OF TRANSPORT
(FREE-WHEELING) ASSEMBLY
LOWER CASE HALF
The transport actuating bracket and pin are located in the
lower case half. Inspect the case on the outside for oil
leakage around the pin, then check the bracket and pin
for signs of wear. If everything is in good condition, set
the lower case aside until final assembly. See Figure 4.12,
If any sign of oil leakage is visible on the outside of the
lower case half, the transport assembly must be removed
from the case and the O-ring on the pin replaced. See
Figure 4.13.
After removal, check the actuating bracket, pin and C-
ring for wear or damage. Replace components as re-
quired.
BRACKET
C-RING GROOVE
„”
TRANSPORT
ACTUATING
‘WRAP TAPE AROUND
SPLINES AND C-RING
GROOVE.
SPLINES REMOVE TAPE AFTER
INSTALLING AXLES THROUGH
NEW SEALS.
FIGURE 4.11
PIN
CASE HALF
FIGURE 4.12
ACTUATING
BRACKET
FIGURE 4.13
4.6
TT er
Section IV - TRANSAXLE DISASSEMBLY -
UPPER CASE HALF
Remove filter. See Figure 4.14.
Remove push-pins, springs and push-pin guides from
valve body. Inspect all parts for wear or damage. Re-
place as required.
Inspect transport valve bores and balls for wear or dam-
age.
If any wear or damage is found, install the brake disc on
the output shaft and rotate the disc in both directions to
force the valve bodies from the housing. See Figure 4.15.
NOTE:
Hold a cloth over valve bores to catch valve body assem-
‘blies as they are expelled.
If the valve assemblies are not expelled as the disc is
rotated back and forth, then remove the bleed port con-
nector plug (Figure 4.14) and blow compressed air through
the bleed port to eject valve assemblies. Swap locations
of bleed port connector and pump plug to eject opposite
valve assembly with compressed air.
If the compressed air does not eject the valve assem-
blies, carefully insert snap-ring pliers into the valve sleeves
and pull them out of the valve bores.
Check the bores for wear or damage. If required, replace
center block valve body.
Remove pump port plug and O-ring from valve body.
FILTER (REPLACE.
WITH NEW FILTER
DURING REASSEMBLY)
O — O-RING
BLEED PORT CONNECTOR
PLUG (REMOVE ONLY IF
NECESSARY TO DISLODGE
VALVE ASSEMBLY)
CENTER BLOCK
VALVE BODY
VALVE
7 (E),
«a OA
“= = PUMP & MOTOR
~~ a )
VALVE ZA
BORE
<
ASSEMBLY
SPRING
FIGURE 4.
(rf Dx
Joa 7 A
r
- PUSH-PIN —
14
ROTATE DISC
IN BOTH
DIRECTIONS
FIGURE 4.15
4.7
da
Section IV - TRANSAXLE DISASSEMBLY
SHIFTER SHAFT DISASSEMBLY SHIFTER
SHAFT
Using a feeler gauge, measure the gap between the edge BLOCKS O
of the swashplate slot and the shift blocks. The maxi- nT
mum allowable gap is 0.15mm (0.0059 inch). If the gap — e,
exceeds this dimension, replace both shift blocks. See TAS — =
Figure 4.16. Ad
SWASHPLATE
Remove shifter shaft and shift blocks. See Figure 4.17. SLOT >
Check end of shaft and mating surface in the case for |
signs of wear. Replace components as required. С N
Remove existing O-ring - a new one will be installed dur-
ing reassembly.
PUMP, MOTOR & CENTER BLOCK
DISASSEMBLY vila
| SHIFT
Before proceeding with the disassembly of the BLOCKS
pump, motor & center block, BE AWARE that |
they are assembled UNDER PRESSURE.
While disassembling, do not let these compo- MATING SURFACE
nents FLY APART as they could be damaged | FOR WEAR
beyond use.
Remove the bleed port connector (if it was not previously
removed in the "Transport (Free-Wheeling) Assembly
Disassembly"). See Figure 4.18.
| | FIGURE 4.17
Remove and discard the two O-rings. o.
O-RING —D
Hold down on the pump, motor and center block assem-
— PIPE mue Фо)
bly with one hand as you loosen and remove the three | |
capscrews and spacers with the other. See Figure 4.19. "
BLEED PORT o
CONNECTOR PORT PLUG
(REMOVED IN A
D PREVIOUS
DISASSEMBLY
0-RING—«<D PME
SN
CENTER ———"_7 7 EY
BLOCK A >
+ == &
À
FIGURE 4.18
4 8 / / 7
Section IV - TRANSAXLE DISASSEMBLY
While keeping downward pressure on the assembly with
one hand, grasp the disc brake* on the end of the output
shaft with the other. Now, reposition the hand holding
down on the assembly to where it is holding the pump
and center block position. Press in towards the disc brake
end. See Figure 4.20.
Move motor, pump and center block assembly to a work-
bench. Gradually release pressure on the components
and allow them to separate.
Leave these components for now; they will be inspected
and reassembled later.
REMOVAL OF PUMP SHAFT ASSEMBLY
Remove shaft seal. See Figure 4.21.
Remove snap ring.
Remove pump shaft assembly.
Inspect ball bearing for wear or damage.
If bearing is damaged, remove the snap rings and slide
the bearing off the shaft. See Figure 4.22.
Inspect shaft for damage. Replace as required.
PART NUMBERS
90-1438 SEAL, Input Shaft (1)
9-1435 SNAP-RING (1)
9-1458 SNAP-RING (2)
9-1459 BEARING, Ball (1)
9-1457 SHAFT, Pump Input (1)
* DISC BRAKE SHOULD HAVE BEEN PREVIOUSLY
INSTALLED ON END OF OUTPUT SHAFT DURING
THE DISASSEMBLY OF THE TRANSPORT (FREE-
WHEELING) ASSEMBLY.
REMOVE (3)
CAPSCREWS
& SPACERS
PRESS "IN" к
FROMBOTH €
— . ENDS
= SEAL
) SNAP RING
FIGURE 4.22
Section IV - TRANSAXLE DISASSEMBLY
SSEMBLY
PUMP 8: SWASHPLATE DISA
Shown in Figure 4.23 are the components of the pump
and swashplate assembly. Familiarize yourself with all
components and their order of assembly before proceed- | GD —
À. | REMOVED IN
e | DISASSEMBLY
. + OF PUMP
NOTE: a INPUT SHAFT
The components in Figure 4.23 are shown in their normal CASE
operating position: (i.e., "up"). Disassembly of these com-
ponents will take place with the upper case housing up-
side-down on the workbench. 1.
|
=n HOUSING
to
Separate, clean and inspect all components. Measure —
thrust bushings for minimum thickness - 1.3mm (0.05
inch). Inspect surfaces of all components individually -
they should be free of rust, pitting, scoring, etc. to be
serviceable. Replace parts as required.
° (СО) SWASHPLATE
iman > BUSHING
D— THRUST PLATE-TOP
Ca») SWASHPLATE
STAMPED "S" MUST —— CYLINDER BLOCK + BEARING
BE LOCATED AT TOP PISTON (5) CD) — TinusT PLare - Втм
| AFTER ASSEMBLY PUMP PISTON — —e Do |
HAS BEEN COMPLETED! WASHER (5)
a
e —— PUMP INPUT
. PISTON —|
SPRING (5)
. >
. SHAFT (REMOVED
> IN PREVIOUS
DISASSEMBLY
E
PISTON SPRING |
a)
| BLOCK
PUMP & MOTOR
CENTER BLOCK
CYLINDER
BLOCK MOTOR PUMP PISTON WASHER
SWASHPLATE
BEARING au CYLINDER BLOCK PISTON
MOTOR |
FIXED SWASHPLATE MOTOR OUTPUT SHAFT
HOUSING
BALL BEARING
Es
Fast
i,
e— PUMP CYLINDER
4.10 os
TRANSAXLE ASSEMBLY
5.1
Section V - TRANSAXLE ASSEMBLY |
ASSEMBLY & INSTALLATION
PUMP SHAFT ASSEMBLY
Coat all components with 10W-30 Class FSCD Motor Oil
before assembly.
Assemble components of pump shaft assembly and in-
stall it into the upper case. See Figure 5.1.
Secure the pump shaft into the upper case with the snap
ring.
Wrap tape around splines on end of shaft to protect seal.
Coat lip surfaces of seal with GP grease or motor oil be-
fore installation. Refer to Figure 5.1.
SWASHPLATE & SHIFTER SHAFT ASSEMBLY
Install thrust plates. See Figure 5.2.
Install a new O-ring on the shifter shaft.
Apply GP grease to inside of shaft blocks to help them
adhere to the shifter ball.
Fit the swashplate, shift blocks and shifter shaft together.
While holding these components together, fit them into
the upper case half. See Figure 5.3.
5.2
PUMP SHAFT
UPPER CASE
HOUSING
FIGURE 5.1
rms PLATES
FIGURE 5.3
Section V - TRANSAXLE ASSEMBLY |
PUMP ASSEMBLY
Install the thin thrust washer on the swashplate. See Fig-
ure 5.4.
Install ball bearing.
Install the thick thrust washer.
Inspect all components of the pump cylinder block to make
sure they are clean, then coat them lightly with motor oil
before assembling. See Figure 5.5.
To assemble pump cylinder block, place a spring in each
opening, then top each spring with a pump piston washer.
Insert the pump pistons into the cylinder block one at a
timw. Hold your fingers tightly between the pistons to
prevent them from dropping out of the cylinder block. See
Figure 5.6. Hold the cylinder block assembly firmly and
install it onto the pump shaft. Make sure that the splines
on the shaft and cylinder block are aligned, then slowly
release your hold on the cylinder block assembly.
PUMP MOTOR & DRIVE SHAFT ASSEMBLY
Install the bearings, snap ring and a new seal on the drive
shaft. See Figure 5.7.
NOTE:
Coat inside lip of seal with 30 WT. motor oil and wrap
spline-end of shaft with tape before installing seal.
Install the thin thrust washer into the opening of the fixed
swashplate. See Figure 5.8.
Lightly oil, then install, the bearing into the opening.
Install the thick thrust washer against the bearing.
WASHER
9-1469
Y#}— SWASHPLATE
* BEARING
9-1471 |
THIN THRUST
WASHER
FIGURE 5.4
PUMP
CYLINDER
BLOCK
| PISTON SPRING (5)
DS pam PISTON WASHER (5)
CYLINDER BLOCK PISTON (5)
FIGURE 5.5
HOLD FINGERS
BETWEEN
PISTONS TO
PREVENT. THEM
FROM FALLING
OUT OF CYLINDER
BLOCK
FIGURE 5.6
—5.3 ; :
Section V - TRANSAXLE ASSEMBLY
SNAP RING
Ÿ BEARING '
| (LARGE 1.0.)
BEARING
(SMALL 1.D.)
O Gra
\ >
FIGURE 5.7
Insert the drive shaft assembly through the hole in the
fixed swashplate as shown in Figure 5.9.
Coat the backside of the bronze pump and motor plates
with GP grease. See Figure 5.10.
With the bronze sides facing out, fit the bronze pump and
motor plates to the dowel pins on the center block. Press
plates firmly against center block after installation.
“S" IS ALWAYS
ON TOP!
FIXED
SWASHPLATE
THICK THRUST
WASHER
FIGURE 5.8
y- FIXED
SWASHPLATE
THRUST WASHERS
AND BEARING
DRIVE SHAFT
FIGURE 5.9
BRONZE
PUMP PLATE
CENTER
MOTOR PLATE
FIGURE 5.10
5.4
-
И y .
«, dt
doom
“
Section V - TRANSAXLE ASSEMBLY
PUMP, MOTOR & CENTER BLOCK
ASSEMBLY
Install the brake disc on the end of the drive shaft.
Carefully fit center block to motor cylinder block and drive
shaft assembly. Perform this step in a vertical position as
shown in Figure 5.11 - this will prevent the pistons from
falling out of the cylinder block.
Hold the center block and motor cylinder block with one
hand while pressing in on the brake disc with the other
hand.
Turn the assembly at a slight angle until the seal, ball
bearings and fixed swashplate (the thick portion, stamped
"R", will be facing up) are aligned with mating grooves in
the upper case half. See Figure 5.12.
Slowly seat the seal, ball bearings and swashplate into
their mating grooves. Atthe same time, adjust your hold-
ing pressure on the assembly to align the two center block
roll pins with their mating holes in the upper case half.
Make sure that the end of the pump shaft is aligned with
the center hole of the bronze pump plate as you seat the
assembly!
After pump shaft and roll pins have been located in their
holes, install two capscrews in roll pin holes and finger
tighten. See Figure 5.13.
Install spacer and capscrew into third hole. Finger tighten.
Check installation for alignment, then torque the three
capscrews to 391-520 in. Ib. (44-58 Nem).
MOTOR
CYLINDER
BLOCK
— PISTONS
CENTER
BLOCK ROLL
PIN (2)
& | Sent h
= NO
(es fe
1 u | [>
ROLL PIN HOLES (291557 LS
FIGURE 5.13
55 4 ©
de *
Section V - TRANSAXLE ASSEMBLY
DIFFERENTIAL AXLE ASSEMBLY
Lightly grease inside lip of new axle seal with GP grease
or 30 WT motor oil and install them flush with outside of
upper case lip. See Figure 5.14.
Wrap tape around splines and C-ring grooves on both
axles to protect new seals.
Install shafts through seals and bushings, then remove
tape.
Slide axles up to differential area.
Assemble components of bevel gear assembly and in-
sert them into ring gear. Holding these parts together,
align the ring gear with the motor drive shaft gear and the
bevel gears with both shafts. See Figure 5.15.
Slide axle shafts into bevel gears and install C-rings and
thrust washers. See Figure 5.16.
NOTE:
Rotate C-rings 180° after installation.
NEW AXLE SEAL
FLUSH WITH
OUTSIDE OF
UPPER CASE LIP
FIGURE 5.14
END OF SHAFT
RING GEAR
FIGURE 5.15
C-RING -
ROTATE 180°
AFTER INSTALLATION.
FIGURE 5.16
5.6
Section V - TRANSAXLE ASSEMBLY
TRANSPORT (FREE-WHEELING)
ASSEMBLY
Install new relief valve assemblies 0.51 inches (13mm)
inside bores of center block. See Figure 5.17.
NOTE:
The sleeve on the pump port side of the center block has
a 0.9mm orifice. Itis VERY IMPORTANT to MAKE SURE
that this sleeve is installed on the correct side!
Install new pump filter. See Figure 5.18.
Install the bypass valve push pin guides, springs and push
pins. |
Install a new O-ring on the actuating pin. See Figure 5.19.
Install the actuating pin in the bore of the lower case half.
Install the actuating bracket and secure it with the E-ring.
NOTE:
Push actuating pin and bracket all the way towards the
outside before assembling case halves.
MAGNET ASSEMBLY
Install magnet in slot in lower case half. See Figure 5.20.
TRANSAXLE CASE HALVES ASSEMBLY
Clean mating surfaces of case halves, then apply a bead
of RTV gasket sealer on the surface of the lower case
half along the inside of the mounting holes. Be careful
not to get sealer in mounting holes!
Apply a bead of sealer around the two inner holes on the
lower case half.
Carefully place lower case half onto upper case half.
Check hole alignment - especially the hole over the bleed
port connector! Press halves together.
BLEED PORT
CONNECTOR
PLUG
PUMP PORT PLUG
RELIEF
7 AE VALVE
za (DY )) ASSEMBLY
IMPORTANT!
THIS SLEEVE
HAS A 0.9mm
CENTER
BLOCK
El
N= CENTER
Su eu
N
PUSH-PIN
GUIDE
PUSH PIN
SPRING
bm € en PIN
FIGURE 5.18 o
O-RING-Q
ACTUATING '
BRACKET |
E-RING <<
| FIGURE 5.19
E MAGNET
SLOT IN
LOWER CASE
HALF
5.7
Section V - TRANSAXLE ASSEMBLY
TRANSAXLE CASE HALVES ASSEMBLY
Install seventeen capscrews and tighten them in a criss-
cross pattern from center to outside. Begin with the two
inner screws shown in Figure 5.21 and torque all screws
to 200-243 Ib. in. (23-27 Nem).
NOTE:
If a new upper case half has been installed, torque all
screws to 243-278 Ib. in. (27-31 N*m).
Install new seal washer on drain plug, then install plug.
Torque plug to 174-217 Ib. in. (20-24 N*em). See Figure
5.22. |
DISC BRAKE ASSEMBLY
Install disc brake components on transaxle as shown in
Figure 5.23.
Adjust air gap between brake disc and brake lever to 0.03-
0.05 in. (0.08-1.3mm) by using shims.
Torque capscrews to 391-521 Ib. in. (44-59 Nem).
INSTALL SEVENTEEN (17) —— En;
12mm CAPSCREWS y= |
A
©, (С) <
СРО РР
=
on |
DL» / VF o |
Ly 6 -
Е. © - С
8 IS TIGHTEN FIRST!
=== -
. UA
FIGURE 5.21
INSTALL
DRAIN PLUG
(WITH NEW
SEAL WASHER
SEAL WASHE
for
|
| ' BRAKE LEVER
т MOUNTING BRACKET
= |
|
1
FIGURE 5.23
5.8
due
ot TT
Section V - TRANSAXLE ASSEMBLY
RESERVOIR COVER & BREATHER
VALVE ASSEMBLY
If the reservoir cover was removed, it must have a bead
of sealant applied before installation.
Install covers and torque the four capscrews to 174-217
Ib. in. (20-24 N*em). See Figure 5.24.
Remove oil fil cap and breather valve assembly.
Fill oil reservoir with 1.7 U.S. at. (1.6 liter) of 10W30 Class
FSCD motor oil. Oil level should be level with the bottom
of the fill hole.
Reinstall breather assembly and oil fill cap.
TRANSAXLE QUICK-BLEED PROCEDURE
Place transaxle upside-down on work bench.
Remove pipe plug from bleed port connector. See Fig-
ure 5.25. |
Have a helper to hold the transaxle in a position to where
he can turn the brake disc while you are adding oil.
With the helper turning the brake disc, pour 10W30 Class
FSCD motor oil into the plug hole. Stop pouring oil when
it is level with the bottom of the hole.
Wrap pipe plug threads with Teflon® tape and install in
bleed port connector. Torque plug to 72 Ib. in. (8 Nem).
BREATHER
VALVE
ASSEMBLY
|
Ed | &)—OIL FILL
| | NN
G > © NON
HQ NENE
FIGURE 5.24
PLUG FROM
BLEED PORT
CONNECTOR
FIGURE 5.25
5.9
NOTES
' +
. EE à
+ & i
Section VI
TRANSAXLE INSTALLATION
a", Te
AEN 4
Section VI - TRANSAXLE INSTALLATION
SNAPPER LT TRACTOR MODELS:
ELT140H33BBV, LT140H33BBV, LT140H38BBV,
LT150H38BBV 8 LT155H42BBV
Reassemble the transaxle and tractor components re-
moved in Sections lll and IV. Figure 6.1 and the adjoin-
ing parts list will aid in reassembly. |
6.2 ae
a A 4 LC
4 7
Section VI - TRANSAXLE INSTALLATION
PARTS LIST
ITEM PART NO.
11
12
13
14
15
16
18
19
- 20
21
22
23
24
25
26
27
28A
28B
29A
29B
29C
60 —1 С) Сл + ©) № -
2-8083
2-8078
2-8084
2-8077
2-8076
3-4453
2-8049
2-8334
9-1277
9-1601
1-7173
3-2070
3-4137
3-4139
9-1284
9-0702
9-1516
‚| 3-4154
9-1296
3-4146
3-4140
2-9738
1-1022
2-9617
—2-9618
5-2845
5-2846
5-3563
1-2234
2-4453
2-4454
2-6112
2-6113
2-9589
3-4162
13-4155
5-3386
— 4-1612
— 2-8036
3-4192
9-0593
9-1331
3-4267
5-3380
1.2306
3.4178
1-1791
9-1592
3-4400
DESCRIPTION
TRANSAXLE, Hydro Drive, Tuft-Torq Models K50/K55
RING, Retaining (2)
WASHER, Fan/Hub (2)
PULLEY, Drive
FAN
WASHER, Flat, .132 x .781 ID. x 1.5 O.D. (2)
SPACER (2) |
BELT, Traction Drive (Models ELT140H33BBV, LT140H33BBV, LT140H38BBV,
LT150H38BBV, & LT155H42BBV) (Hydro Drive Only!)
— SETSCREW, 1/4-20 x 5/16" Locking
NUT, 5/16-18 Hex Flange Lock (5)
KEY, Square, 3/16 x 3/16 x 2 1/2" (2)
WASHER, Flat, 3/4" O.D.
GRIP, Roll Release
DETENT, Roll Release
SCREW, 3/8-16 x 1 3/4" Self-Tapping (2)
BOLT, 5/16-18 x 2 1/4" Hex Flange Lock (4)
COTTER-PIN, 5/32 x 1”
LINK, Roll Release
WASHER
ROLL-PIN, Speed Control Arm
WIREFORM, Roll Release
RING, Retaining
HUB-CAP |
WASHER, Flat, .07 x .77 1.D. x 1.31 O.D. (2)
WASHER, Hub-Cap Retaining
ASSEMBLY, Rear Tire & Rim (Models ELT140H33BBV & LT140H33BBV)
(Includes items 27, 28A, & 29A)
ASSEMBLY, Rear Tire & Rim (Model LT140H38BBV) (Includes items 27,
288, & 29B)
ASSEMBLY, Rear Tire & Rim (Models LT150H38BBV & LT1 55H42BBV)
(Includes items 27, 28B, á 29C)
VALVE, Air (Snap-in)
RIM, 8 x 5.375 (Models ELT140H33BBV & LT140H33BBV) | |
RIM, 8 x 7.00 (Models LT140H38BBV, LT150H38BBV, & LT155H42BBV)
TIRE, 18 x 7.50 (Models ELT140H33BBV 8 LT140H33BBV)
TIRE, 18 x 8.50 (Model LT140H38BBV)
TIRE, 18 x 9.50 (Models LT150H38BBV & LT15SH42BBV)
COTTER-PIN, 5/16 Self-Locking
SPRING, Torsion (Roll Release)
ASSEMBLY, Speed Control/Friction (Includes Part No’ s. Listed Below)
WELDMENT, Speed Control Arm
— SPRING
STUD, Friction
NUT, 3/8-16 Hex Flange Lock
WASHER, .120 x .406 1.D. x 1.5 O.D. (2)
WASHER, Friction Pad (2)
SUPPORT, Friction Stud Assembly (Includes Part No's. Listed Below)
BUSHING, Flange
SUPPORT, Friction Stud
RETAINER, 5/16 Bolt
BOLT, 5/16-18 x 2” Hex Flange Lock
BRACKET, Spool
6.3 “i
NOTES
Section VII
PREPARING TRANSAXLE FOR OPERATION
7.1
Section VII - PREPARING TRANSAXLE FOR OPERATION
TRANSAXLE BLEED PROCEDURE
Raise and block rear wheels 2 inches off the floor.
Start engine, allow it to warm up, then set throttle at slow
idle.
Have a helper to move the speed control lever into for-
ward, neutral and reverse as you engage , then disen-
gage the roll release lever. See Figure 7.1.
Continue to move the roll release lever until the wheels
begin to turn.
As wheels start to turn, disengage the roll release lever
and move the speed control lever to neutral.
Lower tractor to floor.
Sit in the operator's seat, shift speed control lever into a
low forward speed and, if necessary, have someone to
push the tractor until the transaxle will drive under its own
power.
Drive tractor at fast idle speed and shift speed control
lever back-and-forth until transaxle gives full response.
‘Check transaxle oil level. Add oil as required.
A.
DRIVE > NX
POSITION
ROLL RELEASE
FIGURE 7.1
+, 4 7
A 4
7.2 ие
“4 a"
NOTES
SERVICE MANUAL
‘TUFF TORQ MODEL K50/K55
HYDROSTATIC TRANSAXLE
SNAP В ER McDonough, GA., 30253 U.S.A. MANUAL No. 07011 (LR. 7/94)
| CE.
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