Section:
MOYNO® 500 PUMPS
Page: 1 of 8
Date: March 1, 1998
SERVICE MANUAL
MOYNO® 500 PUMPS
300 SERIES
331, 332, 333, 344, 356 AND 367 MODELS
Mechanical Seal Models
Packing Gland Models
MODELS
33101 34401
33104 34404
DESIGN
33201 35601
33204 35604
33108 33308
34411
33301 36701
33304 36704
FEATURES
33208 34408
35611
Housing:
Cast Iron
AISI 316 SS
Nylon
Cast Iron
Chrome plated
Chrome plated
Chrome plated
Chrome plated
Pump Rotor:
416 SS
316 SS
416 SS
416 SS
Pump Stator:
NBR (Nitrile)
NBR (Nitrile)
NBR (Nitrile)
NBR (Nitrile)
Shaft:
416 SS
316 SS
416 SS
416 SS
Flexible Joint:
Carbon steel/
316 SS/
Carbon steel/
Carbon steel/
NBR
NBR
NBR
NBR
Bearings:
Ball (sealed)
Ball (sealed)
Ball (sealed)
Ball (sealed)
Mechanical Seal: Carbon-ceramic
Carbon-ceramic
Carbon-ceramic --Packing:
------Braided PTFE
Note: Alternate elastomers available. Refer to Repair/Conversion kit numbers, page 8.
INSTALLATION
Mounting Position. Pump may be mounted in any
position. When mounting vertically, it is necessary to keep
bearings above seals to prevent possible seal leakage into
bearings.
Pre-Wetting. Prior to connecting pump, wet pump
elements and mechanical seal or packing by adding fluid to
be pumped into suction and discharge ports. Turn shaft
over several times in a clockwise direction to work fluid into
elements.
Piping. Piping to pump should be self-supporting to avoid
excessive strain on pump housings. See Table 1 for suction
and discharge port sizes of each pump model. Use pipe
“dope” or tape to facilitate disassembly and to provide seal.
35613
AISI 316 SS
Chrome plated
316 SS
NBR (Nitrile)
316 SS
316 SS/
NBR
Ball (sealed)
--Braided PTFE
Drive. On belt driven units, adjust belt tension to point of
non-slip. Do not overtighten.
On direct drive units, coupling components should be
aligned and spaced at least 1/16” apart.
Pump rotation must be clockwise when facing shaft to
prevent damage to pump. Check direction of rotation before
startup.
Water Flush of Packing (356 Models Only). The packing
may be either grease lubricated through a grease fitting in
the stuffing box or have plumbing connected to the housing
to allow a water flush.
Maximum speed is 1750 rpm.
When the material being pumped is abrasive in nature, it
may be advantageous to flush the packing to prevent
leakage under packing and excessive shaft wear.
Page 2
Clean water can be injected through a 1/8” NPT tapped
hole that normally houses the grease fitting for lubricating the
packing. The water can be permitted to leak axially along the
shaft in either direction or can be removed from the second
tapped hole in the stuffing box. In both cases, the discharge
from the stuffing box should be throttled slightly to maintain
10-15 PSI higher pressure in the stuffing box than is present
in the discharge housing.
Pump Models
Table 1. Pump Data
331 332 333 344
Suction Port
3/4* 3/4*
(NPT)
Discharge
3/4
3/4
Port (NPT)
Discharge
150 100
Pressure
(psig)
*08 versions = 1” NPT
356
367
3/4*
3/4*
1-1/2
2
3/4
3/4
1-1/4
2
50
40
50
50
Table 2. Temperature Limits
Elastomer
Temperature Limits
*NBR
10°-160°F
*EPDM
10°-210°F
*FPM
10°-240°F
*NBR = Nitrile
*EPDM = Ethylene-Propylene-Diene Terpolymer
*FPM = Fluoroelastomer
OPERATION
Self-Priming. With wetted pumping elements, the pump is
capable of 25 feet of suction lift when operating at 1750 rpm
with pipe size equal to port size.
DO NOT RUN DRY. Unit depends on liquid pumped for
lubrication. For proper lubrication, flow rate should be at least
10% of rated capacity.
Pressure and Temperature Limits. See Table 1 for
maximum discharge pressure of each model. Unit is suitable
for service at temperatures shown in Table 2.
Storage. Always drain pump for extended storage periods
by removing suction housing bolts and loosening suction
housing.
TROUBLE SHOOTING
WARNING: Before making adjustments, disconnect
power source and thoroughly bleed
pressure from system. Failure to do so
could result in electric shock or serious
bodily harm.
Failure To Pump.
1. Belt or coupling slip: Adjust belt tension or tighten set
screw on coupling.
2. Stator torn; possibly excessive pressure: Replace stator,
check pressure at discharge port.
3. Wrong rotation: Rotation must be clockwise when facing
shaft.
4. Threads in rotor or on shaft stripped: Replace part. Check
for proper rotation.
5. Excessive suction lift or vacuum.
Pump Overloads.
1. Excessive discharge pressure: Check discharge pressure
for maximum rating given in Table 1. Check for
obstruction in discharge pipe.
2. Fluid viscosity too high: Limit fluid viscosity to 20,000 CP
or 100,000 SSU.
Viscosity CP
1-300
300-1,000
1,000-2,000
2,000-5,000
5,000-10,000
10,000-20,000
Limit RPM
1750
1200
700
350
180
100
3. Insufficient motor HP: Check HP requirement.
Noisy Operation.
1. Starved suction: Check fluid supply, length of suction line,
and obstructions in pipe.
2. Bearings worn: Replace parts; check alignment, belt
tension, pressure at discharge port.
3. Broken flexible joint: Replace part, check pressure at
discharge port.
4. Insufficient mounting: Mount to be secure to firm base.
Vibration induced noise can be reduced by using mount
pads and short sections of hose on suction and discharge
ports.
Mechanical Seal Leakage (Mechanical Seal Models
Only).
1. Leakage at startup: If leakage is slight, allow pump to run
several hours to let faces run in.
2. Persistent seal leakage: Faces may be cracked from
freezing or thermal shock. Replace seal.
Packing Leakage (Packing Models Only).
1. Leakage at startup: Adjust packing as outlined in
maintenance instructions.
Note: Slight leakage is necessary for lubrication of packing.
2. Persistent leakage: Packing rings and/or shaft may be
worn. Replace parts as required.
Pump Will Not Prime.
1. Air leak on suction side: Check pipe connections.
MAINTENANCE
General. These pumps have been designed for a minimum
of maintenance, the extent of which is routine lubrication and
adjustment of packing. The pump is one of the easiest to
work on in that the main elements are very accessible and
require few tools to disassemble.
Packing Lubrication (356 Models Only). The zerk
fitting on the side of the suction housing leads to the lantern
ring halves in the mid-section of the packings. At least once a
week, inject a small quantity of good quality grease, such as
MPG-2 Multi Purpose Grease (Du Bois Chemical), or
equivalent, into the zerk fitting to lubricate the packings.
Note: For Model 34411, lubricate packing by applying a
liberal amount of grease during assembly.
Page 3
Packing
Adjustment
(Packing
Models
Only).
Packing gland attaching nuts should be evenly adjusted so
they are little more than finger tight. Over-tightening of the
packing gland may result in premature packing failure and
possible damage to the shaft and gland.
When the packing is new, frequent minor adjustments
are recommended for the first few hours of operation in
order to compress and seat the packing. Be sure to allow
slight leakage for lubrication of packing.
When excessive leakage can no longer be regulated by
tightening the gland nuts, remove and replace the packings
in accordance with the DISASSEMBLY and REASSEMBLY
instructions. The entire pump need not be disassembled to
replace the packings.
Bearing Lubrication. The prelubricated, fully sealed
bearings do not require additional lubrication.
PUMP DISASSEMBLY
WARNING: Before disassembling pump, disconnect
power source and thoroughly bleed
pressure from system. Failure to do so
could result in electric shock or serious
bodily harm.
To Disassemble Mechanical Seal Models:
1. Disconnect suction and discharge piping.
2. Remove screws (112) holding suction housing (2) to
3.
4.
5.
6.
pump body (1). Remove suction housing and stator (21).
Remove rotor (22) from flexible joint (24) by turning
counter-clockwise (RH thread). Use 3/16 inch diameter
punch to remove rotor pin (45) on Model 36701.
Flexible joint (24) can be removed from shaft (26) by
using a 3/16 inch allen wrench in end of joint (1/4 inch
wrench on 356 Models) and turn counter-clockwise. Use
3/16 inch diameter punch to remove shaft pin (46) on
Model 36701.
Carefully slide mechanical seal (69) off shaft (26).
Carefully pry seal seat out of pump body (1). If any parts
of mechanical seal are worn or broken, the complete
seal assembly should be replaced. Seal components are
matched parts and are not interchangeable.
The bearings (29) and shaft (26) assembly can be
removed from pump body (1) after snap ring (66) has
been removed. To remove the assembly, lightly tap the
shaft at threaded end using a block of wood to protect
the threads. The bearings may be pressed off the shaft.
To Disassemble Packing Models:
1. Disconnect suction and discharge piping.
2. Remove screws (112) which hold suction housing (2) to
pump body (1). Remove suction housing and stator (21).
3. Remove rotor (22) from flexible joint (24) by turning in a
Note: Packing can be removed after shaft has been removed by pushing out from pump side of pump body
after gland (41) has been detached.
6. The bearings (29) and shaft (26) assembly can be
removed from pump body (1) after snap ring (66) has
been removed. To remove the assembly, lightly tap the
shaft at threaded end using a block of wood to protect the
threads.
7. To disassemble shaft assembly, remove snap ring (66A)
from shaft (26) and press bearings (29) and bearing
spacer (33) off the shaft.
PUMP ASSEMBLY
To Assemble Mechanical Seal Models:
1. Press bearings (29) on shaft (26), and locate slinger ring
(77) near bearing on threaded end of shaft.
Note: When replacing bearings, always press on the inner
race when assembling to shaft, and on the outer race
when pressing bearings into the housings.
2. Press shaft assembly into pump body (1) securing with
snap ring (66).
3. Install mechanical seal (69) using the following
procedure:
a. Clean and oil sealing faces using a clean light oil (not
grease).
Caution: Do not use oil on EPDM parts. Substitute
glycerin or soap and water.
b. Oil the outer surface of the seal seat, and push the
assembly into the bore in the pump body (1), seating
it firmly and squarely.
c. After cleaning and oiling the shaft, slide the seal body
along the shaft until it meets the seal seat.
d. Install seal spring and spring retainer on shaft.
4. Thread flexible joint (24) into shaft (26) in a clockwise
direction (RH thread). On 356 Models, install seal spacer
(69A) and washer (116) before threading flexible joint
onto shaft in a clockwise direction. On Model 36701, use
shaft pin (46) to pin flexible joint (24) to shaft.
5. Thread rotor (22) onto flexible joint (24) in a clockwise
direction (RH thread). On Model 36701, pin rotor (22) to
joint using rotor pin (45).
6. Slide stator (21) on rotor (22). On 331 and 332 Models,
insert rounded end of stator ring (135) into end of stator
prior to installing stator on rotor.
7. Secure stator (21) and suction housing (2), with suction
port vertically up, to pump body (1) using screws (112).
8. Proceed as in installation instructions.
counter-clockwise direction (RH thread).
4. Flexible joint (24) can be removed by using a 3/16 inch
allen wrench in end of joint (1/4 inch wrench on 356
Models) and turn in a counter-clockwise direction.
5. The packing (42) can be removed without removing the
shaft (26) using the following procedure:
a. Remove gland bolts (47).
b. Slide gland (41) away from packing (42).
c. Pull out packing (42) (and lantern ring halves (57) on
356 Models) using a packing removing tool.
To Assemble Packing Models:
1. Press bearings (29), with bearing spacer (33) in between,
on shaft (26) and secure in place using snap ring (66A).
Note: When replacing bearings, always press on the inner
race when assembling to shaft, and on the outer race
when pressing bearings into the housings.
Page 4
2. Install packing (42) before installing shaft assembly
using the following procedure:
a. Lubricate each individual ring of packing with a
grease that is insoluble in the fluid being pumped.
b. Individually assemble each ring of packing loosely
in the packing chamber of the pump body (1).
Stagger splits on rings. (Four rings, 3/16 inch
square required on Model 34411; four rings, 1/4
inch square and two lantern ring halves (57)
assembled between two rings on 356 Models).
c. Loosely install packing gland (41) on pump body (1)
using gland bolts (47).
3. Press shaft assembly into pump body (1) positioning
slinger ring (77) between packing gland (41) and bearing end of pump body. Secure the shaft assembly with
snap ring (66).
4. Thread flexible joint (24) into shaft (26) in a clockwise
direction (RH thread).
5. Thread rotor (22) onto flexible joint (24) in a clockwise
direction (RH thread).
6. Slide stator (21) on rotor (22). On 331 and 332 Models,
insert rounded end of stator ring (135) into end of stator
prior to installing stator on rotor.
7. Secure stator (21) and suction housing (2), with suction
port vertically up, to pump body (1) using screws
(112).
8. Proceed as in installation instructions.
Note: Adjust newly installed packing as described in
maintenance procedure.
WARNING: Replace belt or coupling guards
before reconnecting power.
Page 5
Page 6
PARTS LIST — 331, 332, 333, AND 344 MODELS
Item
No.
Description
1
Pump Body
1A
1B
1C
2
*21
Discharge Housing
Bearing Housing
Pump Base
Suction Housing
Stator
*22
Rotor
24
Joint
26
29
33
41
42
47
66
66A
69
77
100
112
112C
135
215
Drive Shaft
Bearing (2 req.)
Bearing Spacer
Packing Gland
Packing
Gland Bolt
Snap Ring
Snap Ring
Mechanical Seal
Slinger Ring
Pipe Plug (3 req.)
Screws (8 req.)
Screws (4 req.)
Stator Ring (331 -332 only)
Lock Washer (8 req.)
Mechanical Seal Models
33101
33201
33301
34401
330-1065-002
Packing Gland
Models
33104
33204
33304
34404
330-1910-002
33108
33208
33308
34408
34411
340-1000-001
340-2362-000
330-4587-000
340-2369-000
330-4536-000
330-1064-002
330-1911-002
330-1064-002
See Stator section
below.
See Rotor section below with circled
numbers for each series.
1
2
1
1
Carbon SteeI/NBR
316 SS/NBR
Carbon SteeI/NBR
320-1511-000
320-3759-000
320-1511-000
320-1499-000
320-2938-000
320-1499-000
320-2448-000
630-0502-031
320-1900-000
320-0101-004
340-3396-005
619-1520-161
320-1506-000
320-4182000
320-2424-000
320-6382-000
320-6384-000
610-0120-021
619-1430-103
320-5968-000
619-0860-081
619-1430-103
61 9-0890-281
320-7812-000
320-6464-000
*Recommended spare parts.
STATORS
21
21
21
Models
331
332
333
344
340-3501-120
340-3501-320
340-3501-520
340-3502-120
340-3502-320
340-3502-520
340-3503-120
340-3503-320
340-3503-520
340-3504-120
340-3504-320
340-3504-520
1 416SS - All Models
320-2729-000
330-0906-000
320-1394-000
320-1841-000
2 316SS — All Models
320-2933-000
320-2942-000
320-2936-000
320-2934-000
Standard Stator, NBR All Models
EPDM Stator
FPM Stator
ROTORS
22
22
See page 8 for Repair/Conversion Kits
Page 7
PARTS LIST — 356 AND 367 MODELS
Item
No.
Description
1
Pump Body
2
Suction Housing
*21
Stator
22
Rotor
24
Flex Joint
26
Drive Shaft
29
Bearing (2 req.)
33
Bearing Spacer
41
Packing Gland
*42
Packing
45
Rotor Pin
46
Shaft Pin
47
Gland Bolt
57
Lantern Ring Half**
66
Snap Ring
66A
Snap Ring
*69
Mechanical Seal
69A
Seal Spacer
77
Slinger Ring
112
Screws (6 req.)
115
Zerk Fitting
135
Stator Spacer
202
Shaft Key
Lock Washer (6 req.)
215
261
Pipe Plug
*Recommended spare parts.
**2 Required
Mechanical SeaI Models
Packing Gland Models
35601
35611
35613
35604
Cast Iron
316SS
Cast Iron
316SS
340-0636-000
340-1550-000
350-0420-000
350-0491-000
350-0280-000
350-0489-000
350-0280-000
350-0489-000
NBR
NBR
340-3505-120
340-3505-120
416SS
316SS
416SS
316SS
320-2304-000
320-4431-000
320-2304-000
320-4431-000
Carbon Steel
316SS
Carbon Steel
316SS
320-1583-000
320-4427-000
320-1583-000
320-4427-000
320-1759-000
320-4430-000
320-2765-000
320-4435-000
630-0552-051
320-2764-000
320-0003-004
320-0003-007
340-3396-008
Mechanical Seal Model
36701
36704
Cast Iron
316SS
350-0423-000
350-0423-007
350-0302-000
350-0302-007
NBR
340-3506-120
416SS
316SS
330-2042-000
330-3077-000
Carbon Steel
316SS
320-1749-000
320-4436-000
330-1805-000
330-1805-015
630-0552-061
320-4439-002
320-4439-001
619-1530-241
320-6585-000
320-1758-000
320-2794-000
320-3533-000
320-3945-000
320-4434-000
320-6383-000
320-1750-000
320-6385-000
619-1530-161
320-6385-000
619-1530-161
320-2503-001
330-7594-000
611-0040-240
610-0120-011
See page 8 for Repair/Conversion Kits
610-0420-010
623-0010-411
610-0420-010
610-0120-011
610-0120-011
610-0420-010
Page 8
REPAIR/CONVERSION KIT NUMBERS
ELASTOMER REPAIR/CONVERSION KITS
Item
No.
—
21
24
69
Item
No.
Description
331 Models
Kit No.
• Stator
• Joint
• Seal
Description
332 Models
NBR
EPDM
FPM
NBR
EPDM
FPM
311-9026-000
340-3501-120
320-1511-000‡
320-2424-000
311-9025-000
340-3501-320
320-6367-000†
320-6379-000
311-9054-000
340-3501-520
320-4670-000†
320-6501-000
311-9027-000
340-3502-120
320-1511-000‡
320-2424-000
311-9038-000
340-3502-320
320-6367-000†
320-6379-000
311-9055-000
340-3502-520
320-4670-000†
320-6501-000
EPDM
FPM
333 Models
344 Models
NBR
NBR
EPDM
FPM
311-9029-000
311-9028-000
311-9056-000
311-9031-000
311-9030-000
Kit No.
—
21
• Stator
340-3503-120
340-3503-320
340-3503-520
340-3504-120
340-3504320
24
• Joint
320-1511-000‡
320-6367-000†
320-4670-000†
320-1511-000‡
320-6367-000†
69
• Seal
320-2424-000
320-6379-000
320-6501-000
320-2424-000
320-6379-000
t316SS/with appropriate elastomer.
‡Carbon steel. NBR kits are available only with carbon steel joints; a 316SS/NBR joint for 331-344 Models is
available as 320-3759-000.
Item
No.
–
21
24
69
45
46
–
21
24
340-3504520
320-4670-000†
320-6501-000
NBR
356 Models
EPDM
FPM
NBR
367 Models
EPDM
FPM
311-9033-000
311-9032-000
311-9058-000
311-9060-000
311-9036-000
311-9124-000
340-3505-120
320-1583-000‡
320-3945-000
340-3505-320
320-6369-000†
320-6380-000
340-3505-520
320-4671-000†
320-6510-000
340-3506-120
320-1749-000‡
320-1750-000
320-4439-002
320-4439-001
340-3506-320
320-6378-000‡
320-6390-000
320-4439-002
320-4439-001
340-3506-520
3206515-000‡
320-6517-000
320-4439-002
320-4439-001
311-9035-000
311-9034-000
311-9059-000
340-3505-120
320-1583-000‡
340-3505-320
320-6369-000†
340-3505-520
320-4671-000†
Description
Kit No. (Mech. Seal
Models)
• Stator
• Flex Joint
• Seal
• Rotor Pins
• Shaft Pin
Kit No
(Packing Gland Models)
• Stator
• Joint
311-9057-000
†316SS/with appropriate elastomer.
‡Carbon steel. NBR kits are available only with carbon steel joints; a 316SS/NBR joint for Model 35604 and
35613 pumps is available as 320-4427-000; a 316SS/NBR joint for model 36704 is available as 320-4436-000.
ABRASION RESISTANT SEALS
Models
Elastomer
NBR
EPDM
FPM
331-344
356
36701
3206460000
3206502000
3206503000
3206505000
3206506000
3206507000
3206511000
3206512000
3206513000
NBR = Nitrile
EPDM = Ethylene-Propylene-Diene Terpolymer
FPM = Fluoroelastomer
© 1999 by Moyno, Inc.
® Moyno is a registered trademark of Moyno, Inc.
Printed in U.S.A.
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Attn: Tish Wilson
P. O. Box 960
3. Fax this form to 937-327-3177
Springfield, OH 45501-0960
U.S.A.
Thank you for choosing a Moyno Pump. Please take the time to complete this warranty registration form.Upon receipt
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