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Low-Pressure Transfer Pump
Overhaul
NOTE: Refer to Figure 2 for component
identification on all overhaul procedures.
Prior to performing any maintenance procedure, the
following safety precautions must be observed. Personal
injury may occur.
WARNING
Do not use halogenated hydrocarbon sol-
vents such as methylene chloride or 1,1,1 trichlo-
roethane in this pump. An explosion can result
within an enclosed device capable of containing
pressure when aluminum and/or zinc-plated parts
in the pump come in contact with halogenated
hydrocarbon solvents.
Release all pressure within the system prior to
performing any overhaul procedure.
• Disconnect the air supply line from the pump
motor.
• Into an appropriate container, operate the
control valve to discharge remaining pressure
within the system.
Never point a control valve at any portion of your
body or another person. Accidental discharge of
pressure and/or material can result in injury.
Read each step of the instructions carefully. Make
sure a proper understanding is achieved before
proceeding.
Disassembly
Separate Air Motor from Pump Tube
1. Clamp the pump assembly in a soft-jaw vise at
Valve Body (28).
2. Remove Cover (1a).
• Pry and swing the Cover sideways away from the
Cylinder.
• Refer to SER 339413 for details.
3. Remove Screw (1b) from the Top Cap.
4. Remove Nuts (1d) that secure the Body to Air Motor
Assembly (1).
5. Remove Bolts (1c) from the Top Cap.
• Remove Keepers (11) from the Body.
6. Remove the Top Cap from the Cylinder.
1-800-548-1191 - http://www.partdeal.com - info@partdeal.com
CAUTION
Remove the Cylinder with care. Damage to Quad-
Ring (6) and/or O-Ring (9) can occur.
7. With a side-to-side motion, pull the Cylinder from the
Body and Air Piston (5).
8. Remove O-Ring (9) from the Body.
9. Remove the Bottom Cap from the Body.
10. Unscrew Shut-Off Valve (2) from the Air Motor
Assembly as required.
Pump Assembly
11. Unscrew the Pump Body from Cylinder (25).
NOTE: Use Bushing (13) as leverage.
12. Remove O-Ring (12) from the Pump Body.
Air Piston Assembly
13. Remove Nut (3) and Washer (4) that secures Air
Piston (5) to Rod (19).
NOTE: Place an appropriate size punch or
other suitable tool into the hole of the Rod.
14. Remove the Air Piston from the Rod.
15. Remove Quad-Ring (6) from the Air Piston.
16. Remove O-Ring (7) and Washer (8) from the Rod.
Rod and Fluid Piston Assembly
17. Remove the Rod (with attached components) from the
Pump Body.
18. Remove lower Nut (24) that secures Fluid Piston (21) to
the Rod.
NOTE: Place an appropriate size punch or
other suitable tool into the hole of the Rod.
19. Remove Plate (23), Gasket (22), and the Fluid Piston
from the Rod.
20. Remove Retaining Ring (20) from the Rod as needed.
Pump Body Assembly
21. Remove O-Ring (9) from the Pump Body.
22. Remove Retaining Ring (18), Washer (17), Seal (16),
Bearing (15), and Seal (14) from the Pump Body.
23. Unscrew Bushing (13) from the Pump Body as required.
5
SER 3396101-1
Revision (8-06)
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