Low-Pressure Pump SER 7880-C1
Alemite Corporation 5 Revision (6-00)
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
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 dis-
charge of pressure and/or fluid can result in
injury.
Read each step of the instructions carefully.
Make sure a proper understanding is achieved
before proceeding.
Disassembly
Separate Pump Tube from Air Motor
1. Clamp Air Motor Assembly (1) horizontally in a
soft-jaw vise at the wrench flats on the air inlet
body.
2. Unscrew the tube from the air inlet body.
CAUTION
Support the pump tube assembly during
removal. Damage to components can occur.
3. Remove Clip (4) that secures the air motor rod to
Piston Rod (5).
4. Unscrew the pump rod [with attached components]
from the Air Motor’s rod.
• Rotate the entire pump tube assembly.
5. Remove the Air Motor’s tube from Body (11).
Pump Tube Assembly
Body Assembly
6. Remove O-Ring (10) from the Body.
7. Unscrew Packing Screw (6) from the Body.
8. Unscrew Cylinder (19) [with attached components] from
the Body.
9. Remove Piston Rod (5) [with attached components] from
the bottom of the Body.
10. Remove Gasket (18) from the Body.
11. Remove Female Back-Up Ring (7), Packing Rings (8),
and Male Support Ring (9) from the Body.
Piston Rod Assembly
12. Unscrew Seat (17) from the Piston Rod.
• Insert a punch or similar tool through the hole in the
Rod.
13. Remove Ball (16), Spacer (12), Packing Cup (13),
Washer (14), additional Packing Cup (13), and Washer
(15) from the Seat.
Valve Body Assembly
14. Unscrew the Cylinder from Valve Body (22).
15. Remove Gasket (18), Stop Washer (20), additional Gasket
(18), and Ball (21) from the Valve Body.
Clean and Inspect
1. Clean all metal parts in cleaning solvent. The solvent
should be environmentally safe.
2. Inspect all parts for wear and/or damage.
• Replace as necessary.
3. Inspect Piston Rod (5) for score marks.
• Replace as necessary.
4. Inspect bore of Cylinder (19) for any score marks.
• Replace as necessary.
5. Closely inspect the mating surfaces of all check valve
components for any imperfections. Ensure a smooth and
clean contact is obtained when assembled.
EXAMPLE: Place Ball (21) into Valve Body
(22). Fill the Valve Body with solvent. Make
sure no leakage occurs.
