Repair
15
309512
Repair
Tools Required
•
Hex wrenches - sizes 3, 5, 6, 8, 14, 17mm
•
Open-ended spanner wrenches - sizes 22, 30mm
•
Pliers
•
Open-ended socket wrench - size 12mm
Disconnect the Motor from the
Displacement Pump
1.
Flush the pump, if possible (page 11). Relieve the
pressure (page 9).
2.
Disconnect the air and fluid hoses and the ground
wire.
3.
Remove the pump from its mounting and take it to
the work bench.
4.
Remove the screws (103). Be careful not to lose the
associated lock washers (104).
5.
Pull the displacement pump away from the air motor
enough to insert a tool (screwdriver, hex wrench,
etc.) into the cross hole of the piston (A).
6.
Holding the mating threaded insert (3) in the air
motor across its 30 mm flats, unscrew the piston.
Reconnect the Motor to the
Displacement Pump
1.
Reconnect the threaded piston to the threaded
insert in the air motor. Torque to 61-68 N•m (45-50
ft-lb). Push the fluid section down onto the air motor.
2.
Install the lock washers (104) and screws (103).
Torque to 6.8-7.3 N•m (60-65 in-lb).
3.
Reinstall the pump on its mounting.
4.
Reconnect the ground wire and the air and fluid
hoses. Return the pump to service.
CAUTION
•
Never twist the bellows. The threaded con-
nector should never be loosened until the
housing has been removed. Conversely, the
housing should never be installed until the
bellows is securely attached to the piston rod
with the threaded connector.
When the threaded insert (3) is accessible, the air
motor piston is in its fully extended position and
should remain in this position throughout any fur-
ther disassembly of the air motor.
F
IG
. 4 Pump Connection
A
104
103
3
