307-427
11
Pump Service
Disconnecting the Air Motor
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
1. Flush the pump.
2. Relieve the pressure. Remove the pump from its
mounting.
3. See Fig. 6. Unscrew the tie rod locknuts (103).
4. Remove the clip pin (105) and headed pin (104).
5. Raise the air motor (115) away from the displace-
ment pump (114). Unscrew the displacement rod
(15) from the air motor connecting rod (S).
6. To order pump parts, refer to the parts lists on
pages 12–16. Refer to pages 17–34 for displace-
ment pump service and parts information. Refer to
manual 307–456 for air motor service and parts
information.
Reconnecting the Air Motor
1. When reconnecting the air motor, use lithium base
grease on the threads of the displacement rod
(15). Make sure the o-ring (14) is in place on the
rod.
2. Insert the muffler (T) into the air motor connecting
rod (S) as shown in Fig. 6.
3. Tighten the displacement rod (15) into the air mo-
tor connecting rod hand tight, and install the pins
(104 and 105).
4. Apply thread sealant to the threads of the tie rods
(106). To ensure proper alignment, first thread the
tie rod locknuts (106) loosely onto the tie rods,
then torque evenly to 15 N.m (8 ft–lb).
NOTE:
Removing the muffler (T) will increase both
pump flow rate and exhaust noise.
5. Reconnect the groundwire if it was disconnected
during service.
03766
Fig. 6
1
3
2
115
103
105
104
106
114
14
S
T
15
Grease the threads.
Apply thread sealant.
Torque evenly to
15 N.m (8 ft–lb).
3
2
1
