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Required Tools
D Torque wrench
D Bench vise, with soft jaws
D Rubber mallet
D Hammer
D O-ring pick
D 13 mm (1/2 in.) dia. brass rod
D Set of socket wrenches
D Set of adjustable wrenches
D Pipe wrench
D Packing nut wrench (109, supplied)
D Thread lubricant
D Thread sealant
D LoctiteR 2760t or equivalent
Disconnecting the Displacement Pump
1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
2. Relieve the pressure.
3. Disconnect the air and fluid hoses.
4. Disconnect the displacement pump (106) from the
motor (101) as follows. Be sure to note the relative
position of the pump's fluid outlet (X) to the motor
air inlet (Y). If the motor does not require servicing,
leave it attached to its mounting.
CAUTION
Be sure to use at least two people when lifting,
moving, or disconnecting the pump. This pump is too
heavy for one person. If you are disconnecting the
displacement pump from a motor which is still
mounted (for example, on a ram), be sure to support
the displacement pump while it is being discon-
nected, to prevent it from falling and causing injury or
property damage. Do this by securely bracing the
pump, or by having at least two people hold it while
another disconnects it.
14
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Service
5. Using an adjustable wrench (or a hammer and
rod), unscrew the coupling nut (104) from the
motor shaft (Z, Model 237707) or adapter (107,
Model 237518). Do not lose or drop the coupling
collars (105). See Fig. 5.
6. Hold the tie rod flats with a wrench to keep the
rods from turning. Unscrew the nuts (103) from the
tie rods (102). Carefully remove the displacement
pump (106) from the motor (101).
7. Refer to page 16 for displacement pump service.
To service the air motor, refer to the separate
motor manual, supplied.
Reconnecting the Displacement Pump
NOTE: On Premier models, ensure that the rod adapt-
er (107) has not loosened during maintenance. Proper
torque is necessary to prevent the rod adapter from
loosening during the pump operation.
If the rod adapter (107) has loosened during mainte-
nance, remove the adapter and apply LoctiteR 2760t
(or equivalent) to the rod adapter and air motor piston
threads, and then torque as specified in Fig. 5.
1. Make sure the coupling nut (104) and the coupling
collars (105) are in place on the displacement rod
(1). See Fig. 5.
2. Use at least two people to hold the displacement
pump while another reconnects it to the motor (see
the CAUTION above). Orient the pump's fluid
outlet (X) to the air inlet (Y) as was noted in step 4
under Disconnecting the Displacement Pump.
Position the displacement pump (106) on the tie
rods (102).
3. Screw the nuts (103) onto the tie rods (102) and
torque to 81–89 NSm (60–66 ft-lb).
4. Loosely screw the coupling nut onto the motor
shaft (Z, Model 237707) or adapter (107, Model
237518). Hold the motor shaft (Z) or adapter (107)
flats with a wrench to keep it from turning. Use an
adjustable wrench to tighten the coupling nut.
Torque to 196–210 NSm (145–155 ft-lb).
5. Torque the packing nut (2) to 136–149 NSm
(100–110 ft-lb).
Continued on page 14.
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