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Required Tools
Set of adjustable wrenches
Large pipe wrench
Torque wrench
Rubber mallet
O-ring pick
Large vise
Thread lubricant
Thread sealant
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 12.
2. Relieve the pressure.
3. Disconnect the air or hydraulic hose and the fluid
hose. Plug all hydraulic hoses immediately, to
prevent contamination of the hydraulic system.
4. Disconnect the displacement pump (109) from the
motor (101) as follows. Note the relative position of
the pump's fluid outlet (U) to the air (V) or hydrau-
lic inlet of the motor. If the motor does not require
servicing, leave it attached to its mounting. See
Fig. 5.
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 wall bracket), be sure to
support the displacement pump while it is being
disconnected, to prevent it from falling and causing
injury or property damage. Do this by securely brac-
ing the pump, or by having at least two people hold it
while another disconnects it.
If the pump is mounted on a cart, slowly tip the cart
backward until the handle rests on the ground, then
disconnect the displacement pump.
Service
5. Using an adjustable wrench (or hammer and
punch), unscrew the coupling nut (106) from the
motor shaft (W). Take care not to lose or drop the
coupling collars (107). See Fig. 5.
NOTE: On Model 237283, disconnect the riser tube
(119) at either the elbow (120) or the connector (118).
See the Parts Drawing on page 27.
6. Hold the tie rod flats with a wrench to keep the
rods from turning. Unscrew the nuts (108) from the
tie rods (105). Carefully remove the displacement
pump (109) from the motor (101).
7. Refer to page 20 for displacement pump service.
To service the air or hydraulic motor, refer to the
separate motor manual, supplied.
Reconnecting the Displacement Pump
1. Make sure the coupling nut (106) and the coupling
collars (107) 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 at left). Orient the pump's fluid
outlet (U) to the air inlet (V) or hydraulic inlet as
was noted in step 4 under Disconnecting the
Displacement Pump. Position the displacement
pump (109) on the tie rods (105).
NOTE: On Model 237283, reconnect the riser tube
(119) at either the elbow (120) or the connector (118).
3. Screw the nuts (108) onto the tie rods (105) and
torque to 81–89 N.m (60–66 ft-lb).
Continued on the next page.
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