Displacement Pump Service
237510 and 222801 Displacement Pumps 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 10.
2.Relieve the pressure.
3.Reference Roof Rig Parts Drawings, pages 18 through 27.
4.Disconnect the air or hydraulic hose and the fluid hose. Plug all hydraulic hoses immediately, to prevent contamination of the hydraulic system.
5.Disconnect the displacement pump (46) from the motor (29) as follows. Note the relative position of the pump fluid outlet (81) to the hydraulic inlet (76) of the motor. If the motor does not require servic- ing, leave it attached to its mounting.
CAUTION
Use at least two people when lifting, moving, or dis- connecting the pump. This pump is too heavy for one person. Support the displacement pump while it is being disconnected, to prevent it from falling and causing injury or property damage.
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.
6.Using an adjustable wrench (or hammer and punch), unscrew the coupling nut (170) from the motor shaft ( Ref. 29). Take care not to lose or drop the coupling collars (80).
7.Hold the tie rod flats with a wrench to keep the rods from turning. Unscrew the nuts (48) from the tie rods (47). Carefully remove the displacement pump (46) from the motor (29).
8.Refer to separate manual listed in parts list for displacement pump service. To service the hydrau- lic motor, refer to the separate motor manual, supplied.
Reconnecting the Displacement Pump
1.Make sure coupling nut (170) and coupling collars (80) are in place on displacement rod (Ref. 29).
2.Use at least two people to hold the displacement pump while another reconnects it to the motor (see the preceding CAUTION). Orient the pump fluid outlet (81) to the hydraulic inlet (76) as was noted in step 5 under Disconnecting the Displacement Pump. Position the displacement pump (46) on the tie rods (47).
3.Screw the nuts (48) onto the tie rods (47) and torque to
4.Screw coupling nut onto motor shaft (Ref. 29), loosely. Hold the motor shaft flats with a wrench to keep it from turning. Use an adjustable wrench to tighten the coupling nut. Torque to
5.Reconnect all hoses. Reconnect the ground wire if it was disconnected. Fill the packing nut (2) 1/3 full of Graco Throat Seal Liquid or compatible solvent.
6.Turn on the hydraulic power supply. Open the hydraulic return line valve first, then the supply line valve. Run the pump slowly to ensure proper operation.
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 10.
7.Before returning the pump to production, relieve the pressure and retorque the packing nut (2) to
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