Hitachi 236464 manual Service, Required Tools, Disconnecting the Displacement Pump

Required Tools

DSet of adjustable wrenches

DLarge pipe wrench

D2–3/4 in. socket wrench

DTorque wrench

DRubber mallet

DO-ring pick

DLarge vise

DPlastic or wooden block, approximately 6 in. square x 1 in. thick

DThread lubricant

DThread 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 10.

2.Relieve the pressure.

3.Disconnect the air hose and fluid hose.

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 inlet (V) of the motor. If the motor does not require servicing, leave it attached to its mounting.

CAUTION

Be sure to use two people when lifting, moving, or disconnecting the entire 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), only one person is required. The displacement pump weighs approximately 13 kg (29 lb).

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.

5.Using an adjustable wrench (or hammer and punch), unscrew the coupling nut (106) from the motor shaft (W). Do not lose or drop the coupling collars (107). See Fig. 4.

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 16 for displacement pump service. To service the air 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. 4.

2.Have one person 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) as was noted in step 4 under Disconnecting the Displacement Pump. Position the displacement pump (109) on the tie rods (105).

3.Screw the nuts (108) onto the tie rods (105) and torque to 68–81 NSm (50–60 ft-lb).

4.Screw the coupling nut onto the motor shaft (W) 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 195–210 NSm (145–155 ft-lb).

5.Reconnect all hoses. Reconnect the ground wire if it was disconnected. Fill the packing nut (8) 1/3 full of Graco Throat Seal Liquid or compatible solvent.

6.Turn on the air supply. 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 (8) to 61–75 NSm (45–55 ft-lb).