Displacement Pump Service

DBe sure you have all necessary parts on hand before you start. If using a repair kit, use all the parts in the kit for the best results.

DDisplacement Pump Repair Kit 241623 is available. Parts included in the kit are marked with a dagger ([) in the parts drawing and list.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 7.

1.Flush the pump.

2.Relieve the pressure before you proceed.

3.Disconnect the hoses, remove the pump from its mounting, and clamp the air motor base (5) in a vise.

CAUTION

To avoid damaging the shovel tube, do not use slots in the tube to tighten or loosen tube.

4.Use strap wrench to screw shovel tube (67) off of pump cylinder (59).

5.Use strap wrench to screw shovel (66) off of shovel rod (58).

6.Use strap wrench on pump cylinder (59) to screw it out of extension tube (64). Screw tube connector (63) out of pump cylinder. Remove bearing (61) and seal (62).

7.Screw the shovel rod (58) out of the piston (52). Remove the lower ball (56). Screw the piston out of the extension rod (57). Remove the upper ball (56), retaining washer (53), and seal (54).

8.Clean all the parts in a compatible solvent and inspect them for wear or damage. Use all the parts in the repair kit, and replace other parts as necessary.

9.Generously lubricate all the parts with light water-resistant grease and reassemble the pump.

NOTES:

Torque the shovel tube (67) to the pump cylinder (59) at 45 to 55 ft-lb (61 to 75 N-m), and torque the pump cylinder (59) to the extension tube (64) at 45 to 55 ft-lb (61 to 75 N-m).

Torque the shovel rod (58) to the piston (52) at 25 to 30 ft-lb (34 to 41 N-m), and torque piston (52) to the extension rod (57) at 25 to 30 ft-lb (34 to 41 N-m).

10.If the ground wire was disconnected before servicing, be sure to reconnect it before you operate the pump.

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