Hitachi 236464 manual Displacement Pump Service, Disassembly

Service

DISPLACEMENT PUMP SERVICE

Disassembly

When disassembling the pump, lay out all the removed parts in sequence, to ease reassembly.

NOTE: Packing Repair Kits are available. For the best results, use all the new parts in the kit. Kit parts are marked with an asterisk, for example (3*). You can also convert the pump to different packing materials. Refer to page 24.

1.Place the pump lengthwise in a large vise, with the jaws on the outlet housing (6) as shown in Fig. 5. Using the supplied wrench (110), loosen, but do not remove, the packing nut (8).

2.Using a 2–3/4 in. socket or a pipe wrench, un- screw the intake valve (5) from the intake housing (7). Be careful to catch the intake ball (13) as you remove the intake valve, so that it does not fall and suffer damage. Remove the seal (30) from the intake valve. Inspect the ball and the seat (D) of the intake valve for wear or damage.

3.Using a pipe wrench, remove the intake housing (7) from the cylinder (2).

NOTE: These instructions are written with the pump separating at joint A. If it separates at joint B, disas- semble it at that joint, place the intake housing (7) in a vise, and continue with step 4.

4.Using a pipe wrench, unscrew the cylinder (2). The displacement rod (1) may come with the cylinder.

		D	5 3
	1	7
6	2
1			2
			30*
			13*
			2
			A
1			B

8

1 Torque to 325–353 NSm (240–260 ft-lb).

2 Lubricate.

3 Torque to 190–217 NSm (140–160 ft-lb).

04492A

Fig. 5

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