Hitachi 312350E important safety instructions Reciprocator Repair

36, 37

31

38

32

43

	Reciprocator Repair
3, 39, 2	When reinstalling cylinder (25), Step 19, be sure

	port in valve spool (31) and port in the bottom
	cylinder cap (32) are in line with each other. Be
13*	sure o-rings (13*) are in place in valve spool and
	cylinder cap.

19. Place cylinder (25) on cylinder cap (32). Install pis- ton (22) and valve assembly (31).

20. Install o-ring (49*) in deep, lower groove of piston (22). Install seal (23*) over o-ring. Install piston bearing (24*) around upper groove of piston. Hold- ing piston bearing in place to avoid damage, slide

	25	cylinder over piston and press it down.
		21. Install capscrew (3), o-ring (39) and washer (2).
		Install lockwashers (37) and nuts (36). Torque nuts
		to 28 to 32 ft-lb (38 to 43 N.m).
13*		22. Reinstall fluid tube (45) and fittings (1). Torque fit-
		tings to 28 to 32 ft-lb (38 to 43 N.m). See Reciproca-
17
		tor Parts drawing, page 18.
20
		.
18		Make sure the displacement rod (35) on the
		assembled reciprocator is exposed so the pump
		can be connected to it.

35

204

35

ti10605a

FIG. 11

See FIG. 11 for steps 17- 24 except where noted.

17.Place adapter (43) in a vise. Install seals as described on page 10. Install cylinder cap (32).

18.If tie rods (38) were removed, reinstall them with short threaded end up. The other end should be screwed about 9/16” into bottom cylinder cap (32).

ti10610a

FIG. 12

23.To reconnect reciprocator and pump, install o-ring (17). Screw connecting rod (35) into displacement rod (34). Install cotter pin (204). Install a new gasket (202*). Push cylinder up into adapter and engage the threads. Screw in pump using a strap wrench for the final tightening (See FIG. 12 and Pump Parts, page 20).

24.Connect hydraulic supply and return hoses to fit- tings (5, 60).

To reduce risk of static sparking, be sure to recon- nect ground wire before operating pump.

312350E 15