Hitachi 236464 manual Reassembly

Service

Reassembly

1.If it was necessary to remove the piston ball housing (9) from the displacement rod (1), clean the threads of the rod and the ball housing, and apply thread sealant. Screw the ball housing onto the rod, hand tight. Place the flats of the piston ball housing in a vise and torque the rod to 258–285 NSm (190–210ft-lb). See Fig. 9.

2.For standard displacement pump 236458, place the piston packings on the piston seat housing (10)

in the following order, with the lips of the v-pack- ings facing up: the female gland (4*), one PTFE r v-packing (18*), four leather v-packings (19*), and the male gland (3*). See the Piston Packing Detail in Fig. 9.

NOTE: To convert the pump to a different packing material, see page 24.

3.Place the flats of the piston seat housing (10) in a vise. Apply thread sealant to the threads of the piston seat housing. Place the ball (12*) on the seat. Screw the piston ball housing (9) onto the piston seat housing hand tight, then torque

to 258–285 NSm (190–210 ft-lb). See Fig. 7.

4.For standard displacement pump 236458, lubricate the throat packings and place them in the outlet housing (6) in the following order, with the lips of

the v-packings facing down: the male gland (3*), four leather v-packings (19*), one PTFErv-pack- ing (18*), and the female gland (4*). See the Throat Packing Detail in Fig. 9.

NOTE: To convert the pump to a different packing material, see page 24.

5.Lubricate the threads of the packing nut (8), and loosely install it in the outlet housing (6).

6.Lubricate the piston packings. Slide the displace- ment rod (1) and piston assembly down into the cylinder (2). The cylinder is symmetrical, so either end may face up. Use a rubber mallet to drive the rod into the cylinder, until the piston seat housing (10) is located in the middle of the cylin- der.

7.Install the seal (11*) on the top of the cylinder (2). Lubricate the seal and the top threads of the cylinder.

8.Place the outlet housing (6) in a vise, as shown in Fig. 8. Slide the displacement rod (1) up into the outlet housing, then screw the cylinder (2) into the outlet housing handtight. The threads will engage easily until the seal (11*) contacts the sealing surface of the outlet housing. The top of the rod will protrude from the packing nut (8).

6 1 2

5 3

7 1

11*

2

1

8	1	Torque to 325–353 NSm (240–260 ft-lb).
	2	Lubricate.
	3	Torque to 190–217 NSm (140–160 ft-lb).

05127

Fig. 8

18 308350