Hitachi 312350E Manuel D’Utilisation

. 13 for steps 1-10, except where noted.

1.

If possible, flush pump. Relieve pressure, page 7.

2.

Follow instruction for Disconnecting the Recipro-
cator and Displacement Pump, page 11.

3.

Clamp pump in vise. 

4.

Use strap wrench to screw shovel tube (117) off 
pump cylinder (109).

5.

Use wrench to screw shovel (116) off of shovel rod 
(108).

6.

Use strap wrench on pump cylinder (109) to screw it 
out of extension tube (114). Screw tube connector 
(113) out of pump cylinder. Remove bearing (111†) 
and seal (112†).

7.

Screw the shovel rod (108) out of the piston (101). 
Remove lower ball (106†). Screw piston out of 
extension rod (107). Remove upper ball (106†), 
retaining washer (103) and seal (104†).

8.

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

9.

Generously lubricate all parts with light, water-resis-
tant grease and reassemble pump. See provided 
notes on F

. 13 for torque values.

•

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

•

Displacement Pump Repair Kit 241623 is avail-
able. Parts included in the kit are marked with a 
dagger (†) symbol in the parts drawing and list, 
page 20.

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

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