Hitachi 1800 User Manual

•

Set of socket wrenches

•

Set of adjustable wrenches

•

24 in. adjustable wrench

•

Torque wrench

•

Thread lubricant

•

Anti-seize lubricant 222955

•

Loctite

®

 2760

™

 or equivalent

1.

Flush the pump, if possible. Stop the pump at the 
bottom of its stroke. Relieve the pressure, page 12.

2.

Disconnect the air or hydraulic hose. Plug all 
hydraulic hoses immediately, to prevent contamina-
tion of the hydraulic system. 

3.

Hold the fluid outlet fitting (AD) with a wrench to 
keep it from loosening while you disconnect the fluid 
hose. See F

4.

Unscrew the coupling nut (103) from the connecting 
rod adapter (105). Remove the coupling collars 
(104); do not to lose or drop them. See F

5.

Hold the tie rod flats with a wrench to keep the rods 
(106) from turning. Unscrew the nuts (107). Remove 
the lower (102).

6.

To service the lower, refer to manual 311825, sup-
plied. To service the air or hydraulic motor, refer to 
the separate motor manual, supplied.

Use at least two people when lifting, moving, or dis-
connecting the pump. If disconnecting the lower, be 
sure to securely brace the pump, or have two people 
hold it while another disconnects it.

Before disconnecting the lower (102) from the 
motor (101), be sure to note the relative position of 
the pump's fluid outlet to the air or hydraulic inlet of 
the motor. If the motor does not require servicing, 
leave it attached to its mounting.