Hitachi ZAXIS 135US-5B Operator's Manual page 407

Control Lever
Problem
Lever is heavy to operate
Does not move smoothly
Does Not Return to Neutral
The lever is tilted in the neutral position
due to increase in play
TROUBLESHOOTING
Cause
Rusted joint
Worn pusher
Worn pusher
Faulty pilot valve
Faulty pilot valve
Worn joint
Faulty pilot valve
11-3
* Lubricate or repair
* Replace
* Repair or replace
* Replace
* Replace
* Repair or replace
* Replace
Items with * mark: Consult your nearest Hitachi dealer.
Solution