Hitachi Zaxis 17U-5A Operator's Manual page 235

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
* Mark: Consult your authorized Hitachi dealer.
Solution