Hitachi Zaxis 33U-5A Operator's Manual page 280

Drive Function
Problem
One or both side tracks are inoperable. Damaged center joint
Does not travel smoothly.
Travel speed does not change.
TROUBLESHOOTING
Cause
Incompletely released parking brake
Broken travel motor
Faulty pilot valve
Faulty pilot circuit line
Faulty counter balance valve
Overly tensioned or slackened crawler sag
Deformed track frame
Embedded foreign matter such as rock
fragments
Dragged parking brake
Faulty counter balance valve
Faulty travel speed switch.
Poor contact in connector
Damaged wire harness
Faulty solenoid valve
Faulty motor
11-6
* Repair or replace
* Repair or replace
* Repair or replace
* Replace
* Repair or replace
* Replace
Adjust
* Repair or replace
Remove
* Repair
* Replace
* Replace
* Repair or replace
* Repair
* Repair or replace
* Repair or replace
* Mark: Consult your authorized Hitachi dealer.
Solution