Hitachi EX1900-5 Operator's Manual page 272

Problem
One Control Lever Does Not
Work
One Cylinder Does Not Work
One Cylinder Does Not Work
or Has Little Power
Both Travel Motors Do Not
Work
One Travel Motor Does Not
Work
Travel is Not Smooth
TROUBLESHOOTING
HYDRAULIC SYSTEM
Cause
Relief valve pressure low
Tube or hose damaged
Hydraulic fittings loose
Damaged O-rings in fittings
Hydraulic Pump
Pilot valve
Pilot lines
Control valve spool damaged or
contaminated with dirt
Hydraulic lines damaged
Fittings loose
O-ring in fitting damaged
Pilot valve
Pilot lines
Piston seals leaking
Cylinder rod damaged
Pilot lines
Pilot valve
Center joint failure
Travel motor
Parking brake not releasing
Pilot valve
Pilot lines
Track adjustment
Front idler or rollers damaged
Track frame bent
11-12
Solution
See your authorized dealer.
Repair or replace.
Tighten.
Install new O-ring.
See your authorized dealer.
See your authorized dealer.
Repair or replace.
See your authorized dealer.
Repair or replace.
Tighten.
Install new O-ring.
See your authorized dealer.
Repair or replace.
See your authorized dealer.
See your authorized dealer.
Repair or replace.
See your authorized dealer.
See your authorized dealer.
See your authorized dealer.
See your authorized dealer.
See your authorized dealer.
Repair or replace.
Adjust tension.
See your authorized dealer.
See your authorized dealer.