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Hitachi 120-3 class User Manual

Hitachi 120-3 class
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TROUBLESHOOTING
11-11
HYDRAULIC SYSTEM
Problem Cause Solution
One Control Lever Does Not
Work
Relief valve pressure low See your authorized dealer.
Tube or hose damaged Repair or replace.
Hydraulic fittings loose Tighten.
Damaged O-rings in fittings Install new O-ring.
Hydraulic Pump See your authorized dealer.
Pilot valve See your authorized dealer.
Pilot lines Repair or replace.
One Cylinder Does Not Work Control valve spool damaged or
contaminated with dirt
See your authorized dealer.
Hydraulic lines damaged Repair or replace.
Fittings loose Tighten.
O-ring in fitting damaged Install new O-ring.
Pilot valve See your authorized dealer.
Pilot lines Repair or replace.
One Cylinder Does Not Work or
Has Little Power
Piston seals leaking See your authorized dealer.
Cylinder rod damaged See your authorized dealer.
Pilot lines Repair or replace.
Pilot valve See your authorized dealer.
Failed wiring harness See your authorized dealer.
Both Travel Motors Do Not
Work
Center joint failure See your authorized dealer.
One Travel Motor Does Not
Work
Travel motor See your authorized dealer.
Parking brake not releasing See your authorized dealer.
Pilot valve See your authorized dealer.
Pilot lines Repair or replace.
Travel is Not Smooth Track adjustment Adjust tension.
Track idler or rollers damaged See your authorized dealer.
Track frame bent See your authorized dealer.

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Hitachi 120-3 class Specifications

General IconGeneral
BrandHitachi
Model120-3 class
CategoryExcavators
LanguageEnglish

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