jcb JS160 User Manual

5 - 1
Fault finding
Section F Transmission
9803/6410
Section F
5 - 1
Issue 1
Traction Motor/Reduction Gear
Symptom
1 Motor does not start - no oil
pressure present.
2 Motor does not start - oil
pressure present.
3 Oil leakage from mating
surfaces.
4 Oil leakage from case.
5 Oil leakage from floating seal.
6 Oil leakage from hydraulic motor.
7 Slips down on slope.
Possible cause
a Low relief valve set pressure.
b Pump failure.
c Direction switching valve failure.
a Brake valve failure
b Hydraulic motor failure.
c Gear teeth are broken.
d Overloaded.
a Mating surface is scratched.
b Bolts loose.
a Plug is loose.
b Cracks caused by stone, etc.
a Sliding surface is worn.
b Seepage past ‘O’-ring.
a Mounting bolts loose.
b ‘O’-ring is damaged.
c Seal surface is scratched.
a Poor motor efficiency.
b Excessive leakage inside brake
valve.
c Parking brake spring broken.
d Parking brake friction plate worn
Remedy
Set correct pressure.
Check operation of services other
than travel. Repair pump if necessary.
Check spool for damage. Repair if
necessary.
If spool or valve is thermally seized,
repair or renew.
Check hydraulic oil and renew if
necessary.
Dismantle reduction gear and renew
broken parts.
Remove load.
Lap surfaces using wet stone or
emery paper.
Tighten bolts and recheck.
Tighten plug.
Dismantle reduction gear and renew
damaged parts.
Dismantle reduction gear and renew
damaged parts.
Dismantle reduction gear and renew
damaged parts.
Retighten bolt(s).
Renew ‘O’-ring.
Lap surface using wet stone or emery
paper.
Renew traction motor.
Renew brake valve and/or rear flange.
Renew spring.
Renew friction plate and/or other
plate.

jcb JS160 Specifications

General

Brand	jcb
Model	JS160
Category	Excavators
Language	English