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8-23
GRT9165 SERVICE MANUAL
UNDERCARRIAGE
8
Published 10-01-2020 Control # 699-00
GROVE
2.
Sticking spool.
a.
Dirt in the system.
a.
Change oil and flush system.
b.
Flow in excess of valve rating.
b.
Limit flow through valve to that
recommended. Check pump output
and cylinder ratio.
c.
Pressure in excess of valve
rating.
c.
Check relief valve setting or pump
c o m p e n s a t i o n
w i t h
t h a t
recommended.
d.
Electrical failure.
d.
Check wiring and solenoids.
3.
External leakage.
a.
Damaged O-ring or quad
rings.
a.
Check for chipped packings and
replace.
b.
Damaged solenoid.
b.
Replace damaged parts.
4.
Solenoid failure.
a.
No current.
a.
Check power source of at least 85%
of coil rating.
b.
Damaged solenoid assembly.
b.
Replace solenoid.
c.
Short in solenoid.
c.
Replace coil.
d.
Loss of solenoid force.
d.
Decrease
time
of
solenoid
energization, decrease cycle rate.
5.
Outrigger jack cylinder slow
or erratic.
a.
Low in hydraulic oil.
a.
Check system for leaks. Make
repairs as needed. Fill reservoir.
b.
Damaged main relief valve.
b.
Repair or replace valve.
c.
Damaged holding valve seals.
c.
Replace holding valve seals.
d.
Bent cylinder rod.
d.
Replace cylinder rod and seals.
e.
Bent outrigger housing.
e.
Repair or replace outrigger housing.
f.
Excessive material on beams.
f.
Clean outrigger beams.
g.
Sticking solenoid valve spool.
g.
Repair or replace valve spool.
h.
Damaged wiring to solenoid.
h.
Repair or replace wiring.
i.
Directional selector switch
sticking.
i.
Clean or replace switch.
j.
Main
hydraulic
pump
cavitation.
j.
Replace or tighten hose and fittings.
k.
Worn or damaged hydraulic
pump section.
k.
Repair or replace pump section.
6.
Outrigger
jack
cylinder
retracts under load.
a.
Damaged piston seals.
a.
Replace all cylinder seals.
b.
Damaged holding valve seals.
b.
Replace seals.
c.
Damaged holding valve.
c.
Replace valve assembly.
d.
Scored cylinder barrel.
d.
Repair or replace cylinder.
e.
Cracked or damaged piston.
e.
Replace piston and all cylinder seals.
7.
Outrigger
jack
cylinder
extends while machine is
traveling.
a.
Damaged piston seals.
a.
Replace all cylinder seals.
b.
Scored cylinder barrel.
b.
Replace jack cylinder.
c.
Cracked or damaged piston.
c.
Replace piston and seals.
d.
Piston loose on cylinder rod.
d.
Replace seal and retorque.
Symptom
Probable Cause
Solution
Summary of Contents for Grove GRT9165
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