Grove Published 11-10-2014, Control # 524-00 8-29
RT880E SERVICE MANUAL UNDERCARRIAGE
3. Sticking spool. a. Dirt in the system. a. Change oil and flush system.
b. Distortion caused by tie bolts
being overtorqued.
b. Retorque tie bolts.
c. Flow in excess of valve rating. c. Limit flow through valve to that
recommended. Check pump
output and cylinder ratio.
d. Pressure in excess of valve
rating.
a. Check relief valve setting or
pump compensation with that
recommended.
e. Electrical failure. b. Check wiring and solenoids.
4. External leakage. a. Damaged O-ring or quad
rings.
a. Check for chipped packings
and replace.
b. Loose tie bolts. b. Retorque tie bolts.
c. Damaged solenoid. c. Replace damaged parts.
5. 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.
6. Outrigger jack cylinder slow or
erratic.
a. Low in hydraulic oil. a. Replenish oil to proper level.
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. W
eak brush springs on
collector rings.
i. Replace brush springs.
j. Collector ring dirty or glazed. j. Clean or deglaze collector
ring.
k. Directional selector switch
sticking.
k. Clean or replace switch.
l. Main hydraulic pump
cavitation.
l. Replace or tighten hose and
fittings.
m. Worn or damaged hydraulic
pump section.
m. Repair or replace pump
section.
Symptom Probable Cause Solution
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