Manitowoc Grove GRT9165 Service Manual

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
compensation with that
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

Manitowoc Grove GRT9165 Specifications

General

Brand	Manitowoc
Model	Grove GRT9165
Category	Construction Equipment
Language	English