8-27
RT765E-2 SERVICE MANUAL UNDERCARRIAGE
Published 9-04-2014, Control # 422-08
Maintenance
Troubleshooting
Table 8-4
Symptom Probable Cause Solution
1. Slow or erratic operation of
outrigger extension
cylinders.
a. Damaged relief valve. a. Remove relief valve; clean or
replace.
b. Low hydraulic oil. b. Check system for leaks. Make
repairs as needed. Fill reservoir.
c. Sticking solenoid valve spool. c. Repair or replace valve spool.
d. Improper ground to base of
solenoid.
d. Ground properly.
e. Directional selector switch
sticking.
e. Clean or replace switch.
f. Collector ring dirty or glazed. f. Clean and deglaze collector ring.
g. Damaged wiring to solenoid. g. Replace wiring.
h. Weak brush springs on
collector ring.
h. Replace brush springs.
1. Slow or erratic operation of
outrigger extension
cylinders. (continued)
i. Damaged extension cylinder
(internal parts).
i. Remove extension cylinder and
repair as necessary.
j. Bent cylinder rods. j. Replace piston rods and seals.
k. Excessive material on
outrigger beams.
k. Clean outrigger beams.
l. Binding outrigger beam. l. Repair or replace outrigger beam.
m. Damaged outrigger valve. m. Repair or replace valve.
n. Damaged valve coil. n. Replace coil.
o. Main hydraulic pump
cavitation.
o. Replace or tighten hose or fitting.
Refer to your Manitowoc Crane Care
Parts Manual.
p. Partially shifted hydraulic
spool in selector valve or
manifolds.
p. Disassemble, clean, and polish
spool and valve housing with very
fine emery cloth (water paper).
q. Insufficient voltage for
operation of solenoid valve.
q. Solenoids require a minimum of 9.5
volts to energize. Check outrigger
wiring and electrical coupling
collector rings.
r. Damaged piston seals. r. Replace all cylinder seals.
s. Worn or damaged hydraulic
pump section.
s. Rep
air or replace
pump section.
t. Scored cylinder barrel. t. Repair or replace extension cylinder.
u. Cracked or damaged piston. u. Replace rod weld and all cylinder
seals.
Reference Only
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