Manitowoc Grove RT530E-2 Service And Maintenance Manual page 270

UNDERCARRIAGE
Symptom
S l o w o r e r r a t i c o p e r a t i o n o f
outrigger extension cylinders.
(continued)
2. Sticking spool.
3. External leakage.
4. Solenoid failure.
8-26
Probable Cause
q. Partially shifted hydraulic
spool in selector valve or
manifolds.
r. Insufficient voltage
operation of solenoid valve.
s. Damaged piston seals.
t. Worn or damaged hydraulic
pump section.
u. Scored cylinder barrel.
v. Cracked or damaged piston.
w. Piston loose on piston rod.
a. Dirt in the system.
b. Distortion caused by tie bolts
being overtorqued.
c. Flow in excess of valve rating.
d. Pressure in excess of valve
rating.
e. Electrical failure.
a. Damaged O-ring or quad
rings.
b. Loose tie bolts.
c. Damaged solenoid.
a. No current.
b. Damaged solenoid assembly.
c. Short in solenoid.
d. Loss of solenoid force.
Published 4-22-15, Control # 556-00
RT530E-2 SERVICE MANUAL
Solution
q. Disassemble,
p o l i s h s p o o l a n d v a l v e
housing with very fine emery
cloth (water paper).
for r. Solenoids require a minimum
of 9.5 volts to energize. Check
outrigger wiring and electrical
coupling collector rings.
s. Replace all cylinder seals.
t. Repair or
section.
u. Repair or replace extension
cylinder.
v. Replace rod weld and all
cylinder seals.
w. Replace all cylinder seals and
torque piston locknut.
a. Change oil and flush system.
b. Retorque tie bolts.
c. Limit flow through valve to that
recommended. Check pump
output and cylinder ratio.
d. Check relief valve setting or
pump compensation with that
recommended.
e. Check wiring and solenoids.
a. Check for chipped packings
and replace.
b. Retorque tie bolts.
c. Replace damaged parts.
a. Check power source of at
least 85% of coil rating.
b. Replace solenoid.
c. Replace coil.
d. Decrease time of solenoid
energization, decrease cycle
rate.
clean, and
replace pump