Manitowoc Grove RT880E - Page 296

UNDERCARRIAGE RT880E SERVICE MANUAL
8-30 Published 11-10-2014, Control # 524-00
7. 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.
8. 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.
9. Outrigger system will not activate
(from stowed or extended and
down position).
a. Hydraulic oil low. a. Replenish system.
b. Loose or broken wire on
switch.
b. Repair or replace wiring.
c. Clogged, broken, or loose
lines or fittings.
c. Clean, tighten, or replace
lines or fittings.
d. Damaged relief valve or
damaged control valve.
d. Repair or replace valve.
10. Outrigger system activates, but
selected outrigger will not stow or
extend and lower as desired.
a. Clogged, broken, or loose
hydraulic lines or fittings.
a. Clean, tighten, or replace
lines or fittings.
b. Loose or broken wire on
control switch or solenoid
valve.
b. Repair or replace wiring.
c. Damaged solenoid valve. c. Repair or replace valve.
d. Damaged control switch. d. Replace switch.
e. Damaged hydraulic cylinder. e. Repair or replace cylinder.
11. Outriggers will not set. a. Improper sequence of
activation.
a. Activate individual control
switch;
then activate system
control switch.
12. Two outriggers activate from sin-
gle control switch.
a. Damaged solenoid valves. a. Repair or replace.
13. The two outriggers will not stow. a. Hydraulic lock. a. Recycle individual
outrigger(s).
14. Individual outrigger will not set or
stow.
a. Damaged piston seals. a. Replace seals.
b. Damaged check valve. b. Repair or replace valve.
c. Loosen or broken wire on
control switch or solenoid
valve.
c. Repair or replace wiring.
d. Damaged solenoid valve. d. Repair or replace valve.
Symptom Probable Cause Solution