Manitowoc Grove RT765E-2 Service And Maintenance Manual page 283

RT765E-2 SERVICE MANUAL
Symptom
6. Outrigger jack cylinder
retracts under load.
7. Outrigger jack cylinder
extends while machine is
traveling.
8. Outrigger system will not
activate (from stowed or
extended and
position).
9. Outrigger system activates,
but selected outrigger will
not stow or extend and
lower as desired.
10. Outriggers will not set.
11. Two outriggers activate
from single control switch
12. The two outriggers will not
stow.
13. Individual outrigger will not
set or stow.
GROVE
Probable Cause
a. Damaged piston seals.
b. Damaged holding valve seals.
c. Damaged holding valve.
d. Scored cylinder barrel.
e. Cracked or damaged piston.
a. Damaged piston seals.
b. Scored cylinder barrel.
c. Cracked or damaged piston.
d. Piston loose on cylinder rod.
a. Hydraulic oil low.
down
b. Loose or broken wire on
switch.
c. Clogged, broken, or loose
lines or fittings.
d. Damaged
damaged control valve.
a. Clogged, broken, or loose
hydraulic lines or fittings.
b. Loose or broken wire on
control switch or solenoid
valve.
c. Damaged solenoid valve.
d. Damaged control switch.
e. Damaged hydraulic cylinder.
a. Improper
activation.
a. Damaged solenoid valves.
a. Hydraulic lock.
a. Damaged piston seals.
b. Damaged check valve.
c. Loosen or broken wire on
control switch or solenoid
valve.
d. Damaged solenoid valve.
Published 9-04-2014, Control # 422-08
a.
b. Replace seals.
c.
d. Repair or replace cylinder.
e.
a.
b. Replace jack cylinder.
c.
d. Replace seal and retorque.
a.
b. Repair or replace wiring.
c.
relief valve or d. Repair or replace valve.
a.
b. Repair or replace wiring.
c.
d. Replace switch.
e.
sequence of a.
a.
a.
a.
b. Repair or replace valve.
c.
d. Repair or replace valve.
UNDERCARRIAGE
Solution
Replace all cylinder seals.
Replace valve assembly.
Replace piston and all cylinder seals.
Replace all cylinder seals.
Replace piston and seals.
Check system for leaks. Make
repairs as needed. Fill reservoir.
Clean, tighten, or replace lines or
fittings.
Clean, tighten, or replace lines or
fittings.
Repair or replace valve.
Repair or replace cylinder.
Activate individual control switch;
then activate system control switch.
Repair or replace.
Recycle individual outrigger(s).
Replace seals.
Repair or replace wiring.
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