Manitowoc Grove RT770E Service Maintenance Manual

8-29
RT770E UNDERCARRIAGE
8
Published 11/26/2014, Control # 447-05
GROVE
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.
8. Outrigger system will not
activate (from stowed or
extended and down
position).
a. Hydraulic oil low. a. Check system for leaks. Make
repairs as needed. Fill reservoir.
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.
9. 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.
10. Outriggers will not set. a. Improper sequence of
activation.
a. Activate individual cont
rol switch;
then activate system control switch.
11. Two outriggers activate
from single control switch
a. Damaged solenoid valves. a. Repair or replace.
12. The two outriggers will not
stow.
a. Hydraulic lock. a. Recycle individual outrigger(s).
13. 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

Manitowoc Grove RT770E Specifications

General

Brand	Manitowoc
Model	Grove RT770E
Category	Construction Equipment
Language	English