Rear Steering System; Troubleshooting - Manitowoc Grove RT765E-2 Service And Maintenance Manual

RT765E-2 SERVICE MANUAL
system relief pressure. Adequate oil flow under all
conditions can best be checked by timing the full travel
of the cylinder with the steered axle unloaded and
loaded. If there is a great difference at low engine speed
and slight difference at high engine speeds this may
indicate a defective pump drive. Adequate oil pressure
can only be determined by connecting a pressure gauge
(3500 psi (24 MPa) full scale recommended) at the
swing control valve bank pressure gauge test port. With
the engine running at a medium speed, turn the steering
wheel to one end of the travel and hold the cylinders at

REAR STEERING SYSTEM

Troubleshooting

Table 8-2
Symptom
1. Rear steering
inoperative.
2. Hard to steer left and
right.
3. Steering is erratic left
and right.
GROVE
Probable Cause
a. Hydraulic oil low.
b. Clogged, broken,
hydraulic lines or fittings.
c. Steer cylinder locked.
d. Defective control valve.
e. Defective steer cylinder(s).
f. Lack of electrical signal
a. Hydraulic oil low.
b. Clogged or loose hydraulic lines or
fittings.
c. Defective steering control valve.
d. Defective hydraulic pump.
e. Clogged or loose hydraulic lines or
fittings.
f. Defective steer cylinder.
g. Damaged relief.
a. Hydraulic oil low.
b. Clogged or loose hydraulic lines or
fittings.
c. Defective steering control valve.
d. Defective hydraulic pump.
Published 9-04-2014, Control # 422-08
the travel limit briefly, just long enough to read the
pressure gauge. Never hold the system at relief
pressure for more than a few seconds at a time. The
pressure gauge should indicate 3000 psi (20 MPa).
Secondary Steering System
Refer to H y dra uli c S ys te m, pag e 2 -1 fo r c hec king
accumulator pre-charge pressure and for pre-charging
accumulator using the steering control valve to discharge the
accumulator pressure.
a. Check system for leaks. Make
repairs as needed. Fill reservoir.
or loose b. Clean, tighten, or replace lines or
fittings.
c. Repair or replace cylinders.
d. Repair or replace valve.
e. Repair or replace cylinder(s).
f. Check electrical connections/wiring
a. Check system for leaks. Make
repairs as needed. Fill reservoir.
b. Clean or tighten lines or
fittings.
c. Repair or replace valve.
d. Repair or replace pump.
e. Clean or tighten lines or
fittings.
f. Repair or replace cylinder.
g. Replace relief valve.
a. Check system for leaks. Make
repairs as needed. Fill reservoir.
b. Clean or tighten lines or
fittings.
c. Repair or replace valve.
d. Repair or replace pump.
UNDERCARRIAGE
Solution
8-9
8