Manitowoc Grove RT765E-2 Service And Maintenance Manual

8-9
RT765E-2 SERVICE MANUAL UNDERCARRIAGE
8
Published 9-04-2014, Control # 422-08
GROVE
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
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 Hydraulic System, page 2-1 for checking
accumulator pre-charge pressure and for pre-charging
accumulator using the steering control valve to discharge the
accumulator pressure.
REAR STEERING SYSTEM
Troubleshooting
Table 8-2
Symptom Probable Cause Solution
1. Rear steering
inoperative.
a. Hydraulic oil low. a. Check system for leaks. Make
repairs as needed. Fill reservoir.
b. Clogged, broken, or loose
hydraulic lines or fittings.
b. Clean, tighten, or replace lines or
fittings.
c. Steer cylinder locked. c. Repair or replace cylinders.
d. Defective control valve. d. Repair or replace valve.
e. Defective steer cylinder(s). e. Repair or replace cylinder(s).
f. Lack of electrical signal f. Check electrical connections/wiring
2. Hard to steer left and
right.
a. Hydraulic oil low. a. Check system for leaks. Make
repairs as needed. Fill reservoir.
b. Clogged or loose hydraulic lines or
fittings.
b. Clean or tighten lines or
fittings.
c. Defective steering control valve. c. Repair or replace valve.
d. Defective hydraulic pump. d. Repair or replace pump.
e. Clogged or loose hydraulic lines or
fittings.
e. Clean or tighten lines or
fittings.
f. Defective steer cylinder. f. Repair or replace cylinder.
g. Damaged relief. g. Replace relief valve.
3. Steering is erratic left
and right.
a. Hydraulic oil low. a. Check system for leaks. Make
repairs as needed. Fill reservoir.
b. Clogged or loose hydraulic lines or
fittings.
b. Clean or tighten lines or
fittings.
c. Defective steering control valve. c. Repair or replace valve.
d. Defective hydraulic pump. d. Repair or replace pump.
Reference Only

Manitowoc Grove RT765E-2 Specifications

General

Brand	Manitowoc
Model	Grove RT765E-2
Category	Construction Equipment
Language	English