8-6 Published 11-22-2016, Control # 345-12
UNDERCARRIAGE RT9130E-2 SERVICE MANUAL
Functional Check
A normal periodic functional check of the entire steering
system will generally be adequate to ensure satisfactory
service.
1. Check all fittings for leakage. An accumulation of moist,
black dirt is a good indication of leakage.
2. With the engine running at idle and at full throttle, and
with the machine standing still and moving, turn the
steering wheel through the full range of travel. Note any
speed irregularities and sticky sensation. This may
indicate dirt in the fluid. If the steering wheel continues to
rotate when started and released, a condition known as
motoring exists. This may also indicate dirty fluid in the
system.
3. Ensure the system has adequate power. If there is an
indication of hard steering, this can be caused by either
a reduced oil flow to the control valve or a reduced
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. Adequate oil pressure can
only be determined by connecting a pressure gauge
(3500 psi (24 MPa/240 bar) 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 2500 psi (17.2 MPa/172
bar).
3. Steering is erratic left and right. a. Hydraulic oil low. a. Refill hydraulic reservoir.
Refer to Lubrication, page 9-1.
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.
4. Noisy hydraulic pump caused by
cavitation.
a. Hydraulic oil low. a. Check system for leaks. Make
repairs as needed. Fill
reservoir.
b. Suction line plugged or too
small.
b. Clean line and check for size.
5. Hydraulic pump shaft seal
leakage.
a. Worn shaft seal.
NOTE: If replacing the shaft seal
does not stop leakage, the
pump should be
disassembled and checked
for the following:
a. Replace shaft seal. Refer to
your Manitowoc Crane Care
Parts Manual.
b. Broken diaphragm seal or
backup gasket.
b. Replace seal or gasket.
c. Bearing out of position. c. Replace bearing.
d. Excessive internal wear. d. Replace pump.
Symptom Probable Cause Solution
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