Published 4-20-2015, Control # 502-01 8-11
RT540E SERVICE MANUAL UNDERCARRIAGE
Maintenance
Front Steering System
Troubleshooting
Table 8-1
Symptom Probable Cause Solution
1. Hard to steer left and right. a. Hydraulic oil low. a. Refill hydraulic reservoir.
Refer to Section 9 -
LUBRICATION
b. Clogged or loose hydraulic
lines or fittings.
b. Clean or tighten lines or
fittings. (Refer to your
Manitowoc Crane Care Parts
Manual)
c. Defective flow divider
valve(s).
c. Repair or replace valve(s).
d. Defective steering control
valve.
d. Repair or replace valve.
e. Defective hydraulic pump. e. Repair or replace pump.
2. Hard to steer either left or right. a. Clogged or loose hydraulic
lines or fittings.
a. Clean or tighten lines or
fittings. Refer to Section 9 -
LUBRICATION
b. Defective steer cylinder. b. Repair or replace cylinder.
3. Steering is erratic left and right. a. Hydraulic oil low. a. Refill hydraulic reservoir.
Refer to Section 9 -
LUBRICATION.
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. Refill hydraulic reservoir.
Refer to Section 9 -
LUBRICATION
b. Suction line plugged or too
small.
b. Clean line and check for size.
5. Hydraulic pump shaft seal
leakage.
a. Worn shaft seal. a. Replace shaft seal.
NOTE: If replacing the shaft seal
does not stop leakage, the
pump should be
disassembled and checked
for the following:
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
.
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