6-4
Published 3/26/2018, Control # 596-05
SWING SYSTEM GRT8100 SERVICE MANUAL
MAINTENANCE
Table 6-1: Troubleshooting
Symptom Probable Cause Solution
1. Boom swing
operation erratic in
either direction.
a. Damaged relief valve. a. Replace relief valve.
b. Swing brake dragging (not releasing
properly).
b. Readjust and/or replace parts.
c. Low engine rpm. c. Increase engine rpm to obtain smooth
swing operation.
d. Low hydraulic oil. d. Check system for leaks. Make repairs as
needed. Fill reservoir.
e. Improper movement of control to neutral. e. Feather controls to neutral to maintain
smooth stopping action.
f. Insufficient lubricant on swing bearing. f. Lubricate bearing properly. Refer to
Lubrication, page 9-1.
g. Crane not level. g. Level crane using outriggers.
h. Damaged swing motor. h. Repair or replace swing motor.
i. Excessive overload. i. Reduce load. Refer to load capacity chart.
j. Restricted or partly clogged hydraulic
hose or fittings.
j. Replace hose or fittings. Refer to the
Manitowoc Crane Care Parts Manual.
k. Pump cavitation in swing section. k. Tighten suction hose or replace damaged
fittings. Check hydraulic tank level.
l. Improperly torqued turntable bolts. l. Torque turntable bolts evenly.
m. Excessive preload on upper and lower
pinion shaft bearing.
m. Adjust as necessary.
n. Improperly torqued swing motor
attachment bolts.
n. Torque swing motor attachment bolts.
o. Malfunction of the swing box. o. Remove swing box and make necessary
repairs.
p. Worn or damaged pump. p. Repair or replace damaged pump.
q. Damaged swing directional control valve. q. Repair or replace swing directional control
valve.
r. Damaged swing pinion. r. Replace pinion.
s. Damaged turntable bearing. s. Replace turntable bearing.
t. Controller settings t. Check settings
u. Electrical connection u.
Inspect wiring and connections
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