Manitowoc Grove RT540E Service Maintenance Manual

BOOM RT540E SERVICE MANUAL
4-40 Published 4-20-2015, Control # 502-01
LIFT CIRCUIT TROUBLESHOOTING
Table 4-4
Symptom Probable Cause Solution
1. Boom raises
erratically.
a. Low hydraulic oil. a. Replenish hydraulic oil to proper level.
b. Low engine rpm. b. Increase engine rpm to recommended
setting.
c. Main relief valve damaged. c. Replace relief valve.
d. Air in cylinder rod. d. Bleed cylinder rod.
e. Bent boom pivot shaft. e. Replace pivot shaft.
2. Boom lowers
erratically.
a. Low hydraulic oil. a. Replenish hydraulic oil to proper oil
level.
b. Low engine rpm. b. Increase engine rpm to recommended
level.
c. Circuit and/or relief valve inoperative. c. Repair or replace relief valve.
d. Air in hydraulic cylinder. d. Bleed air from cylinder.
e. Damaged hydraulic pump section. e. Repair or replace pump section.
3. Boom raises
slowly.
a. Low hydraulic oil level. a. Replenish hydraulic oil to proper level.
b. Low engine rpm. b. Increase and maintain engine rpm.
c. Damaged relief valve. c. Repair or replace relief valve.
d. Extremely cold hydraulic oil. d. Operate unit to bring oil to operating
temperature.
e. Improper hose or fittings, installed. e. Replace hose or fittings. (Refer to
Manitowoc Crane Care Parts Manual).
f. Operating two functions with in the
same control valve bank assembly.
f. Feather controls to obtain desired
speed of both functions.
g. Restriction in return hose. g. Replace return hose.
h. Cylinder piston seals leaking. h. Replace all cylinder seals.
i. Scored cylinder barrel. i. Hone or replace barrel.
j. Worn hydraulic pump section. j. Repair or replace pump section.
4. Boom lowers
slowly.
a. L
ow hydraulic oil level. a. Replenish
hydraulic oil to proper level.
b. Low engine rpm. b. Increase rpm to recommended level.
c. Damaged relief valve. c. Repair or replace relief valve.
d. Operating two functions within the
same control valve bank assembly.
d. Feather controls to obtain desired
speed of both functions.
e. Extremely cold hydraulic oil. e. Operate unit to bring oil to operating
temperature.
f. Improper hose or fittings installed. f. Replace hose or fittings. (Refer to
Manitowoc Crane Care Parts Manual).
g. Restriction in return hose. g. Replace return hose.
h. Cylinder piston seals worn. h. Replace all cylinder seals.
i. Scored cylinder barrel. i. Hone or replace barrel.
Reference Only

Manitowoc Grove RT540E Specifications

General

Brand	Manitowoc
Model	Grove RT540E
Category	Construction Equipment
Language	English