Maintenance - Manitowoc Grove TMS700E Service And Maintenance Manual

BOOM

Maintenance

Troubleshooting
Symptom
1. Boom raises
erratically.
2. Boom lowers
erratically.
3. Boom raises
slowly.
4-20
Probable Cause
a. Low hydraulic oil.
b. Low engine rpm.
c. Main relief valve damaged.
d. Air in cylinder rod.
e. Bent boom pivot shaft.
a. Low hydraulic oil.
b. Low engine rpm.
c. Circuit and/or relief valve inoperative.
d. Air in hydraulic cylinder.
e. Damaged hydraulic pump section.
a. Low hydraulic oil level.
b. Low engine rpm.
c. Damaged relief valve.
d. Extremely cold hydraulic oil.
e. Improper hose or fittings, installed.
f. Operating two functions within the
same control valve bank assembly.
g. Restriction in return hose.
h. Cylinder piston seals leaking.
i. Scored cylinder barrel.
j. Worn hydraulic pump section.
Published 01-29-2015, Control # 512-01
TMS700E SERVICE MANUAL
Solution
a. Check for leaks. Repair any found.
Replenish hydraulic oil to proper level.
b. Increase engine rpm to recommended
setting.
c. Replace relief valve.
d. Bleed cylinder rod.
e. Replace pivot shaft.
a. Check for leaks. Repair any found.
Replenish hydraulic oil to proper level.
b. Increase engine rpm to recommended
level.
c. Repair or replace relief valve.
d. Bleed air from cylinder.
e. Repair or replace pump section.
a. Check for leaks. Repair any found.
Replenish hydraulic oil to proper level.
b. Increase and maintain engine rpm.
c. Repair or replace relief valve.
d. Operate unit to bring oil to operating
temperature.
e. Replace hose or fittings. (Refer to
Grove Parts Manual).
f. Feather controls to obtain desired
speed of both functions.
g. Replace return hose.
h. Replace all cylinder seals.
i. Hone or replace barrel.
j. Repair or replace pump section.