Manitowoc Grove TMS700E Service And Maintenance Manual page 151

TMS700E SERVICE MANUAL
SYMPTOM
2. Erratic operation of
retracting
telescoping
cylinder.
3. Telescope cylinder
will not extend.
Grove
PROBABLE CAUSE
a. Low hydraulic oil level.
b. Damaged relief valve.
c. Air in cylinder.
d. Low engine rpm.
e. Lack of lubrication.
f. Check valve malfunctioning.
g. Improper boom alignment caused from
side loading.
h. Very tight boom retraction sheave.
i. Distorted boom section.
j. Worn boom wear pads.
k. Bent cylinder rod(s).
l. Scored cylinder barrel.
m. Damaged piston seals.
n. Loose or damaged piston(s).
a. Low hydraulic oil level.
b. Relief valve malfunctioning.
c. Excessive load.
d. Clogged hose and fittings.
e. Broken valve spool.
f. Damaged piston seals.
g. Damaged piston(s).
h. Bent boom section(s).
i. Broken hydraulic pump coupling.
j. Worn or damaged hydraulic pump
section.
Published 01-29-2015, Control # 512-01
SOLUTION
a. Check for leaks. Repair any found.
Replenish hydraulic oil to proper level.
b. Repair or replace relief valve.
c. Bleed by lowering telescoping cylinder
below horizontal and cycle telescope
cylinder.
d. Increase engine rpm to recommended
setting.
e. Properly lubricate all boom sections.
f. Repair or replace check valve.
g. Reduce and properly hoist load.
h. Inspect and properly lubricate.
i. Replace distorted section.
j. Replace wear pads and properly
lubricate.
k. Replace cylinder rod(s) and all cylinder
seals.
l. Repair or replace cylinder barrel.
m. Replace all cylinder seals.
n. Replace all seals and re-torque or
replace piston(s).
a. Check for leaks. Repair any found.
Replenish oil to proper level.
b. Repair or replace relief valve.
c. Reduce load.
d. Replace hose or fittings. (Refer to
Grove Parts Manual).
e. Replace valve.
f. Replace all cylinder seals.
g. Replace piston(s) and all cylinder
seals.
h. Replace damaged boom section(s).
i. Replace broken hydraulic
coupling.
j. Repair or replace pump section.
BOOM
4
pump
4-17