BOOM RT9130E-2 SERVICE MANUAL
4-26 Published 11-22-2016, Control # 345-12
2. Erratic operation of
retracting
telescoping
cylinder.
a. Low hydraulic oil level. a. Check system for leaks. Make repairs
as needed. Fill reservoir.
b. Damaged relief valve. b. Repair or replace relief valve. Refer to
your Manitowoc Crane Care Parts
Manual.
c. Air in cylinder. c. Bleed by lowering telescoping cylinder
below horizontal and cycle telescope
cylinder.
d. Low engine rpm. d. Increase engine rpm to recommended
setting.
e. Lack of lubrication. e. Properly lubricate all boom sections.
f. Check valve malfunctioning. f. Repair or replace check valve.
g. Improper boom alignment caused from
side loading.
g. Reduce and properly hoist load.
h. Extremely tight boom retraction
sheave.
h. Inspect and properly lubricate.
i. Distorted boom section. i. Replace distorted section.
j. Worn boom wear pads. j. Replace wear pads and properly
lubricate.
k. Bent cylinder rod(s). k. Replace cylinder rod(s) and all cylinder
seals.
l. Scored cylinder barrel. l. Repair or replace cylinder barrel.
m. Damaged piston seals. m. Replace all cylinder seals.
n. Loose or damaged piston(s). n. Replace all seals and re-torque or
replace piston(s).
3. Telescope cylinder
will not extend.
a. Low hydraulic oil level. a. Check system for leaks. Make repairs
as needed. Fill reservoir.
b. Relief valve malfunctioning. b. Repair or replace relief valve.
c. Excessive load. c. Reduce load.
d. Clogged hose and fittings. d. Replace hose or fittings. Refer to your
Manitowoc Crane Care Parts Manual.
e. Broken valve spool. e. Replace valve.
f. Damaged piston seals. f. Replace a
ll cylinder seals.
g. Damaged piston(s). g. Replace piston(s) and all cylinder
seals.
h. Bent boom section(s). h. Replace damaged boom section(s).
i. Broken hydraulic pump coupling. i. Replace broken hydraulic pump
coupling.
j. Worn or damaged hydraulic pump
section.
j. Repair or replace pump section.
SYMPTOM PROBABLE CAUSE SOLUTION
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