Manitowoc Grove RT540E Service Maintenance Manual

BOOM RT540E SERVICE MANUAL
4-38 Published 4-20-2015, Control # 502-01
TELESCOPE CIRCUIT TROUBLESHOOTING
Table 4-3
SYMPTOM PROBABLE CAUSE SOLUTION
1. Erratic operation of
extending
telescoping
cylinder.
a. Low hydraulic oil level. a. Replenish hydraulic oil to proper level.
b. Damaged relief valves. b. Repair or replace relief valves.
c. Air in telescope cylinder. c. Bleed by lowering telescope cylinder
below horizontal.
d. Low engine rpm. d. Increase engine rpm to recommended
setting.
e. Lack of lubrication on boom sections. e. Properly lubricate all boom sections.
f. Extremely tight boom extension
sheaves.
f. Inspect and properly lubricate boom
extension sheaves.
g. Improper boom alignment caused from
side loading.
g. Reduce and properly hoist load.
h. Worn boom wear pads. h. Replace wear pads and properly
lubricate.
i. Distorted boom section. i. Replace distorted section.
j. Damaged telescope cylinder. j. Repair or replace cylinder.
k. Clogged, broken, or loose hydraulic
lines or fittings.
k. Clean, tighten, or replace lines or
fittings.
l. Damaged control valve. l. Repair or replace control valve.
2. Erratic operation of
retracting
telescoping
cylinder.
a. Low hydraulic oil level. a. Replenish hydraulic oil to proper level.
b. Damaged relief valve. b. Repair or replace relief valve.
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 lubric
ate.
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).
Reference Only

Manitowoc Grove RT540E Specifications

General

Brand	Manitowoc
Model	Grove RT540E
Category	Construction Equipment
Language	English