Grove Published 11-22-2016, Control # 345-12 4-27
RT9130E-2 SERVICE MANUAL BOOM
Removal and Installation
Removal and installation of the telescope cylinder from the
boom is described under disassembly and assembly of the
boom. Refer to Boom Maintenance, page 4-7.
Disassembly and Assembly
Disassembly and assembly procedures of the telescope
cylinder and control valve are provided in Hydraulic System,
page 2-1 under Cylinders and Valves respectively.
4. Telescope cylinder
will not retract.
a. Low hydraulic oil level. a. Check system for leaks. Make repairs
as needed. Fill reservoir.
b. Relief valve damaged. b. Repair or replace relief valve.
c. Excessive load. c. Reduce load. (Refer to load chart).
d. Inoperative check valve. d. Replace check valve.
e. Clogged hose and fittings. e. Replace hose or fittings. Refer to your
Manitowoc Crane Care Parts Manual.
f. Broken valve spool. f. Replace valve section.
g. Broken piston(s). g. Replace piston(s) and all cylinder
seals.
h. Damaged piston seals. h. Replace all cylinder seals.
i. Bent boom section(s). i. Replace damaged boom section(s).
j. Broken hydraulic pump coupling. j. Replace broken hydraulic pump
coupling.
k. Worn or damaged hydraulic pump. k. Repair or replace pump.
l. Broken hydraulic pump shaft. l. Replace pump shaft.
5. Center mid will not
extend.
a. Right side check valve blocked. a. Readjust, repair, or replace valve.
6. Center mid will not
retract.
a. Right side check valve closed. a. Readjust valve.
7. Outer mid will not
extend.
a. Left side check valve is closed. a. Readjust valve.
8. Center mid retracts
before outer mid.
a. Right side check valve is open or
hosed backwards.
a. Install hoses properly.
9. Outer mid extends
only a short
distance then
stops.
a. Left check valve is open or hosed
backwards.
a. Install hoses properly.
SYMPT
OM PROBABLE CAUSE SOLUTION
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