Manitowoc Grove GRT8100 Service Manual

4-51
Published 3/26/2018, Control # 596-05
GRT8100 SERVICE MANUAL BOOM
4
GROVE
Removal And Installation
Removal and installation of the telescope cylinder from the
boom is described under disassembly and assembly of the
boom. Refer to Maintenance, page 4-4.
Disassembly And Assembly
Disassembly and assembly procedures of the telescope
control valve and cylinder are provided in Valves, page 2-39
and Cylinders, page 2-69 respectively.
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
Manitowoc Crane Care Parts Manual).
e. Broken valve spool. e. Replace valve.
f. Damaged piston seals. f. Replace all 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.
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
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.
SYMPTOM PROBABLE CAUSE SOLUTION

Manitowoc Grove GRT8100 Specifications

General

Brand	Manitowoc
Model	Grove GRT8100
Category	Construction Equipment
Language	English