4-19
TMS800E SERVICE MANUAL BOOM
Published 01-29-2014, Control # 496-00
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 in this Section.
Disassembly and Assembly
Disassembly and assembly procedures of the telescope
cylinder and control valve are provided in Cylinders, page 2-
54 and Valves, page 2-22.
4. Telescope cylinder
will not retract.
a. Low hydraulic oil level. a. Check for leaks. Repair any found.
Replenish oil to proper level.
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.
m. Lack of electric control signal. m. Replace control signal.
5. Tele 1 will not
extend.
a. Right side check valve blocked. a. Readjust, repair, or replace valve.
6. Tele 1 will not
retract.
a. Right side check valve closed. a. Readjust valve.
7. Tele 2 will not
extend.
a. Left side check valve is closed. a. Readjust valve.
8. Tele 1 retracts
before tele 2.
a. Right side check valve is open or
hosed backwards.
a. Install hoses properly.
9. Tele 2 extends only
a short distance
then stops.
a. Left check valve is open or hosed
backwards.
a. Inst
all hoses
properly.
SYMPTOM PROBABLE CAUSE SOLUTION
Reference Only
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