4-22
Published 01-29-2014, Control # 496-00
BOOM TMS800E SERVICE MANUAL
NOTE: Refer to Section 2 for Lift Cylinder Disassembly
and Assembly procedures. Maintenance not
requiring removal of the cylinder barrels, such as
packing, may be performed without removing the
cylinder from the turntable. However, all
disassembly and assembly should be conducted in
a clean dust-free area.
Lift Cylinder Removal
1. Extend and set the outriggers and level the crane.
2. Elevate the boom slightly so that the lift cylinder is
extended approximately 0.3 m (1 ft).
3. Ensure the boom is fully supported by placing blocking
or cribbing under the boom. Rest the boom on the
blocking or cribbing.
4. Remove the four M10 capscrews to free the end plate
from the lift cylinder upper pivot shaft. Remove the M20
capscrew and washer to free the end plate from the
boom (Figure 4-2).
5. Attach an adequate lifting/supporting device to the lift
cylinder.
6. Remove the lift cylinder upper pivot shaft. Activate the
hydraulic system and retract the lift cylinder enough to
clear the boom’s lift cylinder attach lugs.
7. Tag and disconnect all the hydraulic lines to the cylinder.
Cap or plug all openings with high pressure fittings.
8. Remove the bolt and locknut securing the lift cylinder
lower pivot shaft to the turntable.
9. Remove the lift cylinder lower pivot shaft from the lift
cylinder attach lugs on the turntable. Save the shim.
Remove the lift cylinder.
10. Move the lift cylinder to a clean work area.
Lift Cylinder Disassembly and Assembly
Disassembly and assembly procedures of the lift cylinder
holding valve, and control valve are provided in Section 2
under Cylinders, page 2-54 and Valves, page 2-22
respectively.
Lift Cylinder Installation
1. Attach an adequate lifting device to the lift cylinder and
place the cylinder barrel end between the lift cylinder
attach lugs on the turntable.
2. Align the lift cylinder barrel end bushing with the attach
lug holes on the turntable.
3. Apply antiseize compound (Spec. 6829003689) to the lift
cylinder lower pivot shaft. Install the pivot shaft into the
attach lug holes so its tapped hole is on the right side,
the side opposite the cab. Before driving the pivot shaft
through the left side lug hole, put the shim in place on
the left side. (In some instances the shim could be on the
right side.) Secure the pivot shaft with the bolt and new
locknut (Figure 4-2). Torque the bolt, refer to Fasteners
and Torque Values, page 1-13.
4. Connect the extend and retract hoses to the lift cylinder.
5. Activate the crane’s hydraulic system and align the lift
cylinder rod end with the lift cylinder attach lugs on the
boom.
6. Apply antiseize compound (Spec. 6829003689) to the lift
cylinder upper pivot shaft. Install the pivot shaft into the
attach lug holes so its tapped holes are on the left side.
6. Boom will not
lower.
a. Low hydraulic oil. a. Check for leaks. Repair any found.
Replenish hydraulic oil to proper level.
b. Main relief valve or circuit relief valve
damaged.
b. Repair or replace relief valve.
c. Worn or damaged hydraulic pump
section.
c. Repair or replace pump section.
d. Broken pump shaft. d. Replace pump shaft and seals.
e. Broken pump drive coupling. e. Replace drive coupling.
f. Broken control valve spool. f. Replace control valve.
g. Lack of electrical control signal. g. Replace control signal.
Symptom Probable Cause Solution
DANGER
Ensure any blocking or cribbing used is capable of
supporting the boom.
DANGER
Ensure the lifting/supporting device is capable of
supporting the lift cylinder.
Reference Only
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