BOOM RT9130E-2 SERVICE MANUAL
4-34 Published 11-22-2016, Control # 345-12
NOTE: Refer to Disassembly, page 2-69 for lift cylinder
disassembly and assembly procedures.
Maintenance not requiring removal of the cylinder
barrels, such as packing, may be performed
without removing the cylinders from the turntable.
However, all disassembly and assembly should be
conducted in a clean dust-free area.
Removal
1. Extend and set the outriggers and level the crane.
2. Elevate the boom slightly so that the lift cylinder is
extended approximately 1 ft (0.3 m).
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 capscrew and washer securing the lift
cylinder upper pivot shaft to the boom.
5. Remove the capscrew and locknut securing the lift
cylinder lower pivot shaft to the turntable.
6. Attach an adequate lifting/supporting device to the lift
cylinder.
7. Insert the pump lever (found in cab) into the hand pump
located on the left side of the boom. Turn the pump flow
control lever clockwise and pump the lever until the
upper lift cylinder pin is clear of the boom’s left side lift
cylinder attachment lug. The lift cylinder may need to be
raised or lowered to aid in the release of the lift cylinder
pivot shaft from the attachment lug. This can be done by
using the jack on the lift cylinder support.
8. Once the shaft is clear of the attachment lug, activate the
hydraulic system and retract the lift cylinder enough to
clear the attachment lugs.
9. Tag and disconnect all the hydraulic lines to the lift
cylinder. Cap or plug all openings with high pressure
fittings.
10. Pull the lower lift cylinder pivot shaft out far enough to
remove the lift cylinder.
11. Move the lift cylinder to a clean work area.
Disassembly and Assembly
Disassembly and assembly procedures of the lift cylinder
holding valve, and control valve are provided in Hydraulic
System, page 2-1.
Installation
NOTE: Refer to Figure 4-8 for lift cylinder and boom pivot
shaft installation.
1. Lubricate the lower lift cylinder pivot shaft and related
bushings in the lift cylinder barrel end and the turntable
weldment.
2. Attach an adequate lifting device to the lift cylinder and
position the cylinder over the attach fittings on the
turntable.
3. Lower the lift cylinder into the attach fittings on the
turntable and align the lift cylinder bushing with the
boom’s lift cylinder attachment lug holes.
NOTE: Install pivot shaft with tapped hole on the right side,
the side opposite the cab.
4. Pin the lift cylinder to the turntable attach fittings with the
lower lift cylinder pivot shaft. Secure shaft with the
capscrew and locknut. Torque the capscrew; refer to
6. Boom will not
lower.
a. Low hydraulic oil. a. Check system for leaks. Make repairs
as needed. Fill reservoir.
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.
Symptom Probable Cause Solution
DANGER
Crushing Hazard!
Ensure any blocking or cribbing used is capable of
supporting the boom.
DANGER
Crushing Hazard!
Ensure the lifting/supporting device is capable of
supporting the lift cylinder.
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