Published 4-22-15, Control # 556-00 4-27
RT530E-2 SERVICE MANUAL BOOM
NOTE: Refer to Section 2 - HYDRAULIC AND
PRESSURE SETTINGS 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 0.3 m (1 ft). The lift cylinder is
521 kg (1149 lb).
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 bolt and washer securing the lift cylinder
upper pivot shaft to the boom.
5. Remove the bolt and locknut securing the lift cylinder
lower pivot shaft to the turntable.
6. Attach an adequate lifting/supporting device to the lift
cylinder being removed.
7. Remove the upper pivot shaft. Activate the hydraulic
system and retract the lift cylinder enough to clear the
upper attach point.
8. Tag and disconnect all the hydraulic lines to the cylinder.
Cap or plug all openings with high pressure fittings.
9. Pull the lower lift cylinder pivot shaft out far enough to
remove the cylinder.
10. 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 Section 2
under CYLINDERS and VALVES respectively.
Installation
1. Attach an adequate lifting device to the lift cylinder and
position the cylinder over the attach fitting on the
turntable.
2. Lower the lift cylinder into the attach fittings on the
turntable and align the lift cylinder bushing with the
attach fitting holes.
NOTE: Install lower pivot shaft (Figure 4-35) (Detail B) with
tapped hole on the right side, side opposite the
cab.
3. Install the lift cylinder lower pivot shaft and secure with
the bolt and locknut.
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 attach point on the boom.
Install the upper pivot shaft through the cylinder and
boom attach points. Shut down the engine.
6. Secure the upper pivot shaft with the bolt and washer.
7. Remove the lifting and supporting devices from the
boom and lift cylinders. Activate the hydraulic system
and check the lift cylinders for proper operation and any
leaks.
8. Lubricate the pivot shafts using grease fittings.
6. Boom will not
lower.
a. Low hydraulic oil. a. 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.
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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