4-45
Published 3/26/2018, Control # 596-05
GRT8100 SERVICE MANUAL BOOM
125.Install all hydraulic tube assemblies to tele stage
selection manifold (39) and telescope cylinder (6) as tag
during disassembly. Replace all O-rings.
126.Once boom assembly is positioned right-side up, adjust
top front wear pads (19, 46, 78, 100) of each boom tele
section using upper and side adjustment bolts (22).
Adjust wear pads so that they are just touching or are no
more than 2 mm (0.08 in) away from contacting the next
inner tele section. Tighten all jam nuts.
Installation
NOTE: The following procedure applies to a boom totally
removed from the crane.
NOTE: Boom weighs approximately 12,500 kg (27,550 lb).
1. Attach an adequate lifting device to the boom and
suspend the boom over the machine.
2. Lower the boom into position and align the boom pivot
shaft mounting holes for installation of the pivot shaft to
the superstructure assembly.
3. Lubricate and install the boom pivot shaft. Secure in
place with the locknut and capscrew. Install the grease
fitting in each end of the shaft.
4. Block the boom in place.
5. Attach a suitable lifting device to the lift cylinder.
6. Using the lifting device attached to the boom, lower the
boom onto the lift cylinder rod end and extend the lift
cylinder as necessary to align rod with attach fitting on
boom.
7. Lubricate and install the upper lift cylinder shaft. Install a
thrust washer on each side of the lift cylinder rod end.
Secure in place with the stop plate, two bolts, and two
washers.
8. Remove the boom lifting device.
9. Activate the hydraulic system and remove the boom and
lift cylinder blocking devices. Lower the boom to
horizontal. Shut down the crane.
10. Connect the hydraulic lines to the telescope cylinder as
tagged prior to removal.
NOTE: There should be a space of 6mm (0.24 in.)
between the boom proximity switch on the boom
base section and the weld nut on tele 1.
There should be a space of 6mm (0.24 in.)
between the boom proximity switch on tele 1 and
the weld nut on tele 2.
11. Connect any electrical wires as tagged prior to removal.
12. Refer to Boom Extension and Retraction Cable, page 4-
46 for cable adjustments.
Functional Check
1. Activate the hydraulic system and check for proper
operation and any leaks.
2. Ensure the boom will extend and retract properly.
3. Ensure the lift cylinder will not allow the boom to drift
down until the operator lowers it.
4. Ensure all electrical components disconnected during
removal are operating properly.
Inspection
Visually inspect telescoping sections for adequate lubrication
of all wear surfaces. Observe extended sections for
evidence of cracks, warping, or other damage. Periodically
check security of boom wear pads. Check boom nose
sheaves for security and freedom of movement.
DANGER
Ensure the lifting device is capable of supporting the
boom assembly. Death or serious injury may result if the
lifting device cannot support the load.
DANGER
Block the boom before doing any work under the boom.
Failure to properly support the boom may result in death
or serious injury.
DANGER
Failure to properly support the boom lift cylinder may
result in death or serious injury.
DANGER
If the hydraulic system must be activated to extend or
retract the lift cylinder, ensure the rod end is properly
aligned with the lift cylinder attach fitting.
CAUTION
If removed, ensure the large access covers on each side
of the boom base section are installed before extending
the boom. Boom damage could occur.
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