4-49
Published 10/19/2017, Control # 618-00
GRT880 SERVICE MANUAL BOOM
106.Install six bolts (134) and washers (119) through left and
right sides of base (101) and into the plates (513) (see
Figure 4-129). Tighten all bolts to 1800 Nm (1325 ft-lb).
107.Slightly tighten the two retract cables (7) using the nuts
(8) at the front of tele 3 (401). Tighten enough to remove
any slack in the cables.
108.Using adequate and suitable lifting device, roll boom
assembly 180°, to its right-side up position.
109.Install valve bracket, valves, and fittings that were
removed during disassembly. Install all hydraulic tubes
as tagged during disassembly (see Figure 4-130).
BOOM INSTALLATION
NOTE: The following procedure applies to a boom totally
removed from the crane.
NOTE: Boom weighs approximately 10,660 kg (23,500 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 shafts to
the superstructure assembly.
3. Lubricate and install the boom pivot shafts. Secure each
pivot shaft in place with the washer and capscrew on
one side and wear pads, washer, and capscrew on the
opposite side.
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. Install the upper pivot shaft through the cylinder and
boom attach points, inserting the spacers and shims as
noted during disassembly. Shut down the engine (see
Figure 4-131).
8. Install end plate, washers, and capscrews which secure
upper pivot shaft to the side of the attachment fitting on
the boom.
FIGURE 4- 129
9044-73
134119
101
513
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.
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