BOOM GRT880 SERVICE MANUAL
4-30
Published 10/19/2017, Control # 618-00
1. Position telescope cylinder #1 (502) up side down on
adequate supports. Ensure vent plug (A) at rear of
cylinder #1 is facing downward (see Figure 4-56).
2. Install sheave head weldment (506) to front of telescope
cylinder #1 (502) using four bolts and washers (542,
529) (see Figure 4-57).
3. Install cylinder head sheave (509) into sheave head
weldment (506) and secure with sheave pin (516). Install
one plate (522) using two bolts and lock washers (535,
540) to each side of the sheave head weldment (506) to
secure sheave pin in place (see Figure 4-58).
4. Install grease hose (510) and fittings (525, 527) to
sheave pin (516) and sheave head weldment (506) (see
Figure 4-58).
Lube sheave pin and head sheave until grease extrudes
between head sheave and sheave head weldment.
Refer to SECTION 9 - Maintenance and Lubrication for
proper grease specification.
5. Install one wear pad (515) to each side of sheave head
weldment (506) using two bolts (524) (see Figure 4-59).
6. Install five extend cables (6) around cylinder head
sheave (509), allowing the cables ends to hang
approximately 2-1/2 to 3 feet below cylinder head
sheave (509) (see Figure 4-60 and Figure 4-61). Evenly
layout the opposite end of cables on the floor alongside
FIGURE 4-58
9044-4
522
509
516
506
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Reference Only