JLG 600SC_660SJC Service Manual - Manual (Page 235)

SECTION 7 - BOOM & PLATFORM
3121157 – JLG Lift – 7-9
16. When removing wire rope from fly boom section,
push the cable into fly boom. Route wire rope back
through holes in the side of the fly boom section.
Inspection
NOTE: When inspecting pins and bearings Ref. to Pins and
Composite Bearing Repair Guidelines in Section 2.
1. Inspect all sheaves (extend and retract wire ropes
and telescope cylinder) for excessive groove wear,
burrs or other damage. Replace sheaves as neces-
sary.
NOTE: To check the size, contour and amount of wear, a
groove gauge is used. Replace the sheave if worn as
shown in the following drawing.
2. Inspect extend and retract wire rope sheave bear-
ings for wear, scoring, or other damage, and for
ovality.
3. Inspect extend wire rope and retract wire rope
sheave pins for scoring, tapering and ovality.
Replace pins as necessary.
4. Inspect telescope cylinder sheave pin for scoring,
tapering and ovality. Replace pins as necessary.
5. Inspect boom pivot pin for wear, scoring, tapering
and ovality, or other damage. Replace pins as nec-
essary.
6. Inspect telescope cylinder attach point for scoring,
tapering and ovality. Replace pins as necessary.
7. Inspect upper lift cylinder attach pin for wear, scor-
ing, tapering and ovality, or other damage. Ensure
pin surfaces are protected prior to installation.
Replace pins as necessary.
8. Inspect inner diameter of boom pivot bushing for
scoring, distortion, wear, or other damage. Replace
bearing as necessary.
9. Inspect all wear pads for excessive wear or other
damage. Replace pads when worn to within 1/8 inch
(3.2 mm) of threaded insert.
Figure 7-12. Disassembly Wire Rope Routing Proce-
Figure 7-13. Dimension of Sheaves When New