JLG 600SC_660SJC Service Manual - Manual (Page 112)

SECTION 4 - BOOM & PLATFORM
4-10 – JLG Lift – 3121607
2. Inspect extend and retract wire rope sheave bearings for
wear, scoring or other damage, and 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, taper-
ing and ovality. Replace pins as necessary.
5. Inspect boom pivot pin for wear, scoring, tapering and
ovality, or other damage. Replace pins as necessary.
6. Inspect telescope cylinder attach point for scoring,
tapering and ovality. Replace pins as necessary.
7. Inspect upper lift cylinder attach pin for wear, scoring,
tapering and ovality, or other damage. Ensure pin sur-
faces are protected prior to installation. Replace pins as
necessary.
8. Inspect inner diameter of boom pivot bushing for scor-
ing, distortion, wear, or other damage. Replace bearing
as necessary.
9. Inspect all wear pads for excessive wear or other dam-
age. Replace pads when worn to within 1/8 inch (3.2
mm) of threaded insert.
10. Inspect extend and retract wire rope attach point com-
ponents for cracks, stretching, distortion, or other dam-
age. Replace components as necessary.
11. Inspect all threaded components for damage such as
stretching, thread deformation, or twisting. Replace as
necessary.
12. Inspect structural units of boom assembly for bending,
cracking, separation of welds, or other damage. Replace
boom sections as necessary.
Assembly
NOTE: Install same number and thickness of shims removed dur-
ing disassembly when installing fly section wear pads.
1. Measure inside dimensions of base and mid sections to
determine number of shims required for proper lift.
2. Measure inside dimensions of mid section to determine
number of shims required for proper lift.
3. Install side, top, and bottom wear pads to aft end of fly
section. Shim evenly to inside measurements of mid sec-
tion.
4. Install retract wire ropes in aft end of fly section. Route
wire ropes through holes in side of fly boom section and
pull into slot.
Figure 4-18. Routing Installation of Retract Wire Ropes
5. Install side, top, and bottom wear pads to aft end of mid
section. Shim evenly to mid section inside measure-
ments.
WHEN ASSEMBLING BOOM SECTIONS, ENSURE BOOM SLIDING TRAJECTORIES
ARE CLEAR OF CHAINS, TOOLS, AND OTHER OBSTRUCTIONS.
6. Shim insides of boom sections for a total of 1/16 inch
(0.062) clearance (if action is centered, there will be 1/32
inch clearance on each side).