JLG 642 Operation & Safety Manual page 41

1. Boom Sections and Lift, Tilt, Extend/Retract, Compensating Cylinders—
• Check front, top, side and rear wear pads for presence of grease.
• Pivot pins secure; hydraulic hoses undamaged, not leaking.
2. Left Outrigger (if equipped)—Pins secure; hydraulic hoses and cylinder undamaged,
not leaking.
3. Front Axle—Steer cylinders undamaged, not leaking; pivot pins secure; hydraulic
hoses undamaged, not leaking.
4. Wheel/Tire Assembly—Properly inflated and secured; no loose or missing lug nuts.
Inspect for worn tread, cuts, tears or other discrepancies.
5. Mirrors—Clean and undamaged.
6. Cab and Electrical—
• General appearance; no visible damage
• Frame level indicator(s) and window glass undamaged and clean
• Gauges, switches, joystick, foot controls and horn operational
• Check seat belt for damage, replace belt if frayed or cut webbing, damaged
buckles or loose mounting hardware
7. Wheel/Tire Assembly—Properly inflated and secured; no loose or missing lug nuts.
Inspect for worn tread, cuts, tears or other discrepancies.
8. Rear Axle Stabilizer Cylinder—Pins secure; hydraulic hoses undamaged, not leaking.
9. Wheel/Tire Assembly—Properly inflated and secured; no loose or missing lug nuts.
Inspect for worn tread, cuts, tears or other discrepancies.
10. Rear Axle—Steer cylinders undamaged, not leaking; pivot pins secure; hydraulic
hoses undamaged, not leaking.
11. Engine Compartment—
• Drive belts, check condition and replace as required.
• Engine mounts—See inspection note.
• Power Distribution Plate—No damage or corrosion on connections or wiring.
• Engine cover properly secured.
12. Mirrors—Clean and undamaged.
13. Wheel/Tire Assembly—Properly inflated and secured; no loose or missing lug nuts.
Inspect for worn tread, cuts, tears or other discrepancies.
14. Frame Level Cylinder—Pins secure; hydraulic hoses undamaged,
not leaking.
15. Right Outrigger (if equipped)—Pins secure; hydraulic hoses and cylinder
undamaged, not leaking.
16. Attachment—Properly installed, see "Attachment Installation" on page 5-9.
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Section 2—Pre-Operation and Inspection
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