6-2 Published 4-23-2018 Control # 239-11
MAINTENANCE CHECKLIST NBT40 SERIES OPERATOR MANUAL
1. Engine oil level.
2. Hydraulic oil level.
3. Radiator coolant level.
4. Loose parts or damage to structures or welds.
5. Operation of lights, safety equipment and gauges.
6. Condition of tires and suspension.
7. Condition of hoist cable and end attachment for
corrosion, severe kinking, crushing, cutting, or slippage
of cable clamps or wedge socket.
8. Loose parts or damage to cable centering hook blocks.
9. Position of cable with guides and on sheaves.
10. Free turning of sheaves.
11. Lubrication as specified by the Lubrication, Section 5.
12. Evidence of oil leaks from hoses, gearboxes, or swivel.
13. Hand and foot controls for malfunction or incorrect
adjustment.
14. Truck parking brake operation.
15. Boom proportioning to insure that all boom sections
extend and retract equally.
16. All securing hardware such as cotter pins, snap rings,
hairpins, pin keepers, and capscrews for proper
installation.
17. Proper condition and operation of RCL and anti-two-
block systems to include the anti-two-block switch
weight and chain at the boom tip (and extension tip if
equipped), power cords, audible alarms, and indicator
lights on the console.
18. Proper operation of the load hook safety latch.
19. Hooks and latches for excessive wear, cracks or
damage from heat or chemicals.
20. Drain holes at rear of the first section of the boom are
clear of all obstructions.
21. All fasteners retaining the cable centering block are in
place and tight.
22. All safety covers for proper installation.
23. Boom lift and outrigger holding valves for proper
operation.
24. Hoist brake for proper operation at hoist capacity load.
25. Control and drive mechanisms for excessive wear and/
or contamination from lubricants, water or other foreign
matter.
Weekly Inspections
Check the following items:
1. Battery water level.
2. Tire pressure.
3. Lubrication as specified by the Lubrication, Section 5.
4. Torque the T-box mounting bolts during the first month of
operation and periodic inspections thereafter.
5. Torque the swing bearing mounting bolts during the first
month of operation and periodic inspections thereafter.
6. Torque the boom wear pad retaining bolts during first
month of operation, and monthly thereafter.
7. Check to see that this crane’s Operator’s Manual is with
the crane. If the manual is missing, obtain the serial
number of the crane and order an operator’s manual
immediately.
Monthly Inspections
Check the following items:
1. All cylinders and valves for improper operation or signs
of leaks.
2. Lubrication as specified by the Lubrication Points, page
5-5.
3. Load hook for cracks or having more than 15 percent
normal throat opening or 10 degree twist.
4. All structural members (boom, sub-base, frame, turret,
and outriggers) for bends, cracks, or broken members.
5. All welds for breaks or cracks.
6. All pins for proper installation.
7. All control, safety, and capacity placards for readability
and secure attachment.
8. Cable clip bolts above wedge socket at end of loadline
should be properly torqued, refer to the Service Manual.
9. All boom wear pad retaining bolts.
10. Boom extension cables for proper tension or evidence of
abnormal wear.
11. Sheaves and cable drums for wear and cracks.
12. Unwind the loadline and check according to cable
maintenance procedure.
Periodic/Annual Inspection
Check the following items:
1. All items listed under daily, weekly, and monthly
inspections.
2. Loose bolts and fasteners in all areas. Torque pin
retainer bolts.
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