National Crane Published 4-23-2018 Control # 239-11 6-1
NBT40 SERIES OPERATOR MANUAL MAINTENANCE CHECKLIST
SECTION 6
MAINTENANCE CHECKLIST
SECTION CONTENTS
Crane Inspection And Maintenance . . . . . . . . . . . 6-1
Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Special Boom Inspection . . . . . . . . . . . . . . . . . . . . 6-3
Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Hoist Cable Inspection and Maintenance . . . . . . . 6-3
Keeping Records . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Environmental Conditions . . . . . . . . . . . . . . . . . . . 6-3
Dynamic Shock Loads. . . . . . . . . . . . . . . . . . . . . . 6-4
Precautions and Recommendations
During Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Wire Rope Replacement . . . . . . . . . . . . . . . . . . . . 6-5
Care of Wire Rope. . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Replacement Cable . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Crane Adjustments and Repairs . . . . . . . . . . . . . . 6-6
Boom Extension Cable . . . . . . . . . . . . . . . . . . . . . 6-6
Jib Jack Service and Maintenance. . . . . . . . . . . . . 6-6
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Rust Prevention . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Hydraulic System Trouble Diagnosis . . . . . . . . . . . 6-6
Tire Load And Inflation Table . . . . . . . . . . . . . . . . . 6-9
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Hydraulic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Air Conditioner . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Hoist System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Counterweight . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Boom Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Dimensional Drawing. . . . . . . . . . . . . . . . . . . . . . . 6-16
CRANE INSPECTION AND MAINTENANCE
Regularly scheduled inspection and maintenance intervals
are required to keep the crane in peak operating condition.
The following pages outline the inspection and maintenance
intervals.
Refer to the Service Manual for complete instructions on
performing maintenance on this crane.
Inspections
The inspection intervals listed below are to be conducted on
the unit to ensure safe and proper operation. Refer to the
Service Manual when installing missing or loose fasteners.
Should a defect be found, a determination must be made as
to whether the deficiency is a safety hazard or though not yet
a safety hazard, needs to be monitored in the monthly
inspections.
The inspections are separated into the following frequency
classifications:
• Daily inspections - performed by the operator at the start
of the day.
• Weekly inspections - performed by the operator.
• Monthly inspections - performed by maintenance
personnel.
• Periodic inspections - performed by maintenance
personnel at least every three months and includes all
items listed under daily, weekly, and monthly
inspections. Federal Laws through OSHA and ANSI
B30.5 require that dated and signed records of these
periodic inspections be kept. An inspection log book is
available from your National Crane distributor or
Manitowoc Crane Care.
Daily Inspections/Pre-use
Check the following items:
WARNING
Fall Hazard!
Do not, under any circumstances, work at an elevated
height without using proper fall protection as required by
local, state or federal regulations
WARNING
If any defect determined during the inspection is a safety
hazard the machine must be removed from service and
the defect corrected.
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