NBT60L OPERATOR MANUAL CONTROLS AND OPERATING PROCEDURES
NATIONAL CRANE Published 09-06-2019 Control # 691-01 3-23
which may have crept down or up and any signs of
damage or improper maintenance.
• The tires are inflated to the proper pressure.
• The level of the hydraulic reservoir oil.
• The operation of the “E-stop” and horn circuits.
• For missing and loose bolts.
• For damaged structural members and welds.
• All rope guides and rope keepers.
• All sheaves for free turning.
• The hoist rope for kinks, broken strands or other
damage in accordance with instructions under the
section Hoist Rope Inspection And Maintenance, page
6-3.
• To see that the hydraulic hoses and fittings are in good
condition and show no signs of leaking. The hoses
should be free from cuts and abrasions and there should
be no evidence of binding. Any damage or leakage
should be repaired immediately.
• The RCL and anti-two-block system for proper
operation.
• The electrical wiring connecting the various parts of the
system for physical damage.
NOTE: Consult the truck manufacturer’s manual for
vehicle checks.
For a complete list of inspections, see “Crane Inspection And
Maintenance” on page 6-1.
Cold Weather Operation
The following recommendations are for operating National
Cranes in very low (i.e., sub-zero) temperatures.
Cranes should have appropriate hydraulic oil, lubricants, and
other auxiliary items required for operation in sub-zero
temperatures. Operate individual crane functions to ensure
they are sufficiently warmed prior to performing a lift.
Operation of cranes at full rated capacities in temperatures
between -9°C (15°F) and -40°C (-40°F) or lower should be
accomplished only by competent operators who possess the
skill, experience, and dexterity to ensure smooth operation.
Shock loading shall be avoided.
Operation Below -40°C
For crane operation below -40°C, capacities shall be derated
3.67 percent of the rated load shown on the capacity charts
for each degree Celsius below -40°C.
Operation Below -40°F
For crane operation below -40°F, capacities shall be derated
2 percent of the rated load shown on the capacity charts for
each degree Fahrenheit below -40°F.
CRANE WARM-UP PROCEDURES
The following procedures detail the actions that must be
taken to properly warm the different crane components
before operating the crane.
NOTE: For temperatures below -9°C (15°F) refer to arctic
lubricants and conditions in the Operator and
Service Manuals.
Before starting the crane, ensure the appropriate lubricants
are used to provide lubrication for the prevailing ambient
temperatures in which the crane will operate in (a list of
lubricants and their temperature ranges can be found in the
Lubrication section of your crane’s Operator Manual, by
contacting your local National Crane distributor, or by
contacting Manitowoc Crane Care directly).
Engine
NOTE: For National Crane engine warm-up procedures,
refer to chassis manufacturer’s manual.
Warm-up Procedures for All Temperature Ranges:
1. Upon startup, allow the engine to idle for 3 to 5 minutes
before operating with a load.
2. Cold Engine Startup: After allowing the engine to warm
by idling it for 3 to 5 minutes, slowly increase the engine
speed to provide adequate lubrication to the bearings
and to allow the oil pressure to stabilize.
Transmission
NOTE: For National Crane transmission warm-up
procedures, refer to chassis manufacturer’s
manual.
CAUTION
Crane Damage Hazard!
Operating the crane with the incorrect lubricants and
fluids for the prevailing ambient temperature and/or failing
to adequately warm the crane prior to cold weather
operation can lead to a failure of a crane component or
system.
Always use National Crane recommended lubricants and
fluids for the prevailing ambient temperature and properly
start and warm the crane using the cold weather
procedures found in this Operator Manual before
operating the crane at full load.
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