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Published 11-01-2020 Control # 710-00
SAFETY PRECAUTIONS
NBT60XL OPERATOR MANUAL
PARKING AND SECURING
When parking on a grade, apply the parking brake and chock
the wheels.
The Controls and Operating Procedures section of this
manual provides instructions for parking and securing the
equipment when it is to be left unattended. These
instructions are intended to allow the equipment to be placed
in the most stable and secure position. However, National
Crane recognizes that certain jobsite conditions may not
permit the boom and jib of the equipment to be fully lowered
to the ground. When a qualified person at a jobsite
determines that it is not practical to lower the boom to the
ground, we recommend the following additional instructions
be followed:
•
The equipment should be left in the smallest, most
stable, valid operational configuration that the job site
practically allows.
•
The equipment cannot be left running, with a load on the
hook, or with the jib deployed, or in wind conditions in
excess of allowed values.
•
The boom should be retracted as far as is practical, the
equipment configured in as stable a configuration as
possible (boom angle, superstructure orientation, jib
angle, etc.)
•
In high winds the boom and jib should be lowered, or
secured. Changing weather conditions including, but not
limited to, wind, ice accumulation, precipitation, flooding,
lightning, etc., should be considered when determining
the location and configuration of the equipment when it
is to be left unattended.
SHUT-DOWN
Use the following steps when shutting down the equipment:
•
Engage the parking brake.
•
Fully retract and lower the boom.
•
Engage the swing lock pin or 360 degree swing lock.
•
Place controls in neutral position.
•
Shut down the engine and remove the ignition key.
•
Chock the wheels, if not on outriggers.
•
Lock the operator’s cab (if applicable) and install vandal
guards, if used.
COLD WEATHER OPERATION
Cold weather operation requires additional caution on the
part of the operator.
Check operating procedures in this manual for cold weather
starting.
Don’t touch metal surfaces that could freeze you to them.
Clean the equipment of all ice and snow.
Allow ample time for hydraulic oil to warm up.
In freezing weather, park the equipment in an area where it
cannot become frozen to the ground. The drive line can be
damaged when attempting to free frozen equipment.
If applicable to your equipment, frequently check all air tanks
for water in freezing weather.
Never store flammable materials on the equipment.
National Crane recommends use of cold weather starting
aids that are provided on your equipment. The use of aerosol
spray or other types of starting fluids is prohibited.
TEMPERATURE EFFECTS ON HOOK
BLOCKS
Hook Block Working Load Limit (WLL) is valid between 60°C
(140°F) and the low temperature limit given on the hook
block identification plate with normal lifting precautions.
L i ft i n g a b o v e 7 5 % o f t h e Wo r k i n g L o a d L i m i t , a t
temperatures between the service temperature given on the
identification plate and -40°C (-40°F), must be done at a slow
and steady rate to avoid stress spikes.
75% of the Working Load Limit must not be exceeded when
lifting in temperatures below -40°C (-40°F).
TEMPERATURE EFFECTS ON HYDRAULIC
CYLINDERS
Hydraulic oil expands when heated and contracts when
cooled. This is a natural phenomena that happens to all
liquids. The coefficient of expansion for API Group 1
hydraulic oil is approximately 0.00077 cm³ per cm³ of volume
for 1°C of temperature change (0.00043 in³ per in³ of volume
for 1°F of temperature change).
Thermal contraction will
allow a cylinder to retract as the hydraulic fluid which is
trapped in the cylinder cools.
The change in the length of a cylinder is proportional to the
extended length of the cylinder and to the change in
temperature of the oil in the cylinder. For example, a cylinder
extended 7.6 m (25 ft) in which the oil cools 15.5°C (60°F)
WARNING
Tipping Hazard!
When parking the equipment and leaving it unattended
follow the instructions for the Controls and Operating
Procedures of this manual.
Failure to comply with these instructions may cause death
or serious injury
!
Fo
r
Reference
Only
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