Manitowoc National Crane NBT60L User Manual

NBT60L OPERATOR MANUAL CONTROLS AND OPERATING PROCEDURES
3
NATIONAL CRANE Published 09-06-2019 Control # 691-01 3-25
RCL Check
Perform the following checks to verify proper RCL operation.
• Check that the display of the main boom length agrees
with the actual boom length.
• Check that the display of the main boom angle agrees
with the actual boom angles.
• Check that the display of the operating radius of the
crane agrees with the actual radius.
Check the load display by lifting a load of known weight. The
accuracy of the load indication shall be within the tolerance
of SAE J159.
HOIST SYSTEM OPERATION
The Hoist may have lifting capabilities greater than that of the
crane limits. Therefore, care must be taken to ensure that the
load lifted is within the crane rating. General rules for hoist
operation are:
• Unwind the hoist when extending the boom.
• Use the anti-two-block system only as an aid.
• Make sure the rope is not twisted or kinked and that it is
properly seated in the hoist and in sheaves.
• Always have at least three full wraps of wire rope and
eight full wraps of synthetic rope on the hoist.
• Check the hoist brake when approaching the load limit of
the hoist. Raise the load a few inches and return the
control to neutral to check the brake.
• Do not drag the load with the hoist.
• Do not try to lift loads that are not free such as, frozen
down material or poles.
• Keep tension on the rope to prevent it from becoming
twisted, kinked, or improperly seated on the hoist.
Work Site Location
• Select a location that is firm, level, and dry.
• Avoid uneven, rocky or muddy terrain, steep grade or
locations with overhead obstructions.
• The outrigger jacks must be supported on a firm level
surface at the fully retracted, mid-span, three-quarter
(NTC models only), or fully extended positions.
• Avoid overhead power lines.
Before Leaving the Truck Cab
• Position the truck so that the outriggers can be extended
with no obstructions.
• Position the truck transmission to one of the following:
- Park if available (common on automatic
transmissions). Otherwise,
- Neutral (common for manual and automated
manual transmissions).
• Set the truck park brake. Wheel chocks may also be
required.
• Engage the power takeoff.
• Turn the truck cab ignition switch to OFF.
Stowing and Parking
When parking the crane, it should be placed in the smallest,
most stable operational configuration that the job site
practically allows by doing the following steps:
1. Remove the load from the hook.
2. Stow the jib, if erected.
3. Fully retract the boom and position it in the normal travel
position, then perform the following and proceed to
Step 6:
a. Engage the swing brake and/or swing lock.
b. Retract all jack cylinders and outrigger beams.
DANGER
A deviation between displayed and actual values
indicates a malfunction and a RCL service representative
shall be called for repair and/or recalibration of RCL
system.
!
DANGER
Truck must be in neutral with the park brake set before
starting engine from crane cab to avoid sudden potential
movement of truck.
WARNING
Tipping Hazard!
Never park the crane near holes, or on rocky or extremely
soft surfaces. This may cause the crane to overturn.
Failure to comply with these instructions may cause death
or serious injury.
!

Manitowoc National Crane NBT60L Specifications

General

Brand	Manitowoc
Model	National Crane NBT60L
Category	Construction Equipment
Language	English