Manitowoc National Crane NBT40-1 Series User Manual

4-16 3-29-2018 Control # 610-00
OPERATING CONTROLS - CRANE NBT40-1 SERIES OPERATOR MANUAL
Warm-up Procedures:
1. Without operating hoist function, warm hydraulic oil (see
Hydraulic Oil System, page 4-16).
2. Once hydraulic system is warm, operate unloaded hoist,
in both directions, at low speeds several times to prime
all hydraulic lines with warm hydraulic oil and to circulate
gear lubricant through the planetary gear sets.
Swing Drive and Turntable Bearing
Warm-up Procedures for Temperatures Above -7°C
(20°F):
1. Setup crane on fully extended outriggers, with boom
fully retracted and near maximum lift angle with no load
applied.
2. Rotate superstructure at a speed of less than one RPM
for at least one complete revolution in one direction, then
rotate superstructure at a speed of less than one RPM
for at least one complete revolution in opposite direction.
Warm-up Procedures for Temperatures Below -7°C
(20°F):
1. Ensure boom is fully retracted and near maximum lift
angle with no load applied.
2. Rotate superstructure at a speed of less than one-half
RPM for at least two complete revolutions in one
direction, then rotate superstructure at a speed of less
than one-half RPM for at least two complete revolutions
in opposite direction.
Axles
NOTE: For National Crane axle warm-up procedures, refer
to chassis manufacturer’s manual.
Hydraulic Oil System
Operating Limits and Warm-up Procedures:
• From 4°C to -10°C (40°F to 15°F): Crane operation
without
a load is allowed with medium engine RPM and
medium function speed (joystick position) until fluid
reaches at least 10°C (50°F). It is then recommended
that all crane functions be cycled to remove cold fluid
from all components and cylinders of hydraulic system.
If there is any unusual sound coming from crane’s
hydraulic pumps or motors, stop operation and engine
immediately and contact a Manitowoc distributor.
• From 10°C to 4°C (50°F to 40°F): Crane operation with
a load is allowed with medium engine RPM and medium
function speed (joystick position) until the fluid reaches
at least 10°C (50°F).
• From 95°C to 10°C (200°F to 50°F): Crane operation
with a load is allowed with no restrictions.
• Above 95°C (200°F): No crane operation is allowed. Let
crane’s hydraulic oil cool by running engine at idle with
no functions actuated.
Anti-two-block (A2B) Check
Check anti-two-block (A2B) alarm light and audible alarm by
lifting (A2B) weight until switch is activated. To check anti-
two-block switch:
• manually lift weight.
• slowly raise hoist rope.
• slowly extend (telescope) boom.
If crane is equipped with a jib that is deployed and rigged for
work, repeat test procedure for jib anti-two-block switch.
RCL Check
Perform following checks to verify proper RCL operation.
• Check that display of main boom length agrees with the
actual boom length.
• Check that display of main boom angle agrees with
actual boom angles.
• Check that display of operating radius of crane agrees
with actual radius.
Check load display by lifting a load of known weight.
Accuracy of the load indication shall be within tolerance of
SAE J159.
DANGER
The following tests must be performed with caution to
prevent damage to machine or injury to personnel.
DANGER
If light and audible alarm do not function and hoist does
not stop, system is not working properly and must be
corrected before operating crane.
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.
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Manitowoc National Crane NBT40-1 Series Specifications

General

Brand	Manitowoc
Model	National Crane NBT40-1 Series
Category	Construction Equipment
Language	English