National Crane 3-29-2018 Control # 610-00 3-7
NBT40-1 SERIES OPERATOR MANUAL SAFETY INFORMATION
The aerial lift can tip over or fail structurally if:
• The load and equipment’s configuration is not within the
capacity as shown on the applicable Reach Diagram
and notes.
• The ground is soft and/or the surface conditions are
poor.
• Outriggers are not fully extended and set.
• Cribbing under the outrigger pads is inadequate.
• The aerial lift is improperly operated.
If you should encounter a tipping condition, immediately
retract or elevate the boom to decrease the work platform
reach. Never lower or extend the boom; this will aggravate
the condition.
Check clearances above, on sides, and below work platform
when raising, lowering, swinging and telescoping the aerial
lift boom.
Do not strike any obstruction with the boom. If the boom
should accidentally contact an object, stop immediately.
Inspect the boom. Remove the aerial lift from service if the
boom is damaged.
Never push or pull with the aerial lift boom.
Avoid sudden starts and stops when moving the work
platform. The inertia and an increased load radius could tip
the aerial lift over or cause it to fail structurally.
Do not carry material or equipment on the work platform
railing unless approved by Manitowoc Crane Care.
Never use the aerial lift for any purpose other than
positioning personnel, their tools and equipment. Use of the
aerial lift as a crane is prohibited. See “Safety Precautions -
Crane” 2-1.
Boom Extension
To avoid death or serious injury, follow the procedures in this
manual during erection, stowage, and use of the boom
extension.
Install and secure all pins properly.
Control movement of boom extension at all times.
Do not remove right side boom nose pins unless boom
extension is properly pinned and secured on front and rear
stowage brackets.
Do not remove all the pins from both front and rear stowage
brackets unless the boom extension is pinned to the right
side of the boom nose.
Properly inspect, maintain, and adjust boom extension and
mounting.
When assembling and disassembling boom extension
sections, use blocking to adequately support each section
and to provide proper alignment.
Stay outside of boom extension sections and lattice work.
Watch for falling or flying pins when they are being removed.
Counterweight
On aerial lift equipment with removable counterweights,
ensure the appropriate counterweight sections are properly
installed before performing operation.
Do not add material to the counterweight to increase
capacity. United States Federal law prohibits modification or
additions which affect the capacity or safe operation of the
equipment without the manufacturer’s written approval.
Outrigger Lift Off
The occurrence of an outrigger lifting from the ground is often
attributed to the natural flex in the aerial lift’s frame. This may
happen in certain configurations within the capacity limits of
the aerial lift Reach Diagram and is not necessarily an
indication of an unstable condition.
Provided the aerial lift is properly set up, the aerial lift is in
good working condition, that all operator aids are properly
programmed, that the qualified aerial lift operator adheres to
the instructions found in the applicable Operator Manual and
decals on the aerial lift, the aerial lift should not be unstable.
Aerial Lift Inspection
• In addition to the aerial lift's frequent and periodic
inspections, dated daily records shall be maintained
showing inspections were performed on the aerial lift. All
RCL systems shall be inspected daily and verified to be
functional. Refer to “Inspection And Maintenance” 9-1
for additional inspection information.
DANGER
Boom Extension Hazard!
To avoid death or serious injury, follow procedures in Load
Chart, safety, and operation manuals during erection,
stowage and use of boom extension. Install and secure all
pins properly and control boom extension movement at all
times.
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