SET-UP OPERATOR MANUAL 500E2
4-2 Published 07-26-2019 Control # 111-06
If the operator cannot see the load handling device
approaching the boom nose, he shall have an assistant
(signal person) watch the load handling device. The operator
shall be prepared to stop the machine immediately should
the anti-two-block system not function properly as indicated
by lighting the red warning light, sounding the audible alarm
(jib-equipped cranes) and locking the crane movements,
hoist up, telescope out and boom down.
Check the anti-two-block alarm light and the audible alarm
(jib-equipped cranes) by performing one of the following
tests:
• By manually lifting the weight attached to the anti-two-
block switches. When the weight is lifted, the audible
alarm (jib-equipped cranes) should sound, the anti-two-
block alarm light should light.
• Slowly raise the main boom load handling device to
create a potential two-block condition. When the load
handling device lifts the weight, the audible alarm (jib-
equipped cranes) should sound, the anti-two-block
alarm light should light and the motion of the load
handling device should be stopped. Lower the load
handling device slightly to eliminate this condition.
• Slowly extend (telescope) the boom to create a potential
two-block condition. When the load handling device lifts
the weight, the audible alarm (jib-equipped cranes)
should sound, the anti-two-block alarm light should light
and the boom telescope out function should be stopped.
Lower the load handling device slightly to eliminate this
condition.
• If the crane is equipped with a boom extension (jib) that
is deployed and rigged for work, repeat the test
procedure for the boom extension (jib) anti-two-block
switch.
Work Site Selection
Always seek the best possible work site when parking the
crane. An ideal parking location at a job site is firm, level, dry
ground or pavement located in close proximity to the work
station. Avoid uneven, rocky or muddy terrain, steep grades
or locations with unnecessary overhead obstructions.
Location should be selected such that outriggers can be fully
extended and leg comes down on firm level surface.
Particular care must be taken when in the vicinity of
overhead power lines so that proper clearance conditions
can be maintained. Do not select a location at which the
boom could not come within minimum recommended
distance of the power lines at full extension.
Its best to select a location on the site such that most of the
lifting can be done over the outrigger support or rear of the
truck.
Before Leaving the Cab
1. Position the truck so that the outriggers can be extended
without encountering obstructions. Set the truck park
brake securely and turn front wheels into the curb.
Wheel chocks may be required under certain conditions.
2. With the gear shift in neutral, depress clutch (if equipped
with a manual transmission), and engage the power
takeoff by pulling out the shifting knob.
3. Bring the hydraulic system up to operating temperature
(oil reservoir warm to the touch) by allowing the system
to operate by actuating the outrigger retract switch with
all outriggers fully retracted.
If operating on sloping ground provide blocks. When lifting is
to be done on soft terrain or hot asphalt, support the
outrigger and stabilizer pads with bearing pads. Some
concrete and asphalt surfaces are relatively thin and cannot
support outrigger or stabilizer loading. Concrete can break
through and cause instability.
Variation in chassis, outrigger, and mounting configurations
will cause outrigger foot loading to differ on each crane,
however, outrigger foot loads can be as high as 40,000 lbs
(18,145 kg) when outriggers are at full span (131 psi
(0.9 MPa) on standard outrigger pads). Support surface
bearing capacities vary by a large amount from 833 psi
(5.7 MPa) on bed rock down to 14 psi (0.1 MPa) on soft clay.
Loose sand or soft asphalt will support even less load. It is
imperative that the operator take proper precautions to
insure the outrigger foot has adequate cribbing for existing
soil conditions.
If specific outrigger foot loading is required for an individual
crane, contact National Crane with actual chassis weights
and crane details.
Lifting Over the Rear
Before conducting any boom operations, extend both
outriggers until the chassis weights removed from the
wheels. Level the crane from side-to-side. A level indicator is
provided at either control station. Then extend and lower the
stabilizers to level the crane front-to-back. Again refer to the
CAUTION
If the light and audible alarm (jib-equipped cranes) do not
function as described and the crane movements are not
stopped, the system is not working properly. The
malfunction shall be corrected before operating the crane.
DANGER
To prevent the crane from tipping over.
• Make sure crane is level.
• Do not operate the boom until all outriggers are
extended and set providing firm support.
• Make sure the tires are clear of ground.
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