National Crane Published 10-30-2014 Control # 040-09 7-31
1400H OPERATOR AND SERVICE MANUAL INSTALLATION
to lift loads around the front of the truck unless the unit is
equipped with a front stabilizer.
Note: This does not apply to cranes equipped with a
Rear Mount configuration.
Note: Weights of accessories installed on the boom
or loadline (including downhaul weight) must be
deducted from the calculated load when checking
stability.
4. If slight tipping occurs, but load can be kept from coming
in contact with ground by hoisting the load up, unit is
stable. If not, counterweighting will have to be added to
get unit in a stable condition or decal must be added to
define areas of full stability and areas of reduced
capacity because of stability. If the unit is equipped with
a jib, the stability test should be repeated. Use the fully
extended jib capacity multiplied times 1.176 at the
lowest angle that the jib is rated fully extended.
5. When adding counterweight to the vehicle, it is usually
most effective when added as close to the crane as
possible. After adding counterweight, the above
procedure must be repeated to insure the added
counterweight is adequate.
6. If unit is not stable 360° around the truck, a decal must
be added showing the working area according to
stability.
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