INSTALLATION 1400H OPERATOR AND SERVICE MANUAL
7-24 Published 10-30-2014 Control # 040-09
COUNTERWEIGHTING
1. Refer to “Truck Requirements” pages in this section. The
amount of counterweight and its location is dependent
upon the weight of the truck and all permanently
attached equipment. Permanently attached equipment
which can be considered as counterweight includes
reinforcing, PTO's and pumps, tool boxes, auxiliary
hoists, etc. The torsion resisting subbase is considered
part of this crane and not part of the counterweight.
Additional counterweight is usually added to the
underside of the bed and/or to the torsion resisting
subbase. On some trucks, a heavy front bumper may
also be required for stability. This crane is stable to 85%
tipping factor at full outrigger span.
2. The 85% tipping factor as outlined in OSHA and ANSI
specifications means that when lifting the full capacity
loads most likely to cause the truck (with outriggers and
stabilizer set) to overturn, the unit is at 85% of tipping
over. Increasing this full capacity load by 117.6%
(overloading) will cause the unit to tip over. These loads
are not shaded on the load rating chart.
3. This crane is stable to a variable stability factor with the
outriggers set at mid-span. This factor is based on an
International Standards Organization (ISO) formula
which uses an 80% stability factor and also factors in
dynamic loads due to boom weight. If the crane is stable
to the 85% stability factor as outlined in #2, it will meet
the mid-span stability factors as outlined in the ISO
reduced span formula.
4. In order to determine the amount of counterweight
required, it is necessary to add up the weight that each
permanently attached piece of equipment will place on
the front and rear axles of the truck along with the initial
truck chassis weight and then compare the total front
and rear axle weights with the weights listed on the
“Truck Requirements” pages to determine the amount
and location of counterweight required.
COUNTERWEIGHTING METHODS FOR STABILITY AROUND THE REAR 180°
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