9-38 Published 08/16/19 Control # 112-05
CRANE INSTALLATION 500E2 SERVICE MANUAL
The stability test load will be 1.18 times the load chosen from
the load rating area of the capacity chart.
Example for 571E2
• Boom Length: 71' (21.64 m)
• Loaded Radius: 60' (18.29 m)
• Load Rating: 2200 lb (998 kg)
• Stability Test Load: 1.18 x 2200 lb (998 kg) = 2596 lb
(1178 kg) (Includes weights of slings and downhaul
blocks.)
Be sure the stability test weight is accurate. A 1% increase in
stability test weight will mean up to a 10% increase in
counterweight. Extend the boom to the maximum boom
length and hoist the stability load off the ground. Slowly
boom the load down so the load will swing out, until the
loaded radius is reached. As the boom is lowered keep
hoisting the load up to keep it about 6 inches off the ground.
NOTE: Do not exceed loaded radius.
Slowly rotate the boom throughout the work area. As the
boom is rotated, the boom will have to be raised and/or
lowered to maintain the loaded radius because of subbase
flexure.
On units not equipped with single front outriggers, tipping
from stabilizer support to front wheel support will occur as the
load or boom is swung around the front. Do not attempt to lift
rated loads around the front of the truck unless the unit is
equipped with a SFO.
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 1.18 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.
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