2-16
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The Hydraulic Capacity Alert (HCAS) is available in
two configurations: a Single (Boom only) or Dual (HCAJ)
(Boom and Jib) The HCAS and HCAJ systems work
identically to monitor boom capacity conditions. The
HCAJ system has the added ability to monitor Jib op-
erations (when the Jib is deployed)
The HCAS System is “non-selectable”. The system
is permanently set to the monitor the Boom (without Jib
deployed)
In the HCAJ System the Crane Operator can select
either “BOOM” or “JIB” on a two position switch on the
Operators Console. The Boom and Jib CANNOT be
monitored at the same time, the system will only moni-
tor one system at a time.
The Hydraulic Capacity Alert System is a hydrauli-
cally operated, maximum capacity sensing device that
will stop all of the normal crane functions that cause
overload when maximum capacity is exceeded. In the
event that an over capacity condition occurs, the Hy-
draulic Capacity Alert System is actuated by sensing
excessive pressure in the lift cylinder which causes the
2+ !
boom down, extend out and winch up functions to be-
come inoperative. These are the functions that increase
the over capacity condition. This system allows for con-
tinued operation of the winch down, boom up and boom
retract functions, the functions that normally allow the
operator to bring the load to a shorter operating radius
or set the load down in order to eliminate an over ca-
pacity condition. Once the excessive cylinder pressure
has been reduced by bringing the load to a shorter ra-
dius or setting the load down, normal operation can be
resumed.
When the Dual Hydraulic Capacity Alert Selector
Switch is set to “Jib”, the HCAJ is actuated when the
Boom Angle is reduced to below 75° and will prevent
increasing the sensed over capacity condition. Normal
operation will be restored when the Boom angle is in-
creased to 75°.
The Hydraulic Capacity Alert System has an over-
ride switch or button located on the operator’s console
that momentarily overrides the hydraulic capacity alert
and anti-two-block systems and restores power to crane
functions. Two indicator lights located near the override
switch alert the operator of function power loss and dis-
criminate between the hydraulic capacity alert and the
anti-two-block systems as the cause of power loss. If
crane is equipped with optional audible alert, an audible
alarm will sound in an overload condition. $'
$&#%$$'3$$#7
%$45<%%$8
The Hydraulic Capacity Alert System provides a load
range gauge at each operator station. This gauge has
three colors on the dial face: (1) Green – OK; (2) Yellow
– Caution; and (3) Red – Overload. The gauge is
plumbed directly to the lift cylinder and the indicator po-
sition can be used as an aid in determining the load
condition of the crane. The lift control lever must be
moved from boom up position to the neutral position to
get the most accurate reading when using load range
gauge.
$'$&%'4$&(58
HYDRAULIC CAPACITY ALERT
ANTI–TWO–BLOCK
OVERRIDE
HOLDING THIS OVERRIDE TO
INCREASE LOADING OR TWO BLOCK
THE CRANE WILL RESULT IN
+x
TO CORRECT THE CONDITION CAUSING
THE CRANE SHUTDOWN REFER
TO OWNERS MANUAL
876452
"
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Reference Only
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