2-13
OPERATING THE CRANE
The following procedure is recommended for placing the crane in operation:
1. Perform daily inspection and test. (See Page 3-4)
2. Switch park brake to "on."
3. Place transmission shift lever in neutral.
4. Start engine and allow a warming period.
5. While warming the engine set up the Rated Capacity Limiter configuration.
6. Set all outriggers fully down on firm, level surface. Use timber or steel plate cribbing
under outrigger shoes as needed on soft ground. Outriggers should remain set
during all crane operations except for pick and carry.
7. You may use the throttle control switch to set the engine speed to 1200 or 1800 rpm
when the park brake is on and transmission is in neutral. Return to idle by releasing
the park brake momentarily.
8. Meter the controls when beginning or terminating movement to prevent sudden
starting or stopping, imposing undue shock loads on the equipment, especially
when handling heavy loads. The control should be slightly actuated to begin
movement and then slowly increased to desired operating speed. The results
obtained from metering the control lever can also be achieved by coordinating the
foot throttle control.
RATED CAPACITY LIMITER (RCL)
A rated capacity limiter is installed on the crane to assist the operator in estimating loads
and measuring load radii. Please read the RCL Operation Manual for complete
instructions on operation of the system. Following are some additional operating tips.
Always be aware that the RCL can stop boom movement at capacity load conditions
and in two-blocking conditions. Use good judgment in controlling the speed of boom
movements to prevent shock loads and swinging loads.
If the RCL system stops the crane movement there are various remedies that may be
used to restart operation. If the hook is two-blocked, it should be lowered using the
hoist control, if safe. The boom raise and telescope retract may also be used if this is
safer.
If the load is the maximum for the loadline or attachment, the load should be set down in
a safe place using the hoist lower control and the load, the parts of line or the
attachment changed. Telescope retract may also be used, if safe. DO NOT USE THE
BOOM RAISE OR LOWER CONTROL as these may increase the overload.
If the load is at the maximum allowable load radius, the boom can be raised or retracted
to a safe radius or the load may be lowered to a safe place using the hoist
control. If the boom extension is at its angle limit, the boom must be raised or the load
lowered to the ground with the hoist control.
If the boom is fully lowered until it stops, (about 0°) the RCL will show an overload
condition because the boom lift pressure sensors cannot read a useful pressure in this
condition. To remedy this, raise the boom slightly. On the other hand, if the boom is
fully raised, (about 70°) the RCL may show an overload condition because the pressure
in the boom lift cylinders is sensed to be an overload. To correct this condition, the
CANCEL button on the RCL control can be pushed and held and the boom lowered just
slightly. Then check for other conditions before lowering further.
Courtesy of Crane.Market
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