unseating the rope wedge in the winch drum, which could result in the uncontrolled
fall of the hook block and load. Use of more parts of line than required for the lift
increases likelihood of rope damage.
4.
Raise the boom to the required angle, consulting the boom angle indicator which
indicates boom angle relative to upper structure.
The boom elevation is controlled by foot pedals or hand lever. To RAISE the boom,
slowly depress the LEFT boom control foot pedal forward or pull the joystick lever
back. To LOWER the boom, slowly depress the LEFT boom control foot pedal
backward or push the joystick lever forward. Improved control is obtained by
operating the engine at low speed while “metering” the controls. Always operate and
release the controls slowly to minimize dynamic effects of the load. During a lift where
precise control of the load is required, do not attempt to use more than one function at
a time.
Always consider possible obstructions when varying boom height or length; not
only those to the front of the cab at the time of the adjustment, but those which
may be encountered during swings.
Play the swing through, considering all obstacles, prior to using swing function.
Never hold the controls in an “activated” position once the hoist/lower cylinder or
extend/retract cylinders have reached the limits of their travel. This can cause
overheating of the hydraulic oil if it is run over relief for prolonged periods.
5. Swing the boom over the load.
Upper structure swing is controlled by the swing lever. To swing the upper structure to
the RIGHT, PUSH the lever forward. To swing LEFT, PULL the lever backwards. Swing
speed increases as the lever is moved further side to side on LH joystick. Swing speed
also varies with the engine speed.
Before attempting to swing the upper structure, make sure the swing brake is not set
and the swing lock is not engaged. Be certain that no obstructions will block the swing.
Stopping the swing too abruptly will cause the load to oscillate and impose side
loads on the boom. Because side loading can damage boom, ALWAYS START
AND STOP SWINGS GRADUALLY.
When ready, try for a smooth, controlled, safe swing. The swing should be SLOW.
Start the swing SLOWLY and allow the load to build up only enough momentum to
carry it through to the point where it is to be lowered.
Begin slowing the swing in advance of the point where the load is to be lowered. Slow
the swing GRADUALLY, so that it appears to “coast” to a stop over the desired spot.
GRADUALLY slow the swing by use of the swing lever. First, move the lever to the
neutral position and then VERY SLOWLY into the opposite swing direction position as
required to slow the swing.
T300-1_T500-1_T780
Operating Instructions
190 P/N 12261-683
REVISED: January 2015
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