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The directional control switches are marked LOWER BOOM, ROTATION, and UPPER BOOM. These switches control
movement of the booms and rotation system. The LOWER BOOM switch controls up and down movement of the lower boom.
Since the UniLift Model 542 KB is an articulated lift, its important to understand that in certain instances, raising the lower boom
will actually bring the bucket down. The UPPER BOOM switch controls up and down movement of the upper boom. The
ROTATION switch controls clockwise and counter-clockwise rotation of the booms.
The rotation system is equipped with two limit switches that prevent more then 350Eof rotation. When the boom is rotated, and
a limit switch is reached, rotation will stop. Simply reverse the control and rotate in the opposite direction to reposition the
bucket.
Both upper and lower booms have interlocks that limit travel. When a stop is reached, release the control switch to prevent
overheating of the hydraulic oil and damage to the pump. Actuation of a control switch automatically starts the DC motor so the
motor runs only when required, conserving battery life.
Generally, only one function should be operated at a time. Rotation (which is a DC motor function) may be operated in
conjunction with a boom function.
To operate the machine from the Lower Control Station:
!
Hold the UPPER CONTROL-LOWER CONTROL switch in the "LOWER CONTROL" position.
!
Activate a control switch in the direction of an arrow to move the bucket/boom in the corresponding direction.
!
When the control switch is released, it springs back to the neutral position, and movement stops.
!
Movement will also stop when the UPPER CONTROL-LOWER CONTROL switch is released.
4520362-1/0302
Figure 1-5
Lower Control Station
Operation - Page 1 - 5
Courtesy of Crane.Market
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