Kesla XS 190, Operation & Maintenance Manual

Page: 42 / 83

Kesla
®
XS
190
SELF PROPELLED TELESCOPIC PLATFORM
41
USING THE EMERGENCY LOWERING SYSTEM
DESIGN OF THE EMERGENCY LOWERING SYSTEM
The emergency lowering system comprises an emergency lowering pump, the push-
buttons for using the emergency lowering pump in the platform and at the ground control
station, a platform control valve, a lower control valve, and the emergency lowering system
instruction decals in the platform and at the turntable.
1.
The electric emergency lowering pump is parallel with the main hydraulic pump, and
always ready to supply oil into the system should the main hydraulic pump not work, or if,
for some reason, the boom valve cannot be operated from the platform.
2.
The emergency lowering pump supplies oil either to the platform control valve or to
the ground station control valve.
USING THE EMERGENCY LOWERING SYSTEM
Using the system from the platform:
1.
Press the emergency lowering button and keep it pressed during the whole lowering
operation. Press the boom pedal switch and, at the same time, use the platform control
valve.
2.
Always retract the boom completely before beginning to lower it.
Using the emergency control system from the turntable:
1. Press the emergency lowering button and keep it pressed during the whole lowering
operation. Lower the platform using the control valve.
2.
Always retract the boom completely before beginning to lower it.
THE EMERGENCY LOWERING SYSTEM SHOULD NOT BE USED TO
MOVE THE BOOM IN NORMAL WORK.
The pump motor must not be used continuously longer than approx. 3 minutes. The
battery is also drained very fast (after which the engine will not start).
The emergency lowering pump motor has a thermal protection switch. When the thermal
protection switch is activated due to high temperature, the motor stops. Wait for 3 to 5
minutes to let the motor cool down. The thermal protection switch will reset automatically.
WARNING ! !