OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Lower Wiper (option)
C-50 C-50
9803/9880-3
Lower Wiper (option)
Operation
C027310GB-2
Fig 51.
The lower wiper is a customer selected option and is fitted
to the lower glass panel at the front of the operator's cab.
The wiper has three modes of operation intermittent,
continuous and off. Timing for the intermittent function is
performed by ECU1. The same timer as utilised for the
standard wiper is used to synchronise both wipers
together.
When the lower wiper button is operated the ECU1 output
number o/p 11 (C-15) is energised to start the wiper stroke.
A hold on contact within the motor assembly retains power
for the return stroke of the blade. A time delay equal to
that set for the main wiper is activated before the output is
energised again, giving intermittent operation.
A second press of the switch enables the wiper to operate
continuously and the output is permanently energised.
A third press of the switch disables wiper operation.
Note: If the upper (main) wiper is energised then the lower
wiper output is energised at the same time, synchronising
both wipers.