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Unit Functions
BR/BD 75/140 R, BR/BD 90/140 R
New Unit Information 03.2004
Metering valve (Y2)
The metering valve is located at the rear beneath
the dirty water tank.
The servo motor (5) only opens the metering valve
if the following conditions are fulfilled:
– Water pump is switched on (instrument panel
button)
– Brush head is lowered (instrument panel but-
ton)
– Driving operation forwards or reverse (instru-
ment panel button)
– Drive unit pedal pressed
The two microswitches (6) switch off the servo
motor (5) in the end positions. They are not ad-
justable. The buttons on the instrument panel can
be used to adjust the metering valve in 10 steps
with the servo motor.
Metering valve (ORIGINAL)
5
6
7
Air bleeder valve (only BR-head)
If the water pump is switched off and the meter-
ing valve is closed the air bleeder valve (3) opens
and allows the water in the hose between the
metering valve and the T-junction to drain. This
reduces dribbling at the brush head to a mini-
mum.
The air bleeder valve (3) is located on top of the
brush head.
Air bleeder valve BR head
1
Hose from the water pump
2
T-junction
3
Air bleeder valve
4
Hose to the brush head
5
Servo motor
6
Microswitch (2x)
7
Metering valve housing
8
Potentiometer
Water system
2
3
Metering valve (REVISED)
5
Metering valve (Y2)
This metering valve does not have microswit-
ches (6), instead the position is recorded via a
potentiometer (8).
7
1
8
ORIGINAL
ORIGINAL
REVISED
REVISED
