020203.06
13
Electro-Hydraulic Pumps
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3
2
4
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3
2
4
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1
3
2
4
2
3
5
Filling and bleeding
Hydraulic steering system, cylinder and EHP with a reversible motor (EHPA R2, EHPB R2, EHPC R2)
Temporarily remove the connections between the automatic stee-
ring gear or the selector switch and the EHP motor.
Connect the orange wire from the relay via a switch to the positive
terminal of the battery.
Remove the filler neck of the pump housing.
Place a funnel in the appropriate opening and fill the EHP tank with
hydraulic oil.
Details concerning the oil specifications are found in the ‘Technical
Specifications’.
While filling, make sure that the tank contains a sufficient oil volume;
if the pump sucks in air, the system must be ventilated once more.
In order to prevent the oil from absorbing air, fill the tank slowly and
carefully.
Open the air bleed valve A. Move the piston rod until the piston
touches the end cover A. Then switch on the EHP motor by acti-
vating the switch. As soon as the oil emerging from the breather
nipple A is air-free, the EHP motor may be turned off again.
Close the breather nipple A and turn on the EHP motor once
more. Fill up the buffer tank while the piston, through the EHP, is
moved toward the end cover B.
Now connect the white wire from the electromotor via a switch
to the positive terminal of the battery.
Open the breather nipple B.
Activate the EHP motor by pressing the appropriate switch. As
soon as the oil emerging from the breather nipple B is air-free,
the EHP motor may be switched off again and the breather nip-
ple B may be closed.
Fill the buffer tank up to the specified level.
Disconnect the temporary connections from the battery to the
relay and reconnect the terminals of the automatic steering con-
trol or the selection switch to the relay of the EHP motor. Check
whether the piston rod moves in the right direction. If the piston
rod does not move in the right direction reverse the connections
of the orange and white wires.
ENGLISH
1 Red (+)
2 Brown (-)
3 Orange
4 White
