Mercedes-Benz 603 Service Manual page 320

2-pin connector on swrtchover valve (Y30)
l-pin connector on pressure switch (S66) . . . . . .
Engine overload protection switch (S66) . . . . . . .
Special tools
Commercial tester
Digital multimeter
Valve tester
Optionally O-6 bar pressure gauge
Optionally nozzle tester EFEP 60l-i
09 10111-2502
detach and briefly energize with voltage. The
switchover valve must audibly actuate; replace if
necessary.
detach and test for continuity with ohmmeter.
The pressure switch (S66) is open in the off
position.
remove.
Connect pressure switch to cable of nozzle
tester KDJE-P 400.
Connect ohmmeter to pin of pressure switch
and to housing. Build up pressure of
0.15 bar at nozzle tester; the pressure switch
must not have any continuity. Replace pressure
switch if necessary.
e.g.Sun, DMM 5
e.g. Bosch, KDJE-P 400
(Bosch Order Designation)
e.g. Bosch No. 1687 231 000
e.g.Bosch No. 0684 200 700
EXIT
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