VAF instruments OILCON MARK 6M - 15.10 WINDOW WASH PUMP PROBLEMS

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15.10 WINDOW WASH PUMP PROBLEMS
For disassembly and re-assembly procedures of the window wash pump consult section 8.2.4.
15.10.1 Pump does not work
Probable causes Action
1
Air supply failure

Check the air supply to solenoid V12 in the EPU,
minimum 5.0 bar (0.5 MPa).
 Check the air supply to the regulator/lubricator,
minimum 5.0 bar (0.5 MPa).
 Check the functioning of solenoid V12 in the EPU.
2
Air cycle valve failure

Check the sleeve and cycling spool (under the cap of
the muffler) for contamination.
Replace if necessary.
3
Electric circuit failure

Check the power supply in the EPU.
 Check the connection to solenoid V12 in the EPU.
 Check the operation of solenoid V12.
Replace if necessary.
 Check the connection between the MCU and the EPU.
15.10.2 Pump cycles without pumping or does not stall
Probable causes Action
1
No water supply.

Check the water supply to the pump.
2
Check valves not seating or
leaking in the system.

Inspect the inlet check valve.
 Inspect the outlet check valve.
15.10.3 False cycle
Probable causes Action
1
Leakage from the pilot exhaust
(top centre of the cap).

Check the air section seal.
Replace if necessary.
15.10.4 Fluid appears at muffler
Probable causes Action
1
High pressure seal leakage.

Check the high pressure seal.
Replace if necessary.