Removal and Replacement of the Wheel Control Valve Assembly

If there is a continual trickle of flushing water into the pan, when the safety control valve (11 or VE11) is worn, the solution is replacement of the complete unit.

Undo nut (12 or VE12). The spigot of 12 or VE12 will remain in the pump body. If you wish to replace this - as new wheel control valves are supplied with 12 or VE12 - then you need to use key H to remove it. 

Remove the control valve (11 or VE11) from the back pipe (9 or 4M or VE9) by holding the back pipe in a soft jawed vice, simultaneously holding the control valve body with a screwdriver and undoing nut (10 or VE10) with spanner D. 

ASSEMBLE IN REVERSE ORDER 

NOTE: Apply semi-hardening jointing compound to the threads on the nut (10 or VE!)).