I need info to help diagnose a Watson Chalin pusher axle with auto raise in reverse. I have tried through KW and parts contacted PACCAR for help. Wanted to replace valves but received incorrect ones. Pulled 3 valves off under body cleaned checked for numbers, None on the valves at all! I have replaced the in cab pressure control and the on/off flipper valve. The system deploys but leaks air from valves in cab and under body severely. System will not retract/lift when requested unless air is completely depleted from air tanks. If air tanks are near empty, less than about 20 psi axle then recharged with air the axle will raise. I want/need a parts list schematics of air lines and electric auto lift in reverse and/or someone knowledgeable of these axles. I appreciate you have taken time to read this far! Thank you.

Bob Oetzel
Owner/Technician
Auto & Truck of Williamsburg
Williamsburg, Ohio, USA