Replacing The Piston And Spring - WAGNER W 140 P Training Manual

Replacing the piston and spring

The average life of a piston and spring will vary depending on the types of material
being sprayed. Replace the piston if the sprayer takes longer than 2 minutes to prime
when well lubricated, or if there is an excess amount of material leaking and you have
tried all of the troubleshooting suggestions listed in this manual. Replace the spring if
you notice that it is broken when you clean the sprayer.
To replace the piston:
1. Make certain the sprayer
is unplugged.
2. Turn the spray tip
counterclockwise until it is
removed. Be careful not to
lose the swirl valve.
3. Pull out the swirl valve.
4. Turn the locking nut
counterclockwise until it is removed.
5. Slide the pump housing assembly off of the sprayer.
6. Pull the piston and spring off of the pump housing.
7. Pull the spring off of the piston and throw away the old piston.
35
Maintenance – cont.
Swirl Valve