- Scribe mark on housings for reassembly. Remove front housing seal and piston rod. Attach assembly to suitable holding fixture (J-22805). Align tool so that check valve in front housing is not damaged. Loosen lock nut and remove push rod clevis and locknut (if equipped). Remove dust boot retainer, dust boot and silencer from diaphragm plate extension.
- Partially straighten four deepest tabs on rear housing. Place suitable wrench (J-9504) over studs on rear housing and attach with nuts and washers. Press down on wrench and rotate rear housing clockwise to separate. Remove wrench.
CAUTION:
Housings are under spring pressure.
- Remove air filter from diaphragm plate extension. Remove diaphragm from groove in diaphragm plate. Handle diaphragm carefully. Hold diaphragm plate so that push rod is in horizontal position. Depress rod slightly and rotate piston until air valve lock falls from diaphragm plate hub. Remove reaction disc from diaphragm plate bore (use push rod, or suitable tool), to push disc from seat.
CAUTION:
Do not chip diaphragm plate.
- Remove rear shell bearing seal with punch or screwdriver. Remove vacuum check valve and grommet.
CAUTION:
Remove rear seal only if a new one is available. Do not reuse old seal.