REPAIR/REBUILD INSTRUCTIONS
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www.fastestinc.com
Roseville, MN
Toll Free at 1-800-444-2373
Fax 651-645-7390
WP143 Rev B 6/25/2021
REASSEMBLE:
Note: Use all new seals, springs, snap rings etc… that are provided. Lightly lubricate seals
with petroleum jelly.
1. Place new o-rings into body and onto piston.
2. PAY CLOSE ATTENTION TO WASHER AND VALVE SPRING PLATE INSTALLATION
INTO PISTON. INNER CHAMFER SIDE OF WASHER GOES INTO PISTON FIRST. LUBE
AND PLACE O-RINGS OVER AND INSIDE THE VALVE SPRING PLATE.
3. Place collets around body, use new collet o-ring to hold collets in place.
4. Note: Threaded collets must be placed in order around body, according to spiral timing
groove on outside of collet segments.
5. Open collets far enough to place new inner piston spring down inside body, then press
piston down inside collets. Might help to stand up vertically on work surface.
6. With piston down inside collets, hold collets closed with free hand.
BODY
PISTON
COLLETS OPEN
COLLETS OPEN
& RECEIVING
PISTON
COLLETS IN
CLOSED POSITION
COLLET
GROOVE
WASHER
CHAMFER SIDE
PISTON SPRING
