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REPAIR KIT INSTRUCTIONS
Roseville, MN
Ph: 1-800-444-2373
Fax: 651-645-7390
www.fastestinc.com
WP161, Rev A 4/2/2019
INLET PORT
CAP
PISTON
BODY
RING GROOVE
IN BODY
RET RING
Dis-Assembly:
1.Dis-connect termination Inlet and outlet fittings.
2.Remove Booster from mount setup.
3.Using an arbor press, place Booster in a vertical position with “Inlet” port facing up.
4.Lower arbor press down against the face of the inlet port. Lock arbor in place.
5.Using a sharp pick or small flat screwdriver remove
spiral retaining ring. Discard ring.
6.Using caution because the inlet cap is spring loaded, unlock arbor press and slowly raise the
arbor up. Inlet cap and piston will come out of the body.
7.Remove and discard o-ring from cap and piston.
8.Remove and discard die spring.
9.Remove and discard (2) o-rings from down
inside the body.
10.Clean cap, piston and body.
Re-Assembly:
1.Lube all new o-rings with petroleum jelly.
2.Install new o-rings in body grooves first.
3.Install piston and cap o-rings.
4.With body in a vertical position, place new spring into center of body.
5.Place piston down onto spring.
6.Place cap on piston, make sure markings on cap are facing out!!!
7.Place new spiral retaining ring onto cap.
8.Stand this assembly up on arbor press, lower press down onto cap.
9.Lower cap and piston until retaining ring groove in body is exposed enough to install new
retaining ring.
10.Using small flat screwdriver Install retaining ring.
11. Section view showing
groove and cap compressed
far enough to install ret ring.
12.Re-connect fittings into the inlet and outlet ports on booster.
13.Re-fill as required with petroleum based hydraulic oil.
14.Mount booster back into setup. See FasTest operating instruction WP016 for reference.