10
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IMPORTANT: Do not allow solvent to drain into the motor
enclosure of the pump.
12. Wipe out excess moisture from cavity and apply a film of
piston lube or light grease to the inside of the cavity.
13. Replace the seal in the bushing:
Bushing
Seal
assembly
a. Place bushing in vise (do not
over clamp - may egg-shape
the hole)
b. Using a small flat blade
screwdriver, carefully pry the
seal from the bushing.
c. Using a brush and solvent,
clean and inspect the bushing.
d. Measure the bushing. If the
bushing inner diameter at
either end is more than 0.441 inches, then the bushing
should be replaced. A new bushing will prolong seal life.
e. Placing the new seal flat on a stable
surface, snap the bushing over the
seal.
14. Fill the bushing cavity with light
grease and temporarily slide the piston
through to force out any excess. Wipe
off grease from tip of piston and
remove.
15. Slide the bushing into the bushing/seal
cavity in the housing up to the start of the threads.
16. Engage the threads while rotating the bushing/seal assembly.
17. Screw the assembly in until the hex bottoms against the spot
face in the housing (35-45 in-lbs).
18. Placing the yoke/piston assembly in a vise, remove and
replace the old piston with the new piston in the seal/piston
kit (torque the socket head screw to 60-70 in-lbs).
NOTE: If the yoke is worn excessively, it should be replaced
at this time along with the driver bushing and
driver screw. If the yoke slot measures greater than
.510 inches wide, then the yoke, shoulder bolt and
eccentric bushing should be replaced as a set.
19. Slide the new piston and yoke assembly into the bushing/seal
assembly oriented as shown.
20. Align the yoke slot with the eccentric threaded hole.
21. Thread the shoulder screw and bushing into the eccentric
while jamming the yoke again with the wrench. Torque
shoulder screw to 50-60 in-lbs.
22. Replace the heel cover and screws - Torque screws to 6-8 in-
lbs.
Replacing the Pressure Setting Valve
1. Perform CLEANUP procedure.
2. Adjust pressure to PRIME position.
3. Remove material hose.
4. Remove pump from turbine, ensuring power is removed.
5. Tip pump on its side to drain excess solvent. The unit should
be tipped on the side that contains the fittings for the siphon/
return tubes.
Set screw
6. Remove pressure adjustment knob
set screw using a 1/8 allen wrench.
Remove the knob.
7. Remove diaphragm locking nut using
an adjustable wrench.
8. Remove stem from locking nut, taking
care not to lose the compression spring.
9. Remove the diaphragm assembly from the pump housing.
10. Carefully pry the worn seat from the pump housing.
11. Clean the seat bore in the pump housing.
12. Apply a thin film of adhesive into the seat recess.
13. Press new seat into seat bore and wipe away excess adhesive.
14. Assemble diaphragm assembly into the pump, taking care to
ensure the edge of the diaphragm disk are pushed past the
threads and within the thread relief.
Pressure
knob
Locking
nut
Stem
Spring
Diaphragm
assembly
Seat
15. Apply a generous coat of grease the stem threads
16. Assemble spring, stem and locking nut.
17. Torque locking nut to 100-120 in-lbs
18. Rotate stem counter-clockwise until it is backed out as far as
possible. This is the PRIME position.
PRESSURE
PRIME
1
2
3
4
5
6
6:00
19. Without turning the stem,
assemble the pressure adjustment
knob and lock down so the PRIME
notation is oriented as shown.
20. Apply Loctite 243 to the threads
of the set screw. Tighten the set
screw on the pressure adjustment
knob. Torque to 6-8 in-lbs.
