Reassembly - Graco DM-22 Manual

Repair

Reassembly

NOTE: Lubricate all packings and o-rings with a com-
patible grease before reassembling.
1. Install one u-cup packing (215) in the throat of the
fluid housing (203), with the lips facing down. Apply
thread lubricant and install the piston rod housing
(232) with the rod guide (231) into the fluid housing
(203). Torque to 298-314 in-lb (35–37 N•m).
2. Install the second u-cup packing (215) in the throat
of the piston seal retainer (202) with lips facing the
threads. Place the washer (216) over the seal.
Apply thread lubricant and install the seal retainer
(202) onto the fluid housing (203). Torque to
298-314 in-lb (35–37 N•m).
3. Screw the priming piston rod (204) into the fluid pis-
ton (201) until the holes align. Install the pin (210) in
the holes. Carefully slide the assembled piston and
rod down through the wet-cup and fluid housing.
4. Place the intake valve (207) onto the seat of the
intake valve housing (205) with the snap-ring facing
up. Insert the valve stop (206) into the intake valve
housing. Be sure the valve stop (206) seats on the
lip of the intake housing. Lubricate the o-ring (214).
Bend it into a kidney shape, then carefully push it
into the inner groove of the intake valve housing
(205), to avoid damaging it.
5. Apply thread lubricant to the lower threads of the
fluid housing (203). Bring the fluid housing and
intake valve housing (205) together. Make sure the
priming piston rod (204) passes straight through the
valve stop (206) and intake valve (207) already
installed in the housing (205). Screw together the
fluid housing (203) and the fluid intake housing
(205), then torque to 298-314 in-lb (35–37 N•m).
6. Apply lubricant to the threads of the screw (213).
Hold the fluid piston (201) steady by inserting a
small screwdriver or punch into the 4mm diameter
hole (BA). Install the priming piston (208) onto the
end of the priming piston rod (204), using the screw
(213) and lockwasher (211). Torque to 14-20 in-lb
(1.7–2.3 N•m).
7. Apply lubricant to the top threads of the fluid hous-
ing (203). Screw the cylinder coupling (223) onto the
fluid housing, and torque to 298-314 in-lb (35–37
N•m).
20
8. Thread the fluid piston (201) into the shaft of the air
motor (418) until the holes line up. Use the screw
(213) to turn the fluid piston, if necessary. Once the
holes in the air motor shaft and fluid piston are
aligned, insert the pin (212).
9. Lower the pump through the mounting bracket. Ori-
ent it in the correct direction and secure to the
bracket using the three screws and washers.
Torque the screws to 17-33 in-lb (2–4 N•m). Rein-
stall the fluid outlet fitting.
10. Reinstall the wiper plate assembly on the fluid
intake housing (205). Secure with the two wiper
plate cap screws (302). Reconnect all hoses and
return the pump to service.
3A7931B