Service; Disassembly; Reassembly - Graco A Series Instructions - Parts Manual

Service

Disassembly

NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in F
the parts drawings. Refer to those for service.
NOTE: Repair Kit 223894 is available to repair 235871,
and Repair Kit 25C844 is available to repair 25D097.
Parts included in these kits are marked with a
in the parts list on page 23 and page 25. For the best
results, use all the new parts in the kit.
1. Follow the Pressure Relief Procedure on page
10.
2. Disconnect all hoses. Remove the wiper plate.
Remove the fluid outlet elbow (28), noting its posi-
tion relative to the air inlet. Remove only the three
screws (38) and lock washers (41) holding the pump
to the mounting bracket (33).
3. Rotate the pump so the bleeder valve (25) is aligned
with the slot in the mounting bracket (33), and lift the
pump straight up through the bracket.
4. Remove the pin (144) from the fluid piston (106).
Unscrew the air motor shaft from the fluid piston by
turning the screw (145).
5. Unscrew the adapter (214) from the cylinder cou-
pling (196). Pull the air motor coupling straight up
until it clears the fluid piston (106).
6. Hold the fluid piston (106) steady by inserting a
small screwdriver or punch into the 4 mm diameter
hole (A). Remove the screw (145) and lock washer
(135) holding the priming piston (115) to the priming
piston rod (110).
7. Pull the priming piston rod (110) and fluid piston
(106) straight up out of the fluid housing (109).
Remove the pin (123), and unscrew the priming pis-
ton rod from the fluid piston.
308302U
. 8 on page 17 and
IG
symbol
†
8. Unscrew the intake valve housing (111) from the
fluid housing (109). Remove the o-ring (161) from
the intake valve housing.
9. Remove the intake valve (114) and valve stop (112)
from the intake valve housing (111).
10. Unscrew the wet-cup/packing nut (107). Remove
the u-cup packing (163) from the throat. Remove
the o-ring (162) from the wet-cup/packing nut.
11. 13. Clean all parts with a solvent compatible with
the fluid you are pumping, and inspect for wear or
damage. Reassemble as explained on this page.

Reassembly

NOTE: Lubricate all packings and o-rings with a com-
patible grease before reassembling.
1. Install the u-cup packing (163) in the throat of the
fluid housing (109), with the lips facing down. install
the o-ring (162) into the groove above the bearing of
the wet-cup/packing nut (107). Apply thread lubri-
cant and install the wet-cup/packing nut in the fluid
housing (109). Torque to 298-314 in-lb (35–37
N•m).
2. Screw the priming piston rod (110) into the fluid pis-
ton (106) until the holes align. Install the pin (123) in
the holes. Carefully slide the assembled piston and
rod down through the wet-cup and fluid housing.
3. Place the intake valve (114) onto the seat of the
intake valve housing (111). Insert the valve stop
(112) into the intake valve housing, with the flat side
facing up. Be sure the valve stop (112) seats on the
lip of the intake housing. Lubricate the o-ring (161).
Bend it into a kidney shape, then carefully push it
into the inner groove of the intake valve housing
(111), to avoid damaging it.
4. Apply thread lubricant to the lower threads of the
fluid housing (109). Bring the fluid housing and
intake valve housing (111) together, making sure
the priming piston rod (110) passes straight through
the valve stop (112) and intake valve (114) installed
in the housing (111) onto the fluid housing (109),
then torque to 298-314 in-lb (35–37 N•m).
Service
15