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Pump Service (Model 223954)
BEFORE YOU START
1. Have all the necessary repair parts on hand.
Recommended spare parts are marked with an
asterisk (for example, 313*). Tool 233583, men-
tioned in this procedure, is located on the accesso-
ries page of this manual.
2. Repair Kit 224005 is available. For the best re-
sults, use all the new parts in the kit. Parts in the
kit are marked with two asterisks (for example,
307**).
3. Use a compatible solvent to clean parts. Inspect
parts for wear or damage and replace as needed.
4. Flush the pump if possible. Stop the pump at the
bottom of its stroke. Follow the Pressure Relief
Procedure Warning on page 7.
5. Disconnect the air and fluid hoses. Remove the
pump from its mounting. Clamp the pump in a
vise.
SERVICING THE DISPLACEMENT PUMP
1. Unscrew the air motor connecting ring (AA). Lay
the pump on its side and rotate the displacement
pump until the ball on the upper connecting rod
(320) comes free of the socket in the motor piston
rod. Separate the motor from the displacement
pump.
NOTE: To service the air motor, refer to separate
manual 307851, supplied.
2. Unscrew the intake adapter (321) from the intake
valve housing (317). Remove the o-ring (322).
Unscrew the intake valve housing (317) from the
pump frame (319). Disassemble the intake valve.
3. Push down on the upper connecting rod (320) until
the fluid piston assembly is clear of the displace-
ment pump frame (319). Pull the piston assembly
and connecting rod out of the frame. Remove the
bearing (318) and seal (334**) from the frame.
NOTE: Scoring or irregular surfaces on the connecting
rods (320, 315) or polished inner wall of the pump
frame (319) can cause premature packing wear and
leaking. To check these parts, rub a finger over the
surface or hold the part up to the light at an angle.
4. Unscrew the piston valve housing (309) from the
lower connecting rod (315). Unscrew the piston
body (313) from the piston valve housing (309).
5. Unscrew the lower connecting rod (315) from the
upper connecting rod (320). Remove the cup
packings (307), bearing (308) and backup washer
(314).
6. Lubricate the packings (307**) and bearing (308**)
with no. 2 lithium-based grease. Install the backup
washer (314) on the lower connecting rod (315),
making certain that the grooves face up.
7. On the upper connecting rod (320), install one cup
packing (307**) with the lips facing up, the bearing
(308**), and the second packing (307**) with the
lips facing down. Reconnect the upper and lower
connecting rods. Torque to 20-25 ft-lb (27-34 N.m).
8. Lubricate the packings (311**) and bearing (312**)
with no. 2 lithium-based grease. On the piston
(313), install one cup packing (311**) with the lips
facing down, the bearing (312**), and the second
packing (311**) with the lips facing up. Install the
backup washer (310) with the grooves facing
down.
9. Place the ball (304**) atop the piston body (313),
then screw the piston body and piston housing
(309) together. Torque to 30-35 ft-lb (41-48 N.m).
Screw the piston valve housing onto the lower
connecting rod (315). Install the seal (334**), with
the lips facing down, in the pump frame (319), then
install the bearing (318**). The seal (334**) should
be installed from the bottom of the frame using tool
233583. See fig. 5. Use a turning motion to work
the connecting rod and piston into the frame (319).
10. Reinstall the ball (305**) and stop pin (316) in the
intake valve housing (317). Screw the housing into
the pump frame (319). Place the o-ring (322**) into
the inner groove of the intake adapter (321). Screw
the adapter onto the intake valve housing (317).
11. Lay the pump on its side and reconnect the upper
connecting rod (320) with the air motor piston rod.
Tighten the air motor connecting ring (AA).
12. Reinstall the pump on its mounting. If the ground-
ing wire was disconnected during service, recon-
nect it before operating the pump.
307026
11
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