Pump Service (Model 226040) - Graco G Series Instructions-Parts List Manual

BEFORE YOU START
1. Have all the necessary repair parts on hand.
Recommended spare parts are marked with an
asterisk (for example, 113*). Tool 233582, mentioned
in this procedure, is located on the accessories page
of this manual.
2. Repair Kit 224005 is available. For the best results,
use all the new parts in the kit. Parts in the kit are
marked with two asterisks (for example, 107**).
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 (120) 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 valve housing (117) from the
pump frame (119). Disassemble the intake valve.
3. Push down on the upper connecting rod (120) until
the fluid piston assembly is clear of the displacement
pump frame (119). Pull the piston assembly and
connecting rod out of the frame. Remove the bearing
(118) and seal (134**) from the frame.
NOTE: Scoring or irregular surfaces on the connecting
rods (120, 115) or polished inner wall of the pump frame
(119) 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 (109) from the
lower connecting rod (115). Unscrew the piston body
(113) from the piston valve housing (109).
5. Unscrew the lower connecting rod (115) from the
upper connecting rod (120). Remove the cup
packings (107), bearing (108) and backup washer
(114).
6. Lubricate the packings (107**) and bearing (108**)
with no. 2 lithium-based grease. Install the backup
washer (114) on the lower connecting rod (115),
making certain that the grooves face up.
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Pump Service (Model 226040)

7. On the upper connecting rod (120), install one cup
packing (107**) with the lips facing up, the bearing
(108**), and the second packing (107**) 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 (111**) and bearing (112**)
with no. 2 lithium-based grease. On the piston (113),
install one cup packing (111**) with the lips facing
down, the bearing (112**), and the second packing
(111**) with lips facing up. Install the backup washer
(110), with the grooves facing down.
9. Place the ball (104**) atop the piston body (113), then
screw the piston body and piston housing (109)
together. Torque to 30-35 ft-lb (41-48 N.m). Screw
the piston valve housing onto the lower connecting
rod (115). Install the seal (134**), with the lips facing
down, in the displacement pump frame (119), then
install the bearing (118**). The seal (134**) should be
installed from the bottom of the frame using tool
233582. See fig. 5. Use a turning motion to work the
connecting rod and piston back into the pump frame
(119).
Fig. 5
10. Reinstall the ball (105**) and ball stop pin (116) in the
intake valve housing (117), and screw the housing
into the displacement pump frame (119).
11. Lay the pump on its side and reconnect the upper
connecting rod (120) with the air motor piston rod.
Tighten the air motor connecting ring (AA).
12. Reinstall the pump on its mounting. If the grounding
wire was disconnected during service, reconnect it
before operating the pump.
TI0894