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Repair
NOTE: There are no user-serviceable parts in the
motor. Contact your Graco representative for
assistance.
Prepare Equipment for Service
1. Stop the pump at the bottom of its stroke.
2. Shut off and lock out the electrical disconnect (A).
3. Follow the Pressure Relief Procedure, page 11.
4. Follow the Flushing Procedure, page 12.
5. Disconnect the hoses from the lower and plug the
ends to prevent fluid contamination.
Disconnect the Pump Lower
1. Disconnect the lower from the motor. Use a repair
manual that corresponds with your model. Find
your specific lower model in the Pump Matrix on
page 17.
2. Remove the 2-piece coupler shield (10) by inserting
a screwdriver straight into the slot, and using it as a
lever to release the tab. Repeat for all tabs. Do not
use the screwdriver to pry the shields apart
3A7828B
10
F
. 9 Coupler shield assembly
IG
3. Loosen the coupling nut (9) and remove the collars
(8). Remove the coupling nut (9) from the piston
rod. Unscrew the locknuts (6) from the tie rods (4).
Separate the lower (5) from the tie rods (4).
Reconnect the Lower and Motor
1. If the coupling adapter (7) and tie rods (4) have not
been disassembled from the motor (3), skip to Step
2.
If the coupling adapter (7) and tie rods (4) have been
disassembled from the motor (3), follow these steps:
a. Screw the tie rods (4) into the motor (3) and
torque to 50-60 ft-lb (68-81 N•m).
b. Apply red thread locker to the coupling adapter
(7).
c. Screw the coupling adapter (7) into the motor
shaft and torque to 90–100 ft-lb (122–135
N•m).
d. Continue to step 2.
2. Assemble the coupling nut (9) over the piston rod.
3. Orient the lower (5) to the motor (3). Position the
lower on the tie rods (4).
Repair
15
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