Replacing the Motor Assembly
Electrostatic discharge (ESD) potential could cause
damage to electronic control. Use SprayTECH ESD wrist
strap P/N 0507958 or equivalent when working on
electronic control with electronic cover removed.
1. Perform the Pressure Relief Procedure and unplug the
sprayer.
2. Remove the four motor cover screws. Remove the motor
cover.
3. Slide the electronic cover off of the electronic control
assembly on the motor.
4. Remove the four heat sink assembly screws. Pull back
the heat sink assembly to access and disconnect the two
wires coming from the motor.
5. At the electronic control assembly, disconnect the wire
coming from the potentiometer and the wire coming from
the transducer.
6. Loosen and remove the four motor mounting screws.
7. Pull the motor out of the gear box housing.
8. With the motor removed, inspect the gears in the gear box
housing for damage or excessive wear. Replace the
gears, if necessary.
9. Install the new motor into the gear box housing.
10. Secure the motor with the four motor mounting screws.
11. Reconnect the wires to the electronic control assembly
(refer to the electrical schematic in the Parts List section
of this manual).
12. Connect one of the motor wires to the power cord and the
other to the ON/OFF switch.
13. Position the electronic cover over the electronic control
assembly.
14. Position the heat sink assembly on the gear box housing
and secure in position with the four heat sink assembly
mounting screws
15. Slide the motor cover over the motor. Secure the motor
cover with the four motor cover screws.
Motor
Cover
Screw
Motor
Mounting
Screw
Electronic
Cover
Heat Sink
Assembly Screw
Heat Sink
Assembly
Motor
Gear Box
Housing
Front Cover
Front Cover Screw
Motor Cover
NOTE: If the motor will not dislodge from the gear
box housing:
• Remove the front cover plate.
• Using a rubber mallet, carefully tap on the
front of the motor crankshaft that extends
through the slider assembly.
WARNING
Replacing the Gears
Electrostatic discharge (ESD) potential could cause
damage to electronic control. Use SprayTECH ESD wrist
strap P/N 0507958 or equivalent when working on
electronic control with electronic cover removed.
1. Perform the Pressure Relief Procedure and unplug the
sprayer.
2. Remove the four motor cover screws. Remove the motor
cover.
3. Slide the electronic cover off of the electronic control
assembly on the motor.
4. Remove the four heat sink assembly mounting screws.
Pull back the heat sink assembly to access and
disconnect the two wires coming from the motor.
5. At the electronic control assembly, disconnect the wire
coming from the potentiometer and the wire coming from
the transducer.
6. Loosen and remove the four motor mounting screws.
7. Pull the motor out of the gear box housing.
8. Inspect the rotor gear on the end of the motor for damage
or excessive wear. If this gear is completely worn out,
replace the motor.
9. Remove and inspect the 2nd stage gear assembly for
damage or excessive wear. Replace, if necessary.
10. Remove and inspect the crankshaft/gear assembly for
damage or excessive wear. If damaged or worn, replace
the crankshaft/gear assembly.
11. Reassemble the pump by reversing the above steps.
During reassembly, make sure the thrust washers is in
place.
Front Cover
Gear Box Housing
Front Cover Screw
2nd Stage Gear
Thrust Washer
Motor
Crankshaft/Gear
Assembly
Rotor Gear
Motor Mounting Screw
Motor Cover
Motor Cover Screw
NOTE: Refill the gear box with five ounces of
Lubriplate (P/N 9870307).
NOTE: If the motor will not dislodge from the gear
box housing:
• Remove the front cover plate.
• Using a rubber mallet, carefully tap on the
front of the motor crankshaft that extends
through the slider assembly.
WARNING
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