Replacing the Motor
1. Perform the Pressure Relief Procedure and unplug the
sprayer.
2. Loosen and remove the four motor cover screws.
Remove the motor cover.
3. At the electronic pressure control (EPC) on the back off
the motor, disconnect the wire coming from the
potentiometer and the wire coming from the transducer.
Also, disconnect the two wires coming from the control
panel board (refer to the electrical schematic in the Parts
List section of this manual).
4. Remove the four control panel mounting screws. Pull
back the control panel for access to the control panel
board.
5. At the the control panel board, disconnect the two wires
coming from the motor (refer to the electrical schematic in
the Parts List section of this manual).
6. Loosen and remove the four motor mounting screws.
7. Pull the motor out of the pump housing.
8. With the motor removed, inspect the gears in the pump
housing for damage or excessive wear. Replace the
gears, if necessary.
9. Install the new motor into the pump housing.
10. Secure the motor with the four motor mounting screws.
11. Reconnect the wires (refer to the electrical schematic in
the Parts List section of this manual).
12. Position the control panel on the pump housing and
secure in position using the four control panel mounting
screws.
13. Slide the motor cover over the motor. Secure the motor
cover with the four motor cover screws.
Motor
Motor Mounting
Screw
Pump Housing
Front Cover
Front Cover Screw
Control
Panel
Control
Panel
Mounting
Screw
Motor Cover Screw
Motor Cover
Electronic
Pressure
Control
(EPC)
NOTE: If the motor will not dislodge from the pump
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.
10
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Replacing the Gears
1. Perform the Pressure Relief Procedure and unplug the
sprayer.
2. Loosen and remove the four motor cover screws.
Remove the motor cover.
3. At the electronic pressure control (EPC) on the back off
the motor, disconnect the wire coming from the
potentiometer and the wire coming from the transducer.
Also, disconnect the two wires coming from the control
panel board (refer to the electrical schematic in the Parts
List section of this manual).
4. Remove the four control panel mounting screws. Pull
back the control panel for access to the control panel
board.
5. At the the control panel board, disconnect the two wires
coming from the motor (refer to the electrical schematic in
the Parts List section of this manual).
6. Loosen and remove the four motor mounting screws.
7. Pull the motor out of the pump housing.
8. Inspect the armature gear on the end of the motor for
damage or excessive wear. If this gear is completely
worn out, replace the entire motor.
9. Remove and inspect the 2nd stage gear for damage or
excessive wear. Replace if necessary.
10. Remove and inspect the gear and crank assembly for
damage or excessive wear. Replace if necessary.
11. Reassemble the pump by reversing the above steps.
During reassembly, make sure the thrust washer is in
place.
2nd Stage Gear
Thrust Washer
Gear and Crank
Assembly
Armature Gear
Motor
Electronic
Pressure
Control
(EPC)
Motor
Mounting
Screw
Pump Housing
Front Cover
Front Cover Screw
Control
Panel
Control
Panel
Mounting
Screw
NOTE: Refill the gear box in the pump housing with
five ounces of Lubriplate (P/N 314-171).
NOTE: If the motor will not dislodge from the pump
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.
