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6.
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).
7.
Loosen and remove the four motor mounting screws.
8.
Pull the motor out of the pump housing.
If the motor will not dislodge from the pump
i
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.
9.
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.
10.
Remove and inspect the 2nd stage gear for damage or excessive
wear. Replace if necessary.
11.
Remove and inspect the gear and crank assembly for damage or
excessive wear. Replace if necessary.
12.
Reassemble the pump by reversing the above steps. During
reassembly, make sure the thrust washer is in place.
Refill the gear box in the pump housing with five
i
ounces of Lubriplate (P/N 314-171).
Motor cover
Control panel
mounting screw
Control panel
Front cover
Front cover screw
2.4
REPLACING THE TRANSDUCER
1.
Loosen and remove the four front cover screws. Remove the
front cover.
2.
Stop the sprayer at the bottom of its stroke so that the piston is
in its lowest position.
3.
Perform the Pressure Relief Procedure and unplug the sprayer.
8
Motor
mounting
screw
Motor
2nd stage
gear
Gear and
crankshaft
Thrust
washer
Motor
cover
screw
Belly pan
Belly pan
screw
Before proceeding, follow the Pressure Relief
Procedure outlined previously in this manual.
Additionally, follow all other warnings to reduce
the risk of an injection injury, injury from moving
parts or electric shock. Always unplug the sprayer
before servicing!
4.
Tilt the pump back for easy access to the fluid section.
5.
Using a 3/8" hex wrench, loosen and remove the two pump block
mounting screws.
6.
Pull the pump block down approximately 1/2" from the pump
housing to clear the transducer.
7.
Slide the pump block and piston rod forward until the piston rod
is out of the T-slot on the slider assembly.
8.
Carefully pull the transducer wire out of the pump housing until
the connection to the transducer jumper is exposed. Unplug the
wire from the transducer jumper (refer to the electrical schematic
in the Parts List section of this manual).
9.
Using a wrench, remove the transducer assembly from the pump
block.
10.
Thread the new transducer assembly into the pump block.
Tighten securely with a wrench.
11.
Plug the new transducer wire into the transducer jumper (refer to
the electrical schematic in the Parts List section of this manual).
12.
Reassemble the pump by reversing steps 1–7.
Transducer
jumper
Front
cover
Front
cover
screw
Transducer
assembly
IMPACT 640
Pump
housing
T-slot
Pump
block
Pump
block
mounting
screw
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