32
MOTOR REPLACEMENT
Before doing this procedure, follow the
Pressure
Relief Procedure Warning
on page 22 to reduce
the risk of a fluid injection injury , splashing in the
eyes or in the skin, injury from moving parts or elec-
tric shock.
Unplug the sprayer!
WARNING
Refer to Fig 33–1 unless otherwise instructed.
1. Remove the motor shield (23).
2. Remove the pressure control cover (17). Disconnect
the four motor leads.
3. Loosen the conduit connector nut (345) at the pres-
sure control (18).
4. Swing the conduit (13f) away from the pressure con-
trol elbow (13a).
5. Remove the conduit seal (21) from around the conduit
elbow coming into the control box. Pull the motor
leads through the elbow, one at a time.
CAUTION
Always pull the motor leads one at a time to avoid
loosening the terminals, which could result in a bad
connection and poor sprayer performance.
6. Loosen the connector nut (13a) at the motor and pull
the conduit (13f) away from the motor. Pull the leads
through the conduit, one at a time.
7. Unscrew the connector elbow from the motor.
8. Pull the wires through the elbow, one at a time.
9. Remove the front cover (2).
10. Remove the two screws (49) and washers (9) from
the recess of the drive housing (8).
11. Remove the two screws (58) and washers (9) from
the lower rear of the motor front end bell (A).
12. Remove the two screws (10) and washers (9) from
the upper rear of the motor front end bell (A).
13. Use a plastic mallet to gently tap the displacement
pump (29) from the rear to loosen the drive housing
(8) from the front end bell (A). Pull the drive housing
away from the end bell.
CAUTION
DO NOT allow the gear cluster (51) to fall when re-
moving the drive housing (8). It is easily damaged
if dropped. The cluster may stay engaged in either
the front end bell or the drive housing.
DO NOT lose the thrust balls (8a, 13h) located at
each end of the gear cluster (51) or allow them to fall
between gears. The ball, which is heavily covered
with grease, usually stays in the gear recesses, but
could be dislodged. If caught between gears and
not removed, the balls will seriously damage the
drive housing. If the balls are not in place, the bear-
ings will wear prematurely.
14. While supporting the motor to keep the sprayer from
tipping, remove the four screws (38), washers (59),
lockwashers (39) and nuts (40) holding the motor to
the frame. Lift off the motor.
15. Place the new motor on the frame and align the frame
mounting holes. Install the screws (38), washers (59),
lockwashers (39) and nuts (40) tightly.
16. Liberally grease the gear cluster (51) and pinion gear
(B) and pack all bearings in the motor front end bell.
Check to be sure the thrust balls (8a,13h) are in place.
NOTE:
The gears and bearings between the drive hous-
ing and the motor front end bell should contain a
total of 6 oz. of grease.
17. Place the bronze–colored washer (8b) and THEN the
silver–colored washer (8c) on the shaft protruding
from the big gear in the drive housing (8).
18. Align the gears and push the drive housing (8) straight
onto the front end bell (A) and locating pins.
19. Starting at Step 12 and working backwards, continue
to reassemble the sprayer.
NOTE:
Use a turning motion on the conduit (13f) when
feeding wires through it.
20. Install the conduit seal (21) around the wires in the
conduit elbow (345) at the pressure control to keep
contaminants from entering the motor conduit. See
the Detail in Fig 33–1.
21. Install the motor shield and pressure control cover.
