Motor Replacement - Graco A Series Instructions-Parts List Manual

MOTOR REPLACEMENT
(Refer to Fig 26)
1. Remove the motor~shield (141 and screws (64).
2. Disconnect the .pump outlet hose (47) from the
displacement pump outlet nipple
(46).
3. Remove the screws (151 and pressure control cover
(36) and disconnect the four motor leads. See
Fig
19, page 25.
4. Use an adjustable wrench to loosen the conduit
connector nut (54b) at the pressure control
assembly
(431.
5. Swing the conduit
(22)
away from the conduit
elbow (54b).
6. Remove the.conduit seal (5) from around the wires
in the pressure control. Pull the motor leads
through the elbow, one
a t
e 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.
7. Loosen the nut of the connector
( 5 4 a l
at the motor
and pull the conduit (22) awayfrom the motor, then
pull the leads through the conduit, one at a time.
8. Unscrew the connector elbow from the motor.
9. Pull the wires through the elbow, one at a time.
10. Remove the front cover and screws (31,321.
11. Use a 114'' hex key wrench to remove the three
screws (30) and washers
( 6 3 1
from the recess of the
drive housing, and the two screws (21
I
and washers
(63) from the top rear of the motor front end bell
(El.
12. Use a plastic mallet to gently tap the displacement
from the front end bell. Then pull the drive housing
pump
(391
from the rear to loosen the drive housing
away from the end bell.
1
DO NOT allow the gear cluster (91 to fall when
CAUTION
damaged if dropped. The cluster may stay engag-
removing the drive housing (181. It is easi&
ed in either the front end bell or the drive housing.
end of the gear cluster (91 or allow them to fall
DO NOT lose the thrust balls (10) located at each
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
bearings will wear prematurely.
13. While supporting the motor to keep the sprayer
from tipping, remove the nuts (40), lockwashen
(411 and capscrews (37) holding the motor mount-
ing plate (72) to the frame. Lift the motor assembly
off the frame.
14. Remove the mounting plate (721, four screws
( 7 9 )
and lockwashers
( 6 3 1
from the old motor, and in-
stall them on the new motor.
CAUTION
Be sure to install the correct length ,of screw.
Longer screws will damage the motor.
15. Place the new motor assembly on the frame and
align with the frame mounting holes. Install the
screws (73). lockwashers (41) and nuts
(401
tightly.
16. Liberally grease the gear cluster (91 and pinion gear
(0) and pack all bearings in the motor front end
bell. Check to be sure the thrust bells (101 are
in
place.
17. Be sure the bronze-colored washer (27d is in place
on the crankshaft
(27).
18. Align the gears and push the drive housing (18)
straight onto the front end bell and locating pins.
19. Starting et Step 11 and working backwards, con-
tinue to reassemble the sprayer.
.
,
NOTE: Use a turning motion on the conduit when
feeding wires through it.
20. Reinstall the conduit seal (5-not shown1 around the
wires in the conduit elbow (54%) a t the pressure
control to keep contaminants from entering the
pressure control.
21. Reinstall the motor cover and pressure control
cover.