Graco ULTRA 500 Instructions-Parts List Manual page 30

1. Remove the motor shield (14) and screws (64).
2. Disconnect the pump outlet hose (47) from the
displacement pump outlet nipple
(461.
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
( 5 4 b I
at the pressure control
assembly
(43).
5.
Swing the conduit (22) away from the conduit
elbow
( 5 4 b I .
6. Remove the conduit seal (51 from mound the wires
in the pressure control. Pull the motor leads
through the elbow, one et a time.
CAUTION
Alwaw pull the motor leads one at a time to avoid
loosening the terminals which could result in e bad
connection and poor sprayer performance.
A
7. Loosen the nut of the connector
( 5 4 a I
at the motor
and pull the conduit
( 2 2 1
away from the motor, then
puli 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 e t a time.
10. Remove the front cover and screw8 (31,321.
11. Use a 114" hex key wrench to remove the three
screws
(301
end washers (63) from the recess of the
drive housing, and the two screws (21
I
and washers
(631
from the top rear of the motor front end bell
(El.
12. Use e
plastic mallet to gently tap the displacement
pump
1391
from the.reer to loosen the drive housing
from the front end bell. Then pull the drive housing
away from the end bell.
CAUTION
DO
NOT
allow the gear cluster (91 to fall when
removing the drive housing
(181. It is eesih
damaged if dropped. The cluster may stay engag-
ed in either the front end bell or the drive housing.
DO
NOT
lose the thrust balls
(10)
located a t each
end of the gear cluster (91 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
bearings will weer prematurely.
13.
While supporting the motor to keep the sprayer
from tipping, remove the nuts (411, lackwashers
(401,
and capscrews (44) holding the motor mount-
ing plate (721 to the frame. Lift the motor assembly
off the frame.
14.
Remove the mounting plate (72). four screws
(79)
s t a l l them on the new motor.
and lockwashen (63) from the old motor, and in-
r " c A u r l o N
1
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
(441,
lockwashers
(401,
and nuts (41). 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 balls (101 are
in
'
place.
17. Be
sure the bronze-colored washer (27a) is in place
18. Align the gears and push the drive housing (181
19. Starting
at
Step 11 and working backwards, con-
NOTE:
Use e turning motion on
the conduit when
20.
Reinstall the conduit seal h o t shown) around the
wires in the conduit elbow
( 5 4 b )
et the pressure
control to keep contaminants from entering the
pressure control.
21. Reinstall the motor cover and pressure control
cover.
~ ~~ ~~~ ~~ ~~
on the crankshaft
(nl.
straight onto the front end bell and locating pins.
tinue to reassemble the sprayer.
feeding wires through it.
30
307-758