Graco ULTRA 500 Instructions-Parts List Manual page 28

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CONNECTING ROD, DRIVE HOUSING, or CRANKSHAFT REPLACEMENT
WARNING
the risk of an injection injury, injury from moving
Relief Procedure Warnlng on page 13 to reduce
parts or electric shock.
1. Stop the sprayer st the bottom of its stroke to get
the crank (27) in
i t s
lowest position. If the crank
must be lowered manually, carefully rotate the
blades of the fen with a screwdriver.
2. Remove the front cover (311, pail hanger
(a),
end
screws (32).
3. Unscrew the suction tube (42) from the pump,
holding a wrench on the pump Intake valve to keep
the pump from loosening.
4.
Disconnect the pump outlet hose (471 from the
outlet nipple
(46).
5.
Use
a screwdriver to push aside the retaining spring
the rear.
(36) at the top of the pump. Push the pin (20) out
8. Loosen the jam nut (38) with an adjustable wrench.
Unscrew end remove the displacement pump.
7. Use a 3 / 1 6 hex key wrench to remove the three
screws and lockwashers
( 3 0 , 6 3 1
from the recess of
the drive housing (18).
8. Use a 5/32" hex key wrench to remove the two
screws and lockwashers (21,
831
from the top rear
o f the front end bell (E).
9. Lightly tap the lower rear of the drive housing with
a plastic mallet to loosen it from the motor front end
bell.
Then pull the housing off.
CAUTION
removing the drive housing (18). It is easi&
DO NOT ellow the gear cluster (9) to fell when
damaged if dropped.
DO NOT lose the thrust balls (10) located at each
end of the gear cluster
(9)
or allow them to fall be-
with grease, usually stays in the shaft recesses,
tween gears. The ball, which is heavily covered
but could
be
dislodged. If caught between gears
the drive housing. if the balls ere not in place, the
and not removed, the bells will seriously damage
bearings
will
wear prematurely.
10. Inspect the drive housing for damage and replace if
needed.
11. Pull the crankshaft (27) out. Inspect for wear or
damage and replace, if needed. Be sure a washer
assembly.
(27a.
27bl is placed on each side of the crankshaft
12. Remove the connecting rod
(291,
inspect for wear
or damage, and replace if needed.
13. Evenly lubricate the inside of the bronze bearing in
the drive housing (18) with high quality motor oil.
Liberally pack the roller bearings and gears with
beating grease.
14. Install the connecting rod (29).
15. install the crankshaft (27). meshing the gears.
16. Clean the mating surfaces of the drive housing (18)
and front end bell (E).
17. Carefully align the drive housing and front end bell
with the locating pins, then push the drive housing
onto the end bell or tap it into place with a plastic
mallet.
18. Install the screws and lockwashers
(30,
631
and
tighten evenly.
CAUTION
align or seat the housing, which would cause im-
DO NOT use the drive housing screws to try to
proper alignment and premature bearing wear.
.