Graco 231-032 A Series Instructions And Parts List page 28

WARNING
follow the Pressure
Relief Procedure Warning on page 13 to reduce
the risk of an injection injury, injury from moving
parts or electric shock.
~
1. Stop the sprayer at the bottom of its stroke to get
the crank
(271 in
its lowest position. If the crank
must be lowered manually, carefully rotate the
blades of the fen with e screwdriver.
2. Remove the front cover (31). pail hanger
(821,
and
screws
(321.
3. Unscrew the suction tube
(421
from the pump,
holding a wrench on the pump intake valve to k w p
the pump from loosening.
4. Disconnect the pump outlet hose (471 from the
outlet nipple
(461.
5. Use a screwdriver to push aside the retaining spring
(351
at the top of the pump. Push the pin
(20)
out
the rear.
6.
Loosen the jam nut
(381
with en adjustable wrench.
Unscrew and remove the displacement pump.
7. U& a 3 / 1 6 hex key wrench to remove the three
screws and lockwashers
(30,631
from the recesa of
the drive housing (181.
8. Use e 5/32" hex key wrench to remove the two
screws end lockwashers (21, 63) from the top rear
of the front end bell (E).
9. Lightly t a ~ the lower rear of the drive housina with
a plastic mallet to loosen it from the motor front end
bell. Then pull the housing off.
CAUTION
DO NOT ellow the gear cluster (9) to fall when
removing the drive housing (18). It is eesiM
damaged if dropped.
end of the gear cluster
(9) or ellow them to fall be-
DO NOT lose the thrust balls (101 located at each
tween gears. The ball,
which is heavily covered
with grease, usually
stays
in the shaft recesses,
but could be dislodged. If caught between gears
and not removed, the balls will seriously damage
the drive housing. If the bells are not in place, the
bearings will wear prematurely.
23
10. Inspect the drive housing for damage end replace
if
needed.
11. Pull the crankshaft (27) out. Inspect for wear or
damage and replace, if needed. Be sure a washer
(ma,
27bl is placed on each side of the crankshaft
assembly.
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.
bearing grease.
Liberally pack the roller bearings and gears with
14. Install the connecting rod (29).
15. Install the crankshaft
(271,
meshing the gears.
16. Clean the mating surfaces of the drive housing (181
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 piece with a plastic
mallet.
18. Install the screws and lockwashers
130,
63) and
tighten evenly.
CAUTION
DO NOT use~the drive housing screws to try to
align or seat the housing, which would cause im-
proper alignment and premature bearing weer.