Bearing Housing Connecting Rod Replacement - Graco 231–081 Instructions And Parts List

BEARING HOUSING & CONNECTING ROD REPLACEMENT
WARNING
Before doing this procedure, follow the Pressure
Relief Procedure Warning on page 23 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!
29
49
33
31
32
35
20
38
39
42
7
Fig 23
NOTE: Stop the sprayer at the bottom of its stroke to get
the crank (E) in its lowest position.T o lower the
crank manually, carefully rotate the blades of the
fan with a screwdriver.
1. Remove the front cover (31). Hold a wrench on the
pump intake valve and unscrew the pump suction
tube (42). Disconnect the pump outlet hose (47).
2. Use a screwdriver to push up the retaining spring
(35). Push the pin (20) out the rear.
3. Loosen the pump jam nut (38) with 2 in. wrench. Un-
screw the displacement pump (39).
4. Remove the four screws (33) and lockwashers (49)
from the bearing housing (27).
5. Lightly tap the lower rear of the bearing housing (27)
with a plastic mallet to loosen it from the drive hous-
ing (2). Pull the bearing housing and the connecting
rod assembly (3) straight off the drive housing.
6. Remove the pail bracket assembly (B) and reinstall it
on the new bearing housing.
307–920
18
E
27
47
7. Inspect the crank (E) for excessive wear and replace
parts as needed. Evenly lubricate the inside of the
bronze bearing (B) with motor oil. Liberally pack the
roller bearing (C) with bearing grease.
8. Assemble the connecting rod (29) and bearing hous-
ing (27).
9. Clean the mating surfaces of the bearing and drive
housings.
10. Align the connecting rod with the crank (E) and care-
fully align the locating pins in the drive housing with
the holes in the bearing housing (27). Push the bear-
ing housing onto the drive housing or tap it into place
with a plastic mallet.
CAUTION
DO NOT use the bearing housing screws (33) to try
to align or seat the bearing housing; the bearing and
drive housing will not align properly and will result in
premature bearing wear.
11. Install the bearing housing and tighten the screws
evenly to 115 to 135 in–lb (13–16 N.m).
12. Screw the displacement pump 3/4 of the way into the
bearing housing (27). Hold the pin (20) up to the pin
hole in the connecting rod (3). Screw in the pump un-
til the pin slides easily into the hole. Back of
pump until the top threads of the pump cylinder are
flush with the face of the bearing housing and the out-
let adapter (A) is facing back. Push the
spring (35) into the groove all the way around the
connecting rod. Tighten the locknut (38) very tight –
about 75–85 ft–lb (102 to 115 N.m) – with a 2 in. open
end wrench and a light hammer. See Fig 24.
WARNING
Be sure the retaining spring (35) is firmly in the
groove all the way around, to prevent the pin (20)
from working loose due to vibration. See Fig 24.
If the pin works loose, it or other parts could break off
due to the force of the pump action. These parts
could be projected through the air and result in seri-
ous bodily injury or property damage, including dam-
age to the pump connecting rod or bearing housing.
13. Reinstall the front cover (31), the suction tube (115)
and the outlet hose (47). See Fig 23.
3
FACE OF
BEARING
HOUSING
Fig 24
f the
retaining
20
35
27
38
TORQUE TO
75–85 ft–lb
(102–115 N.M)