32
307–758
DRIVE HOUSING, CONNECTING ROD & CRANKSHAFT REPLACEMENT
WARNING
To reduce the risk of serious injury, follow the illus-
trated Pressure Relief Procedure warning on
page 24 whenever you are instructed to relieve
pressure.
NOTE: Read the GENERAL REPAIR INFORMATION
on page 24 before doing this procedure.
NOTE: Stop the sprayer at the bottom of its stroke to
get the crankshaft (69) in its lowest position.
To lower the crankshaft manually, carefully ro-
tate the blades of the motor fan with a screw-
driver.
NOTE:
Refer to Fig 26 unless otherwise noted.
1.
Remove the front cover.
2. Hold a wrench on the pump intake valve and unscrew
the suction tube.
3. Disconnect the hose (68) from the pump.
4. Use a screwdriver to push up the retaining spring
(42). Push the pin (43) out the rear. See Fig 32–1.
42
70
43
73
41
25,18
Fig 32–1
Fig 32–1
Turn the displacement rod
so the pin hole faces
straight back. Insert a hex
key wrench through the
hole to unscrew the screw
(25).
01579
5. Loosen the jam nut (41) with an adjustable wrench.
Unscrew and remove the pump.
6.
See Fig 32–1 to remove one of the screws (25) which
is hidden.
Remove the other two screws (25) from
the recess of the drive housing. See Fig 26.
7.
Remove the motor shield (58).
8.
Remove the two screws (14) holding the motor (75)
to the drive housing (73).
9. Lightly tap the lower rear of the drive housing (73)
with a plastic mallet to loosen it from the front of the
motor. Then pull the drive housing straight off.
Do not allow the gear (71) to fall. It may stay attached
to the drive housing or to the motor.
Do not lose the thrust balls (8) located at each end of
the gear (71). The balls are heavily covered with
grease and usually stay in the shaft recesses, but
they could be dislodged. If caught between the gears
and not removed, the balls will damage the drive
housing. If the balls are not in place, the bearings will
wear prematurely.
CAUTION
10. Inspect the drive housing (73) for excessive wear
and replace parts as needed.
11. Pull the crankshaft (69) out. Inspect it for wear or
damage and replace it, if necessary. Be sure the
thrust bearings (69a and 69b) are in the proper place
on crankshaft.
12. Remove the connecting rod (70). Inspect it for wear
or damage. Replace the rod, if necessary.
13. Evenly lubricate the inside of the bronze bearing in
the drive housing with high quality motor oil. Liberally
pack the roller bearing and gears with bearing
grease.
14. Carefully align the drive housing and front of the mo-
tor with the locating pins. Push the drive housing onto
the motor, or tap it into place with a plastic
mallet.
DO NOT use the drive housing screws (25) to try to
align or seat the housing to the motor; doing so will
not ensure proper alignment, but will cause prema-
ture bearing wear.
CAUTION
15. Install the screws (14 and 25) and lockwashers (18)
on the drive housing and tighten evenly.
16. Reinstall the motor shield (58).
