Technical data

parts or electric shock. Unplug the sprayer1
1. Stop the sprayer at the bottom of its stroke to get
the crank (El in its lowest position. If the crank (El
must be lowered manually, carefully rotate the
blades of the fan with a screwdriver.
2. Remove the front cover and screws (31, 32).
3. Unscrew the suction tube (421 from the pump,
holding a wrench on the pump intake valve to keep
the pump from loosening.
4. Disconnect the pump outlet hose (47) from the
displacement pump outlet nipple (46).
5. Use a screwdriver to push aside the retaining spring
(35) at the top of the pump. Push the pin (201 out
the rear.
6. Loosen the jam nut (38) with an adjustable wrench.
Unscrew and remove the displacement pump.
7. Use a 3/W’ hex key wrench to remove the four
screws (33) and lockwashers (49) from the bearing
housing.
8. Lightly tap the lower rear of the bearing housing
(27) with a plastic mallet to loosen it from the drive
housing. Then pull the bearing housing and the
connecting rod assembly (29) straight off the drive
housing.
9. Inspect the crank (El for excessive wear and replace
parts as needed.
10. Evenly lubricate the inside of the bronze bearing in
the bearing housing with high quality motor oil.
Liberally pack the roller bearing in the connecting
rod assembly (29) with bearing grease.
11. t;Iemble the connecting rod and bearing housing
12. Clean the mating surfaces of the bearing and drive
housings.
13. Align the connecting rod with the crank (El and
carefully align the locating pins in the drive housing
with the holes in the front cover (31). Push the
bearing housing onto the drive housing or tap it into
place with a plastic mallet.
14. Install the screws (33) and lockwashers (491 on the
bearing housing and tighten evenly.
15. Screw the displacement pump about 314 of the
way into the bearing housing (18). Hold the pin (26)
up to the pin hole in the connecting rod assembly
(29) and continue screwing in the pump until the
pin slides easily into the hole. Back off the pump
until the top threads of the pump cylinder are flush
with the face of the bearing housing and the outlet
nipple (46) is facing back. Push the retaining spring
(35) into the groove all the way around the connect-
ing rod. Tighten the locknut (38) very tight-about
7585 ft-lb (102-115 N-ml-with a 2 in. open end
wrench and a light hammer. See Fig 20.
20 826-647
42
38
T%zlY:bTo
HO&lid N-m)
Rg 21
WARNING
Be sure the retaining spring (35) is firmly in the
groove of the connecting rod, all the way around,
to prevent the pin 120) from working loose due to
vibration. See Fig 21.
If the pin works loose, it or other parts could break
off due to the force of the pumping action. These
parts could be projected through the air and result
in serious bodily injury or property damage, in-
cluding damage to the pump, connecting rod or
bearing housing.
16. Reinstall the front cover and screws (31,321. Recon-
nect the suction tube (42) and pump outlet hose
1471.