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307-735
18
REPLACING
THE CONNECTING ROD and BEARING
WARNING
To
reduce the risk of serious bodily injury
,
including
fluid
injection or splashing in the eyes or on the skin,
or
injury from moving
parts, always follow the
Pres-
sure Relief Procedure Warning on page 14 be-
fore
checking, adjusting, cleaning or shutting of
f
the
sprayer.
Unplug the power supply cord.
NOTE: Refer to Fig 16 for this procedure unless other-
wise
instructed.
1.
Remove pump as described on page 16.
2.
Remove the front cover (35).
3.
Remove the bearing housing screws (20).
4. Slide
the bearing and
connecting rod assembly (A) of
f
the
crankshaft (B).
5. Use a screwdriver to push the retaining spring (33)
up.
Remove the pin (34) and the coupling (36).
6. Clean
and inspect the bearing housing (53) and con
-
necting
rod (54), including
the needle bearing (D). Re
-
place
both parts if either is worn or damaged.
7. Clean
and
inspect the crankshaft (B). Wipe the crank
-
shaft
clean with a rag (don’t
use solvent). If the crank
-
shaft is badly worn, replace the drive assembly (55)
as
described on page 19.
CAUTION
To
extend the service life of the connecting rod
bear
-
ing, lubricate it properly
. After every
100
hours of op
-
eration, or whenever servicing
the pump (whichever
comes
first), fill the cavity (E) in the connecting rod
(54)
with SAE non–detergent motor oil.
8. Coat the surfaces of the new connecting rod and
bearing
(C) with SAE non–detergent motor oil. Liber
-
ally
pack the needle bearing (D) with
industrial-grade,
heavy-duty,
extreme-pressure, lithium-soap grease.
9. Assemble the connecting rod (54) and bearing (53).
Assemble
the coupling (36)
to the connecting rod and
install the pin (34). Push the spring (33) over both
ends
of the pin (34).
10. Align
the connecting rod (54) with the crankshaft (B)
and
push the bearing housing onto the drive housing
(55).
Assemble the remaining parts.
53
Fig 16
55
18
20
35
19
34
36
33
LUBRICATE:
See CAUTION
54
A
B
C
DE