Replacing The Connecting Rod And Bearing - Graco EM 390 Instructions And Parts List

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
Pressure Relief Procedure Warning on page 16
before checking, adjusting, cleaning or shutting off
the sprayer. Unplug the power supply cord.
NOTE: Refer to Fig 20–1 for this procedure unless other-
wise instructed.
1. Remove the displacement pump. See page 18.
2. Remove the front cover (35).
3. Remove the bearing housing screws (20).
4. Slide the bearing and connecting rod assembly (A) off
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).
See page 21.
CAUTION
To extend the service life of the connecting rod
bearing, lubricate it properly. After every 100 hours
of operation, or whenever servicing the pump
(whichever comes first), fill the cavity (E) in the con-
necting 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 (A) onto the drive hous-
ing (55). Assemble the remaining parts.
E
D
LUBRICATE:
See CAUTION
54
C
53
33
34
36
20
35
19
Fig 20–1
55
B
A
18
0075