Replacing The Drive Assembly - Graco EM 390 Instructions And Parts List

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 21–1 for this procedure.
1. Remove the front cover (35). Remove the displace-
ment pump. See page 18.
2. Remove the two screws (20). Pull the connecting rod
and bearing assembly (C) off the crankshaft (D).
18
20
35
19
55a
55d
Fig 21–1

REPLACING THE DRIVE ASSEMBLY

LUBRICATE AS
EXPLAINED IN STEP 5
55e
55b
55c
D
C
113
UPRIGHT SPRAYER
3. Remove the screws (55d and 55f) and pull the drive
housing (A) off the motor housing (B).
4. Remove the screws (55c) and pull the motor housing
(B) off the motor (23).
5. Clean the gear (37) and inspect it for wear or damage.
Replace if necessary. To remove, drive out the pin
(27) and pull the gear off the motor shaft (E). Apply
molybdenum disulfide spray lubricant to the gear, al-
low to dry, then apply industrial-grade, heavy-duty,
extreme-pressure, lithium-soap grease.
6. Install the new drive assembly in the reverse order of
removal.
23
E
27
37
55f
B
A
55a
55d
LO-BOY SPRAYER
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