REPLACING THE DRIVE ASSEMBLY

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).

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.

20

35

19

LUBRICATE AS

23

EXPLAINED IN STEP 5

E

27

 

 

37

55f

 

55e

 

55b

 

55c

 

D

 

C

18

 

 

 

B

 

 

A

55d

55a

 

 

LO-BOY SPRAYER

 

 

 

 

113

 

55a

55d

UPRIGHT SPRAYER

Fig 21±1

0674

 

307-724 21

Page 21
Image 21
Graco Inc EM390 instruction manual Replacing the Drive Assembly, 55d 55a