Hitachi EM 490 dimensions Replacing the Drive Assembly

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 Pres- sure Relief Procedure Warning on page 14 be- fore checking, adjusting, cleaning or shutting off the sprayer. Unplug the power supply cord.

NOTE: Refer to Fig 17 for this procedure.

1.Remove the displacement pump. See page 16.

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.

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.

55f	27 E
55e

B

55b

55c

A

D

C

20 55b

55c

55g

55a

55d

37

Apply molybdenum disulfide spray lubricant; allow to dry;

then apply industrial-grade, heavy-duty, extreme-pressure, lithium-soap grease

Fig 17

307-735 19