Hitachi EM 490 - Manual (Page 19)

307-735 19
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.
Fig 17
55c
55b
27
55f
55e
55b
55c
55a
55d
B
A
55g
Apply molybdenum disulfide spray
lubricant; allow to dry;
then apply industrial-grade,
heavy-duty, extreme-pressure,
lithium-soap grease
37
D
C
20
E