Tennant 7400, Service Manual

Page: 168 / 322

HYDRAULICS
5-26
7400 MM428 (12--98)
12. Remove the four hex screws holding each
brush motor to the motor plate.
NOTE: Make sure to note the orientation of the
motor and fittings before removing the motors
from the plate.
13. Remove the fittings from the old motor and
install in the new motor in the same
orientation.
14. Install the new brush motor and fittings in
the motor plate in the same orientation as
the old motor.
15. Reinstall the four hex screws and tighten to
37 -- 48 Nm (26 -- 34 ft lb).
16. Reinstall the steel hydraulic tube running
between the brush drive motors.
NOTE : Observe hydraulic cleanliness
requirements when opening hydraulic lines.
17. Reinstall the square key on the tapered
motor shaft. Put a small amount of grease
on the taper of the shaft.
18. Reinstall the drive plugs, washers, and
castle nuts. Hold the plug from turning and
tighten the castle nut down to 37 -- 48 Nm
(26 -- 34 ft lb) and then until the slot in the
nut lines up with the hole in the shaft. Install
a new cotter pin.
19. Position the motor plate assembly back in
the machine.
NOTE: Lift up on the brush wrap slightly when
installing the motor plate in the machine so the
attachment pins line up with the holes in the plate.
20. Reinstall the two hair pins in the brush wrap
attachment pins.
21. Reconnect the hydraulic hoses to the brush
motors. See schematic in this section.
NOTE : Observe hydraulic cleanliness
requirements when opening hydraulic lines.
22. Reinstall the brush arm and C--clip to the
motor plate if they were removed earlier.
23. Align the two pins on the lift tube with the
two holes in the brush arm.