Vacuum Fan; To Replace Vacuum Fan Impeller - Tennant ATLV 4300 Service Manual

VACUUM FAN

The vacuum fan is mounted to the top of the
hopper assembly. A hydraulic motor is used to
spin the impeller which creates airflow. This
airflow creates vacuum through the vacuum tube
and down to the vacuum head. Debris is brought
up through the vacuum tube and deposited in the
hopper. A screen on the vacuum fan impeller
keeps debris from contacting the impeller.

TO REPLACE VACUUM FAN IMPELLER

FOR SAFETY: Before Leaving Or
Servicing Machine; Stop On Level
Surface, Set Parking Brake.
NOTE: Anytime hopper or vacuum system parts
are serviced the seals should be inspected and
replaced if necessary.
1. Remove the six screws holding the vacuum
fan motor cover plate to the top of the
plenum assembly on top of the hopper
cover. Remove the plate.
NOTE: Observe hydraulic cleanliness
requirements when opening hydraulic lines.
2. Mark, disconnect, and plug the hydraulic
lines leading to the vacuum fan motor.
3. Open the hopper cover and tilt the hopper
back.
4. Go under the hopper cover and remove the
six hex screws holding the cover assembly
to the hopper plenum. Remove the cover
assembly.
5. Go back under the hopper plenum and
locate the vacuum fan impeller screen.
Remove the three flat head screws and the
one hex screw holding the screen to the
impeller.
6. Pull the impeller screen, spacer, and sleeve
off the vacuum fan motor shaft.
7. Remove the four hex screws holding the
vacuum fan assembly retainer plate to the
bottom of the hopper plenum.
ATLV 4300 330495 (10- -98)
VACUUMING
3-15