Tennant 235, Operator'S Manual

Page: 70 / 82

MAINTENANCE
235 MM166 (3--94)
3-34
BRUSHES
MAIN BRUSH
The main brush is tubular and spans the width of
the machine, sweeping debris into the debris
hopper. The brush should be inspected daily for
wear or damage. Remove any string or wire found
tangled on the main brush, main brush drive hub,
or main brush idler hub.
Rotate the main brush end-for-end after every
50 hours of operation for maximum brush life and
best sweeping performance. Check the main
brush pattern whenever installing a new brush.
The main brush should be replaced when the
remaining bristles measure 1.5 in (40 mm) or less
in length.
TO REMOVE MAIN BRUSH
1. Stop engine and set the machine parking
brake.
FOR SAFETY: Before Leaving Or Servicing
Machine; Stop On Level Surface, Set Parking
Brake, Turn Off Machine And Remove Key.
2. Lower the main brush.
3. Remove the right side access door.
4. Remove the brush idler arm retaining bolt
from the arm hub.
B
A
C
D
03390
MAIN BRUSH IDLER ARM
A. Brush Idler Arm
B. Arm Retaining Bolt
C. Main Brush
D. Threaded Hole
5. Pull the brush idler arm off the arm hub.
NOTE: If the brush idler arm does not come off
easily, thread the retaining bolt into the threaded
hole on the arm. Tighten the bolt until it is tight
against the backing plate. Push on the brush end
of the arm and retighten the bolt. Repeat until the
arm is loose.
6. Grasp the main brush, pull it off the brush
drive plug, and out of the main brush
compartment.
TO INSTALL MAIN BRUSH
1. Push the main brush lever into the “UP”
position.
2. Slide the main brush into the main brush
compartment.
3. Align the main brush drive slots with the
drive keys on the main brush drive plug.
4. Slide the main brush onto the drive plug.
Make sure the drive slots and keys mate.
5. Align the main brush idler plug slots with the
main brush keys. Slide the main brush idler
plug into the main brush tube.
6. Slide the brush idler arm onto the arm hub.
7. Thread the brush idler arm retaining bolt
through the idler arm and into the arm hub.
8. Tighten the brush idler arm retaining bolt.
9. Replace the right side access door.
TO CHECK AND ADJUST MAIN BRUSH
PATTERN
1. Apply chalk, or some other material that will
not blow away easily, to a smooth, level
floor.
2. With the side brush and main brush raised,
position the main brush over the chalked
area.
3. While keeping a foot on the brakes to keep
the machine from moving, lower the main
brush to the floor for 15 to 20 seconds; raise
the main brush and drive the machine off the
test area.