Tennant 255 Series II, Operator'S Manual, Page: 104 / 128

MAINTENANCE
255 SERIES II MM189 (6---90)
3-44
BRUSHES
MAIN BRUSH
The main brush is tubular and spans the width of the
machine, sweeping debris into the debris hopper. It
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.
The main brush pattern should be checked daily. It
should be 2.5 in (65 mm) wide for indoor
applications and 3.5 in (90 mm) for outdoor
applications with the main brush in the “normal”
position. Main brush pattern adjustments are made
by turning the height adjustment knob behind the
side shroud next to the operator’s left leg.
The main brush should be replaced when the
remaining bristles measure 1.25 in (30 mm) in
length.
TO REPLACE MAIN BRUSH
1. Stop the engine and set the machine parking
brake.
FOR SAFETY: Before leaving or servicing
machine; stop on level surface, set parking brake,
and turn off machine.
2. Place the main brush position lever in the (Main
Brush Down) position.
3. Open the right side main brush door.
4. Remove the brush idler arm retaining bolt from
the arm hub.
A
B
C
00599
REMOVING BRUSH IDLER ARM
A. Brush Idler Arm
B. Arm Retaining Bolt
C. Plastic Screw
5. Pull the brush idler arm off the arm hub.
NOTE: If the brush idler arm does not come off easily,
remove the plastic screw located next to the brush
idler arm retaining bolt. Thread the brush idler arm
retaining bolt into the threaded hole where the plastic
screw was mounted. Tighten the retaining bolt until it
forces the brush idler arm loose. Remove the brush
idler arm retaining bolt and reinstall the plastic screw.