Tennant 255 Series II, Operator'S Manual, Page: 115 / 128

MAINTENANCE
3-55
255 SERIES II MM189 (6---90)
4. Place the scrub brush position lever in the
“normal” position for 15 to 20 seconds, then
return the lever to the “raised” position.
NOTE: If no chalk or other material is available, allow
the brushes to spin approximately two minutes. It will
make a polish mark on the floor.
5. Place the main brush, vacuum fan and filter
shaker switch in the middle position.
6. Release the parking brake and remove the
machine from the test area.
7. The scrub brush pattern should be 2 in
(50 mm) across the full length of the brush.
A
B
00582
NORMAL SCRUB BRUSH PATTERN
A. Scrub Brush Pattern
B. 2 in (50 mm)
To adjust the width of the pattern, adjust the position
of the lift linkage clevis on the threaded stud. Thread
the stud into the clevis to decrease the width. Thread
the stud out of the clevis to increase the width.
A
B
02747
LIFT LINKAGE
A. Clevis
B. Stud
If the brush pattern is tapered more than 0.25 in (5
mm), the scrub brush must be checked to see if it is
cone shaped.
00601
TAPERED SCRUB BRUSH PATTERN
If the brush is not cone shaped, the scrub brush
drive mechanism must be leveled by adding or
removing shims between the scrub brush cross shaft
bearing blocks and the scrub attachment frame.
A
B
C
02771
CROSS SHAFT SHIM
A. Shim
B. Bearing Block
C. Cross Shaft