OPERATION
10
Tennant 1520 (10–01)
WEEKLY MAINTENANCE
(Every 20 Hours of Operation)
1.
Remove inline strainer filter and rinse out. Make
sure solution tank is empty before removing filter.
Filter is located under machine at rear (Figure 16).
FIG. 16
2.
Inspect spray tips for proper spray pattern:
a.
Lower brush/pickup head and remove
detachable spray bar from brush base. Do not
disconnect bar from quick coupler. Raise
brush after removing spray bar (Figure 17).
b.
Turn the speed control knob to slowest setting
to minimize machine travel during inspection.
c.
Turn the main power and pump switches on.
d.
Holding the spray bar off the floor, briefly
rotate control grips and observe spray pattern.
Pattern should fan out evenly across the width
of the spray bar (Figure 17).
e.
Clean or replace defective twist-out spray tips
if necessary (See Monthly Maintenance).
FIG. 17
MONTHLY MAINTENANCE
(Every 80 Hours of Operation)
1.
Flush chemical buildup from tanks and solution
lines. Follow procedure below:
a.
Drain all water from machine.
b.
Over a floor drain, carefully jack up the
machine so the drive wheels are just off the
floor. Use a block of wood for jacking. Make
sure to stay clear of the brush area when
jacking (Figure 18). The machine drive wheels
must spin freely during the flushing procedure.
89mm
(3.5 in)
FIG. 18
c.
Pour 750 ml (24 oz) of an acetic acid solution
with 11.3 ltr (3 gal) of hot water into solution
tank; do not exceed 60
_
C (140
_
F).
FOR SAFETY: When using machine, follow mixing
and handling instructions on chemical containers.
WARNING: Flammable materials can cause
an explosion or fire. Do not use flammable
materials in tank(s).
d.
Turn on the main and pump switches and
select the Restorative Cleaning Mode.
e.
Rotate the control grips and hold for one to
two minutes. As a safety precaution, turn the
speed control knob to the slowest setting.
f.
Shut off power, unplug machine and let
machine set overnight to allow acetic acid
solution to breakdown chemical buildup.
g.
Next day, while machine is still jacked up,
disperse remaining acetic acid solution.
h.
Then rinse out solution tank and solution lines
with clean water.
