Tennant 1620 Operator And Parts Manual page 14

OPERATION
5. Inspect spray tips for proper spray pattern:
a. Remove spray bar cover at front of machine.
b. Operate machine in mist mode and observe
spray pattern. Pattern should fan out evenly
across the width of the spray bar (Figure 34).
c. If spray pattern is uneven proceed to next
step.
d. Remove detachable spray bar from machine.
Remove spray tips from spray bar and soak in a
solvent degreaser or a butyl degreaser (such as
"Simple Green" or Commercial Grade "409") for
up to 6 hours. After soaking tips, use a small
brush to remove excess alkaline and rinse
thoroughly. DO NOT use pointed objects to
unplug spray tips (Figure 35).
6. Inspect brushes for wear. Replace if worn.
14
FIG. 33
FIG. 34
FIG. 35
MONTHLY MAINTENANCE
(Every 80 Hours of Operation)
1. Flush out solution system. Pour 11.3L (3 gal) of
hot water into solution tank; do not exceed 60_C
(140_F). Add a solvent degreaser (or a butyl
degreaser) according to mixing directions on
bottle. Over a floor drain, press and hold solution
switch toward the solution flush symbol for 30–60
seconds. Shut off power and let machine sit
overnight. Disperse remaining degreaser and flush
machine with clean water.
FOR SAFETY: When using machine, follow
mixing and handling instructions on chemical
containers.
2. Remove secondary filter, located under battery
compartment hood, and tap out dust.
3. Lubricate front caster grease fitting with a water
resistant grease.
4. Remove right side brush mount plate and inspect
brushes for wear, replace brushes if necessary.
Remove any string or debris entangled around
brushes, pulleys, or posts of mounting plate. Using
a putty knife, scrape any debris from brush
housing.
5. Inspect battery compartment hood gasket for
damage.
6. Check dust skirts at front, rear and sides of main
brushes for wear or damage.
7. Check machine for solution leaks and loose nuts
and bolts.
8. Check static drag chains for wear and floor
contact.
EVERY 250 HOURS OF OPERATION
Check motors for carbon brush wear, replace carbon
brushes if worn to a length of 10mm (0.38 in) or less.
Contact an Authorized Service Center for motor
maintenance.
Tennant 1620 (11–99)