Tennant ATLV 4300 Service Manual page 96

ELECTRICAL
With the engine off , First check to make sure that:
1.The vacuum fan rotates free.
2. The hydraulic oil level is correct.
3. The hopper is not full.
Checking for battery voltage to the vacuum fan switch:
With the key switch in the on position and the engine NOT running , check for
battery voltage between the 3//BLU wire at the vacuum fan switch
BLK wire.
no battery
voltage
Reset or replace if
defective, CB- -1
circuit breaker.
Replace if the defective
ok
Replace if the defective thermal sentry
4-28
no
battery
voltage
present
Checking the vacuum switch:
With the key switch in the on position
switch and check for battery voltage between wire 18/GRN at the vacuum switch and any
13/BLK wire..
no battery
voltage
Vacuum fan switch.
switch.
ok
Vacuum fan runs
VACUUM FAN WILL NOT RUN
Is the optional thermal
sentry light on?
Make sure the key switch is off with
the engine NOT running, check for
possible fire or high temperatures in
and any 13/
the hopper cover area !!!
and the engine NOT running , turn on the vacuum
battery
voltage
present
Checking the thermal sentry switch:
With the key switch in the on position
running , turn on the vacuum switch and check for battery
voltage between wire 18/GRN at the vacuum switch and 20/BRN
at the thermal sentry switch.
no battery
voltage
Replace if the defective vacuum fan
yes
and the engine NOT
battery
voltage
present
solenoid valve coil.
ok
ATLV 4300 330495 (10- -98)