Owner manual

TROUBLESHOOTING - DIESEL
APEX 86037630
7-15
PROBLEM CAUSE SOLUTION
Starter turns over engine, but
will not start
Engine is malfunctioning
Refer to Kubota Engine Operation and
Maintenance Manual.
Engine is out of fuel Add fuel to the fuel tank.
Waste tank is full Empty waste tank.
Main or engine circuit breaker on
the control panel has been
tripped.
After inspecting the unit to determine the
cause of the tripped circuit breaker, press
the reset button.
Engine coolant temperture has
exceeded 240°F, triggering the
high temperature switch to shut
the unit down.
Determine the cause of the overheating
before restarting the unit. Refer to the
Kubota Engine Operation and
Maintenance Manual.
Defective fuel pump. Replace fuel pump.
Defective float switch inside the
waste tank.
Check switch for proper operaton.
Replace as necessary.
Defective 240°F engine coolant
high-temperature shudown switch.
Test switch. If necessary, replace.
Oil pressure switch on engine has
shut down, due to insufficient oil
pressure.
Refer to the Kubota Engine Operation
and Maintenance Manual. DO NOT
restart the engine until the cause is
determined and corrected.
Engine stops running
while doing normal cleaning,
the engine stops running
Engine is malfunctioning.
Refer to the Kubota Engine Operation
and Maintenance Manual.
Flow restriction caused by hard
water scaling.
Descale unit, repair or replace damaged
plumbing components as necessary.
Install water softener.
Excessive heating
Not enough water flow. Check jet size of tool.
Heat exchanger leaks
NOTE: The exhaust heat
exchanger will produce
water condensation
discharge at times during
normal operation. DO NOT
confuse this with a leak.
Engine/vacuum exhaust heat
exchangers are damaged from
frozen water.
Inspect heat exchangers for leaks.
Visually inspect for damage. Pressure
check after removing from the unit.
(Maximum test pressure 1200 PSI for
stainless steel heat exchanger)
(Maximum test pressure 100 psi for
copper heat exchanger)
Heat Exchangers are plugged with
carbon.
Clean and replace.
Temperature relief valve on water
box is stuck open.
Clean temperature relief valve and test.
Replace, if necessary.
Engine RPM is low. Reset engine RPM.
Loss of temperature
The heat output of the unit is
LESS than normal.
Defective temperature gauge.
Test gauge and sensor. Replace failed
component.
Defective waste pump float
switch.
Replace float switch.
Broken diaphragm. Replace diaphragm.
Weak battery.
Charge or replace battery if needed.
Check charging station.
Automatic waste pump is
malfunctioning or not
operating normally
NOTE: When replacing
either the pump or float
switch, use new electrical
connectors and heat shrink.
Inspect connection for
watertight seal.
Pump-out circuit breaker on
control panel has been tripped.
After inspecting waste pump to determine
the cause of the tripped circuit breaker,
press the reset button.