8-3: Systems Troubleshooting Systems Troubleshooting: 8-2
CHEMICAL SYSTEM
1.0 System will not prime
Possible Cause Solution
1.1 The check valves in
chemical pump are faulty.
Remove the valves and inspect. Clean or replace as
necessary.
1.2 The chemical pump
diaphragm is faulty.
Remove and inspect. Replace as necessary.
1.3 The check valve in high
pressure pump is faulty
(piston which chemical
pump is attached to).
Remove the valve and inspect. Clean or replace as
necessary.
1.4 The lter on feed line in
chemical jug is clogged.
Inspect and clean.
1.5 The feed line from
chemical jug is loose,
pinched or damaged.
Inspect and repair.
1.6 The chemical selector
valve is faulty.
Inspect the valve for leaks between ports. Replace
as necessary.
2.0 Chemical ow is unstable or low
Possible Cause Solution
2.1 Air is in the lines. Check that all ttings and connections are tight and
in good condition. Repair or replace as necessary.
2.2 The lter screen in the
chemical jug is partially
obstructed.
Inspect and clean.
2.3 The chemical selector
valve is faulty.
Inspect the valve for leaks between ports. Replace
as necessary.
2.4 The chemical metering
valve is faulty.
Remove and inspect the valve. Clean or replace as
necessary.
2.5 The high pressure check
valve is faulty.
Remove and inspect the valve. Clean or replace as
necessary.
3.0 Chemical is present in water box
Possible Cause Solution
3.1 The chemical pump
diaphragm is faulty.
Remove and inspect the chemical pump diaphragm.
Replace as necessary.
3.2 The high pressure check
valve is faulty.
Remove and inspect the valve. Clean or replace as
necessary.
HEATING SYSTEM
1.0 Truckmount overheats and shuts down
Possible Cause Solution
1.1 The orice or lter screen
is restricted.
Remove and inspect. Clean as necessary.
1.2 The dump solenoid is
restricted.
Inspect the solenoid and the hose that delivers
water to it. Clean or replace as necessary.
1.3 The dump solenoid is
faulty.
Check the main fuse. If the fuse is blown, inspect
electrical system for worn or shorted wires. Repair
or replace as necessary.
Inspect the solenoid and test for functionality. If the
solenoid is operable, refer to a qualied service
technician to test the temperature controller and
sensor.
2.0 Unable to achieve normal cleaning solution temperature
Possible Cause Solution
2.1 Temperature control knob
is turned down.
Inspect the knob. Adjust if necessary.
2.2 The dump solenoid is
faulty.
Inspect the solenoid and test for functionality. If the
solenoid is operable, refer to a qualied service
technician to test the temperature controller and
sensor.
2.3 Excessive solution ow at
tool.
The cleaning tool jet is too large or worn. Inspect the
jet. Replace if necessary.
2.4 The heat exchanger has
hard water scale buildup.
Descale the system.
2.5 The heat exchanger has
blockage on the exhaust
side.
Inspect the interior of heat exchanger. Remove the
debris and clean as necessary.
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