Operating instructions

MAINTENANCE
980076 08/26/03
4-14
PROBLEM CAUSE SOLUTION
Vacuum gauge is giving an
improper reading.
Examine the tubing between the
vacuum valve and the vacuum gauge
and remove any blockage.
Vacuum hose(s) is damaged,
causing a suction leak.
Inspect the vacuum hose(s). Repair
any damage or replace.
Waste tank gasket not sealing
properly, not positioned
properly.
Inspect the gasket. Repair seal or
replace. Re-position lid.
Plugged vacuum hose or
vacuum plumbing between
vacuum inlet and strainer
basket.
Unplug vacuum hose or inlet plumbing.
Waste tank filter or strainer
basket is plugged.
Clean or replace filter. Clean basket.
Loose vacuum pump drive
belts.
Tighten the drive belts.
Waste tank drain valve is
damaged or left open, causing
a vacuum leak.
Drain the waste tank. Close drain
valve, if open. Remove the dump
valve and after inspecting replace the
defective components.
Vacuum relief valve requires
adjustment or has a vacuum
leak due to damaged
diaphragm.
Re-adjust the vacuum relief valve. If
the vacuum does not increase, remove
and inspect the relief valve diaphragm.
If damaged, replace.
Loss if vacuum while cleaning, the
vacuum is not up to par. Engine RPM
is normal.
Vacuum pump worn out. Replace vacuum pump.
Chemical pump is improperly
primed.
Refer to chemical pump primping
instructions.
The strainer at the inlet end of
the chemical inlet line is
clogged.
Unclog the strainer. If damaged,
replace.
Suction leak in the inlet line
leading into the chemical
pump.
Inspect inlet lines and flow meter for
damage and replace, if required.
Chemical pump check valve(s)
is clogged.
Remove any debris from the chemical
check valve(s). Replace chemical
check valve(s) or seals if necessary.
Chemical prime-on-off valve or
chemical metering valve is
defective.
Replace valve(s).
Chemical pump diaphragm is
ruptured.
Disassemble the chemical pump and
replace the damaged diaphragm.
Loss of chemical with cleaning tool
valve open, no chemical
Defective cylinder in the water
pump.
Measure the pump volume. If the
pump volume is less than normal, refer
to “Loss of Pump Volume” in the
“Troubleshooting” section in this
manual.