Troubleshooting - Prochem LEGEND GT Operating Instructions Manual

PROBLEM
Loss of vacuum
While cleaning, the vacuum is
not up to specification. Engine
RPM is normal.
Excessive Vacuum
Loss of chemical
With the cleaning tool valve
open, no chemical
CAUSE
Vacuum gauge is giving an improper
reading.
Vacuum hose(s) is damaged,
causing a suction leak.
Waste tank gaskets not sealing
properly, not positioned properly
Plugged vacuum hose or vacuum
plumbing between vacuum inlet and
strainer basket.
Waste tank filter or strainer basket is
plugged.
Loose vacuum pump drive belts.
Waste tank drain valve is damaged
or left open, causing a vacuum leak.
Vacuum relief valve requires
adjustment or has a vacuum leak
due to damaged diaphragm.
Vacuum exhaust heat exchangers
are plugged with lint.
Vacuum pump is worn out.
Improper throttle adjustment.
Vacuum obstruction
Vacuum relief valve requires
adjustment.
Chemical pump is improperly
primed.
The strainer at the inlet end of the
chemical inlet line is clogged
Suction leak in the inlet line leading
into the chemical pump.
Chemical pump check valve(s) is
clogged
Chemical prime/on-off valve or
chemical metering valve is defective.
Chemical pump diaphragm is
ruptured.
Defective cylinder in the water pump.
86313050 LEGEND GT 09/12/08
MAINTENANCE
SOLUTION
Examine the tubing between the vacuum
relief valve and the vacuum gauge and
remove any blockage.
Inspect hose(s), repair or replace.
Inspect the gasket. Repair seal or replace
Re-position lid(s).
Unplug vacuum hose or inlet plumbing.
Clean or replace filter. Clean strainer
basket.
Tighten the drive belts
Drain the waste tank. Close drain valve, if
open. Remove the dump valve and, after
inspecting, replace the defective
components.
Re-adjust the vacuum relief valve. If the
vacuum does not increase, remove and
inspect the relief valve diaphragm. If
damaged, replace
Remove and clean.
Replace the vacuum pump.
Adjust throttle to set desired vacuum
pressure.
Inspect hoses for obstructions.
Readjust the vacuum relief valve.
Refer to chemical pump priming
instructions.
Unclog the strainer. If damaged, replace.
Inspect inlet lines and flow meter for air
leaks or damage and replace, if required.
Remove any debris from the chemical
check valve(s). Replace chemical check
valve(s) or seals, if necessary.
Replace valve(s).
Disassemble the chemical pump and
replace the damaged diaphragm.
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.
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