Prochem Legend GT - Manual (Page 49)

47
Maintenance
PROBLEM CAUSE SOLUTION
Loss of vacuum
While cleaning, the
vacuum is not up to
specification. Engine
RPM is normal.
Vacuum gauge is giving an improper
reading.
Examine the tubing between the vacuum
relief valve and the vacuum gauge and
remove any blockage.
Vacuum hose(s) is damaged, causing a
suction leak.
Inspect hose(s), repair or replace.
Waste tank gaskets not sealing properly, not
positioned properly
Inspect the gaskets. Repair or replace
gaskets as necessary. Re-position lid, inlet
and outlet.
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 strainer basket.
Loose vacuum pump drive belts. Tighten the drive belts
Waste tank drain valve is damaged or left
open, causing a vacuum leak.
Close drain valve, if open. Remove the drain
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
Vacuum exhaust heat exchangers are
plugged with lint.
Remove and clean.
Vacuum pump is worn out. Replace the vacuum pump.
Excessive Vacuum
Improper throttle adjustment.
Adjust throttle to set desired vacuum
pressure.
Vacuum obstruction Inspect hoses for obstructions.
Vacuum relief valve requires adjustment. Readjust the vacuum relief valve.
Loss of chemical
With the cleaning tool
valve open, no
chemical
Chemical pump is improperly primed. Refer to chemical pump priming instructions.
The strainer at the inlet end of the chemical
inlet tube is clogged
Unclog the strainer. If damaged, replace.
Suction leak in the inlet tube leading into the
chemical pump. Inspect inlet tube and flow meter for air leaks
or 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 and plastic disk.
Defective cylinder in the solution 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.
86313050 LEGEND GT