Prochem Legend XL - Manual (Page 37)

MAINTENANCE
86037400 02/16/07
4-12
PROBLEM CAUSE SOLUTION
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 gasket. Repair seal or replace
Re-position lid(s).
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.
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
Vacuum exhaust heat exchangers
are plugged with lint.
Remove and clean.
Loss of vacuum
While cleaning, the vacuum is
not up to specification. Engine
RPM is normal.
Vacuum pump is worn out. Replace the vacuum pump.
Improper throttle adjustment.
Adjust throttle to set desired vacuum
perssure.
Vacuum obstruction Inspect hoses for obstructions. Excessive Vacuum
Vacuum relief valve requires
adjustment.
Readjust the vacuum relief valve.
Chemical pump is improperly
primed. Refer to chemical pump priming
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 air
leaksor 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 the 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.