Prochem LEGEND GT Operating Instructions Manual page 36

MAINTENANCE
PROBLEM
Loss of solution pump
pressure.
With the cleaning tool open,
the solution pressure gauge
reads below the normal
operating pressure.
Loss of solution volume at
cleaning tool orifice.
Solution pressure gauge
reads normal.
4-11
CAUSE
Water supply is turned off or the float
valve is stuck or improperly adjusted.
Solution pump inlet supply line is
plugged or drawing air.
Improper engine speed
Pressure regulator o-rings are dry.
Pressure regulator has worn o-rings
Pressure regulator is dirty, stuck open,
or improperly adjusted.
Low pump volume. (Measure the
amount of water being returned to the
water box from the pressure regulator.
It should fill a gallon container about
every 17 seconds).
Defective water pressure gauge.
Orifice (spray nozzle) in the cleaning
tool is worn, defective, or wrong size.
Debris clogging water lines or water
inlet disconnect.
Belts loose or broken
Loss of pump prime
Temperature Balance Orifice missing
Plugged orifice and/or screen in the
cleaning tool.
Internal block between the pressure
regulator manifold and the outlet
manifold, or the solution screen is
clogged
Outlet check valve is plugged
Defective quick-connect on one or more
of the high pressure hoses.
Cleaning tool valve is malfunctioning.
Hose inner lining is constricted.
Air leak in chemical supply line, priming
valve or metering valve.
86313050 LEGEND GT 09/12/08
SOLUTION
Turn the water supply on or up. Check for
kinks in the water supply hose. Examine the
float valve and adjust or replace.
Examine the water inlet filter inside the water
box. Remove accumulated debris and
replace if required. Check for suction leaks
and loose clamps or fittings. Tighten any
loose fittings or clamps. Replace any
ruptured hose(s).
Using a tachometer, check the engine speed.
Full throttle engine speed is 2950 RPM. Idle
engine speed is 1400 RPM. Refer to the
"engine speed" section for instructions on
how to re-adjust.
Lubricate o-rings, using o-ring lubricant Part
#86265430, PRV NO. 05-008035.
Check o-rings. If necessary, replace.
Clean or repair regulator. Adjust to working
pressure. Lubricate o-rings, using o-ring
lubricant Part #86265430, PRV NO.
05-008035.
Examine the check valves, plunger cups, and
cylinder head on the water pump. Repair,
whenever required (refer to the water pump
service manual).
Replace gauge
Replace Nozzle or change nozzle size.
Clean or replace as needed.
Re-tension or replace as needed.
Manually prime water pump.
Replace Orifice
Unplug or replace orifice and/or screen
Inspect all lines, remove accumulated debris
which is blocking proper flow. Replace any
defective hoses. Remove, inspect, and clean
the solution screen. De-scale unit and install
a water softener, if necessary.
Examine the check valve, remove any debris
Replace defective quick-connects(s) on high
pressure hoses(s).
Repair or replace valve.
Remove restriction or replace hose.
Check for air leaks. Replace faulty parts.