Prochem LEGEND GT, Operating Instructions Manual

Page: 48 / 137

46
Maintenance
Troubleshooting
PROBLEM CAUSE SOLUTION
Loss of solution pump
pressure.
With the cleaning tool
open, the solution
pressure gauge reads
below the normal
operating pressure.
Water supply is turned off or the float
valve is stuck or improperly adjusted.
Turn the water supply on or up. Check for
kinks in the water supply hose. Examine the
float valve and adjust or replace.
Solution pump inlet supply line is
plugged or drawing air.
Examine the water inlet strainer 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).
Improper engine speed
Using a tachometer, check the engine speed.
Full throttle engine speed is 3200 RPM. Idle
engine speed is 1400 RPM. Refer to the
“engine speed” section for instructions on how
to re-adjust.
Pressure regulator o-ring is dry.
Lubricate o-ring, using o-ring lubricant Part
#86265430.
Pressure regulator has worn o-ring Check o-ring. If necessary, replace.
Pressure regulator is dirty, stuck open,
or improperly adjusted.
Clean or repair regulator. Adjust to working
pressure. Lubricate o-ring, using o-ring
lubricant Part #86265430.
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).
Examine the check valves, plunger cups, and
cylinder head on the solution pump. Repair,
whenever required (refer to the solution pump
service manual).
Defective solution pressure gauge. Replace gauge
Orifice (spray nozzle) in the cleaning
tool is worn, defective, or wrong size.
Replace Nozzle or change nozzle size.
Debris clogging water lines or water
inlet disconnect.
Clean or replace as needed.
Belt loose or broken Re-tension or replace as needed.
Loss of pump prime Manually prime solution pump.
Temperature Balance Orifice missing Replace Orifice.
Loss of solution volume
at cleaning tool orifice.
Solution gauge reads
normal.
Plugged orifice and/or screen in the
cleaning tool.
Unplug or replace orifice and/or screen
Internal block between the pressure
regulator manifold and the solution
manifold, or the solution screen is
clogged
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.
Outlet check valve is plugged Examine the check valve, remove any debris
Defective quick-connect on one or more
of the high pressure hoses. Replace defective quick-connects(s) on high
pressure hoses(s).
Cleaning tool valve is malfunctioning. Repair or replace valve.
Hose inner lining is constricted. Remove restriction or replace hose.
Air leak in chemical supply line, priming
valve or metering valve.
Check for air leaks. Replace faulty parts.
86313050 LEGEND GT