SECTION FOUR
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SERVICE AND MAINTENANCE
P a g e
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108268/49-053 Rev M LEGEND BRANDS MODEL APEX 570
PRESSURE PUMP TROUBLESHOOTING
LOSS OF SOLUTION PRESSURE (CLEANING TOOL OPEN, SOLUTION GAUGE READS LOW)
PROBABLE CAUSE
SOLUTION
Water supply is turned off or the float valve is
stuck.
Turn the water supply on or up. Check for kinks in the water
supply hose. Examine the float or replace.
Solution pump inlet supply line is plugged or
drawing air.
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).
Improper engine speed.
Using a tachometer, check the engine speed. Full throttle
engine speed is 3000 RPM. Idle engine speed is 1500 RPM.
Pressure regulator o-rings are dry and/or worn.
See instructions on regulator.
Check o-rings. Lubricate and/or replace as needed, using o-
ring lubricant.
Pressure regulator is dirty, stuck open, or
improperly adjusted. See instructions on
regulator.
Clean or repair regulator. Adjust to working pressure.
Lubricate o-rings, using o-ring lubricant.
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 17.6 seconds).
Examine the check valves, plunger cups, and cylinder head on
the water pump. Repair, whenever required (refer to the
water pump service manual).
Defective water 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.
Belts loose or broken.
Re-tension or replace as needed.
Loss of pump prime.
Manually prime water pump.
Temperature Balance Orifice missing.
Replace Orifice.
LOSS OF SOLUTION VOLUME AT TOOL (PRESSURE GAUGE READS NORMAL)
PROBABLE CAUSE
SOLUTION
Plugged orifice and/or screen in the cleaning
tool.
Unplug or replace orifice and/or screen.
Internal block between the inlet pressure
regulator and the solution outlet manifold, or
the solution screen is clogged.
Inspect all lines, remove accumulated debris which is blocking
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.
Summary of Contents for APEX 570
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