SECTION FOUR
–
SERVICE AND MAINTENANCE
P a g e
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108268/49-053 Rev M LEGEND BRANDS MODEL APEX 570
PRESSURE PUMP DOES NOT ENGAGE
PROBABLE CAUSE
SOLUTION
Pressure pump circuit breaker has been
tripped.
Check the pressure pump circuit breaker on the control panel.
Press the circuit breaker reset button.
Defective electrical connection in the console
wiring or defective switch.
Examine switch, electrical connections, and wiring. Repair any
defective connections. If there is power going to the switch
but not going out, replace the defective switch.
Pressure pump has not been activated.
Turn pressure pump switch to on.
Defective pressure pump clutch.
If there is power in the switch, but not power at the clutch,
replace the defective wire. If there is power at the clutch,
replace the defective switch.
Loose or broken pressure pump belts.
Tighten or replace belts.
CHEMICAL SYSTEM TROUBLESHOOTING
CHEMICAL FLOW METER INDICATES FLOW WITH TOOL VALVE CLOSED
PROBABLE CAUSE
SOLUTION
External leak in chemical piping.
Tighten or replace fittings. Re-apply thread sealant where
required.
Outlet check valve is full of debris or damaged,
not allowing it to close properly.
Close the chemical valve on the instrument panel. If the flow
meter does not indicate flow, remove debris or replace check
valve, if necessary.
Chemical pump diaphragm is ruptured.
Close the chemical valve on the instrument panel. If the flow
meter still indicates flow, replace the chemical pump
diaphragm.
Internal leak in chemical valve causing
continual flow through prime tube returning to
container.
Tighten valve packing nut (see “General Service Adjustments).
Replace valve, if necessary.
LOSS OF CHEMICAL (CLEANING TOOL OPEN, NO CHEMICAL)
PROBABLE CAUSE
SOLUTION
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 leaks or damage.
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.
Defective cylinder in the pressure pump.
Measure the pump volume. If the pump volume is less than
normal, refer to “Loss of
Solution
Volume” in
this section.
Summary of Contents for APEX 570
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