Troubleshooting
20 3A1570V
Electronics
Fluid pressures not balanced between A
and B side
Fluid viscosities not equal Adjust A and B temperature settings to
balance viscosity. Sometimes normal if
pressure offset is below 200 psi (14 bar)
Preheat material in drums by
recirculating; see Operation manual
Inlet Y-strainer screen plugged on low
pressure side
Clean inlet filter screen
Gun port or filter plugged on high
pressure side
Clean or replace; see gun manual
Pump inlet ball not seating or sticking Clean seating; see pump manual
Drum fluid outlet supply hose too small Use 3/4 in. (1.9 cm) ID hose with short
length
Low side feed pump not working Turn on or repair feed pump
Pressure Relief/Spray valve leaking back
to supply
Pump does not reverse direction Obstruction of air motor or pumps Check and clear obstruction
Unequal fluid pressure between
UP/DOWN stroke
Feed pumps boost pressure on up stroke. Reduce feed pump pressures
Air motor doesn’t move with air pressure
applied
Damaged air valve Replace or service air valve. See Air
Motor manual.
Damaged pilot valve Replace valve. See Air Motor manual.
Park valve left open or leaking
Pump movement speed is erratic Worn air motor seals Replace seals. See Air Motor manual.
Worn pump seals Replace seals; see Pump manual.
PROBLEM CAUSE SOLUTION
PROBLEM CAUSE SOLUTION
Display does not illuminate. No power. Plug in power cord.
Turn disconnect ON .
Low voltage. Ensure input voltage is within
specifications. See Temperature
Display, page 39.
Loose wire. Check connections. See Temperature
Display, page 39.
Display disconnected. Check cable connections. See
Temperature Display, page 39.
Temperature display does not
illuminate.
Display disconnected. Check cable connections. See
Temperature Display, page 39.
Display cable damaged or corroded. Clean connections; replace cable if is
damaged.
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