Troubleshooting
3A6748B 41
Low or Fluctuating Output
Problem Cause Solution
Low Output Worn spray tip. Follow Pressure Relief Procedure
Warning, then replace tip. See your
separate gun or tip manual.
Verify pump does not continue to
stroke when applicator is turned off.
Service pump. Check piston and
intake valves for wear or
obstructions.
Filter clogged (If optional filter is
installed).
Relieve pressure. Check and clean
filter.
Material hose length. Longer hose
length reduces sprayer
performance.
Replace with hose length less than
specified maximum.
Pump hopper adapter connections. Tighten any loose connections.
Replace pump hopper adapter if
cracked or punctured.
Electrical supply with volt meter.
Meter must read:
210-255 Vac for 220-240 Vac
models;
85-130 Vac for 100-120 Vac
models. Low voltages reduce
sprayer performance.
Reset building circuit breaker;
replace building fuse. Repair
electrical outlet or try another outlet.
Extension cord size and length;
must be at least 2.05 mm
2
(12 awg)
wire and no longer than 90 m (295
ft). Longer cord lengths reduce
sprayer performance.
Replace with a correct, grounded
extension cord.
Leads from motor to pressure
control circuit board for damaged or
loose wires or connectors. Inspect
wiring insulation and terminals for
signs of overheating.
Be sure male terminal blades are
centered and firmly connected to
female terminals. Replace any
loose terminal or damaged wiring.
Securely reconnect terminals.
Low stall pressure. Turn pressure control knob fully
clockwise. Make sure pressure
control knob is properly installed to
allow full clockwise position. Try a
new transducer. Check pump
control mode. If used in middle
position, the pump is limited to 600
psi.
Fluctuating Output Material supply. Refill hopper and reprime pump.
Loose fittings. Tighten; use thread sealant or
sealing tape on threads if
necessary.
Intake valve ball and piston ball are
not seating properly.
Remove intake and piston valves
and clean. Check balls and seats for
nicks or obstructions; replace if
necessary, page 58. Clean hopper
before using to remove particles
that could clog pump. Switch to a
rubber inlet ball (6912).
Leaking around throat packing nut
which may indicate worn or
damaged packings.
Replace packing, page 58. Also
check piston valve seat for
hardened paint or nicks and replace
if necessary.
Pump rod damage. Repair pump.
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