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WARNING
Relieve pressure before repair, page 5.
DISPLAY*
SPRAYER OPERATION
No Display
Sprayer may be pressurized
Sprayer may be pressurized
Sprayer is pressurized. Power is applied.
(Pressure varies with tip size and
pressure control setting.)
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
Sprayer stops. Engine is running.
* Error codes also appear on control board as a blinking red
LED. LED is an alternate to digital messages.
1.
Remove two screws (71) and swing down cover (130).
2.
Start engine. Blink count is the same as error code(E=0X).
310893J
Digital Display Messages
•
•
INDICATION
Loss of power or display not
connected
Pressure less than
200 psi (14 bar, 1.4 MPa)
Normal operation
Exceeded pressure limit
Pressure transducer faulty, bad
connection or broken wire
High clutch current
Loss of paint to pump or severe
pressure loss
Pressure greater than
2000 psi (138 bar, 14 MPa) while in
Flush Timer Mode
After a fault, follow these steps to restart sprayer:
1.
2.
3.
Digital messages are not available on all sprayers
Blinking LED total count equals digital error code
i.e., two blinks is the same as E=02
Check power source. Relieve pressure
before repair or disassembly. Verify
display is connected.
Increase pressure as needed
Spray
1.
Check fluid path for clogs, such as
clogged filter
2.
Open prime valve and gun if running
AutoClean
3.
Use Graco paint hose, 1/4 in. x 50 ft
minimum. Smaller hose or metal
braid hose may result in pressure
spikes.
4.
Replace transducer if fluid path is not
clogged and proper hose is used.
1.
Check transducer connection
2.
Disconnect and reconnect
transducer plug to ensure good
connection with control board socket
3.
Open prime valve. Replace sprayer
transducer with known good
transducer and run sprayer. Replace
transducer if sprayer runs or control
board if sprayer does not run.
1.
Check wiring connections.
2.
Measure: 1.2 +0.2Ω (GMax II 3900);
1.7 +0.2Ω (GMax II 5900/ 7900)
across clutch field at 70°F
3.
Replace clutch field assembly
1.
Check for empty paint condition, clogged
inlet strainer, failed pump or severe leak
2.
Reduce pressure and turn pump
switch OFF and ON to restart pump
3.
WatchDog function can be deactivated
by turning WatchDog switch OFF
1.
Open prime valve and gun
2.
Verify no flow obstructions or
clogged filter
Correct fault condition
Turn sprayer OFF
Turn sprayer ON
Pressure Control
ACTION
15
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