Hitachi GMAX II 3900 - Manual (Page 15)

Pressure Control
310893L 15
Digital Display Messages
* 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).
After a fault, follow these steps to restart sprayer:
1.
Correct fault condition
2. Turn sprayer OFF
3. Turn sprayer ON
WARNING
Relieve pressure before repair, page 5.
DISPLAY* SPRAYER OPERATION INDICATION ACTION
No Display Sprayer may be pressurized Loss of power or display not
connected Check power source. Relieve pressure before
repair or disassembly. Verify display is
connected.
Sprayer may be pressurized Pressure less than
200 psi (14 bar, 1.4 MPa) Increase pressure as needed
Sprayer is pressurized. Power is
applied. (Pressure varies with tip
size and pressure control setting.) Normal operation Spray
Sprayer stops. Engine is running. Exceeded pressure limit 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.
Sprayer stops. Engine is running. Pressure transducer faulty,
bad connection or broken
wire 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.
Sprayer stops. Engine is running. High clutch current 1. Check wiring connections.
2. Measure: 1.2 +0.2 Ω (GMAX II 3900);
1.7 +0.2
Ω (GMAX II 5900/ 7900 &
TexSpray 7900HD)
across clutch field at 70°F
3. Replace clutch field assembly
Sprayer stops. Engine is running. Loss of paint to pump or
severe pressure loss 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
Sprayer stops. Engine is running. Pressure greater than
2000 psi (138 bar, 14 MPa)
while in Flush Timer Mode 1. Open prime valve and gun
2. Verify no flow obstructions or clogged filter
ti6314a
psi
bar
MPa
ti6315a
ti6316a
ti6317a
ti6318a
ti6320a
• 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
(with constant
green LED)