HP GMAX 5900 - Manual (Page 14)

Pressure Control
14 311046H
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)
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. Watch dog 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
(with constant
green LED)
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