8.4
Display unit
NOTE
Fig. 8-2 Display unit
When the ignition is turned on, a lamp test will run on the display unit for a couple of seconds. During this test, all the lamps will light up and every digit in the operating hours counter will be shown as an 8.
Use this test to check whether the display unit is working correctly. If it is not, it will have to be replaced.
Tab. 8-3 Fault description, machine won’t move
Fault description
Display unit is dead.
No lamps and displays when ignition is switched on.
Possible cause
Fuse
F13
Display unit
N2
Relay
K1
Operating hours counter
P3 is not working and battery charging lamp
H1 does not turn off when the engine is running
Control lamp H1 does not light when the ignition is switched on.
Alternator
Alternator
G1
Display unit
N2
G1
Cable, connector, display unit
N2
Checks
Is F13 OK?
When the ignition is on, pin 1 must have a voltage of
+12 V and pin 8 must have the chassis ground voltage level.
The relay must be switched as soon as the ignition is switched on.
Is the connector connected?
When the ignition is on, pin 7 must have a voltage of
0 V = chassis ground. When the engine is running, on the other hand, it must have +12 V.
If the battery charges anyway (voltage approx. 14 V), the problem is probably with
N2.
Hold cable 133 against ground. The lamp must be lit.
Error warning indicator
H6 lights up.
Controller
N1
Fuse
F22
Alternator
G1
Engine oil pressure switch
S21
●
●
●
The tilt sensor measured a tilt angle greater than
45° (the diesel engine is turned off when this happens).
If shutdown bar
H5 is flashing at the same time: It will not be possible to start the engine until oil pressure switch
S21 is closed (H3 is lit up) and D+ for G1 has a voltage of 0 V (H1 is lit up).
The controller detected a fault.
If the machine is not inclined and controller
N1 is properly mounted, there is a fault in the controller’s switching outputs -> The controller does not work
Display unit
Troubleshooting 103
Fault description
Oil pressure warning lamp
H3
lights up while the engine is running.
Possible cause
Engine oil pressure switch
S21
Oil pressure warning lamp
H3
does not light when the ignition is switched on.
Engine oil pressure switch
S21
Cable, connector, display unit
N2
Checks
Is the connector connected? Short-circuit to ground?
Engine oil level OK? Engine oil pressure OK?
When the engine is stopped, the connection must have contact to chassis earth. The switch must be open when the engine is running.
The diesel engine turns off after 4 s.
Pull the connector off of the switch and ground it. The lamp must be lit.
Solid connector connection? No corrosion?
Water temperature warning indicator lights up. Engine running.
H4
Water temperature warning lamp
H4 does not light when the ignition is switched on.
Lamp test.
Coolant temperature switch
S22
Cable, connector, display unit
N2
Shutdown bar warning lamp H5 lights up even though the shutdown bar is not being actuated / a shutdown bar is not installed
Pre-heating control lamp up.
H2 never lights
Control lamp is lit continuously
Cooling water temperature switch
Relay
S22
Proximity switch
Controller
N1
Ignition switch
Controller
K6
N1
S1
S24
Is the connector connected? Short-circuit to ground?
The switch must be open when the operating temperature is normal.
The diesel engine turns off after 4 s.
Defective? Solid connector connection? No corrosion?
Pull the connector off of the coolant temperature switch and ground it. The lamp must be lit.
The switch must be open when the operating temperature is normal.
The diesel engine turns off after 4 s.
The lamp lights up with a solid light:
If the machine features a shutdown bar, check to make sure that the magnet on the shutdown bar is positioned correctly. The switch must be closed when the shutdown bar is not being actuated.
Otherwise, check the jumper that is plugged in instead of
S24.
The lamp flashes:
The infrared transmitter is located less than 3 m from the machine.
The lamp flashes like a camera flash:
The infrared transmitter is located between 3 m and 4 m from the machine.
Not a fault! Prerequisite for cable operation of the remote control.
The lamp must light up when ignition switch S1 is in the pre-heating position.
The lamp must light up when the switch is held at the
Start position on the handheld controller.
F24 OK? Ignition switch OK?
Relay OK?
104 Rammax 1575
