cat 320 bs codice errore 4103

[maffy1963]

ciao a tutti :un dilemma che neanche il meccanico della concessionaria caterpillar non ne ha capito niente.
ho in officina un caterpillar 320bs il quale e' lento nei comandi e quando si scalda quasi muore.
chiamato la concessionaria caterpillar anno verificato l'impianto elettrico ed e'venuto fuori il codice di errrore 4103(Proportional reducing valve circuit is open.) anno verificato tutto ,ma non sono riusciti a trovare il problema:non sanno dove e quale sia questa valvola....
sotto le pompe ha un gruppo di elettrovalvole che sono state verificate sia come impedenza sia come continuita' di fili fino alla centralina,ma sembra tutto ok.
qualcuno di voi ha avuto qualche problema del genere?
avete qualche idea??
grazie

[albdesmo]

Ciao Maffy, il tuo è un 320 serie B? hai il pannello con 8 tasti(4 a destra e 4 a sinistra)?

[maffy1963]

ciao,si' e' proprio quello:
entrando in menu' errori dai tasti(0E0323A) e nel sottomenu'18top esce il codice errore 4103 e confrontando il catalogo cat dice proportional valve circuit is open

[sarda liebherr]

cat 320 bs codice errore 4103

ciao maffi, ho letto il problema che hai sul cat , ho letto che hanno controllato la continuità, ma la resistenza della bobina è stata controllata? Se hai un tester stacchi la spinetta di ogni elettrovalvola e con i puntalini del tester sui pin dell'attacco della spinetta dovresti trovarti sui 400 ohmm.Per come ho capito, si bloccano i servo comandi per il motivo che la porpozionale è in corto e questo puoi verificarlo misurando, come ti dicevo, la resistenza elettrica della bobina, una volta verificata puoi intercambiarla con quella successiva e vedi che il problema lo avrai su un altro comando; se riesco a reperire qualche dispensa cosi vai a colpo sicuro quella da smontare ciao buon lavoro

[maffy1963]

ciao a tutti,questo e'il bello:
la bobina e' nuova,originale,l'impedenza e'perfettamente nei parametri e i servocomandi funzionano perfettamente..sul display dice errore 4103 (circuito aperto-interrotto,ma e' ok fino in centralina),abbiamo provato anche a tirare dei cavi nuovi,per prova,ma e'la stessa cosaer quello il riparatore della cat non ne ha capito piu' nulla...
il problema e' che il scavatore va'lento e quando si scalda muore nei comandi

[D.G.MACHINERY]

Ciao Maffy, l'errore che hai è relativo alla valvola PRV, ossia alla "gestione" del carico motore attraverso l'idraulico, se non hai ancora risolto il problema controlla bene la continuità dei cavi, attenzione, puoi trovare una continuità della tensione ma uno dei cavi potrebbe essere a massa...

[maffy1963]

ciao,d.g. machinery:
dove si trova esattamente la valvolaPRV??

[maffy1963]

bungiorno a tutti:
ho fatto tutte le verifiche del caso e sono in alto mare:
i fili della valvola prv sono a posto(ho provato anche a tirare nuovi fili) ma niente.
se stacco un filo e do un comando muore il motore .se lo riattacco non muore;significa che e' ok.
ma l'escavatore non ha forza lo stesso:si muove a rallentatore in tutti i comandi.
non so' piu' che pesci pigliare....

[riccardo281063]

1) cambia meccanico CAT e vai da uno serio;
2) guarda se questo può esserti utile.

ciao


Remove & Install Proportional Reducing Valve
NOTE: The proportional reducing valve is located behind the right rear access door of the engine/main hydraulic pump compartment. The proportional reducing valve is mounted to the pilot manifold.
Fluid Spillage Containment
Care must be taken to ensure that the fluids are contained during performance of the inspection, the maintenance, the testing, the adjusting and the repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to the "Tools And Shop Products Guide, NENG2500" the tools and the supplies suitable to collect and contain any of the fluids in Caterpillar machines. Dispose of the fluids according to local regulations and mandates.


At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the hydraulic system before any of the hydraulic lines or any of the components are disconnected or removed.


1. Release the pressure in all of the implement hydraulic circuits (the boom, the stick and the bucket) before any of the hydraulic lines or any of the components are disconnected or removed, as follows:
a. Fully retract the stick cylinder rod.
b. Adjust the position of the bucket so that it will be flat on the ground when the boom is lowered.
c. Lower the boom until the bucket is flat on the ground.
d. Shut off the engine and place key in the "ON" position. Put the hydraulic activation control lever in the "UNLOCK" position.
e. Move the control levers for the boom, the stick and the swing to all full stroke positions. This will release any pressure that might be present in the pilot system.
f. Return the key to "OFF" position.
g. Slowly loosen the fill plug on the hydraulic tank and release the pressure.
h. Tighten the fill plug on the hydraulic tank. Tighten the fill plug to a torque of 68 ± 7 N*m (50 ± 5 lb ft).
i. The pressure in the hydraulic system has been released and the hydraulic lines and the components can be removed.
View Image 1


2. Oil will drain from the pilot manifold when the proportional reducing valve is removed. Place a drain pan under the pilot manifold to contain the drain oil.
3. Disconnect wiring harness (2) from proportional reducing valve (1). Remove two bolts (3) and proportional reducing valve (1) from the pilot manifold.
View Image 2

4. Remove four O-ring seals (4) from the proportional reducing valve.
NOTE: The following steps are for the installation of the proportional reducing valve.
5. Check the condition of four O-ring seals (4). If the O-ring seals are damaged, use new parts for replacement.
6. Install proportional reducing valve (1) in the reverse order of the removal steps.
7. Tighten two bolts (3) to a torque of 4 ± .4 N*m (3 ± .3 lb ft).
NOTE: Refer to the topic "Lubricant Viscosities and Refill Capacities" in the "Operation & Maintenance Manual" for the proper filling procedure and the proper levels for the hydraulic oil system.
8. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank with oil to the correct level.

[riccardo281063]

Proportional Reducing Valve Sweep - Test
This function is used to check that the proportional reducing valve is activating with a current signal from the controller.


Procedure
Table 1 Tools Needed
9u-7401 Multitach
9u-7506 Magnetic Adapter Cable
6v-7070 Digital Multimeter (Heavy Duty)
132-7842 Adapter Cable (Breakout)
4c-4892 ORFS Fittings Group



Stop the engine. Disconnect the proportional reducing valve solenoid from the machine harness. Connect one connector of the test harness to the machine harness at connection point of the proportional reducing valve. Connect the other connector of the test harness to the connector of the proportional reducing valve solenoid.

Install a 4900 kPa (710 psi) pressure gauge at the power shift test port of the main pump. In order to find the location of the pressure tap, see the Testing And Adjusting section in the module for the Hydraulic System of the machine.

Place the pump backup switch in the AUT position.

Set the engine speed dial at the 10 position.

The hydraulic oil should be warmed to a temperature of approximately 50 °C (122 °F).

Place all control levers to the NEUTRAL position.

Activate the service mode and select the sweep test signal for the power shift pressure.

Enter service code 60. The character display shows "oF". This display indicates that the sweep test signal for the power shift pressure is not valid.

The fine control mode switch (25) is pressed in order to shift the blinking positions to the right two character.

Press the travel alarm cancel switch (22). "on" should be displayed in the two right character positions. This display indicates that sweep test signal of power shift pressure is valid.

Press the travel alarm cancel switch (22) again. "oF"should be displayed. This display indicates that the sweep test signal of power shift pressure has stopped.

Perform the following measurement at the test harness. During the sweep test, the reading of the multimeter should be within a range from 0.2 to 0.75A in approximately 20 seconds. The simultaneous reading of the pressure gauge should be from 490 kPa (71 psi) to 3450 kPa (500 psi).

Make sure that the multimeter and the readings of the pressure gauge cycle at a uniform rate of increase or decrease (no spike or quick changes).
Note: In order for this function to operate properly, the engine must be running and the engine speed dial should be in the position of 10. The temperature of the hydraulic oil must be approximately 50 °C (122 °F).

Perform the following instruction in order to enter the service code "60". The user mode switch is pressed in order to move the flashing character to the left position. The boom priority mode switch is pressed in order to change the first number to a flashing "6". The second number will be a "0". The two characters on the right side will show "oF". This display indicates that the sweep test signal for the power shift pressure is not activated. The fine control mode switch is pressed in order to move the flashing character to the right side of the display. The alarm cancel switch should be pushed and the display will show "on" in the two right positions.