Localización y Solución de Problemas G3520B Engines Número de medio -RENR5927-05 Fecha de publicación -01/05/2006 Fecha de actualización -25/05/2006 i01882835 Electrohydraulic System Oil Pressure (Low) SMCS - 1300-035 Probable Causes • The elec trohyd rauli c syst em's oi l level is low. • The electr ical circ uit for the elect rohydr aulic oil pre ssure switch is open. • There is an open circuit in the wiring harness between the electrohydraulic oil pressure switch and the master Electronic Control Module (ECM). • The oil press ure for the elect rohydr aulic sys tem is insuf ficien t. Recommended Repairs Check the Electrohydraulic System's Oil Level Observe the electrohydraulic system's oil level in the sight g auge on the tank. If necessary, pour oil into the tank until the oil level is between the "ADD" and "FULL" marks on the sight gauge. Check for oil leaks. Open Circuit for the Electrohydraulic Oil Pressure Switch The electrohydraulic oil pressure switch must remain closed while the engine is running. If the switch opens for more than 1 second, an "E266 (3)" event code is generated and the engine is shut down. The switch opens at 700 ± 103 kPa (102 ± 15 psi). The switch closes at 1206 kPa (175 psi). Check for proper operation of the switch. Apply a known pressure to the electrohydraulic system. While you apply the pressure, use a ohmmeter to observe the status of the contact for the switch between terminals A and B. If the switch does n ot function properly, replace the switch. Open Circuit in the Wiring Harness Use the following procedure to check the harness. Do not operate the engine during this procedure. 1. Set th e engin e contr ol to the STOP mod e. 2. Use the Caterpillar Electronic Technician (ET) to observe the "Hydrax Pressure Switch Status". The status of the switch should be "Open". Página 1 de 2 Service Information System 21/02/2014

Electrohydraulic System Oil Pressure (Low)

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3. Disconnect the 3-pin connector at the electrohydraulic oil pressure switch.

4. Attach a jumper wire between terminals A and B on the harness connector.

5. Use Cat ET to observe the "Hydrax Pressure Switch Status".

The status of the switch should be "Closed".

6. Continue to observe the "Hydrax Pressure Switch Status". Wiggle the wiring from the harness

connector to the master ECM P2 connector.

The status of the switch should still be "Closed".

If the "Hydrax Pressure Switch Status" momentarily changes to "Open", the harness has anintermittent circuit.

If there is an intermittent circuit, locate the problem. Make repairs to the harness, when possible. After the

harness is repaired, remove the jumper wire from the 3-pin connector. Reconnect the connector.

If the harness cannot be repaired, replace the harness.

Check the Oil Pressure of the Electrohydraulic System

The electrohydraulic oil pressure switch is designed to close at 1206 kPa (175 psi). The switch is designed

to open at 700 ± 103 kPa (102 ± 15 psi). The switch must remain closed during engine operation. Use agauge to check the oil pressure of the electrohydraulic system at the outlet for the hydraulic pump while the

engine is cranking or running. Check the pressure while the engine is at normal operating temperature,

when possible.

If the pressure is less than 1206 kPa (175 psi), inspect the electrohydraulic system for leaks. Inspect thehydraulic pump. Make repairs, as needed.

Fri Feb 21 2014 15:46:54 GMT-0400 (Hora estándar oeste, Sudamérica)

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