Series 60 DDEC V Troubleshooting – Section 2.10 Defective Pressure Relief Valve

Section 2.10
Defective Pressure Relief Valve

To determine if a defective pressure relief valve is causing low oil pressure, perform the following steps: ‪

1. Remove the pressure relief valve; refer to appropriate service manual, lubrication system chapter.
2. Inspect the oil pressure relief valve; refer to appropriate service manual, lubrication system chapter.
   1. If the relief valve moves freely in the valve body, reinstall the oil pressure relief valve; refer to appropriate service manual, lubrication system chapter. Check the pickup tube and screen assembly for defects, refer to "2.11 Defective Pickup Screen Tube and Screen Assembly" .
   2. If the relief valve will not move freely in the valve body, refer to "2.10.1 Pressure Relief Valve Repair" .

Section 2.10.1
Pressure Relief Valve Repair

Perform the following steps to repair the pressure relief valve:‪

1. Disassemble the pressure relief valve and replace damaged components; refer to appropriate service manual, lubrication system chapter.
2. Assemble and install the pressure regulator valve; refer to appropriate service manual, lubrication system chapter.
3. Verify repair of the regulator valve; refer to "2.10.1.1 Test Engine with Repaired Relief Valve" .

Section 2.10.1.1
Test Engine with Repaired Relief Valve

Perform the following steps to determine if repaired relief valve resolved low oil pressure:‪

1. Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure "Typical Display Data Line Adaptor" ; refer to OEM guidelines.
2. Start and run engine speed at 1800 rpm.
3. Visually examine the DDR for oil pressure reading.
   1. If the DDR indicates 241 kPa (35 psi), or more at 1800 rpm, shut down the engine and disconnect the DDR. No further troubleshooting is required.
   2. If the DDR indicates less than 241 kPa (35 psi), at 1800 rpm, shut down the engine and disconnect the DDR, check pickup tube and screen assembly; refer to "2.11 Defective Pickup Screen Tube and Screen Assembly" .