Case IH 8008 – Front PTO Controller: Front PTO solenoid open circuit

The Front PTO solenoid has an open circuit, is shorted to ground, or the AD12VU2 voltage supply is low.

• Puma/Mid Range Magnum
• Maxxum
• Farmall
• Case IH Puma Series (140, 165, 180, 195, 210, 225 CVX)
• Case IH Maxxum Series (100, 110, 115, 120, 125, 130, 140, 5120, 5130, 5140, 5150, and MX series MX100-MX170)
• Case IH Magnum Series (235-340 Series 4)
• Case IH Steiger Series

1. 1

   Check the 12V supply (AD12VU2) to the Front PTO system and inspect the fuse box for any blown fuses

2. 2

   Inspect the wiring harness leading to the Front PTO solenoid for chafing, breaks, or corrosion, looking specifically for an open wire or a short to ground

3. 3

   Check physical connections at the solenoid (connectors X024, X026, X227, X817, or X393) to ensure pins are not pushed back or corroded

4. 4

   Test the specific Front PTO circuits (wire 2043 for PTO Solenoid Front and wire 2044 for Return) for continuity using a multimeter

5. 5

   Unplug the solenoid and measure the resistance across the solenoid coil pins; an infinite resistance (OL) indicates a broken internal coil

1. 1

   Power Down

   Turn off the tractor and remove the key.

2. 2

   Locate the Solenoid

   Locate the Front PTO solenoid valve, typically mounted on the front hydraulic block/cylinder assembly near the front hitch.

3. 3

   Verify Power/Ground

   Turn the key to the ON position (engine off). Using a multimeter, verify that the controller is sending the proper voltage to the connector when the PTO switch is engaged.

4. 4

   Repair Wiring

   If the voltage is missing or the ground is faulty, trace the harness back to the controller and repair the open or shorted wire. Replace any blown fuses.

5. 5

   Replace Solenoid

   If the wiring and voltage are good but the solenoid coil tests open, the solenoid must be replaced. Disconnect the electrical connector, clean the area around the valve, unthread the old solenoid valve cartridge from the manifold, install the new solenoid valve, torque to OEM specifications, and reconnect the wiring harness.

6. 6

   Clear Codes

   Clear the fault codes using a diagnostic tool and test the Front PTO engagement to ensure the code does not return.