Case IH 5007 – Transmission Control Unit (TCU) or Armrest / Cab Controller (ATC): Rear PTO Solenoid - Stuck off

The controller is commanding the rear Power Take-Off (PTO) to engage, but the solenoid is failing to actuate. This is typically caused by a circuit shorted to ground, an open circuit, a failed solenoid coil, an internal control module failure, or a stuck PTO remote fender switch.

• Puma/Mid Range Magnum
• Maxxum
• Case IH Magnum Series
• Case IH Puma Series
• Case IH Maxxum Series
• Case IH Steiger Series

1. 1

   Verify that the rear fender PTO switches (if equipped) are not physically stuck or packed with debris, which can trigger a logic error.

2. 2

   Disconnect the main harness connector leading to the PTO solenoid and measure the resistance across the circuit pins to test the solenoid circuit.

3. 3

   Disconnect the electrical connector directly at the PTO solenoid and measure the resistance of the solenoid coil. A healthy coil should measure between 6.0 and 6.8 ohms at 25°C (77°F - 100°F).

4. 4

   Test for continuity between the solenoid power wire and the tractor chassis (ground) to check for shorts. If continuity exists, trace the wiring harness for rubbed or melted insulation.

1. 1

   Preparation

   Park the tractor on a level surface, apply the hand brake (or engage ParkLock), and turn off the engine.

2. 2

   Locate the Solenoid

   The Rear PTO Solenoid is typically located on the top side or the rear left-hand top of the transmission housing.

3. 3

   Clean the Area

   Thoroughly clean the area around the solenoid valve to prevent dirt and debris from falling into the transmission/hydraulic system.

4. 4

   Disconnect Wiring

   Unplug the 2-pin electrical connector from the PTO solenoid.

5. 5

   Remove the Solenoid

   Remove the retaining nut or bolts holding the solenoid valve cartridge in the transmission housing. Carefully pull the solenoid cartridge out.

6. 6

   Install the New Solenoid

   Lubricate the O-rings on the new solenoid with clean hydraulic/transmission oil. Insert it into the housing and torque the retaining fastener to OEM specifications.

7. 7

   Reconnect

   Plug the 2-pin electrical connector back in.

8. 8

   Calibration

   On many Case IH models (like the Puma and Magnum), replacing the PTO solenoid valve requires you to perform a PTO Calibration procedure via the cab monitor or H-Menu to ensure proper clutch engagement pressures.