John Deere 000737.05 – EPC: Gear Selector Clutch K2 Solenoid Amps Low Main Control Module

The Electronic PowrQuad Controller (EPC) has detected a 'current too low' or 'open circuit' condition in the electrical circuit for the Gear Selector Clutch K2 Solenoid (also identified as Y39). This indicates a break in the electrical path or insufficient amperage draw, which prevents the solenoid from actuating properly and may affect the proper operation of the gear selection system.

• 6020
• 6120
• 6220
• 6320
• 6420
• 6420S

1. 1

   Visually inspect the wiring harness leading to the transmission and the K2 solenoid (Y39) for chafing, cuts, or corrosion.

2. 2

   Ensure all electrical connectors are clean, dry, and securely seated.

3. 3

   With the ignition on, check for 12 volts at the power supply wire of the K2 solenoid connector to rule out upstream wiring or fuse issues.

4. 4

   Disconnect the wiring harness from the K2 solenoid and check for continuity on the harness from the EPC to the solenoid connector to rule out a broken wire.

5. 5

   Perform a solenoid resistance test by measuring across its two terminals with a multimeter (typical range is 5 to 30 ohms). A reading of 'OL' indicates an internal open circuit and a faulty solenoid.

6. 6

   Perform a solenoid activation test by briefly applying 12 volts directly to the solenoid's terminals. The absence of a distinct 'click' suggests the solenoid is mechanically stuck or internally failed.

1. 1

   Prepare machine for service

   Ensure the tractor is on a level surface, the parking brake is engaged, and the engine is off. Disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate the solenoid

   Locate the K2 (Y39) solenoid on the transmission's control valve block. Remove any necessary covers or components to gain access.

3. 3

   Drain transmission fluid

   If necessary, based on the solenoid's location on the valve body, drain the transmission fluid to avoid spillage during removal.

4. 4

   Remove the faulty solenoid

   Disconnect the electrical connector from the solenoid and carefully unscrew it from the valve body. Be prepared for residual fluid to leak out.

5. 5

   Install the new solenoid

   Ensure the new solenoid matches the old one. Lubricate the O-rings on the new solenoid with clean hydraulic fluid. Screw the new solenoid into the valve body, tighten to the manufacturer's specified torque, and securely reconnect the electrical wiring harness.

6. 6

   Reassemble and refill

   Reinstall any covers or components that were removed. If transmission fluid was drained, refill it to the correct level with the appropriate John Deere hydraulic fluid. Reconnect the negative battery cable.

7. 7

   Verify the repair

   Start the tractor and check for any leaks. Operate the transmission to ensure proper shifting. Clear the fault codes from the EPC controller and verify that the 000737.05 code does not return.