Massey Ferguson A.40.1E – EHR (Electronic Hydraulic Control) unit or main vehicle ECU: External Hydraulic Valve 4 Issue

This code indicates a malfunction, connection problem, or failure associated with the #4 rear external hydraulic remote valve.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5400
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 6200
• 6400
• 7400
• 7614–7626
• 7714–7726S
• 8200
• 8400

1. 1

   Verify hydraulic fluid (UTTO) level and condition; look for dark, burnt, or milky fluid indicating contamination

2. 2

   Check the hydraulic/transmission filter for blockages that can restrict flow

3. 3

   Inspect the rear remote valve block (Valve 4) for external leaks, specifically from the rear end of the Bosch SB23 valve

4. 4

   Check the wiring harness and dedicated solenoid on Valve 4 for corrosion, loose pins, or damaged wires

5. 5

   Perform a pressure test using a hydraulic gauge on the #4 rear coupler to verify if the valve generates pressure when activated

1. 1

   Prep the Area

   Clean the front and rear of the valve body thoroughly to prevent dirt from entering the hydraulic system.

2. 2

   Disconnect Linkages/Wiring

   Remove any manual backup linkages/levers and disconnect the electronic solenoid harness from Valve 4.

3. 3

   Remove the Rear Pipe

   Unscrew the large pipe/fitting from the rear of the valve. (Note: This can be very tight. Use a 1-1/2" 6-point socket and breaker bar. If the nut breaks loose without turning the pipe, you may need to temporarily tack-weld the nut to the pipe to back it out).

4. 4

   Extract the Spool

   Once the rear pipe is unscrewed, pull the pipe and the valve spool out through the back of the valve body.

5. 5

   Disassemble the Spool

   Clamp the flat front part of the spool in a soft-jaw vise. Carefully unscrew the slotted plug from the rear (it is spring-loaded). Remove the spring, ball cup, and detent balls using a small magnet.

6. 6

   Reseal

   Slide off the detent sleeve and replace all internal O-rings and seals using the components provided in the Spool Valve Repair Kit.

7. 7

   Reassembly

   Reassemble the spool, reinsert it into the valve body, tighten the rear pipe, and reconnect the electronic solenoid. Clear the DTC codes using a compatible diagnostic tool.