Massey Ferguson A.50.27 – Onboard diagnostic system: External Hydraulic Valve 5 Issue

This code is generated when the onboard diagnostic system detects a fault, typically a connection problem or electrical malfunction, on the 5th external hydraulic remote valve.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S

1. 1

   Use a compatible diagnostic tool to confirm that 0A.50.27 is the active code

2. 2

   Locate the 5th external hydraulic valve on the rear remote stack for visual inspection

3. 3

   Inspect the electrical wiring harness and the connector plugging into Valve 5 for corrosion, moisture, backed-out pins, or physical damage

4. 4

   Refer to the specific tractor's service manual to interpret the exact voltage/resistance specifications for the valve solenoid before condemning the part

1. 1

   Power down tractor

   Disconnect the battery or ensure the tractor is powered down to prevent short circuits.

2. 2

   Disconnect electrical plug

   Disconnect the electrical plug at External Hydraulic Valve 5.

3. 3

   Clean contacts and inspect harness

   Clean the contacts with electrical contact cleaner. If the wiring harness is damaged, repair or replace the affected pigtail/harness section.

4. 4

   Test solenoid resistance

   Test the solenoid on Valve 5 for proper resistance. If the solenoid is internally shorted or open, the solenoid (or the entire valve slice, depending on the model's parts breakdown) must be replaced.

5. 5

   Install new valve or solenoid

   Install the new valve or solenoid, ensuring O-rings are properly seated if hydraulic lines were opened.

6. 6

   Reconnect harness

   Reconnect the electrical harness.

7. 7

   Clear DTC

   Use the diagnostic tool to clear the 0A.50.27 DTC from the system.

8. 8

   Test operation

   Test the operation of the 5th remote valve to ensure the code does not return.