Massey Ferguson A.43.29: External Hydraulic Valve 4 Issue

Malfunction, connection problem, or flow/pressure restriction specifically isolated to the 4th external hydraulic remote valve (spool 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

   Inspect the hydraulic fluid (UTTO) for contamination (dirt or metal shavings) and check the hydraulic/transmission filters for blockages that restrict flow.

2. 2

   Inspect the wiring harness and electrical connector going to External Valve 4 for corrosion, broken pins, or frayed wires (connection problems).

3. 3

   Check for sticking spools by observing for jerky movements or a dead remote, which indicates physical sticking due to wear or friction.

4. 4

   Inspect the quick couplers on Valve 4 for damage or blockages that could be deadheading the hydraulic pressure.

1. 1

   Depressurize the System

   Turn off the tractor and cycle the hydraulic control levers to relieve all hydraulic pressure before servicing the valve.

2. 2

   Drain Fluid (If Necessary)

   If the hydraulic fluid is contaminated, drain the reservoir and prepare to flush the system.

3. 3

   Disconnect Valve 4

   Locate External Hydraulic Valve 4 at the rear remote block. Disconnect its electrical harness connector.

4. 4

   Remove the Valve

   Unbolt the hydraulic lines, hoses, and mounting hardware securing the valve assembly.

5. 5

   Clean or Replace

   If the valve spindle is merely jammed, it can sometimes be disassembled, cleaned, and unstuck. However, if the internal solenoids or seals are failed, install a new replacement hydraulic control valve assembly.

6. 6

   Reassembly

   Mount the new valve, reconnect the hydraulic lines, and plug in the electrical connector.

7. 7

   Service Filters and Fluid

   Replace the hydraulic filter and refill the system with clean OEM UTTO fluid (e.g., 10W40).

8. 8

   Test

   Start the tractor, allow the system to warm up, and test the #4 remote with an implement to ensure proper pressure, flow, and no leaks.