Massey Ferguson 0A.40.12 – Implement/Hydraulic Control Unit or Tractor Control Unit (TCU): External Hydraulic Valve 4 Issue
Issue description
Malfunction, communication error, or electrical fault within the circuit or mechanical operation of the 4th external hydraulic remote/spool valve.
Applies to these machines
41 machines- 7724S
- 5712SL
- 7722
- 7722S
- 5713SL
- 7720S
- 7716
- 7718
- T4
- 7715
- 5710SL
- 7726
- 7726S
- 5711SL
- 7718S
- 7719
- 7714
- 7716S
- 7720
- Tier 4 (2015-2021)
- 7715S
- 7724
- 4707
- 4708
- 4709
- 4710
- 5608
- 5609
- 5610
- 5611
- 5612
- 5613
- 7614
- 7615
- 7616
- 7618
- 7619
- 7620
- 7622
- 7624
- 7626
Check the cause
Wiring harness and electrical connectors at External Hydraulic Valve 4
Repair steps
Confirm code status
Retrieve the code using a compatible Massey Ferguson diagnostic tool to confirm the active status of 0A.40.12.
Inspect wiring and connectors
Inspect the wiring harness and electrical connectors at External Hydraulic Valve 4 for corrosion, damage, or loose connections.
Perform voltage and pressure tests
Consult the specific tractor's OEM service manual for pinout voltage testing and hydraulic pressure verification before replacing the valve.
Parts you might need
(6)External Hydraulic Valve / Auxiliary Spool Valve
Generic part required for Tier 4 models
Hydraulic Pump Control Valve Assembly
1862486M96Replaces 897507M94, 897507V92 (primarily fits older mechanical models)
Hydraulic Selector / Diverter Valve
180908M1Replaces 1860100M95, 1696239M92 (primarily fits older mechanical models)
Hydraulic Auxiliary Valve
535320M93Primarily fits older mechanical models
Hydraulic Auxiliary Valve
535320M92Primarily fits older mechanical models
Hydraulic Valve Kit
1810678M91Primarily fits older mechanical models
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