A.50.21

Massey Ferguson A.50.21 – Onboard diagnostic system: External Hydraulic Valve 5 Issue

Issue description

Indicates a fault, connection problem, or failure within the circuit of the 5th external hydraulic remote valve (spool valve).

Wiring harness attached to External Hydraulic Valve 5 for corrosion, damage, or loose connections
Electrical connectors and solenoids attached to External Hydraulic Valve 5 for corrosion, damage, or loose connections

Retrieve and Verify
Use a compatible Massey Ferguson diagnostic tool or interface device to pull the active codes and confirm 0A.50.21 is present.
Inspect Connections
Inspect the wiring harness, electrical connectors, and solenoids attached to External Hydraulic Valve 5 for corrosion, damage, or loose connections.
Consult Service Manual
Refer to the specific tractor's OEM service manual or consult with a qualified technician to interpret the electrical testing parameters for the valve before replacing parts.

(5)

Hydraulic Spool/Distribution Valve
3713928M5
Fits 3600, 8100, and 8200 series tractors. Alternate/superseded numbers: 3713928M4, 3713928M3, 3713928M2, 3713928M1, 3902064M91
3713928M5

Single Hydraulic Remote Valve
12012002
Bolts to the Lift Cover. Fits utility models including 135, 165, 240, 285, 390, and 399
12012002

Hydraulic Control Valve Assembly
1681789M91
S.4785. Fits models like 20C, 20D, 230, 240
1681789M91

Hydraulic Pump Control Valve Assembly
1862486M96
Aftermarket brand: Reliance
1862486M96

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