A.12.23

Massey Ferguson A.12.23 – The Dash / The Mid Mount Valve Module: External Hydraulic Valve 1 Issue

Issue description

This indicates a malfunction or fault condition associated with the first external hydraulic spool valve on the tractor.

Scan for related codes using a compatible diagnostic tool (e.g., 0B.00.17 through 0B.00.21 for spool position sensor issues, or 0B.00.22 and 0B.00.23 for valve calibration issues).
Inspect the connection faces on the hydraulic multicoupler. Ensure the O-rings are in place and clean all dirt and debris from the fittings.
Inspect the hydraulic hoses for leaks or damage. Check the fluid levels on all gearboxes and the hydraulic system to ensure they are at the correct capacity.
Verify the wiring harness and communication lines between the Dash and the Mid Mount Valve Module.

Clean the system
Clean any material buildup or debris from the hydraulic multicoupler and external valve fittings.
Replace O-rings and hoses
If the diagnostic inspection reveals missing O-rings or damaged hydraulic hoses at Valve 1, replace them.
Address sensor issues
If spool position sensor codes (e.g., 0B.00.17) are present alongside A.12.23, replace the Spool Position Sensor on External Valve 1.
Recalibrate valves
If calibration codes are present, perform a valve calibration procedure using the tractor's diagnostic interface.
Replace the valve
If the spool valve itself is mechanically failed or the internal solenoids are shorted, remove and replace the External Hydraulic Valve 1 assembly.

(3)

External Hydraulic Valve 1 (Spool Valve)
1026699M92
Legacy single-spool valve kit (TISCO TS3200M). Diverter valve: 180908M1 or 357018A. Modern Tier 4 exact valve part numbers vary by specific chassis.
1026699M92

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