Hitachi Fault Code
Free · no signupW:1304
Hydraulic Slowdown.
System
Not specified
Symptom
Hydraulic Slowdown.
Diagnosis & fix steps
LOGIC: Hydraulic Oil Temperature High.
ACTION: Clean oil cooler fins; check fan belt tension and bypass valve.
Red Seal field insights
Red Seal Fix: On Dash-5 models, the "Shuttle Valve" in the cooler circuit often sticks. If the cooler is cold but the engine is hot, the valve is bypassed.
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