The Galion/Dresser 850 Motor Grader is a heavy‑equipment articulated grader equipped with a turbocharged diesel engine, 6‑speed full powershift transmission, and integral torque converter for high‑torque grading tasks. Common failure modes include hydraulic pump seal leaks, power shift clutch wear, and electronic control board faults that trigger “shift” or “motor” error codes; the U‑shaped shift assembly (part 1439905H91) is frequently replaced due to bearing fatigue. First‑check diagnostics: verify 24 V battery voltage and alternator output, inspect hydraulic fluid level/condition for leaks, and review the grader’s electronic control unit logs for shift or motor fault codes before proceeding with mechanical inspection.[oss-gpt-20b]