1751295M91 Tachometer Drive Assembly Fits Massey Ferguson 50 202 1080 1100 3165 +

What It Is

The 1751295M91 Tachometer Drive Assembly is a replacement mechanical drive unit that powers the tachometer on Massey Ferguson tractors and mowers. It connects the engine’s timing gear to the tachometer cable, ensuring accurate RPM readings for proper throttle and PTO operation.

Fitment & Compatibility

• Models: Fits Massey Ferguson 50, 202, 1080, 1100, 3165, and similar models with mechanical tachometers. Not for electronic dashboards or later digital tach systems.
• OEM vs Aftermarket: This is an aftermarket replacement for OEM part 1751295M91. Verify your original part number matches before buying.
• Measurements: Check the drive shaft length (typically ~2.5 inches) and gear tooth count (usually 10 or 12 teeth) to match your engine’s timing gear. Measure the mounting bolt pattern (two holes, center-to-center ~1.5 inches).
• Cable Connection: Ensure your tachometer cable end (square or round) matches the drive output. Some models use a 0.130” square drive, others a 0.125” round pin.

Key Things to Know

• Installation Difficulty: Moderate. You’ll need to remove the timing cover to access the drive gear. Expect 1–2 hours if you’re mechanically handy; a service manual helps.
• Gear Condition: Inspect the old drive’s gear for wear before buying—if the teeth are sheared, the new unit should solve it. If the cable is seized, replace that too.
• Lubrication: The drive assembly is not pre-greased. Apply a light coat of high-temp grease to the gear and shaft during installation to prevent premature wear.
• Common Gotcha: The drive housing can crack if over-tightened. Torque mounting bolts to 8–10 ft-lbs only—hand-tight plus a quarter turn is safer.

Should You Buy It

If your Massey’s tachometer is dead or bouncing erratically, and you’ve confirmed the cable is intact, this drive assembly is a cost-effective fix. It’s a solid aftermarket option for older mechanical tach systems, but skip it if your model uses an electronic gauge or if the timing cover is damaged—those require different parts.