783-05946 Idler Pivot Bracket & 738-04162C Shoulder Spacer Compatible with MTD - Fits Models 13AX915T004 (2010) 13AX915T004 (2011) Models

What It Is

This is a replacement idler pivot bracket (783-05946) and shoulder spacer (738-04162C) set for MTD-branded lawn tractors. It keeps the belt tensioned on the deck spindle system, preventing belt slip and blade speed loss during mowing.

Fitment & Compatibility

• Direct fit for MTD models 13AX915T004 (2010 and 2011 versions) – check your model tag under the seat or on the frame.
• Deck size: Typically 42-inch or 46-inch fabricated decks on these year models; measure your deck width to confirm.
• OEM cross-reference: MTD part numbers 783-05946 (bracket) and 738-04162C (spacer). Aftermarket set is a drop-in replacement.
• What to verify: Ensure your existing bracket has a round pivot hole (not oblong) and that the shoulder spacer is the same length (about 1 inch). If your old bracket is bent or the spacer is worn, this set solves it.

Key Things to Know

• Quality: Aftermarket steel bracket is comparable to OEM; the shoulder spacer is hardened steel. Check for burrs on the spacer before install – file them down if present.
• Installation difficulty: Easy (15–20 minutes). Remove the deck belt, unbolt the old bracket with a 3/8” socket, swap in the new bracket and spacer, then re-tension the belt per your manual.
• Common gotcha: The shoulder spacer must be installed with the shoulder facing the bracket (not the pulley). Reversing it will throw off belt alignment.
• Belt check: While you’re in there, inspect the idler pulley bearing for play – a worn pulley can cause premature bracket wear.

Should You Buy It

If your MTD mower is from the 2010–2011 13AX915T004 series and the deck belt is slipping, squeaking, or the bracket is visibly bent or cracked, this $13.79 set is a cheap, exact-fit fix. It’s ideal for DIY owners who want to avoid a $60+ OEM bracket and can handle a simple swap. Not needed if your bracket is straight and the spacer is intact.