UDC Parts 532196106 Idler Pulley / 42 46 48 54 inch Deck/Replacement for Craftsman Husqvarna Ariens Poulan 532197379 197379 196106 MZ 54 RZ 5424 YTH24K48 2042 LS YTH24V54 LGH2654

What It Is

This is a replacement idler pulley for the belt drive system on 42-, 46-, 48-, and 54-inch cutting decks used by Craftsman, Husqvarna, Ariens, and Poulan zero-turn and lawn tractors. It guides and tensions the deck belt to keep blades spinning at the correct speed.

Fitment & Compatibility

• Deck sizes: 42", 46", 48", 54" (check your deck’s stamped model number).
• Common models: MZ 54, RZ 5424, YTH24K48, 2042 LS, YTH24V54, LGH2654.
• OEM cross-references: Replaces 532197379, 197379, and 532196106.
• Measurements: 4.0" outer diameter, 1/2" bore, 3/8" wide groove for a standard A-section belt. Measure your old pulley’s OD, bore, and groove width to confirm.
• Note: Not for zero-turn decks with a different pulley offset or larger bore (e.g., 5/8" or 3/4"). Verify your deck’s idler arm bolt size.

Key Things to Know

• Quality: Steel construction with a sealed ball bearing. Holds up well under normal residential use—no premature wobble reported.
• Installation: Moderate difficulty. You’ll need a socket or wrench (typically 1/2" or 5/8") and may need to release belt tension by removing the deck or loosening a spring-loaded arm. Takes about 20–30 minutes.
• Gotcha: The pulley flange orientation matters—make sure the flat side faces the belt. Installing it backwards can cause belt slip or premature wear.
• Common failure sign: A squeaking or chirping noise from the deck area, often accompanied by a wobbly pulley. Replace both idler pulleys at the same time if your deck has two.

Should You Buy It

If your Craftsman, Husqvarna, Ariens, or Poulan tractor has a 42–54 inch deck and you’re hearing belt noise or seeing a wobbly pulley, this is a reliable, budget-friendly fix. It’s a direct fit for most common residential mowers and priced well below OEM without sacrificing durability.