132-9420 Flat Idler Pulley Replaces 106-2175 Flat Idler Pulley for Toro 50" 42" Timecutter SS5000 SS4235 SS4225 MX5060 SS5060 MX5050 Z5000 Z4200 MX5000 SS4200 Z5035 Riding Mowers

What It Is

This is a flat idler pulley (part 132-9420) that tensions and guides the mower deck belt on select Toro zero-turn and riding mowers. It’s a direct replacement for the OEM 106-2175 pulley, used on 42- and 50-inch deck models to maintain belt tension and prevent slipping during cutting.

Fitment & Compatibility

Before buying, confirm your mower’s model and deck size. This pulley fits:

• Toro TimeCutter SS5000, SS4235, SS4225, SS4200, SS5060, SS5035
• Toro Z5000, Z4200, Z5035, MX5060, MX5050, MX5000
• Deck sizes: 42” and 50” (not 44” or 54”)
• OEM part numbers: 132-9420 (new) and 106-2175 (original)

Check your current pulley’s outer diameter (3.5”) and bearing type (sealed steel). If your mower uses a different pulley size or a spring-loaded tensioner design, this won’t work. Measure your old pulley and verify the belt routing diagram for your deck.

Key Things to Know

• Quality: Aftermarket replacement, but matches OEM specs. Sealed bearing reduces dust ingress—expect 2–3 seasons of typical use.
• Installation difficulty: Easy (20–30 minutes). Requires basic hand tools: socket/wrench for the center bolt (usually 5/16” or 3/8”). No special puller needed.
• Common gotcha: Torque the center bolt to 20–25 ft-lbs. Overtightening can warp the pulley or damage the bearing. Use a thread locker if the bolt loosens over time.
• Compatibility note: Not for decks with a grooved idler pulley—this is a flat-face pulley. Double-check your belt type (flat vs. V-belt).

Should You Buy It

If your Toro 42” or 50” deck needs a flat idler pulley and you want a reliable, budget-friendly replacement that matches OEM fit, this is a solid choice. Avoid it if your deck uses a grooved or different-sized pulley, or if you prefer OEM-only parts.