1720532 PTO Clutch | Replaced by 01008434

April 23, 2026

1720532 PTO clutch cross reference banner showing a replacement PTO clutch with text stating Replaced by 01008434.

If your original PTO clutch is stamped 1720532, the correct current replacement is 01008434.

This replacement question usually comes up when a mower owner finds 1720532 on the original clutch, parts diagram, or older dealer paperwork and wants to know which number to order now. In this family, 1720532 is an older OEM reference tied to the same multi-fit PTO clutch group now commonly sold as 01008434.

That means the important change is the catalog number, not the basic clutch family. For fitment purposes, 1720532 routes to 01008434 when the mower application matches this established 1-inch bore, approximately 5.35-inch pulley replacement group.

What Changed, and What Did Not

What changed was the catalog number. What did not change was the core clutch family. This replacement is still built around the same fitment profile used across older Simplicity, Snapper, Ferris, and related mower platforms:

1-inch crankshaft bore
Approximately 5.35-inch pulley diameter slight variance up to a quarter inch is common for multi-fit aftermarket replacement clutches
CCW rotation from the pulley side
Electric PTO clutch design verify overall height if possible and visually compare with the old unit before installation
Operating range up to 3600 RPM
Approximate torque rating of 120 FT-LBS

Related OEM Cross-Reference Numbers in This Family

Although this page focuses on 1720532, the same PTO clutch family also appears under several other OEM numbers across multiple mower brands.

MTD / Cub Cadet / Craftsman: 01008434, 01008434P, 1008434, 759-05064
Simplicity / Snapper / Ferris: 5023100, 5023100SM, 1717664, 1717664SM, 1720532, 1757359, 1757359YP
Toro / Wheel Horse: 124833, 539124833
Additional interchange numbers: 7029232, 51110100, 35016, 33386

If you started with 1720532, or any part number listed above, the correct replacement is the 01008434 PTO clutch.

Common Simplicity, Snapper, and Ferris Applications

This replacement family is commonly associated with older Simplicity, Snapper, and Ferris mower platforms using 44-inch to 54-inch deck systems and a 1-inch bore electric PTO clutch setup.

Simplicity: 2750, ZT2300, ZT1842, ZT21546, selected Cobalt Series models
Snapper: selected SZT series applications
Ferris: HydroCut walk-behind models including 5900111, 5900543, 5900544, 5900545, 5900546

This model list is a helpful starting point, but the most reliable fitment check is still matching the OEM number stamped on the original clutch.

How to Verify the Correct Replacement

Before ordering, confirm the original clutch matches this family:

Match the stamped OEM number on the clutch housing
Confirm 1-inch bore
Confirm an approximate 5.35-inch pulley diameter
Confirm CCW rotation from the pulley side
Compare the wiring lead and connector style

If those details line up, 01008434 is the correct replacement path.

Do Not Confuse It with Similar-Looking Clutches

One of the easiest mistakes is choosing a clutch that looks similar but belongs to a different pulley size or OEM family. A clutch may bolt on and still create belt slip, weak blade speed, squeal, or poor deck performance.

This is especially important when comparing older multi-fit clutch families. Always verify the original OEM number first, then confirm bore and pulley diameter before ordering.

Common Symptoms of a Failed 1720532 PTO Clutch

Blades will not engage
Deck engagement is intermittent
Clutch clicks but the belt does not drive properly
Blades slow down or stop in heavier grass
Bearing noise during startup or shutdown
Heat buildup or burnt smell near the clutch area

FAQ

Why does 1720532 now show up as 01008434?

Because replacement catalogs often roll older OEM numbers into a current multi-fit replacement number. In this case, 1720532 routes to 01008434.

Is 01008434P different from 01008434?

No. The P suffix typically indicates a packaged service version of the same clutch, not a different fitment family.

What should I check before ordering if my old clutch is worn or hard to read?

Lookup by brand model and serial numbers, then confirm the 1-inch bore, approximately 5.35-inch pulley diameter, CCW rotation from the pulley side, and wiring layout. A quick visual comparison with the original unit is also smart.