If you already know your part number, browse our Toro PTO clutch collection to find a direct replacement for your mower.
Commercial Toro mowing platforms such as the Mid-Size ProLine walk-behind series and GrandStand stand-on mowers rely on electric PTO clutches to transfer engine power to the mower deck. These clutches engage the blade drive belt when the operator activates the PTO switch, allowing the blades to spin under demanding commercial mowing conditions.
This guide explains how PTO clutches are used on Toro ProLine, GrandStand, and related Exmark commercial mower platforms and highlights several of the most common replacement clutch assemblies used on these machines.
How PTO Clutches Work on Toro Commercial Mowers
An electric PTO clutch mounts to the engine crankshaft and engages the mower deck belt when the operator activates the PTO switch. When energized, the clutch creates magnetic force that locks the pulley assembly to the crankshaft, transferring engine power to the mower deck.
Commercial Toro and Exmark platforms often operate in demanding conditions with frequent blade engagement cycles, heavy grass loads, and extended run times. Because of this, PTO clutches are considered a normal wear component on many commercial mower platforms.
If engagement becomes inconsistent or the clutch begins slipping under load, replacing the clutch assembly typically restores proper deck operation.
Common Toro and Exmark PTO Clutch Part Numbers
Several PTO clutch assemblies appear frequently across Toro and Exmark commercial mower platforms. These clutches are typically identified by the OEM part number stamped on the clutch housing.
- 105-2635 PTO Clutch used on Toro GrandStand and Exmark Vantage stand-on mowers
- 116-1620 PTO Clutch commonly used across Toro, Exmark, and other commercial mower platforms
- 103-0665 PTO Clutch found on several Toro Z Master and Exmark commercial units
- 109-7665 PTO Clutch used on select EFI-equipped Exmark and Toro configurations
Because mower configurations vary by deck size, engine, and production year, the most reliable way to confirm compatibility is to match the part number stamped on your original clutch.
Toro Mid-Size ProLine PTO Clutch Applications
The Toro Mid-Size ProLine series includes commercial walk-behind mowers produced across several decades. These machines were commonly equipped with electric PTO clutches designed to operate under continuous commercial workloads.
Common ProLine mower configurations include:
- Mid-Size ProLine Hydro drive walk-behind mowers
- Mid-Size ProLine gear drive commercial units
- Pistol grip hydro traction configurations
- T-Bar gear drive commercial walk-behind models
Many of these machines use clutches with 1 inch crankshaft bores and pulley diameters around 6 to 7.7 inches depending on deck configuration.
Toro GrandStand & Exmark Vantage Clutch Systems
Stand-on mower platforms such as the Toro GrandStand and Exmark Vantage rely on electric PTO clutches to deliver fast blade engagement and reliable torque transfer.
These machines are designed for professional mowing environments where operators frequently engage and disengage the mower deck. As a result, PTO clutches on stand-on machines may experience higher engagement cycles compared to residential equipment.
When clutch performance begins to decline, replacing the clutch assembly restores proper blade acceleration and cutting performance.
How to Identify the Correct Replacement PTO Clutch
The most reliable way to select the correct replacement clutch is to locate the OEM part number stamped on the clutch housing or coil assembly.
Once you have the part number, you can search directly for the replacement or browse our full electric PTO clutch replacement catalog to find the correct match.
Residential Toro mower platforms such as TimeCutter, Titan, and many Z-Master models use a different set of electric PTO clutch assemblies. See our Toro TimeCutter and Titan PTO clutch replacement guide for those platforms.
Shop Toro PTO Clutch Replacements
Ready to replace your PTO clutch? View all available options in our Toro PTO clutch collection, including replacements for ProLine, GrandStand, and commercial mower platforms.