If you already know your part number, browse our Gravely PTO clutch collection to find a direct replacement for your mower.
If your Gravely Pro-Master blades are not engaging, slipping under load, or losing cutting power, a worn PTO clutch is one of the most common causes. These commercial and semi-commercial zero-turn mowers rely on consistent clutch engagement to handle heavier mowing conditions and maintain blade speed.
This guide covers PTO clutch fitment, common failure symptoms, and how to identify the correct replacement for Gravely Pro-Master mower applications.
Gravely Pro-Master PTO Clutch Replacement
The PTO clutch on Gravely Pro-Master models mounts directly to the engine crankshaft and engages the mower deck belt system when the PTO switch is activated. This electromagnetic clutch must engage cleanly and consistently to maintain proper cutting performance under load.
As the clutch wears, internal components such as bearings and friction surfaces degrade, leading to slipping, overheating, or complete failure to engage.
Many Gravely Pro-Master applications use PTO clutch part number 00191700 that fall within the same cross-reference group as our multi-fit 110-6766 PTO clutch.
Because Gravely and Ariens share platform architecture, Pro-Master models often use the same PTO clutch systems found on Ariens Pro-Master equipment.
This multi-fit clutch also cross-references with OEM numbers including 100-6059, 103-9950, 108-9510, 5219-81, 5219-45, and 5219-34A.
For broader Gravely coverage, see our Gravely PTO clutch replacement guide. For full cross-brand fitment, see the 110-6766 PTO clutch fitment guide.
Common Gravely Pro-Master Models
This PTO clutch platform is commonly associated with the following Gravely Pro-Master models:
- Gravely Pro-Master 34Z
- Gravely Pro-Master 44Z
- Gravely Pro-Master 144Z
Because these models were produced across multiple configurations, always verify the OEM part number stamped on your original clutch before ordering.
Replaces OEM Part Numbers
This multi-fit PTO clutch platform is used across multiple mower brands and cross-references with the following OEM and Warner part numbers. Matching your original part number is the most accurate way to confirm compatibility.
- Ariens / Gravely: 00191700
- Toro / Exmark: 110-6766, 103-9950, 100-6059, 108-9510
- Warner: 5219-81, 5219-45, 5219-34A, 5219-34, 5219-58, 5219-63, 5219-66
- Cub Cadet / MTD: 917-04214, 717-04214, 917-04526, 717-04526, 917-04526A
Common Signs of a Failing PTO Clutch on Pro-Master Models
- Blades will not engage when the PTO switch is activated
- Intermittent engagement under load
- Loss of cutting power in thicker grass
- Burning smell or overheating near the clutch assembly
- Squealing or grinding noise from worn bearings
- Visible wear or heat damage on the clutch housing
Where Is the PTO Clutch Located?
The PTO clutch is mounted beneath the engine crankshaft and sits above the mower deck belt system. It engages the blades when the PTO switch is activated.
Access typically requires lifting the mower or removing the deck for inspection.
How to Confirm the Correct PTO Clutch
The most reliable way to identify the correct replacement is to match the OEM part number stamped on your original clutch.
If your clutch matches any of the cross-reference numbers listed above, this is the correct replacement group to verify.
If the OEM number is not readable, confirm fitment using mower model and specifications such as pulley size and crankshaft diameter.
Related Gravely PTO Clutch Guides
Looking for fitment on other Gravely mower platforms? Explore related PTO clutch replacement guides below:
- Gravely ZT PTO Clutch Replacement
- Gravely PTO Clutch Replacement Guide
- 110-6766 PTO Clutch Fitment Guide
Find the Right PTO Clutch for Gravely Pro-Master
If your Gravely Pro-Master blades are not engaging properly, replacing a worn PTO clutch will restore cutting performance and prevent further drivetrain issues.
Shop the 110-6766 PTO clutch replacement or browse the full Gravely PTO clutch collection for more compatible applications.