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 common PTO clutch symptoms, where the clutch is located, 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, friction surfaces, and the electromagnetic coil can degrade, leading to slipping, overheating, intermittent engagement, or complete failure to engage.
Many Gravely Pro-Master applications use OEM part number 00191700, also listed as 191700. This clutch family commonly cross-references to Warner 5219-45, Xtreme X0005, Stens 255-825X, and Oregon 33-130.
If your original clutch is marked 00191700, 191700, or Warner 5219-45, compare it to the 00191700 PTO clutch replacement.
For broader Gravely coverage, see our Gravely PTO clutch replacement guide. For full 00191700 model and fitment details, see our 00191700 PTO clutch fitment guide.
Common Gravely Pro-Master Models
The 00191700 PTO clutch family is commonly associated with select Gravely Pro-Master models, including:
- Gravely Pro-Master 34Z
- Gravely Pro-Master 44Z
- Gravely Pro-Master 144Z
Because Pro-Master models were produced across multiple configurations, always verify the OEM part number stamped on your original clutch before ordering.
00191700 PTO Clutch Specs for Gravely Pro-Master
The 00191700 clutch family is generally associated with the following core specifications:
- OEM Number: 00191700, 191700
- Warner Cross-Reference: 5219-45
- Crankshaft Bore: 1"
- Pulley Diameter: 6.00"
- Rotation: CCW from pulley side
- Voltage: 12V DC
- Torque Rating: 125 ft-lbs
- Belt Width Compatibility: 1/2" or 5/8" A/B belt profile
Specs should always be compared against the original PTO clutch before installation, especially on older commercial and semi-commercial Gravely machines.
Replaces OEM Part Numbers
This Gravely Pro-Master fitment path should be verified against the part number stamped on your original clutch. For the 00191700 clutch family, common replacement and cross-reference numbers include:
- Ariens / Gravely: 00191700, 191700
- Warner Electric: 5219-45, 521945
- Xtreme: X0005
- STENS: 255-825X
- Oregon: 33-130
- 8TEN: 810-CPT2354O
Common Signs of a Failing PTO Clutch on Gravely Pro-Master
- Blades will not engage when the PTO switch is activated
- PTO clutch clicks but the deck belt does not move
- 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, discoloration, or heat damage on the clutch housing
If these symptoms appear, the PTO clutch may be worn or failing, but belt routing, idler pulleys, blade spindles, wiring, PTO switch, battery voltage, and charging system condition should also be inspected.
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 safely or removing the deck to inspect the clutch assembly, wiring connector, pulley, belt path, and anti-rotation bracket.
How to Confirm the Correct PTO Clutch
The most reliable way to identify the correct replacement is to match the OEM part number stamped, labeled, or engraved on your original clutch.
If your Gravely Pro-Master clutch is marked 00191700, 191700, or Warner 5219-45, use the 00191700 PTO clutch replacement as your first comparison.
If the original clutch number is unreadable, confirm fitment using your mower model, product code, serial number, deck size, engine package, pulley diameter, crankshaft bore, rotation, wiring connector, and anti-rotation bracket setup.
- Match the OEM clutch number whenever possible
- Confirm the crankshaft bore is 1"
- Measure the pulley diameter
- Confirm CCW or CW rotation
- Compare the wiring connector or lead style
- Check the anti-rotation bracket or stop location
- Confirm the mower model, product code, serial number, engine setup, and deck size
Important Fitment Note
The 00191700 clutch family is its own Ariens / Gravely / EverRide PTO clutch group and commonly cross-references to Warner 5219-45. It is not superseded by, replaced by, or the same listing as Toro / Exmark 110-6766.
Only use a different PTO clutch family if your original OEM number, pulley diameter, crankshaft bore, rotation, wiring connector, and anti-rotation setup all match that application.
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
- 00191700 PTO Clutch Fitment Guide
Find the Right PTO Clutch for Gravely Pro-Master
If your Gravely Pro-Master blades are not engaging correctly, confirming the OEM part number on your original clutch is the most important step before selecting a replacement.
If your original clutch matches 00191700, 191700, or Warner 5219-45, shop the 00191700 PTO clutch replacement.
You can also browse the full Gravely PTO clutch collection or contact us for fitment assistance.
Fitment note: PTO Direct USA sells aftermarket replacement parts and is not affiliated with or endorsed by AriensCo, Gravely, Warner Electric, or any original equipment manufacturer. Brand names, model names, and OEM numbers are used for fitment identification only.