Overview
The Ogura GT1A-HU02 PTO clutch is a common electric PTO clutch used across multiple mower brands under different OEM part numbers. Depending on the mower brand, this same clutch family may be searched as Ariens / Gravely 00200665, Husqvarna 539112233, John Deere TCA20484, Snapper 885443, or Simplicity 885443YP.
This guide explains the major GT1A-HU02 part-number paths, how the Ariens / Gravely side relates to the Husqvarna / John Deere / Snapper side, why pulley measurements can look different online, and what to verify before ordering a replacement.
Do not order by appearance alone. Match the original clutch number first, then confirm bore size, rotation, pulley style, belt width, connector style, anti-rotation setup, mounting bolt requirements, mower model, and serial number.
Quick Answer
If your original clutch is marked Ogura GT1A-HU02, the correct replacement path depends on which OEM part number your mower uses.
| Buyer Search Path | Common OEM Numbers | Recommended Product Page |
|---|---|---|
| Ariens / Gravely | 00200665, 00899800, 200665 | Shop 00200665 PTO Clutch Replacement |
| Husqvarna / John Deere / Snapper / Simplicity | 539112233, TCA20484, 885443, 885443YP | Shop 539112233 PTO Clutch Replacement |
These pages are separated by buyer search path to make fitment easier. The Ariens / Gravely page focuses on 00200665 and related Gravely serial-number notes. The Husqvarna / John Deere page focuses on 539112233, TCA20484, 885443, and 885443YP.
Ogura GT1A-HU02 OEM Cross Reference
The GT1A-HU02 clutch family is commonly routed through the following OEM part numbers:
| Brand / OEM Path | Part Numbers | Notes |
|---|---|---|
| Ariens / Gravely | 00200665, 00899800, 200665 | Common Ariens / Gravely GT1A-HU02 path. Check Gravely ZT HD serial number before ordering. |
| Great Dane | 00200665 | Used on select Great Dane commercial mower applications. |
| Husqvarna / AYP | 539112233, 112233, 588067801 | Common Husqvarna and AYP-built mower path. |
| Craftsman / AYP | 539112233, 400008, 414336, 414717, 532414336 | Verify original number and mower application before ordering. |
| John Deere | TCA20484 | Commonly associated with select John Deere commercial walk-behind mower applications. |
| Snapper / Simplicity | 885443, 885443YP | Used on select Snapper and Simplicity applications using the GT1A-HU02 path. |
Shop by Fitment Path
Ariens / Gravely 00200665 Path
Use this path if your original clutch, parts diagram, or mower manual points to Ariens / Gravely 00200665, 00899800, 200665, or Ogura GT1A-HU02.
Shop the 00200665 PTO Clutch Replacement for Ariens & Gravely
Husqvarna / John Deere / Snapper / Simplicity Path
Use this path if your original clutch, parts diagram, or mower manual points to Husqvarna 539112233, John Deere TCA20484, Snapper 885443, Simplicity 885443YP, or Ogura GT1A-HU02.
Shop the 539112233 PTO Clutch Replacement for Husqvarna & John Deere
Physical Specs to Verify
The GT1A-HU02 clutch family is commonly associated with the following physical specifications. Always confirm these against your original clutch before ordering.
| Spec | Common GT1A-HU02 Value | Fitment Note |
|---|---|---|
| Clutch Type | Electric PTO clutch | Used to engage the mower deck belt system. |
| Voltage | 12V DC | Check PTO switch, wiring, fuse, battery voltage, and ground before replacing the clutch. |
| Crankshaft Bore | 1 inch | Must match the engine crankshaft size. |
| Rotation | CCW from pulley side | Confirm rotation from the pulley side before ordering. |
| Pulley Style | V-groove mower deck belt pulley | Different listings may measure different points of the pulley. |
| Belt Path | 1/2-inch or 5/8-inch belt references may appear | Confirm your mower deck belt width and pulley fit. |
| Connector | Two-wire PTO clutch connector | Connector and harness length can vary by brand and aftermarket supplier. |
| Anti-Rotation Setup | Slot / anchor style setup | Must match the mower’s clutch anchor arrangement. |
Why Do GT1A-HU02 Pulley Measurements Look Different?
One of the most confusing parts of the Ogura GT1A-HU02 clutch path is pulley diameter. Some listings may show measurements around 5-5/16 inch, 5-15/16 inch, 6.00 inch, or 6.10 inch.
This does not always mean the listings are for different clutches. A V-groove PTO clutch pulley can be measured at different points. A narrower belt can ride deeper in the groove, while a wider belt can ride higher. Some sellers measure the belt contact area, while others measure the outside pulley flange.
Fitment rule: Do not use pulley diameter alone to choose this clutch. Match the original clutch number first, then confirm bore size, rotation, belt width, connector style, pulley alignment, anti-rotation setup, and mower model.
Important Gravely 991084 ZT HD 60 Serial Number Split
Gravely model 991084 has an important serial-number split. Do not order by model number alone. The early serial range uses the 00200665 / Ogura GT1A-HU02 clutch path, while later serial ranges route to 04387900 / Ogura GT1A.
| Model | Serial Range | Application Description | Correct Clutch Path |
|---|---|---|---|
| Gravely 991084 | 000101 - 009999 | ZT HD 60 | 00200665 / Ogura GT1A-HU02 |
| Gravely 991084 | 010000 - 019999 | ZT HD 60 | 04387900 / Ogura GT1A |
| Gravely 991084 | 020000 - 029999 | ZT 60 HD, Kawasaki, 60-inch deck | 04387900 / Ogura GT1A |
| Gravely 991084 | 030000 and higher | ZT HD 60 / later serial ranges | 04387900 / Ogura GT1A |
Fitment rule: If your Gravely 991084 serial number is 000101 through 009999 and your original clutch number matches 00200665 or Ogura GT1A-HU02, use the 00200665 PTO clutch replacement. If your serial number is 010000 or higher, use the 04387900 PTO clutch replacement.
Connector note: A different plug, wire length, or harness routing is a valid reason for Ariens / Gravely to use a different clutch part number. Do not assume the early and later clutches are interchangeable just because the pulley, bore, or Ogura family looks similar.
Compatible Brand & Model Families
The GT1A-HU02 clutch path appears across several brand families. Model-level fitment can vary, so always confirm the OEM clutch number from your mower before ordering.
Ariens / Gravely Applications
- Gravely ZT HD Series: select ZT HD 44, ZT HD 48, ZT HD 52, and ZT HD 60 applications using 00200665
- Gravely Pro-Walk: select gear-drive and hydro walk-behind applications
- Gravely Pro-Stance: select stand-on mower applications
- Ariens Max Zoom: select Max Zoom and Max Zoom HD applications
- Ariens Professional Walk: select commercial walk-behind mower applications
- Ariens Surfer / Scorpion: select stand-on mower applications
Husqvarna / AYP Applications
- Husqvarna EZ Series: EZ4216, EZ4216HO, EZ4217KAA, EZ4819KAA, EZ4822, EZ4824, EZ5221KAA, EZ5424, EZ5426, EZ6124
- Husqvarna Z-Series: select Z-series applications such as Z4217
- Husqvarna Walk-Behind: select W-series commercial walk-behind applications
- AYP-built platforms: select Craftsman, Dixon, Poulan, Jonsered, and related applications using the same OEM clutch number
John Deere Applications
- John Deere Commercial Walk-Behind: WG32A, WG36A, WG48A
- John Deere Commercial Walk-Behind: WH36A, WH48A, WH52A, WH61A
- John Deere Commercial Walk-Behind: WHP36A, WHP48A, WHP52A, WHP61A
Snapper / Simplicity Applications
- Snapper: select 38-inch tractor applications using 885443 or 885443YP
- Simplicity: select Regent / ELT-style applications using 885443YP
Great Dane Applications
- Great Dane Chariot: select 48, 52, and 61-inch applications
- Great Dane Scamper: select hydro walk-behind applications
- Great Dane Surfer: select stand-on mower applications
Do Not Confuse GT1A-HU02 With Other Ogura Clutches
Ogura clutch numbers can look similar, but that does not make them interchangeable. Confirm the full clutch number and physical specifications before ordering.
- GT1A-HU02: common Ariens / Gravely 00200665, Husqvarna 539112233, John Deere TCA20484, and Snapper / Simplicity 885443 path
- GT1A-MT08: appears on some later Gravely ZT HD applications; verify serial number, wire length, and mounting bolt requirements
Even when two clutch paths share major dimensions, harness length, connector routing, bolt length, and anti-rotation setup can affect installation.
Before Ordering
Before ordering a GT1A-HU02 replacement, confirm:
- Original clutch number stamped on the old clutch
- OEM part number from the mower parts diagram
- Mower brand, model, and serial number
- Crankshaft bore size
- Pulley style and belt width
- Rotation from pulley side
- Connector style and wiring length
- Anti-rotation slot and anchor setup
- Mounting bolt length and crankshaft thread depth
- Deck belt routing and pulley alignment
Do not order by appearance alone. Similar-looking electric PTO clutches can have different offsets, wire lengths, pulley profiles, torque ratings, and mounting requirements.
Common Symptoms of a Failing PTO Clutch
- Blades will not engage when the PTO switch is activated
- PTO clutch clicks but the mower deck does not start
- Blades engage cold but stop after the mower heats up
- Deck engagement slips under load
- Fuse blows when the PTO is engaged
- Burning smell near the clutch or belt area
- Grinding, rattling, or bearing noise near the clutch
- Visible heat damage, wobble, or bearing play
Before replacing the clutch, also check the PTO switch, battery voltage, fuse, ground, wiring connector, deck belt routing, spindle drag, and idler pulley condition.
Learn More About Ogura PTO Clutch Systems
Ogura is a major OEM supplier of electromagnetic clutch and brake systems used across lawn, turf, industrial, and outdoor power equipment platforms. Many mower brands use Ogura-built PTO clutch systems under their own OEM part numbers, which is why one Ogura clutch number can appear across multiple Ariens, Gravely, Husqvarna, John Deere, Snapper, and Simplicity applications.
For more background on Ogura as an OEM clutch supplier, their manufacturing history, and how their electromagnetic PTO clutch systems are used in mower platforms, visit our Ogura PTO Clutch Systems Overview.
Related Products
- 00200665 PTO Clutch Replacement for Ariens & Gravely
- 539112233 PTO Clutch Replacement for Husqvarna & John Deere
Related Pages
- Ogura PTO Clutch Systems Overview
- 04387900 PTO Clutch Replacement for Gravely ZT HD
- Ariens PTO Clutches
- Gravely PTO Clutches
- Husqvarna PTO Clutches
- John Deere PTO Clutches
- All Electric PTO Clutches
FAQ
What does Ogura GT1A-HU02 replace?
The Ogura GT1A-HU02 clutch family is commonly cross-referenced with Ariens / Gravely 00200665, Ariens / Gravely 00899800, Husqvarna 539112233, John Deere TCA20484, Snapper 885443, and Simplicity 885443YP.
Is Ariens / Gravely 00200665 the same as Ogura GT1A-HU02?
Yes, the Ariens / Gravely 00200665 path is commonly associated with the Ogura GT1A-HU02 clutch family. Confirm your original clutch number, mower model, and serial number before ordering.
Is Husqvarna 539112233 the same as Ogura GT1A-HU02?
Yes, Husqvarna 539112233 is commonly routed to the Ogura GT1A-HU02 clutch family. It is also commonly searched alongside John Deere TCA20484 and Snapper / Simplicity 885443 references.
Why do some GT1A-HU02 listings show 5-5/16 inch and others show 6.10 inch?
The pulley may be measured at different points. Some listings measure the belt contact area inside the V-groove, while others measure the outside flange. Match the original clutch number first and confirm the full physical setup before ordering.
Does this guide apply to every Gravely ZT HD mower?
No. Some Gravely ZT HD models have a serial-number split between the earlier 00200665 / GT1A-HU02 path and the later 04208100 / GT1A-MT08 path. Confirm your serial number and original clutch number before ordering.
Can I use the same physical clutch for different brand search paths?
In many cases, yes, the same Ogura clutch family may appear under different OEM numbers. However, brand-specific pages are still useful because mower models, serial notes, harness routing, mounting bolts, and customer search behavior can differ.
What should I send if I need help confirming fitment?
Send your mower brand, model, serial number, original clutch number, photos of the clutch label, pulley, connector, anti-rotation setup, mower ID tag, and deck belt routing.
Need help confirming fitment? Contact PTO Direct USA with your mower model, serial number, original clutch number, and clear photos before ordering.