Identifying your SAE flywheel size can sometimes be a daunting task if you are not experienced in the industrial engine sector. When selecting a Power Take-off (PTO) for an application, clutches are normally chosen based on the engine SAE Housing & Flywheel size that meets the SAE J617 and SAE J620 standards. Other factors play into choosing the correct PTO, but the baseline for choosing the clutch size is based on the SAE Flywheel.
SAE Flywheel Dimensions can be measured in a combination of different ways, including: drive ring pilot, bolt circle, housing face to flywheel, pilot bearing bore, bolt circle diameter, quantity, and hole-to-hole measurements.
- Start by counting the number of tapped holes on the flywheel and measuring the diameter of the hole (dimension G).
- Measure the distance from the center of one tapped hole to another. This measurement will provide the Hole-to-Hole measurement.
- Measure the pilot diameter in the flywheel (dimension D).
Use the chart as a guide to determine what SAE Flywheel you have. Contact a WPT Sales Representative or Applications Engineer for further assistance.