PTO ADAPTER FOR JOHN DEERE 1'' 3/8 Z21

The T28672 PTO coupling is a coupling part designed for the John Deere tractors listed in this data sheet. It corresponds to a 1,000 RPM PTO configuration with a 1 3/8" size. To identify it correctly, three key features are essential: 16 internal splines, 21 external splines, and a length of 290 mm.

Role of the Coupling End Cap on the PTO

This part is installed at the tractor’s power take-off (PTO). Its primary function is to provide the mechanical connection between the PTO output and the drive shaft of the implement designed for this standard. In this type of application, the correct spline profile and length are essential to ensure a proper fit with the existing equipment.

A PTO adapter is identified primarily by its interfaces, not solely by the tractor series designation. This is why the rotational speed, the number of splines, and the overall dimensions must be considered together.

Technical specifications to verify before ordering

This part number is specified for a speed of 1,000 rpm. It features 16 internal splines, which facilitate coupling on the mounting side, as well as 21 external splines on the output side. The listed length is 290 mm, a dimension that helps distinguish this version from other visually similar couplers.

The “1'' 3/8” marking completes the output identification. To avoid errors, compare these details with the part being replaced and with the specifications of your power take-off. A single difference in speed, length, or spline profile is sufficient to indicate that a different version is required.

John Deere Application Specified

This adapter is designed for John Deere tractors in several series, with a detailed list of applications provided in the product sheet. The models in question belong to the 20, 30, 35, 40, and 50 series listed below. This information allows you to verify your specific tractor model without having to consider compatibility with an entire product line.

Part number T28672 serves as an additional reference to help you determine if this part meets your needs, in addition to visual and dimensional checks.

When to Replace This PTO Shaft End

Replacement may be necessary when the splines are worn, marked, or rounded, or when the transmission coupling no longer engages properly. On a PTO, advanced wear eventually causes the connection to become loose and makes it difficult to use the attached implement.

If you’re looking for this part, be sure to note the most reliable specifications: 1,000 rpm, 1 '' 3/8, 16 internal splines, 21 external splines, and 290 mm. If in doubt, check this information directly on the part currently installed before confirming your selection.

Dimensions and Technical Specifications

• 290 mm

Compatibility by brand and series

Series 20

• 3120

Series 30

• 3030
• 3130 (DE)
• 3130 (ES)

35 Series

• 3135

40 Series

• 3040
• 3140 (DE)
• 3140 (ES)
• 3340

50 Series

• 3050
• 3150 (ES)
• 3150 (USA)
• 3350 (DE)
• 3350 (ES-6359D)
• 3350 (ES-6359T)
• 3650

FAQ — Frequently Asked Questions

Is this PTO adapter designed for a 1,000 RPM PTO?

Yes, this part number is specified for a 1,000 rpm PTO. It also features a 1'' 3/8 size, 16 internal splines, and 21 external splines; please verify these specifications on your existing part before ordering.

What do the 16 internal splines and 21 external splines correspond to?

These values are used to identify the interfaces of the PTO end cap. The internal splines relate to the mounting-side coupling, while the external splines correspond to the output side. This combination is just as important a selection criterion as the 290 mm length.

Is part number T28672 compatible with all John Deere models in the 20, 30, 35, 40, and 50 Series?

No, it does not cover an entire series in the broad sense. It applies only to the John Deere models explicitly listed in the data sheet, such as 3120, 3030, 3130 (DE), 3140 (ES), 3350 (ES-6359T), or 3650, as per the complete application list.

Why must the 290 mm length be verified before selecting the adapter?

The 290 mm length is one of the key dimensions used to distinguish one PTO end cap version from another. Even with the same PTO speed or nominal diameter, a different length may prevent proper installation or alter the expected coupling.

Original replacement part numbers and brand names are provided for comparison purposes only. This does not imply that these are original parts.