129-TOOTH STARTER GEAR FOR JOHN DEERE R28811

The 129-tooth starter ring gear R28811 is a drive component mounted on the flywheel. It is designed for use in many John Deere applications listed in the compatibility chart. To identify it correctly, first check the number of teeth and the diameter (Ø 415/386 mm)—two essential specifications to verify before replacement.

Function of the Starter Ring Gear

This part is part of the engine starting system. When the starter motor engages, the pinion meshes with the ring gear to initiate rotation of the flywheel. For this type of part, proper tooth profile is essential to ensure proper meshing for the intended application.

Useful identifiers for recognizing part number R28811

This part is identified by its 129 teeth and its dimensions of Ø 415/386 mm. These specifications are crucial for avoiding confusion with a ring gear that looks similar. If you are replacing a worn part, note the part number on your old part whenever possible.

Checks to Perform Before Selecting This Ring Gear

• Check the exact number of teeth: 129;
• verify the dimensions Ø 415/386 mm;
• confirm the complete model designation of the John Deere tractor;
• take into account engine variants or serial numbers when they are specified.

The application list includes many John Deere models, some of which have specific distinctions based on version, engine, country, or serial number range. Therefore, a simple match of the model number is not always sufficient to confirm compatibility.

Before ordering, compare your part numbers and exact model with the compatibility information detailed below to select the correct starter ring gear.

Dimensions and Technical Specifications

• Ø 415/386 mm

Compatibility by Brand and Series

JOHN DEERE · 10 Series

• 4010

JOHN DEERE · 20 Series

• 3020
• 4000
• 4020
• 4320
• 4520
• 4620
• 7020

JOHN DEERE · 30 Series

• 4030
• 4230
• 4430
• 4630

JOHN DEERE · 3010 Series

• 3010
• 3210 (4045D)
• 3210X (4045D)
• 3310 (Powertech)
• 3310X (Powertech)
• 3410 (4045T)
• 3410X (4045T)

JOHN DEERE · 40 Series

• 4040 (Europe)
• 4040 (USA)
• 4040S
• 4240 (Europe)
• 4240 (USA)
• 4240S
• 4440 (Europe)
• 4440 (USA)
• 4640
• 4840
• 8440

JOHN DEERE · 50 Series

• 4050 (6359T)
• 4050 (6466D)
• 4050E
• 4250
• 4350
• 4450
• 4650
• 4850
• 8450

JOHN DEERE · 55 Series

• 4055
• 4255
• 4455 (MEX-6076T)
• 4455 (MEX-6466T)
• 4455 (USA)
• 4555
• 4755
• 4955

JOHN DEERE · 60 Series

• 4560
• 4760
• 4960

JOHN DEERE · 6000 Series

• 6506
• 6600
• 6800
• 6900

JOHN DEERE · 6003 Series

• 6403 (Mexico)
• 6403 (USA)
• 6603 (Mexico)
• 6603 (USA)

JOHN DEERE · 6005 Series

• 6225
• 6325
• 6425 (Europe)
• 6505
• 6515 (6068D) (-> 799999)
• 6515 (6068H) (800000 -> )
• 6605 (Brazil)
• 6605 (USA)
• 6615 (Brazil)
• 6615 (USA)
• 6715 (6068H) (800,000 -> )
• 6715 (6068T) (-> 799999)

JOHN DEERE · 6010 Series

• 6510
• 6510SE
• 6610
• 6610SE
• 6810
• 6910
• 6910S

JOHN DEERE · 6020 Series

• 6520 (6068D) (-> 799999)
• 6520 (6068H) (800,000 -> )
• 6520 (6068T) (-> 799999 )
• 6520SE (6068D) (-> 799999)
• 6520SE (6068H) (800,000 -> )
• 6520SE (6068T) (-> 799999)
• 6620 (6068H)
• 6620 (6068T) (-> 799999 )
• 6620 SE (6068H) (800000 -> )
• 6620 SE (6068T) (-> 799,999 )
• 6820
• 6920
• 6920S
• 6920SE

JOHN DEERE · 6030 Series

• 6130
• 6230 (Europe)
• 6230 (USA)
• 6230PR (Europe)
• 6230PR (USA-Powertech E)
• 6230PR (USA-Powertech Plus)
• 6330 (Europe)
• 6330 (USA)
• 6330PR (Europe)
• 6330PR (USA-Powertech E)
• 6330PR (USA-Powertech Plus)
• 6430 (Europe)
• 6430 (USA)
• 6430PR (Europe)
• 6430PR (USA-Powertech E)
• 6430PR (USA-Powertech Plus)
• 6530PR
• 6630PR
• 6830PR
• 6930PR

JOHN DEERE · 7000 Series

• 7200
• 7400 (-> 001336 )
• 7500 (Powertech) (001337 -> )
• 7500 (Std) (-> 001336)
• 7600
• 7700
• 7800

JOHN DEERE · 7005 Series

• 7405 (001337 -> )
• 7425
• 7505
• 7515
• 7525
• 7815

JOHN DEERE · 7010 Series

• 7210 (001337 -> )
• 7410 (001337 -> )
• 7510
• 7610
• 7710 (6081H) (090000 -> )
• 7710 (6081T) (-> 089999 )
• 7810 (Brazil)
• 7810 (USA - 6081T) (-> 089999 )
• 7810 (USA - 6081H) (090000 -> )

JOHN DEERE · 7020 Series

• 7220 (6068H)
• 7220 (6068T)
• 7320 (6068H)
• 7320 (6068T) (001337 -> )
• 7420 (Mexico) (001337 -> )
• 7420 (USA-6068H)
• 7520 (Mexico)
• 7520 (USA-6068H)
• 7520 (USA-6068T)
• 7720
• 7820 (Europe)
• 7820 (USA)
• 7920

JOHN DEERE · 7030 Series

• 7330
• 7330PR (6068H)
• 7330PR (6068T)
• 7430PR (USA-Powertech E)
• 7430PR (USA-Powertech Plus)
• 7530PR
• 7630
• 7730
• 7830

JOHN DEERE · 8000 Series

• 8100 (6076H) (-> 009999)
• 8100 (6081H) (010000 -> )
• 8100T
• 8200 (6076H) (-> 009999)
• 8200 (6081H) (010000 -> )
• 8200T
• 8300 (6076H) (-> 009999 )
• 8300 (6081H) (010000 -> )
• 8300T
• 8400
• 8400T

JOHN DEERE · 8010 Series

• 8110
• 8110T
• 8210
• 8210T
• 8310T
• 8410
• 8410T

JOHN DEERE · 8020 Series

• 8120
• 8120T
• 8220
• 8220T
• 8320
• 8320T
• 8420
• 8420T
• 8520
• 8520T

JOHN DEERE · 8030 Series

• 8130
• 8230
• 8230T
• 8330
• 8330T
• 8430

JOHN DEERE · 8060-8070 Series

• 8560
• 8570

JOHN DEERE · 9000 Series

• 9100
• 9120

FAQ — Frequently Asked Questions

What is the purpose of a starter ring gear on the flywheel?

A starter ring gear transmits the starter’s motion to the engine during startup. It is mounted on the flywheel and must have the correct number of teeth to mesh properly with the starter pinion specified for the particular application.

How do you identify the R28811 starter ring gear?

It is identified primarily by its key features: 129 teeth and dimensions of Ø 415/386 mm. It is recommended to compare these details with the old ring gear and to also verify the exact tractor model designation, as several variants exist depending on the model.

Does this part number fit all John Deere tractors in the same series?

No, not automatically. Within compatible series, certain applications also depend on the engine variant, country of destination, or serial number range. You must therefore refer to the complete model designation as it appears in the compatibility list.

Why is it necessary to check engine variants and serial numbers before ordering?

Because several John Deere models on the list are distinguished by engine type or serial number range, such as certain versions of the 6515, 6520, 6620, 7710, or 7810. This check prevents confusion between two similar but non-interchangeable assemblies.

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