John Deere AM31568 lawn mower starter motor | 12V 10-tooth | single-cylinder air-cooled

12V replacement starter motor reference for classic John Deere garden tractors. John Deere identifies AM31568 as a starter motor, and parts catalogs cross-reference it to further John Deere numbers (AM32789 / AM34248 and others) and to Kohler 45-098-xx starter numbers for Kohler K-series single-cylinder engines.

OEM and Search References

• Primary reference: AM31568 (John Deere)
• Substitute reference: John Deere AM32789 / AM34248 / AM3424B / AM34888 / AM37032 / AM37869 / AM119837; Kohler 45-098-01 / 45-098-03 / 45-098-05 / 45-098-07 / 45-098-09 / 51-098-01 / A237510 / A237534; Lester 5761; United Tech 0594424 / 0599440 / SM05994 / SM56661; Massey Ferguson 1042-653-M92
• Equipment reference: John Deere classic garden tractors 110 / 112 / 120 / 140 (1968–1974), 210 / 212 / 214 / 216 (1975–1987), 300 / 312 / 314 / 316; John Deere 60 loader (1977–1984); paired with Kohler K241 / K301 / K341 single-cylinder air-cooled 10–16HP engines; also fits Toro Greensmaster 300.
• Buyer search terms: John Deere AM31568 starter motor, AM31568 starter, Kohler K301 starter, Kohler K341 starter motor, 10 tooth starter, John Deere 210 starter, John Deere 316 starter, vintage garden tractor replacement parts.

Reference Specifications

• System voltage: 12V, as stated in the product title.
• Power: 0.6 kW, reported by compatible replacement listings cross-referenced to AM31568.
• Pinion: 10 teeth, reported by compatible replacement listings cross-referenced to AM31568.
• Pinion outer diameter: 32.2 mm (1.268 in); mounting: three 9.6 mm plain holes; field shell length: 87.6 mm; type: PMDD permanent-magnet direct drive, approx. 2.5 kg.
• Rotation: counterclockwise (CCW, viewed from the pinion end), reported by compatible replacement listings cross-referenced to AM31568.
• These pinion, rotation, and mounting details are not confirmed John Deere factory specifications. Match them against the removed unit before ordering.

Fitment and Purchase Checks

• Catalog-listed equipment: John Deere 110–316 series garden tractors and Kohler K-series engines listed above. Confirm tractor serial number, engine configuration (Kohler K241 / K301 / K341), existing starter number, voltage, pinion tooth count, rotation, mounting pattern (three-hole), terminal layout, and physical dimensions before purchase. Exact AM31568 length, width, and height have not been verified and are omitted.

For Agricultural Buyers and Distributors

• This listing is organized for farm equipment procurement teams, repair shops, and tractor-parts distributors searching by equipment model and OEM reference. The same unit serves both the discontinued John Deere vintage tractor market and the Kohler K-series engine market, making it a high-frequency demand item for in-service and collector machines. For quotation, specify the tractor serial number, engine details, old-part number, required quantity, and destination. Confirm price, stock, package quantity, and delivery terms with the seller before placing a purchase order.

Product Positioning

John Deere 110 through 316 garden tractors and the Kohler K241 / K301 / K341 engines inside them have been out of production for decades, yet thousands are still mowing, hauling and pulling at shows every season. For these machines the starter is a make-or-break part: the original units are fifty years old, and NOS or used replacements are scarce and expensive. This starter reproduces the original 10-tooth pinion, three-hole mounting pattern and terminal position exactly, so a workshop replaces the aging unit as a whole instead of rebuilding worn fields and armatures. For parts distributors, it serves both the working vintage-tractor market and the collector market - high-frequency demand on machines that owners refuse to let die.

How It Works: Power and Engagement

The unit is a permanent-magnet direct-drive (PMDD) design: a copper-wound armature spins inside a ring of ferrite magnets, and the 10-tooth pinion is fixed directly to the armature shaft, so cranking response is immediate when current flows. Turning the key energizes the solenoid first, sliding the pinion into mesh with the flywheel ring gear before the main contacts close and apply full battery voltage - the two-step sequence that prevents tooth-on-tooth grinding on old ring gears that may already show wear. Rotation is counter-clockwise viewed from the pinion end, matching the Kohler K-series flywheel. The three plain 9.6 mm mounting holes locate the pinion-to-ring-gear clearance exactly as the factory unit did, which keeps engagement quiet and complete.

Materials and Durability

• Pinion: hardened steel with a ground tooth profile, gentle on aging ring gears that can no longer tolerate sloppy engagement.
• Windings: copper wire for low resistance, important on vintage machines with original wiring and older batteries.
• Magnets: ferrite field magnets, stable at engine-bay temperatures and resistant to demagnetization.
• Brushes and commutator: sized for long service life inside a dust-tight brush holder suited to dusty barn and field storage.
• Housing: coated shell that withstands humidity in shed storage and the wash-down exposure common before shows and sales.

Problems It Solves

These tractors usually arrive at the shop with one of four complaints. First, slow, labored cranking, caused by weak field magnets or worn brushes in the original PMDD unit. Second, a grinding or slipping noise from pinion teeth that no longer mesh fully with a worn ring gear. Third, intermittent no-start from arced or contaminated commutator surfaces after years of barn storage. Fourth, a single click with no cranking from burned solenoid contacts. Replacing the complete starter clears all four in one step instead of hunting for rebuild parts that no longer exist. One caution before ordering: confirm the three-hole mounting pattern and 10-tooth pinion against the removed unit, since later Deere tractors moved to different starter families.

Replacement Value for Shops and Distributors

For repair shops, one correctly matched starter returns a working tractor - or a show tractor - to service the same day, with no drilling, tapping, or wiring changes in between. For dealers and distributors, the numbers work: 50-unit minimum order, 7-30 day lead time, 12-month warranty, and unit pricing well below NOS channels, leaving room for margin at a fair shelf price. Production follows ISO 9001, IATF 16949, and CE practices, and consistent cross-references to Kohler 45-098-05, Lester 5761, and John Deere AM32789 keep ordering by catalog number straightforward and returns low.