Kubota GR2120

Browse aftermarket replacement parts for the Kubota GR2120 garden tractor. Kubota GR Series 21 HP diesel garden tractor with 54-inch mower deck and 4WD, the workhorse residential and small-property mowing tractor in the Kubota lineup.

Use filters or search by OEM part number to find the right part. Compatibility details are listed on each product page.

Parts Compatible with the Kubota GR2120 Garden Tractor

The GR2120 is a 21 horsepower diesel garden tractor in Kubota's GR Series, designed for residential property mowing and light garden tractor utility work. It uses the Kubota D902 era 3-cylinder diesel engine with hydrostatic transmission and 4WD, paired with a 54-inch mid-mount mower deck. The GR2120-2 designation indicates the gen-2 refresh of the same physical machine, with updated electrical and minor operator control changes. Customers commonly find GR2120 units in residential lawn maintenance applications where the diesel engine and 4WD provide superior mowing performance over gasoline lawn tractor alternatives.

The GR2120 shares many service parts with the GR2110 (the 19 HP sibling) and with other D902 era Kubota equipment because Kubota engineered the GR Series on a shared parts platform with the D902 engine family.

Common Replacement Parts for the Kubota GR2120

Engine service uses Engine Oil Filter HH150-32430 and Fuel Filter 12581-43012 as the primary engine service items for the D902 engine. Cooling system service uses Thermostat 19434-73010 as the most commonly ordered cooling service item.

Internal engine service uses Glow Plug 16851-65510 (original cold start service), Glow Plug 1G679-65512 (later revision), Gear Ring 16871-63820 (the flywheel ring gear), and Guide Oil Gauge 17456-36420. Top-end work uses Exhaust Manifold Gasket 15862-12350. Many of these internal engine parts cross to the GR2110 (the smaller GR sibling), GR2100, GR2120B, and other Kubota equipment powered by the same era D902 engine family.