Kubota GL21 – GL23 – GL27 – What Are the Specifications?
Suitable for the entire Kubota GL series (Grandel): GL19, GL21, GL23, GL25, GL25K, GL26, GL27, GL29, GL32 and GL33, including GL23DJ and GL27DJ. Also known as the Hinomoto NX series. All values come directly from the original Kubota GL series manual.
Looking for the specifications of the Kubota GL21 or another model from the GL series? Below you'll find the complete technical data from the factory manual: engines, dimensions, weights, driving speeds, PTO speeds, and tire sizes. Handy when buying, ordering parts, and choosing implements.
Kubota GL series engine specifications
| Model | Engine | Displacement | Power | Fuel tank |
|---|---|---|---|---|
| GL19 | Kubota D1403-L | 1,393 cc | 19 hp / 2,500 rpm | 27 l |
| GL21 | Kubota D1403 | 1,393 cc | 21 hp / 2,600 rpm | 27 l |
| GL23 | Kubota D1463-L | 1,463 cc | 23 hp / 2,500 rpm | 27 l |
| GL25 / GL25K | Kubota D1463 | 1,463 cc | 25 hp / 2,600 rpm | 27 l |
| GL26 | Kubota D1503-L | 1,499 cc | 26 hp / 2,600 rpm | 27 l |
| GL27 / GL27DJ | Kubota D1503-L | 1,499 cc | 27 hp / 2,600 rpm | 27 / 35 l |
| GL29 | Kubota D1503 | 1,499 cc | 29 hp / 2,700 rpm | 35 l |
| GL32 | Kubota D1503-H | 1,499 cc | 32 hp / 2,800 rpm | 35 l |
| GL33 | Kubota D1703 | 1,647 cc | 33 hp / 2,700 rpm | 35 l |
All engines are water-cooled 3-cylinder four-stroke diesel engines with glow plug preheating and starter motor. The battery is a 12V type 75D26R (maintenance-free). Note the difference between the engines: the GL19 and GL21 have the 1.4-liter D1403, the GL23 and GL25 the 1.46-liter D1463 with a larger bore, and the GL26 through GL32 the 1.5-liter D1503. Head and engine gaskets between these engines are therefore not interchangeable.
Kubota GL21 dimensions and weights
| Model | L x W x H (mm) | Wheelbase | Ground clearance | Weight |
|---|---|---|---|---|
| GL19 | 2,950 x 1,250 x 1,440 | 1,550 mm | 335 mm | 1,020 kg |
| GL21 | 2,950 x 1,275 x 1,440 | 1,550 mm | 335 mm | 1,040 kg |
| GL23 | 2,950 x 1,275 x 1,450 | 1,550 mm | 350 mm | 1,060 kg |
| GL25 | 3,050 x 1,350 x 1,455 | 1,645 mm | 345 mm | 1,130 kg |
| GL26 | 3,050 x 1,350 x 1,945* | 1,645 mm | 345 mm | 1,200 kg |
| GL27 | 3,050 x 1,420 x 1,475 | 1,645 mm | 360 mm | 1,150 kg |
| GL29 | 3,180 x 1,420 x 1,475 | 1,750 mm | 360 mm | 1,190 kg |
| GL32 | 3,180 x 1,455 x 1,475 | 1,750 mm | 360 mm | 1,210 kg |
| GL33 | 3,180 x 1,455 x 1,985* | 1,750 mm | 360 mm | 1,290 kg |
* Height including standard safety frame. The GL25K is the narrow version: 2,955 x 1,290 x 1,295 mm, 1,050 kg, ground clearance 270 mm, and a turning radius of just 2.0 m.
Kubota GL21 transmission and driving speeds
All models have a shuttle transmission with 16 gears forward and 16 reverse (main gear lever, range lever, and creep gear), available as constant-mesh or U-shift version. The GL21 runs forward from 0.23 to 14.81 km/h and reverse from 0.20 to 13.33 km/h. With the creep gears you can go well below 0.5 km/h – ideal for tilling, digging, and planting. The GL26 and GL33, due to a different final drive ratio, reach speeds of over 23 km/h. The turning radius with steering brake is 1.9 m (GL19–GL23), 2.1 m (GL25–GL27), or 2.2 m (GL29–GL33).
Kubota GL series PTO and hydraulics
The rear PTO is a JIS 35 mm shaft with 6 splines. The GL21 runs at 568, 803, 985, and 1,304 rpm at rated engine speed (2,600 rpm); the X version also has a reversible PTO (803 rpm). The lift system operates with position control (and on M/MA versions, Monroematic automatic depth control) and has a category 1 (JIS) three-point hitch. More on this in the blog about hydraulics, PTO, and implements.
Tires and tire pressure
Standard tire sizes: GL19 6-14 front / 8.3-24 rear, GL21 6-14 / 9.5-22, GL23 6-14 / 9.5-24, GL25 and GL26 7-16 / 11.2-24, GL27 8-16 / 11.2-26, GL29 8-16 / 12.4-24, GL32 and GL33 8-16 / 13.6-24. The rear track width is adjustable in 5 or 6 positions on most models. Tire pressure according to the manual: 1.6 kgf/cm² front (2.0 with front loader) and 1.0 kgf/cm² rear.
