Iseki TK21–TK33, TK532 & TK538 specifications: all technical data
Looking for the Iseki TK specifications? Below you'll find all the technical data for the complete TK series, taken directly from the original Iseki manuals for both the Japanese and European versions. Handy when ordering parts, adjusting your machine, or comparing models before purchase.
Suitable for the entire series: Iseki TK21, TK25, TK29, TK33 (Japanese) and Iseki TK527, TK532, TK538 (European). The 4-cylinder sister model TK546 is covered separately.
Iseki TK engines: the E3 family
| Model | Engine code | Cylinders | Displacement | Bore × stroke | Power | Speed |
|---|---|---|---|---|---|---|
| TK21 | E3CE-B08 | 3 | 1429 cc | — × 84 mm | 21 hp (15.4 kW) | 2500 rpm |
| TK25 | E3CF-B01 | 3 | 1463 cc | 86 × 84 mm | 25 hp (18.4 kW) | 2500 rpm |
| TK527 | E3CF-B06 | 3 | 1463 cc | 86 × 84 mm | 27 hp | 2500 rpm |
| TK29 | E3CD-B06 | 3 | 1498 cc | 87 × 84 mm | 29 hp (21.3 kW) | 2600 rpm |
| TK532 | E3CD-B10 | 3 | 1498 cc | 87 × 84 mm | 32 hp | 2600 rpm |
| TK33 | E3CD-B05 | 3 | 1498 cc | 87 × 84 mm | 33 hp (24.3 kW) | 2800 rpm |
| TK538 | E3CD-TB (turbo) | 3 | 1498 cc | 87 × 84 mm | 38 hp | 2600 rpm |
| TK546 | E4CG-B07 | 4 | 2197 cc | 87 × 92.4 mm | 46 hp | 2600 rpm |
All engines are water-cooled four-stroke diesel engines with indirect injection and overhead valves. Firing order 3-cylinder: 1-3-2. Compression ratio: 21.5:1 (E3CF) and 21.8:1 (E3CD). Valve clearance (cold, intake and exhaust): 0.35 mm. Cold start via glow plugs. Note when ordering parts: the E3CF (86 mm bore) and E3CD (87 mm bore) look similar, but pistons, piston rings, and head gaskets are not interchangeable. The turbo (E3CD-TB) also has its own injectors.
Idle speed (European series): TK527 and TK532 980–1020 rpm, TK538 1000–1050 rpm. Maximum no-load: TK527 2650–2750, TK532 2760–2860, TK538 2920–2940 rpm.
Estimated PTO power (European series): TK527 22.5 hp, TK532 26.1 hp, TK538 31 hp.
Iseki TK21–TK33 dimensions and weights (Japanese series)
| TK21F | TK25F | TK29F | TK33F | |
|---|---|---|---|---|
| Length | 2880 mm | 2990 mm | 2990 mm | 3070 mm |
| Width | 1300 mm | 1320 mm | 1350 mm | 1430 mm |
| Height | 1890 mm | 1920 mm | 1970 mm | 1995 mm |
| Wheelbase | 1565 mm | 1640 mm | 1640 mm | 1730 mm |
| Ground clearance | 270 mm | 300 mm | 330 mm | 350 mm |
| Weight (ROPS) | 1135 kg | 1190 kg | 1270 kg | 1285 kg |
| Weight (cab) | — | 1340 kg | 1410 kg | 1445 kg |
| Turning radius | 1.9 m | 2.1 m | 2.2 m | 2.2 m |
| Fuel tank capacity | 21 L | 30 L | 30 L | 30 L |
The Japanese series also had factory variants: the TK25F-06 (larger tires), TK25F-T (narrow track), TK33F-04 (flat lawn tires), and TK33F-H09 (extra-wide low-pressure tires 320/60-26). Check the nameplate for the exact version.
Iseki TK527–TK538 dimensions and weights (European series)
| TK527F | TK532F | TK538F | |
|---|---|---|---|
| Length | 2935 mm | 3050 mm | 3070 mm |
| Minimum width | 1310 mm | 1355 mm | 1355 mm |
| Steering wheel height | 1460 mm | 1480 mm | 1480 mm |
| Wheelbase | 1640 mm | 1725 mm | 1725 mm |
| Ground clearance | 300 mm | 310 mm | 310 mm |
| Weight (unfueled) | 1125 kg | 1170–1200 kg | 1180–1215 kg |
| Turning radius (with brake) | 2.1 m | 2.1 m | 2.1 m |
| Fuel tank capacity | 30 L | 30 L | 30 L |
Weights vary by transmission version (mechanical shuttle, power shuttle, or HST on the TK538FH). Maximum axle load European series: front axle 1300 kg, rear axle 1500 kg.
Iseki TK transmission and travel speeds
All models have 16 forward and 16 reverse gears: 4 synchronized main gears × 4 ranges (creep, low, medium, high), with a shuttle for forward/reverse. Travel speeds range from ±0.4 km/h in the creep range to ±15 km/h (Japanese series) or ±25 km/h (European TK532/TK538; TK527 ±22 km/h). The European series was available with a power shuttle (electro-hydraulic direction reversal without clutching); the TK538FH has a hydrostatic transmission with 3 ranges (up to ±25 km/h). Clutch: dry single plate — Ø225 mm (TK21–TK33, TK527, TK532), Ø240 mm (TK538), Ø260 mm (TK546). Brakes: mechanically operated wet disc brakes. Steering: hydraulic power steering.
Iseki TK PTO speeds
Japanese series (PTO shaft speed at rated engine speed):
| PTO setting | TK21F / TK25F | TK29F | TK33F |
|---|---|---|---|
| 1 (tiller) | 565 | 573 | 565 |
| 2 (tiller) | 824 | 833 | 821 |
| 3 | 1060 | 1069 | 1053 |
| 4 | 1244 | 1252 | 1233 |
| Reverse (1) | 492 | 499 | 509 |
European series: independent PTO with hydraulically operated multi-plate wet clutch, 540 rpm at ±2390–2430 engine rpm and 1000 rpm at ±2430–2475 engine rpm. A mid-PTO (35 mm, 6 splines) was available as an accessory. The PTO shaft is a 35 mm shaft with 6 splines across the entire series.
Iseki TK hydraulics and lift
Category 1 three-point hitch with position control; on the European series, draft control via the top link was optional. Key data from the European manual: main pump 22.8–23.7 L/min with relief valve at 150 bar, separate steering pump 12.1–12.5 L/min (132 bar), lift capacity 1300 kg measured at the ball ends. More explanation and practical lift capacity can be found in Iseki TK rear hitch, PTO & hydraulics.
Iseki TK electrical system
12 volt, negative ground. Battery Japanese series: 12V 55Ah (size 80D-26R or equivalent). European series: 582 CCA. Charging current via alternator with built-in regulator: 40 A. Headlights 12V 45/45W. Fuses: blade fuses 5/10/15 A plus slow-blow main fuses.
Iseki TK tires and tire pressure
Standard sizes and pressures (Japanese manual, kgf/cm²; 1 kgf/cm² ≈ 0.98 bar):
| Model | Front | Pressure | Rear | Pressure |
|---|---|---|---|---|
| TK21F | 6-14 | 2.0 | 8.3-24 | 1.6 |
| TK25F | 7-14 | 1.8 | 9.5-24 | 1.4 |
| TK25F-06 | 7-16 | 1.8 | 11.2-24 | 1.2 |
| TK29F | 7-16 | 1.8 | 12.4-24 | 1.2 |
| TK33F | 8-16 | 1.6 | 12.4-26 | 1.2 |
| TK33F-H09 | 7-14 | 1.8 | 320/60-26 | 1.0 |
European series standard (agricultural tread): TK527 front 7-14, rear 11.4-24; TK532 and TK538 front 7-16, rear 12.4-24. Lawn tires were a factory option. With tractor tires, too much air is just as harmful as too little: stick to the table.
Iseki TK Japanese vs European: differences in brief
The Japanese and European models share the same engine family, transmission, lift, and PTO. The European series has longer final drive ratios (higher top speed), optional power shuttle/HST and draft control, and European lighting and type approval. The full story, including which Japanese model corresponds to which European model, can be found in the Iseki TK buying guide.
Product tip: order parts by engine code
- Filter set Iseki TK21 – TK33 | TK527 – TK538 (SKU-10081) — fits the entire series.
- Piston Iseki E3CD | E3CD-T (SKU-100052) — for TK29, TK33, TK532, and TK538.
- Piston Iseki E3CF (SKU-100054) — for TK25 and TK527 (86 mm bore!).
- Crankshaft oil seal E3CD | E3CE (SKU-96087) — fits the entire engine family.
