The Watanabe THOR range in Korea comprises four machines that share a common name but serve fundamentally different applications. Korean buyers encountering the range for the first time sometimes treat the four models as a size progression — “small, medium, large, and specialist” — but this framing leads to incorrect choices. The four models are not a size ladder; they are four purpose-built machines for four distinct operational categories. Choosing the correct THOR requires understanding what makes each model distinct — not just comparing horsepower and working width.
This guide presents all four models together, explains the single most important characteristic that distinguishes each one, and provides a practical decision framework built around Korean applications, terrain types, and tractor configurations.
All Four Models — Complete Specifications at a Glance
| Specification | THOR 2.4 | THOR 3.0 | THOR FLM | THOR ST |
|---|---|---|---|---|
| Min. tractor HP | 180 HP | 230 HP | CVT req. | 250 CV CVT |
| Working width | 2.4 m | 3.0 m | Forestry spec | 2,200 mm |
| Machine weight | 2,300 Kg | 2,800 Kg | Forestry spec | 5,300 Kg |
| Max. stone/material | 30 cm stones | 40 cm stones | Rock + stump | 0–200 mm milling |
| PTO | 1000 RPM | 1000 RPM | 1000 RPM | 1000 RPM |
| Slope tool | Kit Drawbar — included | Drawbar Kit — included | CVT gives control | Flat road focus |
| Primary Korean use | Agriculture + roads + orchards | Large open farmland | Silviculture + 임도 | Rural road FDR |
All specifications from the Watanabe official product brochure.
Each Model in Detail — The One Thing That Makes It Different
180 HP · 2.4 m · 2,300 Kg · 90+6 teeth · Kit Drawbar included
The one thing that makes it different: Kit Drawbar pull-mode is standard, not optional — the only Korean market stone crusher that includes slope capability as standard.
The THOR 2.4 is the most versatile Korean market stone crusher and the highest-volume seller in the range. 180 HP minimum makes it compatible with the largest class of Korean commercial farm tractors. 2.4 m working width accesses most Korean highland terrace, orchard, and farm road widths. The Kit Drawbar — a full pull-mode conversion system that redistributes machine weight from rear-cantilever to tractor-centreline drawbar tow — is included with every THOR 2.4 delivered from Korea Watanabe. This slope capability as standard is the reason the THOR 2.4 dominates Korean highland potato, ginseng, orchard, and mountain farm road applications where terrain gradients above 20% are routine.
인삼
과수원
농로
고랭지배추
경사지 all
230 HP · 3.0 m · 2,800 Kg · 108+8 teeth · 40 cm max stone · Drawbar Kit
The one thing that makes it different: larger stone capacity and higher throughput — 40 cm max stone vs 30 cm, and 3.0 m width covers 25% more area per pass than the THOR 2.4.
The THOR 3.0 is the high-throughput choice for large-scale Korean operations — land clearing contractors, large agricultural operations above 30 ha, and government-contracted land development projects where maximum daily coverage area is the operational priority. 230 HP minimum limits it to the largest Korean farm tractors (the same CVT-capable tractor class required for the THOR ST). The 40 cm maximum stone size means it handles boulders that the THOR 2.4’s 30 cm limit cannot address. The Drawbar Kit provides the same slope management capability as the THOR 2.4’s Kit Drawbar — but the THOR 3.0’s larger 2,800 Kg weight and 230 HP tractor requirement may make it inappropriate for some narrower highland terrace operations where the THOR 2.4 is the better fit despite the lower per-pass throughput.
토지 개발
대형 농로
평탄지 대면적
THOR FLM
CVT mandatory · 1000 RPM · Forestry rotor · Stump + rock
The one thing that makes it different: it processes stumps and root systems that the agricultural THOR models cannot handle reliably, because it requires CVT operation at near-zero forward speed to manage stump engagement.
The THOR FLM is not a stronger version of the THOR 2.4 — it is a purpose-built silviculture and forestry machine with a modified rotor configuration for processing mixed stump, root network, and surface rock in forestry clearing contexts. CVT tractor operation is mandatory: the very low forward speed (0.2–0.5 km/h at stump approach) that protects the rotor and transmission from shock loading during dense material engagement cannot be achieved with a conventional-transmission tractor. Korean applications: Korea Forest Service (산림청) plantation management contracts, 임도 (forest road) construction, post-harvest plantation floor preparation, private plantation management between crop rotations.
산림 정비
조림지 정리
CVT 트랙터 보유
THOR ST
250 CV CVT · 5,300 Kg · 92 Kennametal RK4 bits · 0–200 mm milling · Road stabilization
The one thing that makes it different: it is not a stone crusher — it is a road soil stabilizer that mills existing road material and incorporates binder (cement/lime) for full-depth reclamation of failed road bases. It does not collect or remove stone.
The THOR ST is frequently compared to the agricultural THOR models by Korean buyers because of the shared name and the visual similarity of the rotor system. But the THOR ST is a road rehabilitation machine — the 92 Kennametal RK4 bits are optimised for milling compacted road base material, not for fracturing discrete stone boulders. The machine requires simultaneous water truck and DCW 2.2 binder spreader operation; it produces stabilized road base material rather than collected stone. Korean applications: 농어촌도로 rural road rehabilitation, 임도 base stabilization, land development access road construction where FDR is preferable to conventional reconstruction.
FDR 토양 안정화
CVT 트랙터 필수
The Korean Application Decision Matrix
| Your Korean Application | THOR 2.4 | THOR 3.0 | THOR FLM | THOR ST |
|---|---|---|---|---|
| 고랭지감자 / 고랭지배추 (slope >15%) | ★★★ | ★ | — | — |
| 인삼 / 당귀 약초 seedbed | ★★★ | ★★ | — | — |
| 사과 / 배 / 감 orchard clearing | ★★★ | ★ | — | — |
| Mountain farm access road building | ★★★ | ★★ | — | — |
| Large open farmland (>25 ha, flat) | ★★ | ★★★ | — | — |
| 제주도 basalt (Jeju Island) | ★★★ | ★★ | — | — |
| 산림 / 임도 / silviculture (stump+rock) | ★ | ★ | ★★★ | — |
| Rural road base stabilization (FDR) | — | — | — | ★★★ |
The CVT Question — How It Filters Model Choices
The single most important filter question in Watanabe THOR selection for Korean buyers is: do you have or plan to acquire a CVT tractor?
Tractor HP Matching — Confirm Before Ordering
The THOR minimum tractor HP requirements are firm — they reflect the PTO torque input needed for the rotor to maintain rated speed under load in Korean granite and basalt conditions. Underpowered operation produces rotor slowdown, inconsistent crushing, and accelerated wear on the transmission. Korean commercial tractors in relevant HP classes:
| HP Class | Compatible THOR models | Example Korean tractor models |
|---|---|---|
| 180–229 HP | THOR 2.4 only | Kioti DK9010, LS MT9030, TYM T9050 and similar; European imports (John Deere 6R, New Holland T7) in this class |
| 230–249 HP | THOR 2.4 + THOR 3.0 | European imports: John Deere 7R 230, New Holland T7.230, Fendt 724 |
| 250+ HP CVT | All THOR models (including FLM + ST) | European CVT: Fendt 728–730 Vario, New Holland T7 AutoCommand, John Deere 7R IVT, Case IH Optum CVX 270+ |
Note on Korean domestic tractor brands
Korean domestic brands (Daedong/Kioti, LS, TYM) offer tractors up to approximately 130 HP in their current highland-capable commercial range. None of the Korean domestic brands currently offer CVT transmission in the power classes required for the THOR range. Korean THOR operators in the 180+ HP class use either imported European tractors or Korean-branded tractors in the 180+ HP range where available. Confirm your tractor’s actual HP rating from the specification plate — marketed HP and rated PTO HP can differ by 10–15% for some models.
Real Korean Operator Profiles — Which Model for Which Operation
The decision matrix above answers the question in theory. The following Korean operator profiles show how the selection plays out in practice — illustrating the specific combination of crop, terrain, tractor, and scale that leads to each THOR model choice:
Profile A — Highland Potato / Ginseng Farmer, Pyeongchang-gun (→ THOR 2.4)
12 ha total farm area. Mixed potato (8 ha Atlantic) and ginseng (4 ha, 6-year rotation). Granite highland terrain, gradients 15–25% on most field sections. 190 HP Korean domestic tractor (no CVT). The choice is clear: THOR 2.4 with Kit Drawbar. The THOR 3.0 requires 230 HP minimum and the 190 HP tractor cannot operate it. The THOR 2.4 handles both the annual potato stone clearance and the 6-year ginseng seedbed clearance on the sloped terrain where the Kit Drawbar is essential.
Profile B — Large Open Land Clearing Contractor, South Chungcheong (→ THOR 3.0)
Agricultural land clearing contractor operating on government-contracted new farmland development projects. Typical project: 30–80 ha of flat-to-gently-sloped new agricultural land from reclaimed or converted rural land. Rocks up to 40 cm are common on these project sites. 250 HP European tractor (CVT). The THOR 3.0 is the right choice: the larger 3.0 m width and 40 cm stone capacity maximises daily project coverage, and the 230 HP minimum is met by the contractor’s tractor fleet. The THOR 2.4’s 2.4 m width and 30 cm stone limit is too constrained for this scale and these stone sizes.
Profile C — KFS Forest Rehabilitation Contractor, Gangwon-do (→ THOR FLM)
Forest service contractor holding Korea Forest Service (산림청) contracts for post-harvest pine plantation rehabilitation in North Gangwon-do. Work involves post-harvest stump processing (stumps 15–40 cm diameter), surface rock clearing on 임도 alignments, and forest floor preparation for replanting. 270 HP Fendt 726 Vario (CVT). The THOR FLM is the only machine that can process the plantation stumps the KFS contract requires — its CVT operation at near-zero forward speed and forestry rotor specification are both necessary for this stump density. The THOR 2.4 cannot reliably process 30–40 cm diameter stumps, and the THOR 3.0 without CVT cannot operate at the required stump-approach speed.
Profile D — County Road Authority, North Jeolla (→ THOR ST)
County-contracted rural road rehabilitation across 15 km of 농어촌도로 sections. Road condition: granular base has structurally failed after 15 years of service, producing rutting, settlement, and drainage failure. No significant surface boulders — the road base failure is a structural/drainage issue, not a stone accumulation issue. 260 HP New Holland T7 AutoCommand (CVT). The THOR ST is the correct machine: it mills the existing failed base and incorporates cement binder to create a chemically stabilized new base layer — exactly the FDR method this road condition requires. The THOR 2.4 stone crusher would fracture existing stones but would not address the structural base failure or produce the stabilized base layer the road needs.
Frequently Asked Questions
I do both highland farm stone clearing (potato, vegetable) and some forest road construction — do I need both the THOR 2.4 and the THOR FLM?
It depends on the nature of your forest road construction work. If your 임도 work involves surface rock and vegetation clearing on rocky mountain alignments without significant stump processing — using the crushed aggregate in-place as road base — the THOR 2.4 in Kit Drawbar mode handles this work alongside your agricultural stone clearing. The THOR FLM’s specific advantage (CVT slow-speed stump processing) is only needed when a significant proportion of your 임도 work involves processing timber stumps and root networks as part of the cleared alignment. Operators who primarily do 임도 track clearing (rock + vegetation only, no significant stumping) typically find the THOR 2.4 adequate for both farm and 임도 applications. Those who have KFS plantation management contracts with formal stump processing requirements need the THOR FLM’s capability.
Is the THOR ST a stone crusher that also stabilizes soil, or a soil stabilizer that also crushes stone?
The THOR ST is a soil stabilizer — not a stone crusher that secondarily stabilizes. This distinction matters operationally: the THOR ST’s Kennametal RK4 rotor bits are designed for high-volume milling of compacted road base material at controlled 0–200 mm depth, incorporating water and binder as they mill. They are not designed for the high-impact shock loading of individual granite boulder crushing that the agricultural THOR 2.4 handles routinely. If a rural road alignment contains large surface boulders (above 10–15 cm) before the THOR ST treatment, a pre-treatment THOR 2.4 pass is required to fracture those boulders to below the THOR ST’s milling specification before the THOR ST pass. The machines work in sequence for rocky road stabilization projects — THOR 2.4 first (rock pre-treatment), then THOR ST (base stabilization).
All four models are available for Korean agricultural subsidy programs?
The THOR 2.4 and THOR 3.0 qualify under the 토양 파쇄기 (stone crusher) category of the Korean agricultural machinery purchase support program — standard agricultural machinery subsidy. The THOR FLM may qualify under forestry machinery support programs administered through Korea Forest Service (산림청) rather than the MAFRA agricultural program. The THOR ST qualifies under different programs depending on application — agricultural program for farmland improvement applications, rural road development programs for 농어촌도로 road rehabilitation. Confirm the specific program category applicable to your intended use with your regional agricultural technology center or the relevant rural road authority. Korea Watanabe provides technical documentation for subsidy applications for all THOR models.
Are all four THOR models available from Korea local stock?
The THOR 2.4 and THOR 3.0 are the primary volume models maintained in Korea local stock in Ansan-si, Gyeonggi-do, with 1–3 business day delivery across Korea. The THOR FLM and THOR ST are specialist machines with lower volume demand — stock availability and delivery lead times differ from the agricultural models. Contact Korea Watanabe directly for current THOR FLM and THOR ST stock status before planning a project with a specific delivery date requirement. For THOR FLM in particular, initiate stock confirmation 8–12 weeks before the intended deployment date to allow for international supply lead times if Korean local stock is not available at the time of enquiry.
Crop + Terrain + Tractor HP + CVT? → Specific THOR Model in 3 Minutes.
Tell us your primary application (crop or road type), terrain gradient, tractor HP, and whether you have CVT — Korea Watanabe confirms which THOR model is correct for your specific Korean field conditions. THOR 2.4 and THOR 3.0 in Korea local stock, Ansan-si, Gyeonggi-do.
Editor: Cxm
