THOR 2.4 Rock Crusher with Kit Drawbar – 180 HP Stone Crusher Mulcher for Tractor
Tractor-mounted stone crusher mulcher for rocky farmland, orchards, and mountain access roads. Kit Drawbar included for safe slope operation above 20%. Crushes stones up to 30 cm while mulching brush in a single pass.
180 HP min · 2.4 m working width · 2,300 Kg · 90+6 carbide teeth · Korea local stock.
Korea's Most-Used Mid-Size Rock Crusher — Kit Drawbar Included Standard
The THOR 2.4 is a tractor-mounted stone crusher mulcher operating on the rear Category 2 three-point hitch, PTO-driven at 1000 RPM. At 180 HP minimum, it crushes surface stones up to 30 cm diameter and mulches brush simultaneously — leaving uniformly crushed aggregate on the field surface. The Kit Drawbar is included in the standard price, converting the machine from rear hitch mounting to a front-pull (drawbar) configuration for slope operation.
In pull-mode, the THOR 2.4 is towed in front of the rear axle rather than carried behind it. This shifts the 2,300 Kg machine weight from a position that lifts the front wheels (rear-hitch on slopes) to a position that keeps both axles pressed firmly to the ground (pull-mode on slopes). Korean mountain orchard operators working on gradients of 20–30% consistently identify the Kit Drawbar as the specific reason they chose this model. No additional cost, no separate order — it comes with every THOR 2.4.
Technical Specifications — THOR 2.4 vs THOR 3.0
All data from the Watanabe official product brochure.
| TECHNICAL DATA | THOR 2.4 | THOR 3.0 |
|---|---|---|
| Working width | 2.4 m | 3.0 m |
| Length (mm) | 1,546 | 1,732 |
| Overall width (mm) | 2,481 | 3,000 |
| Height (mm) | 1,212 | 1,212 |
| Weight | 2,300 Kg | 2,800 Kg |
| Bottom linkage category | 2 | 2 |
| Min. tractor power | 180 HP | 230 HP |
| Recommended PTO speed | 1000 RPM | 1000 RPM |
| Rotor diameter (with tools) | 550 mm | 600 mm |
| Carbide teeth | 90 main + 6 side | 108 main + 8 side |
| Max. stone diameter | up to 30 cm | up to 40 cm |
| Max. crushing depth | 250–300 mm | 300 mm |
ⓘ All specifications from the Watanabe official product brochure. 1000 RPM PTO is required — confirm your tractor's rear PTO speed. HP = horsepower.
Engineering Features
■ Kit Drawbar — Included
Switches from rear 3-point hitch to front-pull configuration. On slopes above 20%, pull-mode redistributes the machine weight to keep both axles grounded — essential for orchard and mountain farm road safety. Switch takes under 10 minutes, no tools required.
■ Oil-Cooled Transmission
Dedicated oil cooler and radiator maintain transmission temperature during sustained 180 HP operation in Korean summer heat (35°C+). Enables full working days in Jeju basalt and highland granite conditions without thermal overload stops.
■ 90+6 Carbide Teeth, All Bolt-Mounted
All teeth are individually bolt-mounted for field-level replacement without removing the rotor. Carbide tips handle Korean granite and Jeju basalt abrasion. 550 mm rotor diameter. Regularly inspect teeth during intensive clearing seasons.
■ Hydraulic Hood + Adjustable Grid
Controls output fragment size from the tractor cab — fine for seedbed preparation, coarser for road base aggregate. Adjustable output grid is wear-resistant steel, bolt-on replaceable. No need to exit the tractor to change the output setting.
How the THOR 2.4 Works — PTO Drive and Rotor Crushing Mechanism
The THOR 2.4 is a PTO-driven stone crusher: the tractor's rear power take-off shaft at 1000 RPM drives the machine's dual-stage gearbox, which transmits power to the rotor shaft. The gearbox multiplies rotor torque while maintaining the 1000 RPM rotor speed that delivers the tooth impact energy required for effective stone crushing at 180 HP input.
Rotor and Carbide Teeth — How Stones Are Crushed
The 550 mm diameter rotor carries 90 main teeth plus 6 side teeth, all carbide-tipped, arranged in a helical pattern across the full 2.4 m working width. At 1000 RPM, each tooth tip travels at approximately 28 m/s when it strikes rock — the kinetic energy of the carbide impact shatters the stone rather than pushing it aside. Stones up to 30 cm diameter are processed in a single pass. The helical tooth arrangement ensures that at any moment, multiple teeth are in simultaneous contact with the material, delivering smooth power absorption without the vibration surges that single-tooth-row arrangements produce. This smooth load distribution is particularly important on slopes where uneven torque spikes can affect tractor stability.
Output Size Control — Hydraulic Hood and Adjustable Grid
After crushing, material that has been reduced below the grid opening size passes through the adjustable rear output grid and is deposited on the field surface. The operator adjusts grid opening size hydraulically from the tractor cab — no need to stop the machine or exit the cab. Finer settings produce smaller aggregate suitable for agricultural seedbed preparation; coarser settings produce larger angular gravel appropriate for road base construction. The output grid is wear-resistant steel and bolt-on replaceable when worn.
Kit Drawbar — Front-Pull Mechanics on Slopes
In standard rear 3-point hitch configuration, the 2,300 Kg machine weight acts as a lever behind the rear axle on a slope — increasing the overturning moment that lifts the tractor's front wheels and reduces steering control. The Kit Drawbar repositions the machine connection point to the tractor's rear drawbar hook, placing the 2,300 Kg load in front of the rear axle in the machine's direction of travel. This converts the destabilising rear lever effect into a stabilising distributed load, pressing both front and rear axles onto the slope surface. The physical result: consistent steering control, better driven-wheel traction, and reduced risk of rear-end instability on gradients above 20%.
Oil Cooling System — Continuous Operation at 35°C+
At 180 HP input over an 8–10 hour working day, the gearbox generates heat that standard splash lubrication cannot adequately dissipate in Korean summer conditions (July–August ambient temperatures of 33–38°C in highland clearing zones). The THOR 2.4's dedicated oil cooling circuit — a separate oil reservoir, pump, and radiator running in parallel with the main gearbox — maintains transmission oil temperature within the optimal operating range regardless of ambient conditions. The cooling circuit operates continuously whenever the PTO is engaged and requires no operator monitoring. This is the engineering feature that distinguishes machines capable of full consecutive working days from machines that require periodic thermal recovery stops.
Applications in Korea
Mountain Orchard Establishment — Apple, Pear, Citrus
Apple orchards in Gyeongsangbuk-do (Cheongdo, Yeongcheon), pear orchards in Naju, and citrus farms on Jeju Island all require stone-cleared, level ground before sapling planting and drip irrigation installation. The THOR 2.4 in Kit Drawbar pull-mode handles the 20–30% gradients typical of Korean mountain orchard sites, crushing surface granite and basalt while mulching pruned brush — all in one pass.
Ginseng and High-Value Herb Field Preparation
Ginseng production in South Chungcheong (Geumsan-gun, Yesan-gun) requires complete stone removal for the 6-year rotation cycle. The THOR 2.4 crushes stones too large for the rock picker's 80 kg limit. The professional two-machine sequence for ginseng preparation: THOR 2.4 crusher first, then CT-2100 rock picker for complete fragment collection.
Farm Road Construction on Slopes
Using the Kit Drawbar in pull-mode, contractors build and maintain all-weather farm access roads on steep Korean mountain terrain. The THOR 2.4 crushes embedded boulders into gravel-sized material that compacts naturally into a stable road surface. No imported aggregate needed — the crushed material becomes the road base.
Pre-Planting Stone Clearance — Potato and Vegetable Crops
Annual spring stone clearance before potato planting in Gangwon-do (Pyeongchang-gun, Hoengseong-gun) and vegetable fields across South Chungcheong. The EP-EW-4000 rock rake (75 HP) is an alternative first step for lighter stone loads, raking surface stones into windrows before the CT-2100 pick-up pass without requiring the full crushing power of the THOR.
Watanabe — 50+ Years of Agricultural Machinery Manufacturing
Manufacturing and Quality Control
The THOR 2.4 is produced at Watanabe's dedicated facility in Castro, Paraná, where the full production chain — steel cutting, rotor shaft machining, frame welding, gearbox assembly, and final testing — is conducted under Watanabe's direct quality control. Frame components are welded and stress-relieved in-house. The assembled rotor undergoes balance checking before installation. Each completed machine is functionally tested before shipment. The oil-cooled dual transmission specification, carbide tooth geometry, and wear-resistant steel liner selection were all developed and validated in Watanabe's own test program on Brazilian highland granite and basalt clearing operations.
Why the THOR Design Matches Korean Conditions
Korean highland granite (Gangwon-do, North Gyeongsang) and Jeju Island basalt are mineralogically comparable to the Brazilian highland rock types for which the THOR rotor was optimised — the same hardness range (Mohs 6–7), the same abrasive silica content, and the same tendency to produce angular fragments that accelerate tooth wear in machines not designed for the rock type. Korean operating temperatures during peak summer clearing seasons (July–August, 33–38°C ambient in highland regions) match the Brazilian conditions that drove the oil-cooling circuit design. The THOR's performance record in Brazil translates directly to Korean performance expectations because the underlying conditions are comparable.
Korea Local Stock and After-Sales Support
Korea Watanabe maintains local inventory in Ansan-si, Gyeonggi-do — covering the THOR 2.4, replacement carbide tooth sets, wear-resistant steel grid sections, and other commonly needed wear items. Local stock enables delivery within the Korean agricultural season calendar rather than international shipping lead times. Replacement carbide teeth for the THOR 2.4 are dispatched next-day domestically, keeping downtime during the peak spring and autumn clearing seasons to a minimum.
Technical support is available in Korean from the Korea Watanabe team. Product commissioning, maintenance scheduling guidance, troubleshooting, and wear item ordering assistance are all available throughout the machine's service life. Warranty terms and conditions are confirmed at the time of purchase and apply to mechanical defects in the drive system, rotor assembly, and main frame structure.
Frequently Asked Questions
What does the Kit Drawbar actually do on slopes?
The Kit Drawbar converts the machine from rear three-point hitch mount to a towed position in front of the rear axle. In standard rear-hitch mode on a steep slope, the 2,300 Kg machine weight acts as a lever that lifts the front wheels, reducing steering control. In pull-mode, the machine weight presses both front and rear axles down — improving traction and stability. This is critical on the 20–30% slopes common on Korean mountain orchard sites. The switch takes under 10 minutes and requires no tools.
What happens if the machine hits a stone larger than 30 cm?
Stones above 30 cm may not be fully processed in a single pass — they receive a partial impact and may require a second pass to reduce to usable size. Very large embedded boulders (above 50 cm) should ideally be pre-broken with an excavator before the THOR 2.4 pass. If your field has a significant proportion of stones in this size range, the THOR 3.0 (40 cm maximum, 600 mm rotor) is the more appropriate model.
Which Korean tractor models are compatible?
Compatible models include: Daedong (대동) upper-range models (180 HP+), LS XR series (180 HP+), John Deere 6R series (180 HP+), New Holland T6/T7 series (180 HP+), and Kubota M7 series (upper range). Requirements: Category 2 three-point hitch, 1000 RPM rear PTO, 180 HP minimum. Provide your tractor model and year when contacting us — we confirm compatibility before any order is placed.
Is the THOR 2.4 suitable for Jeju Island basalt?
Yes. Jeju basalt is harder and more abrasive than most Korean mainland granite. The oil-cooled transmission handles sustained operation in Jeju's demanding conditions without heat-related performance loss during full working days. Carbide tooth wear rate is higher in basalt than in softer rock types — shorten your tooth inspection intervals in heavy Jeju basalt conditions compared to mainland field schedules.
Do I need a rock picker as well as the THOR 2.4?
It depends on the final land use. For farm roads and land where crushed aggregate remaining on the surface is acceptable, the THOR 2.4 alone gives a complete result. For ginseng, potato, and other crops where zero residual stone in the seedbed is required, a CT-2100 rock picker follow-up pass is necessary to collect what the crusher leaves behind. Neither machine alone achieves both goals — the crusher handles large stones the picker cannot lift; the picker removes the fragments the crusher leaves on the surface.
How do I replace the carbide teeth?
All 96 teeth (90 main + 6 side) are individually bolt-mounted. A single tooth replacement takes approximately 3–5 minutes with a standard wrench. Inspect all teeth at regular intervals during the clearing season and replace any showing significant tip wear or cracking. Replacement carbide teeth are stocked in Ansan-si and available for next-day domestic delivery.
Are Korean government machinery subsidies available?
Agricultural machinery subsidies (농업기계화 촉진 지원사업) are administered annually by the Ministry of Agriculture, Food and Rural Affairs through provincial agricultural technology centers (농업기술센터). Eligible equipment categories change annually. Confirm current subsidy eligibility with your regional center before purchase. We can provide the technical specification documentation required for subsidy applications on request.
Customer Reviews
Kim Jae-won — Apple Orchard Contractor, Cheongdo-gun, Gyeongsangbuk-do (2024)
★★★★★
"Using the THOR 2.4 in pull-mode on slopes averaging 22–28% across the Cheongdo apple belt. Before the Kit Drawbar configuration, I was losing traction on the steeper sections and having to make multiple short passes. Pull-mode changes the weight distribution completely — the tractor stays planted and the machine works cleanly. The Kit Drawbar is the specific reason I chose this model."
Park Seon-mi — Ginseng Farm, Geumsan-gun, South Chungcheong (2024–2025)
★★★★★
"Ginseng requires zero stones in the seedbed for the 6-year rotation. THOR 2.4 first to crush the large stones, CT-2100 to collect the fragments. Two seasons with this setup and seedbed rejection at inspection dropped from 12% to under 2%. The Korea Watanabe team recommended the 2.4 for our narrow ginseng rows — the right advice."
Choi Byeong-hak — Land Development Contractor, Jeju City (2024)
★★★★★
"Processing Jeju basalt on a 15-hectare citrus orchard preparation contract. The oil cooling system is what makes the THOR 2.4 viable for Jeju work — two other brands I tried had heat-related performance drops after 2–3 hours in summer. The THOR 2.4 ran full working days without any cooling stops."
Lee Tae-il — Farm Road Contractor, Yangyang-gun, Gangwon-do (2025)
★★★★★
"Building mountain farm access roads in Gangwon. The THOR 2.4 in pull-mode is the machine that makes steep gradient work safe — about 35 km of mountain track across two seasons with no drive issues. The hydraulic output size adjustment is genuinely useful: fine for road surface, coarser for drainage layers."
Yoon Ji-eun — Vegetable Farm (Onion, Garlic), Seosan, South Chungcheong (2025)
★★★★★
"Annual spring stone clearance across 45 hectares. The THOR 2.4 completes the clearance pass in about 12 working days and the adjustable output grid covers both agricultural field preparation and drainage margin work in one machine."
Han Dong-min — Equipment Dealer, Gyeonggi-do (ongoing)
★★★★★
"14 THOR 2.4 units placed with clients over two years — orchards, ginseng, vegetables, road contractors. The Kit Drawbar pull-mode closes the sale for orchard operators every time. No competing product at this price point offers the same slope work solution. Local parts availability in Ansan-si means any carbide tooth replacement is next-day."
Tell Us Your Tractor and Field — We Confirm the Right Model
Tractor model + field type + slope conditions + annual area → specific recommendation in one business day. Both THOR 2.4 and THOR 3.0 in local stock at rock-crusher-tractor.com, Ansan-si, Gyeonggi-do.
Additional information
| Editor | Cxm |
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