{"id":672,"date":"2026-05-26T03:21:14","date_gmt":"2026-05-26T03:21:14","guid":{"rendered":"https:\/\/rock-crusher-tractor.com\/?p=672"},"modified":"2026-05-26T03:21:14","modified_gmt":"2026-05-26T03:21:14","slug":"thor-kit-drawbar-slope-safety-korean-highland-terraces","status":"publish","type":"post","link":"https:\/\/rock-crusher-tractor.com\/id\/thor-kit-drawbar-slope-safety-korean-highland-terraces\/","title":{"rendered":"Penjelasan Kit Drawbar \u2014 Cara Kerja Sistem Keamanan Lereng Watanabe di Teras Dataran Tinggi Korea"},"content":{"rendered":"
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<\/div>\n
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Kit Drawbar Explained \u2014 How Watanabe’s Slope Safety System Makes the THOR 2.4 Safe on Korean Highland Terraces<\/h1>\n

A 2,300 Kg stone crusher mounted on the rear three-point hitch of a 180 HP tractor creates rear-heavy weight distribution that becomes dangerous on Korean highland slopes above 10\u201315%. The Kit Drawbar is the engineering solution \u2014 included as standard with every THOR 2.4 sold in Korea.<\/p>\n

Discuss Slope Terrain Configuration<\/a><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

The Kit Drawbar is one of the most important features of the Watanabe Penghancur batu THOR 2.4<\/a> for Korean highland use \u2014 and one of the least understood by farmers who have not operated on slope terrain. Most stone crushers sold globally are designed for flat field operation: mounted on the rear three-point hitch, the machine is pushed forward by the tractor. This mounting configuration works well on flat ground. On Korean highland terraces at 15\u201335% gradient, it creates a tip-back stability problem that the Kit Drawbar specifically solves.<\/p>\n

This guide explains the physics of the tip-back problem on slopes, how the Kit Drawbar converts the load path to eliminate that problem, when to switch between three-point-hitch mode and Kit Drawbar pull-mode, and what the gradient thresholds are for safe operation in each configuration on Korean highland terrain.<\/p>\n

<\/p>\n

The Tip-Back Problem \u2014 Why Rear-Mount Stone Crushers Are Dangerous on Korean Slopes<\/h2>\n

\"THOR<\/p>\n

When a 2,300 Kg stone crusher is mounted on a tractor’s rear three-point hitch, its weight is added to the rear axle load. On flat ground, the front axle remains on the ground because the front of the tractor and any front ballast counteracts the rear weight moment. The tractor remains stable because the combined centre of gravity of the tractor-plus-implement system falls between the front and rear axle contact points.<\/p>\n

On an uphill slope, the geometry changes. The gradient tilts the tractor and implement system backward \u2014 moving the effective centre of gravity toward the rear axle. As slope angle increases, there comes a point where the centre of gravity moves behind the rear axle contact point \u2014 the tractor begins to tip backward. This is the tip-back threshold, and it can be reached at surprisingly modest slope angles when a heavy rear implement is involved:<\/p>\n

\n
\n
0\u20138% slope<\/div>\n
Standard rear-mount safe with standard front ballast<\/div>\n<\/div>\n
\n
8\u201315% slope<\/div>\n
Rear-mount marginal; front ballast required; caution advised<\/div>\n<\/div>\n
\n
15\u201325% slope<\/div>\n
Rear-mount dangerous on most Korean farm tractors with THOR 2.4 weight<\/div>\n<\/div>\n
\n
Above 25%<\/div>\n
Rear-mount operation must not be attempted \u2014 Kit Drawbar mandatory<\/div>\n<\/div>\n<\/div>\n

Korean highland terrace fields \u2014 particularly in Taebaek, Jeongseon, Pyeongchang, and the ginseng-growing highland zones of North Gyeongsang \u2014 regularly feature individual terrace slopes of 15\u201335%. Farmers who have attempted to operate conventional rear-mounted stone crushers on these slopes report front-axle lift events (front wheels coming off the ground during uphill passes), steering loss (front wheels off the ground provide no steering), and in worst cases, tractor tip-back with the implement acting as the fulcrum. These events cause machine damage, field damage, and serious operator injury risk.<\/p>\n

<\/p>\n

How the Kit Drawbar Works \u2014 Converting Rear-Push to Drawbar-Pull<\/h2>\n

\"THOR<\/p>\n

The Kit Drawbar converts the THOR 2.4 from rear three-point-hitch mounting to drawbar tow. In this configuration, the THOR is no longer mounted on the tractor’s rear hitch links \u2014 it rests on its own ground wheels (the Kit Drawbar wheels) and is connected to the tractor’s drawbar point. The PTO shaft still transmits power from the tractor to the THOR rotor. The fundamental change is the load path:<\/p>\n

\n
\n

Rear three-point-hitch (standard mounting)<\/p>\n

THOR weight is a moment arm acting on the tractor rear axle. On uphill slopes, this moment arm attempts to rotate the tractor backward around the rear axle contact point \u2014 tipping the front of the tractor upward. The longer the implement and the heavier it is, the greater the tipping moment at any given slope angle.<\/p>\n<\/div>\n

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Kit Drawbar pull-mode<\/p>\n

THOR weight rests on the Kit Drawbar wheels, which are on the ground behind and below the tractor. The drawbar connection point transmits only the forward towing force (horizontal draft) \u2014 not a vertical lifting moment. The THOR weight no longer loads the tractor’s rear axle. The front axle retains full ground contact and steering authority. On uphill slopes, the drawbar pull force actually pushes the tractor’s front axle into the ground rather than lifting it \u2014 the opposite of the rear-mount tip-back tendency.<\/p>\n<\/div>\n<\/div>\n

This load path reversal is why the Kit Drawbar is not merely a convenience feature \u2014 it is a fundamental change in the machine’s slope stability physics. A tractor that could not safely operate the THOR 2.4 in rear-mount mode on a 20% slope can operate it safely in Kit Drawbar mode on the same slope, because the stability-threatening load path has been eliminated.<\/p>\n

<\/p>\n

When to Use Each Mode \u2014 Decision Guide for Korean Highland Operators<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n
Kondisi lapangan<\/th>\n3PH Rear-Mount<\/th>\nKit Drawbar Pull-Mode<\/th>\n<\/tr>\n<\/thead>\n
Flat field (0\u20138% slope)<\/td>\n\u2705 Standard mode<\/td>\nAcceptable but no advantage<\/td>\n<\/tr>\n
Gentle slope (8\u201312%)<\/td>\n\u26a0 Adequate with front ballast<\/td>\n\u2705 Recommended<\/td>\n<\/tr>\n
Moderate slope (12\u201320%)<\/td>\n\u274c Dangerous \u2014 not recommended<\/td>\n\u2705 Required<\/td>\n<\/tr>\n
Steep slope (20\u201335%)<\/td>\n\u26d4 Must not operate<\/td>\n\u2705 Standard mode for steep terraces<\/td>\n<\/tr>\n
Road transport between fields<\/td>\n\u2705 Preferred for short-distance road moves<\/td>\nAcceptable for transport<\/td>\n<\/tr>\n
Working in confined terrace width<\/td>\n\u2705 Shorter overall machine length<\/td>\n\u26a0 Longer overall \u2014 confirm terrace width<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Switching Between Modes \u2014 Field Procedure<\/h2>\n

\"Stone<\/p>\n

On Korean highland farms where the same THOR 2.4 must work both flat access road sections and steep terrace sections on the same day, mode switching between three-point-hitch mount and Kit Drawbar pull-mode must be performed efficiently and correctly. The procedure:<\/p>\n

\n
Langkah 1<\/span><\/p>\n

Move to a flat, stable surface to perform the mode switch \u2014 not on the slope itself. Lower the THOR to its resting position on the ground.<\/p>\n<\/div>\n

Langkah 2<\/span><\/p>\n

Disengage the PTO. Remove the PTO shaft from the tractor PTO stub. Place the PTO shaft in the rest position (secured to the machine frame \u2014 never allow it to drag on the ground).<\/p>\n<\/div>\n

Langkah 3<\/span><\/p>\n

Disconnect the three lower hitch links from the THOR mounting brackets. Lower the three-point-hitch links to the lowered rest position out of the way.<\/p>\n<\/div>\n

Langkah 4<\/span><\/p>\n

Deploy the Kit Drawbar wheels from their transport position (folded up) to working position (supporting the machine weight). Confirm the Kit Drawbar wheel height setting provides the correct working depth for the field conditions.<\/p>\n<\/div>\n

Langkah 5<\/span><\/p>\n

Connect the drawbar hitch pin from the tractor drawbar to the THOR Kit Drawbar tow point. Confirm pin secured with retaining clip.<\/p>\n<\/div>\n

Langkah 6<\/span><\/p>\n

Reconnect the PTO shaft to the tractor PTO stub. Confirm PTO shaft length is within operating range for the Kit Drawbar geometry \u2014 the longer distance from tractor to THOR in pull-mode may require an extended PTO shaft. Confirm with the THOR operator manual for your specific configuration.<\/p>\n<\/div>\n

\u2713 Done<\/span><\/p>\n

Kit Drawbar pull-mode ready. Confirm by forward-moving 5 metres on level ground and checking THOR tracking and PTO shaft operation before entering the slope.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Measuring Slope Gradient on Korean Highland Fields<\/h2>\n

Korean highland farmers who are unsure whether their field slope requires Kit Drawbar mode can measure it simply before starting work. Slope gradient (expressed as percentage) is the vertical rise divided by horizontal run, multiplied by 100:<\/p>\n

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Simple field slope measurement method:<\/p>\n

\n
\u2460<\/span>Place a 1 metre spirit level horizontally on the slope surface (supported at the lower end by a block of the appropriate height to level it)<\/div>\n
\u2461<\/span>Measure the height of the block needed to level the 1 metre spirit level \u2014 this is the vertical rise over 1 metre horizontal distance<\/div>\n
\u2462<\/span>Multiply by 100 to convert to percentage gradient: 15 cm block on 1 m spirit level = 15% slope<\/div>\n
\u2463<\/span>Above 12%: deploy Kit Drawbar pull-mode. 8\u201312%: front ballast + caution in rear-mount. Below 8%: standard rear-mount safe.<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

THOR 3.0 and Kit Drawbar \u2014 The Same Principle at 2,800 Kg<\/h2>\n

\"Korean<\/p>\n

Itu THOR 3.0<\/a> (230 HP, 3.0 m, 2,800 Kg) has the same Kit Drawbar capability as the THOR 2.4, but its 500 Kg additional weight means the tip-back threshold on slopes is reached at slightly lower gradients than for the THOR 2.4. The slope thresholds in the table above apply with a conservative 2\u20133% downward adjustment for the THOR 3.0 \u2014 meaning the 12% Kit Drawbar recommendation for the THOR 2.4 effectively becomes 9\u201310% for the THOR 3.0.<\/p>\n

Additionally, the THOR 3.0’s larger working width (3.0 m vs 2.4 m) and longer overall machine length in Kit Drawbar configuration requires confirming that the Korean highland terrace width is sufficient to accommodate the full machine width plus appropriate side clearances to terrace walls and field boundaries. Confirm terrace width and Kit Drawbar clearance requirements with Korea Watanabe before ordering the THOR 3.0 for slope terrace use.<\/p>\n

<\/p>\n

Kit Drawbar and Orchard Slope Operations \u2014 Additional Applications<\/h2>\n

Beyond highland potato and vegetable field clearing, the Kit Drawbar configuration also serves orchard slope clearing operations \u2014 apple, pear, and persimmon orchards planted on terraced Korean hillsides require annual alley stone management on slopes that are equally problematic for rear-mounted implements. For orchard operations on slopes above 12%, the Kit Drawbar mode is the standard working configuration \u2014 allowing the THOR stone crusher range<\/a> to access the full slope gradient of the orchard terrace rather than being restricted to the lower sections accessible in rear-mount mode.<\/p>\n

The Kit Drawbar’s secondary benefit in orchard operations is its reduced overall height in working position compared to the rear-mount configuration, which can be relevant for orchards with low-hanging branch canopies. In rear-mount mode, the THOR’s raised position when transported between rows can contact low branches. In Kit Drawbar mode, the machine sits lower and further behind the tractor, reducing the risk of branch contact during inter-row access moves.<\/p>\n

Korean ginseng production land also benefits significantly from Kit Drawbar mode on sloped fields. Ginseng growing areas in the highland zones of North Gyeongsang and southern Gangwon-do are frequently on sloped land (10\u201325%) where the multi-year ginseng bed preparation requires thorough stone clearing \u2014 precisely the zero-residual standard that the THOR 2.4 at correct depth provides, and precisely the slope terrain where Kit Drawbar mode is required for safe operation. The Kit Drawbar is therefore as important for highland ginseng land clearance as for highland vegetable production.<\/p>\n

Pertanyaan yang Sering Diajukan<\/h2>\n
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\nDoes the Kit Drawbar affect the THOR’s stone crushing performance?<\/summary>\n

No \u2014 the Kit Drawbar pull-mode does not affect the THOR’s stone crushing performance. The rotor still receives the same 1000 RPM PTO power from the tractor via the PTO shaft (now extended by the drawbar distance), the rotor speed and tip energy remain identical, and the hood adjustment controls the same fragment size output as in rear-mount mode. The only operational difference is in the working depth control: in rear-mount mode, working depth is controlled by the tractor’s three-point hitch position. In Kit Drawbar pull-mode, working depth is controlled by the Kit Drawbar wheel height setting (a mechanical depth-stop that maintains the rotor at the set depth below the Kit Drawbar wheel level). Working depth in Kit Drawbar mode is set before the working pass begins, and adjusted by stopping, resetting the wheel height, and continuing \u2014 unlike rear-mount mode where the tractor operator can adjust depth on-the-go from the cab. This minor operational difference in depth control has no effect on crushing performance.<\/p>\n<\/details>\n

\nIs the Kit Drawbar included as standard with the THOR 2.4, or is it a separate purchase?<\/summary>\n

The Kit Drawbar is included as standard with every THOR 2.4 supplied through Korea Watanabe \u2014 it is not an optional extra or separate purchase. This is a deliberate decision reflecting the reality of Korean highland farming conditions: the majority of Korean highland land suitable for stone clearing has sections at slope angles that require Kit Drawbar operation. Supplying the THOR 2.4 without the Kit Drawbar would leave most Korean highland buyers unable to access a significant portion of their fields safely. The Kit Drawbar is part of the THOR 2.4’s standard specification for the Korean market \u2014 its inclusion is one of the features that Korea Watanabe has established as standard for Korean highland use, recognising that it is not optional for the Korean terrain context even if it may be optional in flatter European or South American agricultural contexts.<\/p>\n<\/details>\n

\nCan I operate the THOR 2.4 on cross-slope terraces (operating across the slope face rather than up-and-down)?<\/summary>\n

Cross-slope operation (traversing the slope face horizontally) presents a different stability risk \u2014 side-slope rollover rather than tip-back. Both rear-mount and Kit Drawbar mode create additional lateral instability on cross-slope operation compared to up-and-down slope operation, because the machine’s mass is offset from the tractor’s longitudinal axis when operating across a side slope. For cross-slope operation on slopes above 8\u201310%, the tractor’s stability limit on side slopes is typically lower than the up-slope tip-back limit \u2014 meaning cross-slope limits are more restrictive. Korean highland terrace fields where rows run along the contour (cross-slope rows) require particular attention to tractor side-slope stability limits. Consult the tractor’s operator manual for the side-slope stability angle limit, and confirm that the field gradient does not exceed that limit before operating across the slope face rather than up and down it.<\/p>\n<\/details>\n

\nWhat is the maximum slope angle for safe THOR 2.4 Kit Drawbar operation?<\/summary>\n

The practical maximum slope for THOR 2.4 Kit Drawbar operation on Korean highland terrain is approximately 30\u201335% (approximately 17\u201319 degrees). Above this gradient, tractor traction and stability considerations become limiting \u2014 the tractor itself may not maintain adequate drive wheel traction on steep, potentially muddy spring granite soil, regardless of the THOR mounting configuration. Additionally, Kit Drawbar operation on very steep slopes (above 30%) can create a situation where the Kit Drawbar wheels dig into the slope surface on downhill passes \u2014 requiring additional care in approach angle and working speed. Korea Watanabe recommends confirming with your tractor dealer the maximum operating slope angle for your specific tractor model in agricultural field conditions before operating the THOR 2.4 on slopes approaching 25\u201330%.<\/p>\n<\/details>\n

\nHow much time does mode-switching between rear-mount and Kit Drawbar take in the field?<\/summary>\n

An experienced Korean highland THOR operator can complete the mode-switch from rear-mount to Kit Drawbar (or back) in approximately 10\u201315 minutes per switch \u2014 once the procedure has been practiced and the required tools (hitch pin, retaining clip tool) are kept in the tractor cab for immediate access. For farms where most field sections require Kit Drawbar mode (predominantly sloped land), operators typically deploy in Kit Drawbar mode for the entire working day and transport to and from the field in that configuration \u2014 avoiding the need for frequent mode switches. For farms with mixed flat and sloped sections, scheduling the flat-section work together and the slope sections together minimises the total number of mode switches per working day. In either case, the 10\u201315 minute switch time is a minor fraction of a full working day \u2014 it does not represent a meaningful operational constraint for typical Korean highland stone clearing schedules.<\/p>\n<\/details>\n<\/div>\n

<\/p>\n

\n

What Slope Is Your Field? \u2014 Kit Drawbar Configuration Consultation<\/p>\n

Maximum field slope (%) + tractor model + field width \u2192 Kit Drawbar vs rear-mount recommendation with PTO shaft extension requirement and working depth setup guidance. Korea Watanabe, Ansan-si, Gyeonggi-do.<\/p>\n

Hubungi Kami Sekarang<\/a><\/p>\n<\/div>\n

Editor: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Kit Drawbar Explained \u2014 How Watanabe’s Slope Safety System Makes the THOR 2.4 Safe on Korean Highland Terraces A 2,300 Kg stone crusher mounted on the rear three-point hitch of a 180 HP tractor creates rear-heavy weight distribution that becomes dangerous on Korean highland slopes above 10\u201315%. The Kit Drawbar is the engineering solution \u2014 […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[31],"tags":[],"class_list":["post-672","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/posts\/672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/comments?post=672"}],"version-history":[{"count":2,"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/posts\/672\/revisions"}],"predecessor-version":[{"id":674,"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/posts\/672\/revisions\/674"}],"wp:attachment":[{"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/media?parent=672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/categories?post=672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/id\/wp-json\/wp\/v2\/tags?post=672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}