{"id":1083,"date":"2026-05-18T05:11:53","date_gmt":"2026-05-18T05:11:53","guid":{"rendered":"https:\/\/pto-gearbox.net\/?post_type=product&p=1083"},"modified":"2026-05-18T05:11:53","modified_gmt":"2026-05-18T05:11:53","slug":"agricultural-grain-harvester-reversing-gearbox-11-53-bevel-gear-bi-directional-drive-for-blockage-clearing-and-crop-flow-reversal","status":"publish","type":"product","link":"https:\/\/pto-gearbox.net\/ko\/product\/agricultural-grain-harvester-reversing-gearbox-11-53-bevel-gear-bi-directional-drive-for-blockage-clearing-and-crop-flow-reversal\/","title":{"rendered":"\ub18d\uc5c5\uc6a9 \uace1\ubb3c \uc218\ud655\uae30 \uc5ed\ud68c\uc804 \uae30\uc5b4\ubc15\uc2a4 \u2014 1:1.53 \ubca0\ubca8 \uae30\uc5b4 \uc591\ubc29\ud5a5 \uad6c\ub3d9 \uc7a5\uce58 (\ub9c9\ud798 \uc81c\uac70 \ubc0f \uc791\ubb3c \ud750\ub984 \ubc29\ud5a5 \uc804\ud658\uc6a9)"},"content":{"rendered":"
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Grain Harvester Reversing Gearbox \u2014 1:1.53 Bevel Gear Bi-Directional Drive<\/h2>\n

The grain harvester reversing gearbox adds bi-directional capability to combine harvester threshing and feeding systems through a 1:1.53 bevel gear ratio and an integrated shift mechanism. When wet or dense crop material causes a blockage in the header, feeder house, or threshing drum, the operator engages reverse mode from the cab \u2014 the crop flow reverses, the blockage clears, and forward harvesting resumes within seconds. Without this capability, clearing a jam requires shutting down the harvester, exiting the cab, and manually pulling tangled crop material from the mechanism \u2014 a process that costs 10-20 minutes per event and exposes the operator to rotating equipment hazards.<\/p>\n

The housing is cast from QT450 ductile iron, a material grade that combines the strength of steel with the castability of iron. Internal drive shafts are machined from 20CrMnTi carburized alloy steel \u2014 one of the standard gear shaft materials for Chinese-manufactured \ub18d\uc5c5\uc6a9 \uae30\uc5b4\ubc15\uc2a4<\/strong> applications \u2014 paired with bearings sourced from QC, C&U, or NTN depending on production batch. The 1:1.53 ratio provides a mild speed change between the harvester’s main drive and the reversible mechanism, converting input speed into the output RPM range that the threshing or feeding system requires for effective crop processing in both directions.<\/p>\n

\"\ub18d\uc5c5\uc6a9<\/p>\n

Korean rice, barley, and wheat harvest operations in Jeolla, Chungcheong, and Gyeongsang provinces install this gearbox on domestically manufactured and imported combine harvesters. The Korean grain harvest window is compressed into 3-4 weeks in October and November \u2014 every hour of harvester downtime directly reduces the season’s yield recovery. A reversing PTO \uae30\uc5b4\ubc15\uc2a4<\/strong> that clears blockages in seconds rather than minutes translates directly into additional hectares harvested per day.<\/p>\n

<\/p>\n

\uae30\uc220 \uc0ac\uc591<\/h2>\n

Parameters for the grain harvester reversing gearbox. Verify shaft dimensions and mounting interface against your harvester model before ordering.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\ub9e4\uac1c\ubcc0\uc218<\/th>\n\uac12<\/th>\n<\/tr>\n<\/thead>\n
Product Type<\/td>\nGrain Harvester Reversing Gearbox<\/strong><\/td>\n<\/tr>\n
\uae30\uc5b4 \ud0c0\uc785<\/td>\n\ubca0\ubca8 \uae30\uc5b4<\/strong><\/td>\n<\/tr>\n
\uae30\uc5b4\ube44<\/td>\n1 : 1.53<\/strong><\/td>\n<\/tr>\n
\uc8fc\ud0dd \uc790\uc7ac<\/td>\nQT450 Ductile Iron<\/strong><\/td>\n<\/tr>\n
\uc0e4\ud504\ud2b8 \uc7ac\uc9c8<\/td>\n20CrMnTi<\/strong> (carburized alloy steel)<\/td>\n<\/tr>\n
\ubb38\uc7a5<\/td>\nQC \/ C&U \/ NTN<\/td>\n<\/tr>\n
Direction Control<\/td>\nForward + Reverse (shift mechanism)<\/td>\n<\/tr>\n
Primary Application<\/td>\nGrain Combine Harvesters<\/td>\n<\/tr>\n
\uae30\ub2a5<\/td>\nBlockage clearing, crop flow reversal<\/td>\n<\/tr>\n
Color Options<\/td>\nDark \/ Red \/ Custom<\/td>\n<\/tr>\n
\ubcf4\uc99d<\/td>\n1.5 Years<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Harvest Operations That Demand Reversing Capability<\/h2>\n

Rice Harvest in Wet Conditions<\/h3>\n

Korean rice harvest coincides with the autumn rain season. Wet rice straw wraps around the threshing drum and clogs the feeder mechanism far more frequently than dry straw \u2014 blockage rates increase by 3-5 times when straw moisture exceeds 25%. The reversing gearbox clears these wet-straw jams from the cab within 10-15 seconds, avoiding the 15-20 minute manual clearing process that costs the operator cumulative hours over a 3-week harvest window on 20+ hectare operations.<\/p>\n

Barley and Wheat Header Blockages<\/h3>\n

Winter barley and wheat harvest in May and June across Jeolla and Gyeongsang provinces encounters green weed stems mixed with ripe grain stalks. The green material \u2014 more flexible and tangled than dry grain straw \u2014 wraps around header augers and feeder chain flights. Reversing the crop flow pulls the tangled weed material backward and drops it clear of the mechanism, eliminating the most common cause of header-induced downtime.<\/p>\n

Dense Lodged Crop Recovery<\/h3>\n

Typhoon-flattened rice paddies \u2014 a recurring challenge in Korean coastal provinces \u2014 present severely lodged crop that feeds unevenly into the harvester header. The reversing function lets the operator back the crop flow out when an uneven slug of tangled material enters the feeder, reposition the header angle, and re-engage forward flow at a controlled rate. This reduces the grain loss and mechanical stress that occur when an overloaded feeder stalls against a dense crop slug.<\/p>\n

\"Agricultural<\/p>\n

Selection Guide \u2014 Matching the Reversing Gearbox to Your Harvester<\/h2>\n

Follow these steps to confirm compatibility before ordering:<\/p>\n

    \n
  1. Identify your harvester model and year.<\/strong> Korean-market combine harvesters from Daedong (Kioti), TYM, Kukje, and imported models from Kubota, Yanmar, and John Deere each have specific gearbox mounting interfaces. Provide your harvester make, model, and production year when requesting a compatibility check.<\/li>\n
  2. Measure the existing gearbox mounting interface.<\/strong> Record the bolt pattern (number of bolts, circle diameter, bolt size), input shaft spline profile, output shaft diameter and type, and the distance between the mounting face and the centerline of each shaft. The reversing gearbox must match these dimensions to ensure direct bolt-on installation.<\/li>\n
  3. Confirm the shift mechanism type.<\/strong> Different harvester models use mechanical cable, hydraulic cylinder, or electronic actuator controls for the reverse engagement. Specify your control type to receive a gearbox with the matching shift interface \u2014 cable bracket, hydraulic port, or electric solenoid.<\/li>\n
  4. Determine the required direction of rotation.<\/strong> The 1:1.53 ratio applies in both forward and reverse, but the rotational direction of the output shaft must match the threshing drum or feeder chain direction specified by the harvester manufacturer. Clockwise and counter-clockwise versions are available.<\/li>\n
  5. Select color finish.<\/strong> Standard options are dark (black enamel) and red (agricultural equipment red). Custom colors available for OEM orders of 10+ units to match your harvester brand’s color scheme.<\/li>\n<\/ol>\n

    <\/p>\n

    Reversing vs. Single-Direction Gearbox \u2014 Is the Upgrade Worth It?<\/h2>\n

    Many older and economy-model combine harvesters use single-direction gearboxes that only drive the threshing mechanism forward. Upgrading to a reversing gearbox adds cost and mechanical complexity \u2014 here is where that investment pays off and where it does not.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n
    \uc694\uc778<\/th>\nReversing Gearbox (This Unit)<\/th>\nSingle-Direction Gearbox<\/th>\n<\/tr>\n<\/thead>\n
    Blockage Clearing Time<\/td>\n10-15 seconds (from cab)<\/strong><\/td>\n15-20 minutes (manual)<\/td>\n<\/tr>\n
    Operator Safety<\/td>\nOperator stays in cab<\/td>\nExposure to rotating parts<\/td>\n<\/tr>\n
    Wet Crop Performance<\/td>\nHandles frequent blockages<\/strong><\/td>\nFrequent manual intervention<\/td>\n<\/tr>\n
    Internal Complexity<\/td>\nHigher (shift mechanism)<\/td>\nSimpler (fewer parts)<\/td>\n<\/tr>\n
    Unit Cost<\/td>\n\ub354 \ub192\uc740<\/td>\n\ub0ae\ucd94\ub2e4<\/td>\n<\/tr>\n
    Daily Harvest Output<\/td>\nHigher (less downtime)<\/strong><\/td>\nLower in wet conditions<\/td>\n<\/tr>\n
    Ideal Conditions<\/td>\nWet\/dense\/lodged crops<\/td>\nDry, uniform, standing crops<\/td>\n<\/tr>\n
    ROI Breakeven<\/td>\n1-2 harvest seasons<\/td>\nN\/A (baseline cost)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    For Korean rice operations \u2014 where autumn rain makes wet-crop blockages a near-daily occurrence during harvest \u2014 the reversing gearbox pays for itself within the first season through reduced downtime alone. For operations harvesting only dry grain in arid conditions (rare in Korea’s monsoon climate), the single-direction gearbox remains adequate. The 1.5-year warranty covers the initial investment risk for operators evaluating the upgrade.<\/p>\n

    <\/p>\n

    Harvest Efficiency Impact Analysis<\/h2>\n

    The reversing gearbox’s value comes from downtime reduction rather than mechanical power efficiency. Here is how the numbers work for a typical Korean rice harvest operation.<\/p>\n