{"id":12032,"date":"2026-03-24T08:52:42","date_gmt":"2026-03-24T08:52:42","guid":{"rendered":"https:\/\/pto-gearbox.xyz\/?post_type=product&p=12032"},"modified":"2026-03-24T08:52:45","modified_gmt":"2026-03-24T08:52:45","slug":"rotary-tiller-pto-gearbox-replacement-for-comer-tb-22c","status":"publish","type":"product","link":"https:\/\/pto-gearbox.xyz\/ja\/product\/rotary-tiller-pto-gearbox-replacement-for-comer-tb-22c\/","title":{"rendered":"\u30ed\u30fc\u30bf\u30ea\u30fc\u30c6\u30a3\u30e9\u30fc\u7528PTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\uff5cComer TB-22C\u306e\u4ea4\u63db\u90e8\u54c1"},"content":{"rendered":"

Rotary Tiller PTO Gearbox Overview<\/h2>\n

The TB-22C is a heavy-duty \u30ed\u30fc\u30bf\u30ea\u30fc\u30c6\u30a3\u30e9\u30fcPTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b> rated at 98 HP (72.1 kW) in speed-increasing mode \u2014 one of the highest power ratings in the Comer TB series. This unit serves as the central transmission for large-frame rotary tillers, power harrows, and multi-blade soil cultivation equipment used on commercial crop farms. The 1:1.93 speed-increasing ratio converts the tractor’s 540 RPM PTO output to approximately 1,042 RPM at the tiller blade shaft via the PTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b>, while the reducing configuration (1.93:1) delivers a massive 199.9 daNm of output torque for applications demanding raw turning force over speed.<\/p>\n

\"Rotary<\/p>\n

Manufactured as a direct replacement for the Comer Industries TB-22C, this PTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b> uses a GG25 grey cast iron housing \u2014 a grade selected for its vibration damping properties and cost-effective production at this weight class. Total weight is 31.5 kg with a generous 3.3-litre oil reservoir, reflecting the high continuous power and heat generation at 98 HP. Both the Y (input) and Z (output) shafts use 1 3\/8-inch, 6-spline connections (Type B and Type D respectively), maintaining compatibility with standard \u8fb2\u696d\u7528PTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b> driveline components.<\/p>\n

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\u6280\u8853\u4ed5\u69d8<\/h2>\n

\"rotary-tiller-pto-gearbox-tb22c-dimensions-combo-1\"<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
\u5fdc\u7528<\/td>\nRotary tillers, multi-blade cultivators, power harrows<\/td>\n<\/tr>\n
Input Power (Increasing)<\/td>\n72.1 kW \/ 98 HP<\/td>\n<\/tr>\n
Input Power (Reducing)<\/td>\n60.4 kW \/ 82 HP<\/td>\n<\/tr>\n
Ratio (Increasing)<\/td>\n1 : 1.93<\/td>\n<\/tr>\n
Ratio (Reducing)<\/td>\n1.93 : 1<\/td>\n<\/tr>\n
Output Torque (Increasing)<\/td>\n64 daNm<\/td>\n<\/tr>\n
Output Torque (Reducing)<\/td>\n199.9 daNm<\/td>\n<\/tr>\n
\u5165\u529b\u901f\u5ea6<\/td>\n540\u56de\u8ee2\/\u5206<\/td>\n<\/tr>\n
Shaft Y (Input)<\/td>\n1 3\/8″ (6) Type B<\/td>\n<\/tr>\n
Shaft Z (Output)<\/td>\n1 3\/8″ (6) Type D<\/td>\n<\/tr>\n
\u30cf\u30a6\u30b8\u30f3\u30b0\u6750<\/td>\nCast Iron GG25<\/td>\n<\/tr>\n
Oil Capacity and Type<\/td>\n3.3 L, GL-5 80W-90<\/td>\n<\/tr>\n
Oil Change Interval<\/td>\n500 h<\/td>\n<\/tr>\n
\u91cd\u3055<\/td>\n31.5 kg<\/td>\n<\/tr>\n
Gear Arrangement (Increasing)<\/td>\n23 – 24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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How the Rotary Tiller Gearbox Works<\/h2>\n

In a rotary tiller, the PTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b> sits at the center of the implement frame, receiving power from the tractor PTO and distributing it to the tiller blade shaft that runs the full width of the machine. The TB-22C handles this through a heavy-duty bevel gear pair (arrangement 23-24) inside the GG25 housing. At 540 RPM input, the 1:1.93 ratio delivers approximately 1,042 RPM to the blade shaft in increasing mode \u2014 fast enough for the L-shaped tiller blades to slice through soil effectively at the 150-250 mm tillage depths typical of Korean rice paddy and vegetable field preparation.<\/p>\n

\"rotary-tiller-pto-gearbox-tb22c-application-combo-1\"<\/p>\n

In reducing mode, the 1.93:1 ratio drops the output speed to about 280 RPM while multiplying the torque to 199.9 daNm. This configuration is used when the tiller encounters heavy clay soils, compacted subsoil layers, or when operating wide-frame tillers (2.5-3.5 m working width) where the total blade resistance is high. The 3.3-litre oil capacity is the largest in the TB gearbox range, providing the thermal buffer needed to dissipate the heat generated during sustained 80-98 HP loading in challenging soil conditions. The oil specification calls for GL-5 grade 80W-90, which provides the extreme-pressure additives that the heavily loaded bevel gear teeth require.<\/p>\n

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Structure and Material<\/h2>\n

The TB-22C uses GG25 grey cast iron for its housing \u2014 a different grade than the GGG40 ductile iron used on most mower and flail gearboxes. GG25 offers excellent vibration damping characteristics, which is particularly relevant for rotary tiller applications where the gearbox is subjected to continuous high-frequency vibrations from dozens of blade tips striking soil, rocks, and crop residue simultaneously. The flake graphite structure in GG25 absorbs and dissipates this vibrational energy more effectively than nodular (ductile) iron, reducing housing resonance and the fatigue stress that resonance causes over thousands of operating hours.<\/p>\n

\"rotary-tiller-pto-gearbox-tb22c-product-combo-1\"<\/p>\n

The gear arrangement (designated 23-24) uses a larger gear module than the lighter LF or T-series gearboxes, with wider tooth faces and deeper tooth roots to handle the 199.9 daNm torque capacity. Bearings are heavy-duty taper roller type with interference-fit races for maximum rigidity under the high axial and radial loads that the bevel mesh generates. Both shaft seals use triple-lip designs with integrated dust excluders \u2014 a necessity in tiller service where the gearbox operates in a continuous cloud of soil particles, clay dust, and debris thrown up by the rotating blades.<\/p>\n

\"PTO<\/p>\n

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Application Scenarios<\/h2>\n

Rice Paddy Tillage<\/h3>\n

Korean rice production relies heavily on rotary tillers for spring seedbed preparation. The TB-22C powers 2.0-3.0 m wide tillers that work flooded or semi-flooded paddy soil to a depth of 150-200 mm, creating the fine, level seedbed that rice transplanting requires. The 98 HP rating matches the 70-100 HP utility tractors used on commercial paddy operations, where 50-100 hectares may need tilling within a narrow spring window.<\/p>\n

Vegetable Field Preparation<\/h3>\n

Intensive vegetable farms in Gyeonggi-do and Chungcheong provinces use heavy tillers to break up compacted soil and incorporate crop residue before planting onions, garlic, potatoes, and cabbage. The \u30c8\u30e9\u30af\u30bf\u30fcPTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b> in reducing mode provides the torque to push tiller blades through dense clay and organic matter layers without stalling.<\/p>\n

Power Harrowing<\/h3>\n

Power harrows use a similar PTO\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/b>-driven drivetrain to rotary tillers but with vertically oriented tine sets instead of L-shaped blades. The TB-22C serves as the central gearbox for large power harrows used in seedbed finishing after plowing. The high torque in reducing mode is particularly valuable for power harrowing in heavy soils where tine resistance is highest.<\/p>\n

\"PTO<\/p>\n

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Installation and Oil Change Guide<\/h2>\n