ロータリーモア用PTOギアボックス｜Comer LF-205Jの交換部品
The rotary mower PTO gearbox with 1:1.92 speed-increasing ratio. GGG40 cast iron housing, 16 kg, 0.8 L oil capacity. Output torque 20 daNm. Input 1 3/8 inch 6-spline, output ASA Z12 sprocket shaft with 40 mm bore. Direct replacement for Comer LF-205J. ISO-certified, 12-month warranty.
Rotary Mower PTO Gearbox Overview
The LF205J is a compact rotary mower PTO gearbox rated at 30 HP (22 kW) with a 1:1.92 speed-increasing ratio. At 540 RPM PTO input, the output reaches approximately 1,037 RPM through the ASA Z12 sprocket shaft — matching the blade speed requirements of light-to-medium duty rotary mower decks used on smaller Korean farms, orchards, and municipal grounds. The GGG40 ductile cast iron housing weighs just 16 kg with a 0.8 L oil reservoir, making it one of the lighter cast iron PTOギアボックス units in the LF series.
Manufactured as a direct replacement for the Comer LF-205J, this 農業用PTOギアボックス matches all critical dimensions: 1 3/8-inch 6-spline input, ASA Z12 D.P. 8/16 sprocket output with 40 mm bore, and original mounting bolt pattern. The output torque rating of 20 daNm in increasing mode is sized for 20-30 HP compact tractors — the most common tractor class on Korean specialty crop farms and small-scale livestock operations. Korea Ever-Power stocks this model for 2-4 day delivery nationwide.
技術仕様
| パラメータ | Value |
|---|---|
| 応用 | Mowers |
| Max. Input Power | 22 kW / 30 HP |
| Ratio (Increasing) | 1 : 1.92 |
| Ratio (Reducing) | 1.92 : 1 |
| Output Torque (Increasing) | 20 daNm |
| Shaft X (Input) | 1 3/8" (6) Z6 |
| Shaft Z (Output) | ASA Z12 D.P. 8/16, Ø40 mm |
| ハウジング材 | Cast Iron GGG40 |
| Oil Capacity | 0.8 L (80W-90) |
| Oil Change Interval | 500 h |
| 重さ | 16 kg |
How This PTO Gearbox Works
The tractor PTO delivers 540 RPM through a driveshaft to the LF205J's 1 3/8-inch 6-spline input. Inside the GGG40 housing, a spiral bevel gear pair redirects the power 90 degrees while increasing the speed by a factor of 1.92. The output shaft — an ASA Z12 sprocket profile with a 40 mm bore — engages directly with the mower deck's chain drive system, eliminating the need for a separate coupling sprocket. This sprocket output design is specific to the LF series and is the primary reason these gearboxes are not interchangeable with standard cylindrical-output models, even when the ratio and power rating are similar. The 0.8-litre oil reservoir provides oil bath lubrication to the gear contact zone and bearings, with adequate thermal capacity for the 30 HP continuous duty cycle.
Installation and Maintenance
- ▶Fill with 0.8 L of SAE 80W-90 gear oil before first use. The gearbox ships dry.
- ▶Verify the PTO shaft telescoping overlap is at least 100 mm in the working position.
- ▶Confirm the ASA Z12 sprocket engages smoothly with the mower chain before applying power.
- ▶Change oil after the first 50 hours, then every 500 hours or annually.
- ▶Check oil level and clean the breather vent before each mowing session.
- ▶Inspect shaft seals for leakage after every 100 hours. Replace promptly if oil weeping is visible.
Application Scenarios
Small Farm Pasture Mowing
The LF205J is sized for the 20-30 HP compact tractors common on Korean small-scale dairy, goat, and poultry farms. These operations typically maintain 2-8 hectares of pasture with a 2-spindle or 3-spindle mower deck. The 1:1.92 ratio delivers approximately 1,037 RPM to the sprocket drive — fast enough for a clean cut on ryegrass, clover, and mixed pasture species at travel speeds of 5-10 km/h.
Orchard Inter-Row Mowing
Apple, pear, and citrus orchards use compact mower decks between tree rows to suppress weeds and manage cover crops. The LF205J's 16 kg weight keeps the overall mower assembly light enough for small tractors navigating narrow orchard paths. The PTOギアボックス output speed matches the blade tip velocity needed for clean cutting of soft vegetation without damaging fallen fruit or mulch.
Related and Companion Products
The driveshaft connecting tractor to gearbox needs to match both the 30 HP torque rating and the physical length requirements of your specific mower mounting. On compact tractors, the distance between PTO stub and gearbox input is shorter than on full-size utility tractors, so a properly cut-to-length shaft is important to avoid over-compression or binding during hitch travel. Korea Ever-Power manufactures matched PTO shaft assemblies in multiple length configurations with the guard coverage and torque ratings needed for mower service on compact tractors.
We also carry the full LF gearbox series (LF125J, LF140J, LF151A, LF205J, LF211J, LF227J) and over 400 additional 農業用ギアボックス models covering replacement applications for all major OEM brands. If you need the larger 60 HP LF140J for a heavier mower deck, or a different ratio for your specific application, our technical team can help select the right model.
よくある質問
1:1.92 in speed-increasing mode. At 540 RPM input, the output shaft delivers approximately 1,037 RPM. In reducing mode, the ratio is 1.92:1.
Yes. All shaft dimensions, sprocket profile (ASA Z12), and mounting patterns match the original Comer design. Direct bolt-in installation with existing hardware.
ASA Z12 D.P. 8/16 sprocket profile with a 40 mm bore. This engages directly with chain drives on multi-spindle mower decks.
0.8 litres of SAE 80W-90. Ships dry. First change at 50 hours, then every 500 hours or annually.
The LF205J is rated for a maximum of 30 HP input. Running a 40 HP tractor at full PTO load will overstress the gears and bearings. Step up to the LF140J (60 HP) for larger tractors.
Stocked in our Korea warehouse. Orders before 2 PM KST ship same day. See all mower gearboxes at our PTO gearbox catalogue.
Customer Reviews
"We mow about 5 hectares of goat pasture with a 25 HP Kukje and a 2-spindle deck. The LF205J replaced our old gearbox that had developed a bearing whine. Direct swap, took 30 minutes. Runs quietly, no oil leaks after 100 hours. Happy with the purchase."
"Light gearbox for a light tractor. Fits our inter-row mowing needs perfectly. The 16 kg weight makes a real difference compared to the 28 kg models — our 22 HP tractor doesn't struggle with hitch balance."
"We do park and garden mowing. The ASA Z12 sprocket output fit our existing chain setup without any adapter. Clean output speed, consistent cut quality. Ordered a second one for our backup rig."
"The LF205J and LF140J are my best-selling mower gearboxes. Between the two they cover the 20-60 HP compact tractor range that dominates Korean farm sales. Consistent supply from Ever-Power, good margin."
Why Choose Korea Ever-Power
- ★Over 20 years of experience manufacturing and exporting agricultural transmission components, with particular depth in rotary mower gearbox replacements for the Korean and Southeast Asian markets.
- ★ISO 9001-certified production facility with individual bench testing on every gearbox for gear noise, seal integrity, and dimensional accuracy before dispatch.
- ★Korea-based warehouse and logistics — orders confirmed before 2 PM KST ship same day, with 2-4 business day delivery nationwide including Jeju and island regions.
- ★Full LF mower gearbox series in stock (LF125J through LF227J), plus 400+ additional models covering all major agricultural implement categories.
- ★Factory-direct pricing at 30-50% below European OEM parts, with volume discounts for agricultural cooperatives and equipment dealers.
- ★12-month warranty covering manufacturing defects, backed by local after-sales service and fast spare parts delivery.
Packing and Shipping
追加情報
| Editor | Cxm |
|---|
