Heavy-Duty Central Splitter Gearbox for Korean Stone Crushers
Engineered for Gangwon-do Granite & Highland Land Reclamation | 100% Compatible with LS & TYM PTO Systems
Operational Mastery in High-Inertia Stone Crushing
In the specialized field of agricultural land clearing, particularly within the granite-heavy terrains of South Korea’s Gangwon and Gyeongsang provinces, the central splitter gearbox acts as the critical torque management hub for tractor-mounted stone crushers. Unlike standard rotary tillers, stone crushers engage with materials—Granite, Gneiss, and Basalt—that possess compressive strengths exceeding 200 MPa.
Our T-Type central splitter gearbox is specifically engineered to handle the massive rotational inertia of the crusher rotor. When a 150HP tractor engages the PTO, the sudden torque spike can shear standard input shafts. Conversely, when the PTO disengages, the heavy rotor continues to spin. Without our integrated Heavy-Duty Freewheel (Overrunning Clutch), this stored kinetic energy would back-feed into the tractor’s transmission, causing catastrophic damage to the PTO brake bands of valuable LS Mtron or TYM tractors.
Core Functions:
- Torque Splitting: Receives 540/1000 RPM input and splits power 90° to dual side-drives (belts or chains), ensuring balanced rotor load.
- Inertial Management: The internal mechanical freewheel isolates the tractor from the implement’s momentum during deceleration.
- Thermal Stability: Designed with an expanded oil sump (4.5L capacity) to dissipate heat generated during continuous low-gear crawling operations common in Korean highland farming.
Technical Specifications: T-312 Heavy-Duty Series
Generated from our Engineering Database (Ref: KR-SPEC-2025-V4). These parameters are validated for compatibility with CAT-2 and CAT-3 hitches.
| Parameter Category | Specification / Value | Standard / Note |
|---|---|---|
| Rated Input Power | 120 HP – 180 HP (90 – 135 kW) | Continuous Duty |
| Max Input Torque | 2,450 Nm | @ 540 RPM |
| Input Speed | 540 / 1000 RPM | Dual Speed Capable |
| Transmission Ratio | 1:1.35 (Increaser) | Custom ratios available |
| Input Shaft Profile | 1-3/4″ Z6 (DIN 9611) | Splined |
| Output Shaft Profile | Ø55mm Cylindrical with Keyway | Dual Output (Left/Right) |
| Gear Material | 20CrMnTiH (Carburized) | HRC 58-62 |
| Housing Material | Ductile Iron QT450-10 | Impact Resistant |
| Oil Capacity | 4.5 Liters | Full Synthetics Rec. |
| Weight (Dry) | 85 kg | Excluding PTO guard |
| Thermal Rating | 110°C Max Operating Temp | Continuous |
| Input Rotation | Clockwise (CW) | Viewed from rear |
| Output Rotation | Counter-Clockwise (CCW) | Lateral Outputs |
| Bearing Type | Tapered Roller Bearings | SKF / NSK / Timken |
| Seal Type | Double Lip Viton (FKM) | Dust Proof |
| Breather Type | Filtered Pressure Relief | Prevents seal blowout |
| Service Factor | 2.0 (Heavy Shock Load) | AGMA Class II |
| Noise Level | < 82 dB(A) | @ 1 meter |
| Paint Finish | Epoxy Powder Coat (Blue/Grey) | Corrosion Resistance |
| Backlash | 0.15 – 0.25 mm | Precision Ground |
| Lubrication Method | Splash Lubrication | Oil bath |
| Mounting Pattern | 4x M16 Threaded Holes | Bottom Face |
| Shaft Hardness | HRC 50-55 | Induction Hardened |
| Design Life (L10) | > 5,000 Hours | @ Rated Load |
| Efficiency | 96% per stage | Bevel Gear |
| Operating Ambient Temp | -20°C to +45°C | All-Season |
| Shock Load Rating | 300% of Nominal Torque | Momentary |
| Oil Change Interval | First 50h, then every 500h | Maintenance |
| Clutch Type | Overrunning (Freewheel) | Internal |
| IP Rating | IP65 | Dust Tight / Water Jet |
Anatomy of a Korean Field-Ready Gearbox
Installation Position
The unit is mounted centrally on the stone crusher frame. It accepts the main Cardan shaft from the tractor PTO. The dual lateral shafts connect to the side transmission systems (usually belt drives to dampen vibration or heavy-duty chains for maximum torque) which spin the main rotor.
Working Principle: The “Power Split”
The input bevel gear (pinion) drives a large ring gear. This ring gear is mounted on a through-shaft (cross shaft). However, unlike a simple differential in a car, this is a solid locked drive ensuring both sides of the heavy rotor spin at the exact same speed to prevent jamming. The integrated freewheel is situated between the input spline and the pinion gear, allowing the input to stop while the gears coast.
South Korea Specific: Terrain & Compliance
Granite Terrain Adaptation
South Korean soil, especially in Gangwon-do and mountainous areas of Gyeongsangbuk-do, is composed of over 70% granite and gneiss. Standard European gearboxes often fail here due to casing cracks caused by high-frequency vibration during rock crushing. EVER-POWER gearboxes utilize QT450-10 Ductile Iron casings which offer 40% higher tensile strength than standard Grey Iron, specifically to withstand the “shattering” impact of Korean granite.
KC & Safety Compliance
While gearboxes as standalone components do not require the KC mark, the machinery they power does. Our agricultural gearboxes are fully compliant with the safety requirements of the Occupational Safety and Health Agency (KOSHA) standards for agricultural machinery. We provide all necessary technical files (drawings, material certs) to assist Korean OEMs in obtaining their S-Mark or KC safety certification for the final stone crusher assembly.
Local Tractor Compatibility
Our input shafts are machined to strict ISO 500 standards, ensuring a perfect fit with the PTO output of popular South Korean tractors including:
- LS Mtron: XP, MT7 series (1-3/4″ Z6 or Z20 splines).
- TYM: T1104, T1304 heavy utility tractors.
- Daedong (Kioti): HX Series.
From the Chief Engineer’s Desk
“When we designed the T-312 for the East Asian market, we noticed a recurring failure mode in imported Italian gearboxes used in Korea: the ‘breather clogging’ issue. The fine silica dust from crushing granite creates a cement-like paste when mixed with oil mist, clogging standard breathers. This leads to internal pressure buildup and seal failure.
Our Innovation: We implemented a ‘Labyrinth Shield’ breather cap with a sintered bronze filter element. Even in the dustiest dry-season operations in rural Korea, the gearbox ‘breathes’ clean air, keeping the Viton seals intact and the oil inside where it belongs. It’s a small detail, but it doubles the service life in granite conditions.”
— Dr. H. Chen, Lead Transmission Engineer
Market Comparison: EVER-POWER vs. Standard Options
| Feature | EVER-POWER Heavy Duty | Generic Competitor (Standard) |
|---|---|---|
| Housing Material | Ductile Iron (QT450) – Shock Proof | Grey Cast Iron (HT250) – Brittle |
| Sealing System | Double Lip Viton + Dust Shield | Single Lip NBR |
| Gear Precision | DIN Class 6 (Ground) | DIN Class 8 (Shaved) |
| Freewheel | Integrated, 6-Pawl Heavy Duty | External or Optional |
*Disclaimer: All comparisons are based on internal laboratory testing against standard generic market equivalents. Competitor trademarks are the property of their respective owners and are used here for reference purposes only.
Global Success Stories: Solving the “Impossible”
Case Study 1: The Gangwon-do Granite Challenge (South Korea)
Client Profile: A land reclamation contractor in Pyeongchang, Gangwon-do.
The Pain Point: “Every time we hit a buried granite boulder with our 2.5m crusher, the shear bolt on the PTO shaft would break, but the shockwave was still cracking the gearbox mounting feet. We were replacing gearboxes every 3 months.”
EVER-POWER Solution: We supplied the T-312 model with a reinforced “monoblock” ductile iron casing and customized the mounting pattern to include rubber vibration dampeners. We also adjusted the backlash to 0.25mm to allow for thermal expansion during 10-hour shifts.
Outcome: “It’s been two seasons (18 months) without a single crack. The housing takes the beating that destroyed the Italian units.”
Case Study 2: Hokkaido Volcanic Rock (Japan)
Client Profile: Agricultural cooperative converting forest to potato fields.
The Pain Point: “Volcanic rock is abrasive. Dust was destroying our seals in weeks, causing oil leaks and gear seizures.”
EVER-POWER Solution: Implementation of the ‘Labyrinth Shield’ breather and SKF Mudblock seals.
Outcome: Maintenance intervals extended from weekly checks to monthly. Zero seal failures in the first year.
Case Study 3: Forestry Mulching (Germany)
Client Profile: Municipal road maintenance in Bavaria.
The Pain Point: Overheating during summer operations clearing roadside stumps.
EVER-POWER Solution: We added external cooling fins to the casting design, increasing surface area by 30%.
Outcome: Operating temperature dropped from 115°C to a stable 85°C.
When to Replace Your Stone Crusher Gearbox?
- 1. Metallic Shimmer in Oil: If your oil change reveals “gold dust” (brass) or silver flakes, your bearings or gears are in late-stage failure.
- 2. Excessive “Backlash” (Play): Turn the input shaft by hand. If it rotates more than 5-10 degrees before the output shaft moves, the gear teeth are worn thin and liable to snap under shock load.
- 3. Case Weeping: Oil spots appearing on the casting body (not the seals) indicate micro-fractures in the housing from impact fatigue. Immediate replacement is required to prevent casing explosion.
Frequently Asked Questions
Q1: Can this gearbox replace the Comer or Bondioli gearboxes on my existing stone crusher?
Yes. Our T-312 series utilizes standard mounting patterns and shaft dimensions (1-3/4″ Z6 input). We offer drop-in replacements for major European brands. Please share your model number for a cross-reference check.
Q2: Do you support small orders for testing in Korea?
We understand the need for validation. We accept sample orders (MOQ 1 unit) for OEMs and large contractors to test in local soil conditions before committing to bulk shipments.
Q3: How do you handle the high shipping weight?
These units are heavy (~85kg). We crate them in reinforced plywood boxes compliant with ISPM 15. We ship LCL or FCL to Busan or Incheon ports regularly.
Q4: Is the freewheel serviceable?
Yes, the internal freewheel is a modular cassette design. It can be replaced without replacing the entire gear set, significantly reducing long-term maintenance costs.
Q5: What oil do you recommend for Korean winters?
For operations in Gangwon-do where temps drop below -15°C, we recommend a synthetic 75W-90 gear oil. For summer-only operations, 85W-140 is preferred for better film strength.
Q6: Do you provide 3D CAD models for our design team?
Absolutely. We provide STEP/IGES files to OEM engineers to ensure the gearbox fits perfectly within your machine’s chassis constraints.
Q7: What is the warranty period?
We offer an 18-month warranty on the main housing and gear set, and 12 months on seals and bearings, subject to proper maintenance logs.
Q8: How quickly can you ship spare parts?
We maintain a stock of critical spares (seal kits, freewheel cassettes, shafts) and can courier them via DHL/FedEx to Korea within 3-5 business days.
Complete Drivetrain Solutions
Don’t stop at the gearbox. Ensure your entire power transmission line is bulletproof.
Friction Clutch PTO Shafts
Protect your gearbox from granite shock loads with our preset friction clutch PTO shafts. Essential for stone crushers.
Drive Chains & Sprockets
High-tensile sidebar chains for side transmission. Resistant to dust and stretching.
Ready to Upgrade Your Fleet?
From Seoul to Busan, EVER-POWER is the trusted partner for heavy-duty agricultural transmission systems. Stop downtime before it starts.
