Heavy-Duty Gear Bushings
for Extreme Powertrains
Engineered to survive high radial loads, combat gear galling, and maximize transmission uptime. In heavy-duty agricultural, construction, and commercial gearboxes, standard bearings are destroyed by severe shock loads and marginal lubrication. JBM manufactures premium bimetal, sintered bronze, and steel-backed composite gear bushings engineered specifically for the world's most demanding drivetrains. As a direct-to-factory partner, we provide OEM-level replacements and custom manufacturing for aftermarket distributors, master rebuilders, and Tier-1 suppliers globally.
Technical Specifications & Material Data
Stop guessing with aftermarket plastics. We provide full material transparency so your engineering team can specify the exact bushing for the required torque, speed, and thermal environment.
Bimetal Series — Steel Shell + CuPb10Sn10 / Lead-Free Bronze
Our flagship material for planetary gears and main shafts. The steel backing handles the structural stress, while the sintered bronze layer absorbs microscopic shaft deflections and embeds foreign contaminants.
| Technical Parameter | Specification Value |
|---|---|
| Max Load (Static) | 250 N/mm² |
| Max Load (Dynamic) | 140 N/mm² |
| Breaking Load | 350 N/mm² |
| Max Speed (Lubricated) | 2.5 m/s |
| Max PV Limit | 2.8 N/mm²·m/s |
| Alloy Hardness | ≥ HB 70 |
| Temperature Limit | -40 °C to +250 °C |
| Friction Coefficient (µ) | 0.05 – 0.20 |
| Thermal Conductivity | 60 W/(m·K) |
| Coefficient of Thermal Expansion | 14 × 10⁻⁶ K⁻¹ |
Steel-Backed PTFE/POM Composites — DU / DX Equivalents
Perfect for oil pump gears, thrust washers, and internal linkages requiring ultra-low friction during dry-starts or boundary lubrication conditions.
| Technical Parameter | Specification Value |
|---|---|
| Max Load (Static) | 250 N/mm² |
| Max Load (Very Low Speed) | 140 N/mm² |
| Max Load (Rotating/Oscillating) | 60 N/mm² |
| Max PV (Dry Running, Short Term) | 3.6 N/mm²·m/s |
| Max PV (Dry Running, Continuous) | 1.8 N/mm²·m/s |
| Max Speed (Dry Running) | 2 m/s |
| Max Speed (Hydrodynamic) | > 2 m/s |
| Temperature Limit | -195 °C to +280 °C |
| Friction Coefficient (µ) | 0.03 – 0.20 |
| Thermal Conductivity | 42 W/(m·K) |
| Coefficient of Thermal Expansion | 11 × 10⁻⁶ K⁻¹ |
Heavy-Duty Solid Cast & Sintered Bronze
Ideal for high-impact applications like transfer cases, intermediate shafts, and PTO (Power Take-Off) gears where heavy shock loads occur.
| Technical Parameter | Solid Cast Bronze (CuSn8) | Sintered Bronze (Oil-Impregnated) |
|---|---|---|
| Max Static Load | 120 N/mm² | 50 N/mm² |
| Max Dynamic Load | 40 N/mm² | 10 N/mm² |
| Max Sliding Speed | 2.5 m/s (Grease/Oil) | 5.0 m/s (Hydrodynamic) |
| Temperature Limit | -100 °C to +200 °C | -80 °C to +160 °C |
| Porosity (Oil Content) | N/A (Requires External Lube) | 18% – 25% Volume |
| Friction Coefficient | 0.08 – 0.25 | 0.05 – 0.15 |
Engineered for Critical Gearbox Locations
Different gears experience unique stress profiles. We machine solutions tailored to specific drivetrain nodes.
Planetary Gear Bushings
Designed to prevent deformation under peak torque and extreme crushing forces inside the planetary carrier. Bimetal construction distributes load evenly across the steel backing, preventing bronze layer fatigue.
Idler / Intermediate Gear Bushings
Machined with precise internal clearances to accommodate thermal expansion during continuous high-speed rotation. Available with diamond oil pockets for optimal lubricant retention.
See full Idler Gear Guide →PTO (Power Take-Off) Bushings
Built to withstand the sudden engagement shocks typical in agricultural harvesters, MTZ tractors, and hydraulic-driven implements. High impact resistance is critical here.
Transmission Oil Pump Bushings
High-concentricity composites ensuring perfect fluid seals and maintaining critical hydraulic line pressure. Ultra-low friction PTFE layer prevents scoring during cold-start conditions.
See full Transmission Guide →Custom Machining & Fluid Dynamics
For a gear bushing to survive, lubrication must be maintained. JBM offers advanced custom machining to ensure boundary and hydrodynamic lubrication.
Precision Oil Grooves
We CNC-machine custom oil distribution grooves — including Figure-Eight (8), Straight, Diamond pockets, and Circular grooves — to guarantee continuous gear oil flow across the sliding surface.
Interference Fit Guarantees
Our wrapped and solid bushings are manufactured to exact ISO 3547 tolerances. We maintain strict control over Outer Diameter (O.D.) to ensure a secure press-fit into the gear bore without spinning.
No Line-Boring Needed
High-precision Wall Thickness control means our bushings are "drop-in" ready, saving rebuilders hours of costly secondary machining on the shop floor.
OEM Cross-Reference for Heavy Machinery
We reverse-engineer and mass-produce direct replacements for legacy and modern agricultural/heavy-duty applications.
| Equipment Type | Common Application | JBM Upgraded Material |
|---|---|---|
| MTZ (Belarus) Tractors | Gearbox Intermediate Shaft | JBM-800 Bimetal Series |
| KhTZ / Kirovets | Reduction Drive / Axle | JBM-650 High-Load Solid Bronze |
| John Deere / Case IH | Planetary Drives | JBM-820 Lead-Free Bimetal |
| Eaton Fuller / Allison | Heavy Truck Main Shaft | JBM-800 Tin-Plated Bimetal |
| CAT / Komatsu | Final Drive & Transfer Case | JBM-090 Wrapped CuSn8 |
| KAMAZ / YaMZ | Timing Gear Train | JBM-800 Bimetal Series |
Custom Runs
Have a worn sample or an obsolete OEM part number? Send us your technical drawings. Our R&D team can mass-produce exact dimensional matches with custom tolerances.
Stop paying catalog prices for individual pieces
We manufacture heavy-duty gear bushings in volume directly for OEM assembly lines, agricultural equipment rebuilders, and Tier-1 gearbox suppliers — shorter lead times, lower per-unit cost, exact OEM dimensions.
Engineering FAQ
Why choose bimetal over solid bronze for planetary gears?
Can you manufacture gear bushings with custom oversized outer diameters?
Do you supply shift linkage and cable bushings for the aftermarket?
Recommended Gear Bushing Products
Related Application Guides
Need Heavy-Duty Gear Bushings? Let's Talk.
Whether you're rebuilding agricultural gearboxes or supplying Tier-1 transmission manufacturers — send us your part numbers, drawings, or worn samples. Engineering response within 24 hours.
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