Specifications
| Item | Value |
|---|---|
| Material | Carbon steel AISI 1045 / S355J2 / GS-45; alloy steel 42CrMo (AISI 4140) for high torque units |
| Process | Silica sol lost wax investment casting; water glass lost wax for oversized low-cost housings |
| Dimensional tolerance | ISO 8062 CT4-CT6 (silica sol); CT6-CT8 (water glass); machined bores to ISO 2768-m or drawing callout |
| Surface finish | Ra 3.2-6.3 um as-cast; Ra 1.6 um on CNC machined bearing and sealing faces |
| Machining | CNC machining of input and output bearing bores, oil seal seats, cover face, drain and breather ports, bolt hole circles |
| Weight range | 4.5-22 kg per housing |
| Inspection & certificates | EN 10204 3.1 material certificate, CMM dimensional report, hardness test, magnetic-particle inspection on load-bearing sections, salt-spray testing per ISO 9227, PPAP/FAIR on request |
Key features
- One-piece investment cast housing replaces multi-plate weldments and eliminates weld-seam oil leakage paths.
- Bearing bores and oil seal seats finish machined on CNC vertical lathes with concentricity held to the drawing.
- 42CrMo quench and temper option raises torque capacity for stone-burdened and heavy clay soils.
- Cast-in ribs and bosses are placed to stiffen the gear centre distance under shock load from rotor blades.
- Water glass lost wax route available for large housings where tooling cost must stay low at 300-1,500 pieces per year.
- As-cast surfaces shot blasted to Sa 2.5 and supplied primed, powder coated or wet painted to customer colour.
Applications
- Rotary tillers and power harrows for compact and utility tractors from 25 to 120 hp.
- Reverse-rotation tiller gearboxes for orchard and vineyard tractors.
- Stone-burden cultivator and rotary cultivator drives.
- Combine-mounted and trailed rotary tillage units.
- Municipal and greenhouse soil preparation machines.
- OEM spare-part programmes for tiller gearbox service kits.
Quality and compliance
Ningbo Ruican casts and machines rotary tiller gearbox housings under an IATF 16949 and ISO 9001 certified quality management system. Every heat is traceable to its melt record and is delivered with an EN 10204 3.1 material certificate covering chemical composition and mechanical properties. PPAP and FAIR documentation are prepared on request for new part introductions, and heat-lot traceability is maintained from charge material through heat treatment to final packing. Hardness testing is performed on every heat-treated batch, salt-spray exposure testing per ISO 9227 qualifies the coating system, and magnetic-particle inspection is applied on load-bearing sections where the drawing or customer specification calls for it.
FAQs
What is the minimum order quantity for a rotary tiller gearbox housing?
Tooling-led production normally starts at 300 pieces per part number. For prototyping and field testing we supply 5-20 pieces from a soft tool or from machined cast blanks before the production tool is released.
Can you machine the gearbox housing complete?
Yes. We CNC machine the bearing bores, oil seal seats, mounting face, breather and drain ports and the bolt hole circle, so the housing arrives ready for gear, shaft and bearing assembly.
Which material do you recommend for high-torque tillers?
42CrMo (AISI 4140) in the quenched and tempered condition is our standard recommendation above roughly 900 Nm of output torque. AISI 1045 covers most standard-duty compact tractor tillers at lower cost.
Do you supply the mating cover and gear set?
We supply the cast and machined housing and cover. Gears, shafts and bearings are sourced or supplied free-issue to customer drawings; we can assemble complete gearboxes on a project basis.
How do you control leakage at the oil seal face?
The seal seat is finish machined to Ra 1.6 um with a controlled lead angle, and every housing is pressure or air-decay leak tested when the drawing specifies it.
What coating options are available?
Standard options include two-component epoxy primer, powder coating and wet paint in customer RAL colours, all validated by ISO 9227 salt-spray testing to the agreed hour requirement.
