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Heavy-Duty Agricultural Blades
Engineered for the toughest fields. As a specialized manufacturer of aftermarket Kubota machinery parts, PRR delivers blades that offer the perfect balance of hardness and toughness. Whether for finish mowers or rotary cutters, our blades ensure a clean cut and extended service life.
Technical Specifications (Drive System & Gearbox)
The performance of a blade is directly tied to the drive system. Below are the standard specifications for Gearboxes used in Kubota-compatible cutting decks (RCK/ZD Series).
| Parameter Specification | Standard Data (Compatible with Kubota Mowers) |
|---|---|
| Input Power Rating | 20 HP - 80 HP (Dependent on deck width) |
| Standard Gear Ratio | 1:1.47 (Standard) or 1:1.92 (High Speed) |
| Input Shaft Profile | 1-3/8" Z6 (6-Spline) Standard PTO |
| Housing Material | Ductile Iron (QT450) or Grey Iron (HT250) |
| Output Shaft Type | Tapered Spline (12-Spline) with Castle Nut |
| Gearmateriale | 20CrMnTi Alloy Steel (Carburized & Quenched) |
| Smøring | SAE 90 / 80W-90 Gear Oil (0.8L - 1.2L Cap.) |
| Peak Torque Load | 650 Nm - 900 Nm |
| Blade Tip Speed | 15,000 - 18,000 FPM (Feet Per Minute) |
| Mounting Pattern | Universal 4-Bolt Square Flange |
What are Agricultural Blades?
Agricultural blades are the primary working element of rotary cutters, finish mowers, and flail mowers. They are designed to spin at high velocities to slice through vegetation.
Commonly used in Kubota machinery (like the ZD series zero-turns or M-series tractors), these blades work in conjunction with other critical components:
- Transmission Shafts: Transfer power from the tractor to the deck.
- Blade Spindles: The housing that holds the blade and bearings.
- Ball Ends: Often found in the lift linkage system.
At PRR, we provide a complete range of cutting parts that are fully compatible with OEM standards, offering a cost-effective solution without sacrificing quality.
Our Blade Series
Precision Crafted. Heat Treated. Ready for Work.
Standard Lift Blade
High-Lift Mulching Blade
Offset Rotary Cutter Blade
Precision Finish Blade
Working Principle & PRR Advantage
Blades operate by converting rotational torque from the Gears into high-speed shearing force. The aerodynamic design ("Lift") creates a vacuum that pulls grass upright before cutting, ensuring a level finish.
Why Choose PRR Replacements?
- Material Mastery: We use 60Si2Mn Spring Steel or Boron Steel, far superior to standard carbon steel in resisting fractures.
- Cost Efficiency: High-quality aftermarket parts at 40-50% less than dealership prices.
- Perfect Fit: CNC machined mounting holes ensure 100% compatibility with Kubota spindles.
- Hardening: Induction hardened edges (HRC 48-55) keep the blade sharp longer, even in sandy soil.
We also supply Ball Ends and Linkage Parts
Maintenance & Care
- Sharpening: Keep edges sharp. A dull blade tears the grass, causing yellowing and disease susceptibility.
- Balancing: Crucial. An unbalanced blade will destroy your spindle bearings and gearbox seals within hours. Always use a balancer after sharpening.
- Torque Specs: Check blade bolt torque every 50 hours. Loose blades can shear off retaining pins.
- Rensning: Remove caked-on mud from the blade surface to prevent rust and imbalance.
How to Select the Right Gearbox
When replacing the Gearkasse for your blade system, verify these points:
Ofte stillede spørgsmål
Are PRR blades compatible with Kubota RCK60 mower decks?
Yes. We manufacture blades that meet the exact dimensional specifications (length, width, center hole size) of the RCK60, RCK54, and RCK72 series decks.
How often should I replace my mower blades?
For commercial use, inspect daily. Replace them when the "lift" wing becomes thin or cracked, or when the cutting edge can no longer be sharpened effectively (usually every 1-2 seasons depending on usage).
What is the difference between High-Lift and Low-Lift blades?
High-lift blades create strong suction to bag grass or discharge it far. Low-lift blades are used for sandy soil to reduce dust and wear.
Why do my new blades vibrate?
Vibration usually means the blade is unbalanced or the mounting surface (spindle) is bent. Ensure the blade is centered correctly on the pilot.
Can I weld a cracked blade?
Never. Welding ruins the heat treatment, making the steel brittle. A welded blade can shatter at high RPM, becoming a lethal projectile.
Do you sell Mulching Blades?
Yes, we offer mulching blades with an extended cutting edge and curved profile to chop grass into fine particles that decompose quickly.
What other parts do I need when changing blades?
We recommend replacing the blade bolt and washer. If the spindle is noisy, you may need to replace the bearings or the entire assembly.
Do you supply 3-Point Hitch parts?
Yes, check our 3-punkts anhængertræk passer page for stabilizers, top links, and lift arms compatible with Kubota tractors.
Are your parts ISO certified?
Yes, our factory operates under ISO 9001 quality management standards, ensuring consistent hardness and dimensions.
Do you ship internationally?
Yes, PRR specializes in global export. We can ship blades, sprockets, and gearboxes to almost any country.
