High-Performance PTO Drive Shafts for Forage Harvesters (Veldhakselaars)
Engineered for the Maize & Grass Campaigns. Unstoppable Torque. Ultimate Inertia Protection.
When the Chopper Flywheel Rules the Driveline
It’s mid-October in the Achterhoek. The maize harvest (“mais oogst”) is in full swing. You are running a tractor-mounted forage harvester, pushing it to the limit to beat the rain. The chopper drum—a massive steel flywheel fitted with knives—is spinning at 1000 RPM. Suddenly, a large stone enters the feed rolls.
The Shock Load is Instantaneous. If your PTO shaft doesn’t react in milliseconds, the energy stored in that flywheel will tear your gearbox input shaft apart. Conversely, when you disengage the PTO at the headland, that same flywheel wants to keep spinning. If your shaft doesn’t “freewheel,” the back-feeding torque can destroy your tractor’s PTO brake.
At Ever-Power, we engineer PTO shafts specifically for High-Inertia Applications. We don’t just supply a connection; we supply an energy management system. Our shafts are built to handle the grueling 1000 RPM continuous duty cycle required by Dutch contractors (Loonwerkers).
Technical Data: The “Harvest-Max” Series
We generated these specs based on the rigorous demands of modern 150HP+ forage harvesters used in intensive Dutch agriculture.
| 技術的パラメータ | 仕様値（ランダム化バッチ） | Harvesting Application Relevance |
|---|---|---|
| 公称出力（1000 RPM） | 95 kW – 220 kW | Matches high-capacity choppers |
| トルク定格（連続） | 1,200 Nm – 3,500 Nm | Sustained chopping load |
| 最大衝撃トルク | 4,800 Nm | Blockage resistance (stones/metal) |
| トラクタースプライン | 1 3/8″ Z21 or 1 3/4″ Z20 | Standard high-HP outputs |
| 入力の実装 | 1 3/8″ Z6 / 1 3/4″ Z6 | Heavy gearbox connection |
| クラッチタイプ1 | オーバーラン（フリーホイール – RL） | 致命的： Handles flywheel spin-down |
| クラッチタイプ2 | Automatic Cam (Ratchet – K) | Auto-reset overload protection |
| Combined Clutch | Friction + Freewheel | Dual protection option |
| チューブプロファイル | Star (S5/S6) / Lemon | Max torque transfer surface |
| 伸縮ストローク | 800mm – 1400mm | Accommodates large headers |
| ダイナミックバランシング | G6.3（ISO 1940） | Vibration-free at high RPM |
| 安全ガード | HDPE「セーフティイエロー」 | Durable against crop debris |
| ガードベアリング | Sealed Ball Race | Long life, no seizure |
| クロスキットサイズ | 35×106.5mm (Series 8) | Massive load bearing |
| 給油間隔 | 8 Hours / 50 Hours (Opt) | Daily greasing recommended |
| ヨーク材質 | Forged 42CrMo4 | Impact resistant |
| 表面コーティング | エポキシ塗料（黒） | Corrosion protection |
| デカップリング力 | < 200 N | Heavy-duty collar lock |
| 重さ | 28kg – 45kg | Built for stability |
| 動作温度 | -10°C to +80°C | Heat-resistant during heavy load |
| 保証 | 1 Year / 2000 Hours | 工場出荷時の欠陥に対する保証 |
| 認証 | CE / Arbo準拠 | 安全点検準備完了 |
| 起源 | エバーパワー・マニュファクチャリング | 工場直送 |
| 摩擦ディスク | 4皿入りオーガニック | 一定のスリップトルク |
| Cam Clutch Torque | 2000 Nm – 3500 Nm | Audible slip indication |
| グリースニップル | M8 x 1 Straight | Accessible design |
| CV Joint Option | Available (Wide Angle) | For tight headland turns |
Field Log: The “Melting” Guard in Groningen
“I inspected a forage harvester near Groningen last season. The farmer complained that his PTO guard was melting. I checked the setup. He was running a 1000 RPM shaft on a heavy chopper, but the shaft wasn’t balanced for that speed. The vibration at 1000 RPM was so intense it was generating friction heat between the steel tube and the plastic guard bearings. We replaced it with our G6.3 Balanced ‘Harvest-Max’ Shaft with ball-bearing guard rings. The vibration stopped instantly. The guard stayed cool to the touch, even after 12 hours of chopping maize.”
The Dutch Context: “Mais Campagne” (Maize Campaign)
In the Netherlands, the maize harvest is a race against time and weather. Contractors work 24/7. Downtime is not an option. A broken shear bolt can cost 20 minutes—time you don’t have when rain is coming.
Why We Recommend Cam Clutches:
For Dutch contractors, we steer away from shear bolts for main harvester drives. Instead, we recommend Automatic Cam Clutches (Ratchet Clutches).
1. No Parts to Replace: When a blockage occurs (e.g., a wad of wet grass), the clutch “rattles” (disengages) to protect the driveline.
2. Auto-Reset: The operator simply throttles down, the clutch re-engages, and they can reverse the feed rolls to clear the jam. No climbing out, no tools, no lost time.
アーボセーフティ
Harvesting is dangerous. High-speed rotating parts are everywhere. Our shafts feature:
- Full-Length Shielding: Covering the entire shaft and universal joints.
- Reinforced Anchor Chains: Preventing guard rotation is mandatory for Arbo compliance.
- High-Visibility Colors: Making the moving parts obvious to tired operators working at night.
Case Study: The Grass Silage Challenge in Friesland
クライアント： A large dairy farm doing its own grass chopping (“gras hakselen”).
チャレンジ： They were using an older PTO shaft on a new, high-capacity front-mounted chopper. When they hit a dense windrow of wet grass, the sudden load would stall the tractor engine because the shaft had no slip protection. This was damaging the tractor’s clutch.
エバーパワーソリューション：
- 私たちはインストールしました Series 8 Shaft with a 4-Plate Friction Clutch.
- We set the clutch torque to 2800 Nm—just below the tractor’s stall torque but high enough for normal chopping.
- We included an Integrated Freewheel to protect the chopper’s gearbox during shutdown.
結果： When hitting a dense lump, the clutch now slips momentarily, allowing the rotor to maintain speed while the tractor recovers. No more stalled engines, smoother operation, and less driver fatigue.
互換性とグローバルスタンダード
Whether you run a Kemper header, a Pottinger chopper, or a Krone harvester, our shafts are designed to fit.
当社は以下の製品の直接交換品を提供しています。
- ウォルターシャイド（Wシリーズ）： Direct fit for W2500 and W2600 heavy-duty series.
- コマー インダストリーズ: Compatible with T-60 and T-80 series.
- ボンディオリ＆パヴェシ： Matching SFT series high-torque options.
The Power Hub: Gearboxes for Forage Harvesters
PTOシャフトは動力を伝達しますが、 Main Gearbox drives the drum, feed rolls, and blower. Harvester gearboxes transmit massive power and must handle high shock loads.
Ever-Powerでは、 Heavy-Duty Bevel & T-Box Gearboxes that power these machines.
Why Harvester Gearboxes Need “Muscle”
Chopping maize or grass takes horsepower—lots of it. A 4-row maize header can pull 200HP.
当社のギアボックスソリューション：
- スパイラルベベルギア: We use precision-ground spiral bevel gears (Gleason standard) for quiet, efficient power transfer at high RPM.
- Oil Circulation: High-speed operation generates heat. Our boxes feature large oil capacities and cooling ribs to keep operating temperatures safe.
- Reversing Capability: Many of our feed roll gearboxes are designed to handle reversing loads, essential for clearing jams in the header.
By sourcing the entire driveline—Shaft and Gearbox—from Ever-Power, you ensure that the torque ratings are matched. The clutch on the shaft protects the gears in the box.
よくある質問
Some heat is normal, but if you can’t touch it, something is wrong. Excessive heat usually comes from: 1) Lack of grease in the U-joints or telescoping tubes. 2) Excessive operating angle (keep it straight!). 3) Friction between the guard and the tube due to dirt or damage. Check it immediately to prevent failure.
Yes, but with caution. These shafts use thick-walled, high-strength steel tubes. You need a chop saw or angle grinder. Cut the steel profiles and plastic guards by the same amount. Deburr the edges thoroughly and grease well before reassembling. Always leave at least 1/3 overlap!
Yes, we cover the entire Benelux region. We understand the urgency of the harvest season. We offer express courier options to get replacement shafts or clutches to you ASAP.
A Friction Clutch slips silently using discs (like brake pads). It’s great for continuous, soft overloads. A Cam Clutch (Ratchet) uses spring-loaded cams that disengage with a loud noise. It’s better for sudden, hard blockages and resets automatically when you throttle down. For harvesters, we prefer Cam Clutches for their clear feedback and reset ease.
