Overview — Sprockets for Tractors
From the wheat belts of Western Australia to the cane fields of Queensland, tractors are the backbone of Australian farming. Chain-and-sprocket drives on tractors power a wide range of functions: PTO-driven implements, front-end loader tilt mechanisms, seed-drill metering units, and auxiliary hydraulic pump drives.
Ever-Power Australia Sprockets Co., Ltd. manufactures tractor sprockets from hardened carbon and alloy steels, purpose-built for the dust, mud, vibration, and variable loads that define agricultural work. Our sprockets are compatible with all major tractor brands operating in Australia and come with sealed-hub options to keep dirt out of the bore.
Technical Specifications
| Parameter | Standard | Custom |
|---|---|---|
| Chain Pitch | 3/8″ – 1-1/2″ (ANSI 35–120) | Up to 2″ |
| Teeth | 9 – 60 | Up to 100 |
| Strand | Simplex / Duplex | Triplex |
| Hub | Type A / B / QD / Taper | Weld-on |
| Bore | 15 mm – 80 mm | Up to 130 mm |
| Material | C45 / 40Cr | SS / Manganese |
| Hardness | HRC 40–50 | HRC 58 carburised |
| Surface | Zinc / Black Oxide | Dacromet / Geomet |
| PCD | 40 mm – 700 mm | Up to 1200 mm |
| Profile | ANSI B29.1 / ISO 606 | Modified agricultural |
| Max RPM | 800 | 1,500 |
| Temp | –25 °C to +100 °C | –40 °C to +150 °C |
| Keyway | DIN 6885 / Woodruff | Spline / Hex bore |
| Bore Tolerance | H7 | H6 |
| TIR | ≤ 0.06 mm | ≤ 0.03 mm |
| Dust Resistance | Sealed hub option | Full-seal labyrinth |
| Tensile | ≥ 620 MPa | ≥ 900 MPa |
| Fatigue | ≥ 10,000 hrs | ≥ 20,000 hrs |
| Corrosion | 200 hr salt spray (zinc) | 1000 hr (Dacromet) |
| Packaging | Anti-rust + poly bag | OEM retail box |
Performance Advantages
🌱 Dust-Sealed Hubs
Optional labyrinth seals and O-ring grooves prevent fine Australian soil from entering the bore-key interface, avoiding the shaft wear that sidelines tractors during harvest.
💪 Induction-Hardened Teeth
HRC 48 tooth tips resist the impact and abrasion of agricultural chain drives while the tough core absorbs shock from implement engagement — 2–3× the life of untreated sprockets.
❌ Cheap Sprocket Pitfall
Budget agricultural sprockets use soft steel with no heat treatment. Teeth wear in one season, chains stretch, and the whole drive system needs premature replacement — mid-harvest.
How Sprockets Work on Tractors
Tractors use chain-and-sprocket drives in several key areas:
▸ PTO-driven implements: The tractor’s Power Take-Off (PTO) shaft turns at 540 or 1,000 RPM. A sprocket on the PTO output transmits power via roller chain to the implement’s input shaft — powering mowers, rotary hoes, manure spreaders, and balers.
▸ Front-end loader tilt mechanism: Some loaders use a chain-and-sprocket system to tilt the bucket. The sprocket converts hydraulic cylinder linear motion into bucket rotation.
▸ Seed-drill metering: Precision sprockets on the seed drill’s ground-drive shaft regulate seed placement rate by controlling the metering mechanism’s rotation.
▸ Track drive (crawler tractors): On tracked units like the Cat Challenger series, large drive sprockets engage the track chain, propelling the machine.
Compatibility
| Application | Chain Types | Tractor Brands* |
|---|---|---|
| PTO Drive | ANSI 50–80, BS 10B–16B | John Deere, Case IH, New Holland |
| Loader Mechanism | ANSI 60–100 | Kubota, Massey Ferguson, Fendt |
| Seed Drill Ground Drive | ANSI 35–50, Double Pitch | Horwood Bagshaw, John Shearer |
*Brand names for selection convenience only. No affiliation.
📊 PTO Speed / Sprocket Ratio Quick Reference
| PTO Speed | Drive Sprocket Teeth | Driven Sprocket Teeth | Implement Speed |
|---|---|---|---|
| 540 RPM | 15 | 30 | 270 RPM (2:1) |
| 540 RPM | 17 | 17 | 540 RPM (1:1) |
| 1000 RPM | 13 | 39 | 333 RPM (3:1) |
| 1000 RPM | 15 | 21 | 714 RPM (1.4:1) |
Selection Guide
- Determine the chain pitch and strand from the implement or tractor manual.
- Count teeth on existing sprocket or calculate ratio from PTO-to-implement speed requirement.
- Measure bore and keyway (PTO output shafts are standardised: 35 mm 6-spline or 45 mm 20-spline).
- Assess environment: dusty paddock, irrigated field, coastal salt air.
- Choose hub type: QD for implements changed seasonally; taper lock for permanent installations.
Our agricultural specialists can cross-reference any tractor implement sprocket.
Installation
- Disengage PTO and shut down tractor engine. Remove implement PTO guard.
- Release chain tension via the implement’s adjuster.
- Break chain and remove old sprocket from shaft.
- Clean shaft; remove dirt, rust, and old grease. Inspect for wear.
- Fit new sprocket; engage keyway or spline correctly. Tighten set screws or QD bushing.
- Re-route chain and connect with new master link.
- Adjust chain tension: 10–15 mm deflection per 300 mm span.
- Lubricate chain with agricultural-grade chain oil.
- Replace PTO guard and all safety shields before starting.
- Run at low PTO speed for 2 minutes; check for noise, vibration, and chain tracking.
Troubleshooting
Chain thrown off during heavy load
Cause: Insufficient tension or worn sprocket teeth. Fix: Re-tension; replace sprocket if tooth wear exceeds 0.5 mm.
Uneven power delivery to implement
Cause: Sprocket bore worn loose on PTO shaft. Fix: Replace sprocket; machine new keyway if shaft damaged.
Rapid chain wear in dusty conditions
Cause: Abrasive soil entering chain joints. Fix: Install chain guards; switch to sealed-hub sprockets; increase lubrication frequency.
Sprocket set screw backing out
Cause: Vibration from rough paddock conditions. Fix: Apply thread locker (Loctite 242); switch to taper-lock hub for positive retention.
Excessive noise from PTO drive
Cause: Misaligned sprockets or chain too tight. Fix: Re-align; adjust to correct 10–15 mm deflection.
Case Studies
📍 Moree, NSW — Broadacre Wheat Farm
John Deere 8R tractor running a 12 m air seeder. Drive sprocket wearing out every season.
Result: Induction-hardened 19T sprocket with sealed QD hub. Lasted 3 seasons without replacement.
“Three seasons from one sprocket is unheard of on our black soil.” — Farm Owner
📍 Toowoomba, QLD — Cattle Property
Kubota M7 running a round baler. Baler input sprocket shearing set screws.
Result: Taper-lock 21T sprocket with grade 12.9 bolts. Zero set-screw failures in 2 baling seasons.
“No more stopping mid-paddock to re-tighten. Simple and effective.” — Grazier
📍 Esperance, WA — Mixed Cropping
Case IH Magnum with precision seed drill. Ground-drive sprocket ratio change needed for canola.
Result: Supplied quick-change sprocket set (15T/21T) for wheat-to-canola swap. Changeover time: 20 minutes.
“Being able to swap sprockets in the paddock saved half a day per sowing changeover.” — Agronomist
📍 Shepparton, VIC — Orchard Irrigation
Tractor-driven water pump, ANSI 60 chain. Sprocket corroding due to spray irrigation moisture.
Result: Dacromet-coated sprockets. 14-month life vs. 5-month previous. No mid-season failures.
“Finally a sprocket that handles the constant moisture.” — Orchard Manager
📍 Murray Bridge, SA — Hay Contractor
Fendt 700 running a large square baler. PTO drive sprocket needed for 1,000 RPM operation.
Result: Balanced 17T sprocket rated to 1,500 RPM with H6 bore. Smooth operation; no vibration at full PTO speed.
“The baler runs smoother than it did with the OEM sprocket.” — Contractor
Frequently Asked Questions
Do you supply sprockets for all Australian tractor brands?
Yes. Our sprockets fit John Deere, Case IH, New Holland, Kubota, Massey Ferguson, Fendt, Claas, and more.
Can I change my seed-drill rate by swapping sprockets?
Absolutely. We supply ratio-change sprocket kits for popular seed-drill models.
Do you sell directly to farmers?
Yes. Order online or via email. We also supply through agricultural dealers and co-ops.
What chain pitch is most common on tractor PTO drives?
ANSI 50 (5/8″ pitch) and ANSI 60 (3/4″ pitch) are the most common for PTO-driven implements.
Can you supply hardened sprockets for sandy-soil regions?
Yes. Our induction-hardened and Dacromet-coated sprockets are designed for Australia’s abrasive sandy soils.
Do you offer bulk pricing for farm-supply retailers?
Tiered wholesale pricing is available. Contact us for a dealer application.
What warranty applies to agricultural sprockets?
12-month warranty against manufacturing defects. Warranty does not cover normal wear from abrasive conditions.
Can I get sprockets with metric bores?
Yes. We supply both imperial (inch) and metric bores as standard.
Do you supply replacement track drive sprockets for crawler tractors?
Yes. Contact us with your tractor model and we’ll cross-reference the correct track sprocket.
How fast can you deliver to regional Australia?
Stock items ship within 2–3 days. We use StarTrack and regional freight for remote delivery.
Related — Transmission Chains
Pair with our agricultural roller chains — zinc-plated and pre-lubricated for extended field life.
Certifications
✅ ISO 9001:2015 | ✅ ANSI B29.1 / ISO 606 | ✅ DIN 8187/8188 | ✅ RoHS | ✅ EN 10204 3.1 | ✅ CE
Why Ever-Power Australia Sprockets Co., Ltd.?
We’ve been producing agricultural and industrial sprockets for over 20 years. Our factory serves farmers, dealers, and OEMs across Australia and 50+ countries. With Australian warehouse stock, fast regional delivery, and the ability to match any OEM part, we’re the reliable partner Australian agriculture needs.
Keep Your Tractor Running — Contact Us
Harvest waits for no one.
From PTO sprockets to track-drive replacements, Ever-Power Australia Sprockets Co., Ltd. delivers the quality and speed Australian farmers depend on. Get a quote today.
