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Eaton K-4603 Input Shaft Kit | Endurant HD OEM
Eaton K-4603 Input Shaft Kit for Endurant HD transmissions. Complete OEM replacement including input shaft assembly, bearings, O-rings, snap rings & synchronizer components. Direct fit for EEO-17F112C & EEO-18F112C. Global shipping & lifetime warranty. Get your quote today!
Product Details
Eaton K-4603 Input Shaft Kit – Endurant HD OEM
Factory-direct OEM replacement kit for Eaton Cummins Endurant HD automated transmissions. The K-4603 is a complete Input Shaft Service Kit, providing all necessary components for input shaft replacement or repair. Essential for restoring smooth clutch engagement, precise synchronization, and reliable power transfer in high-mileage heavy-duty applications.
Why Choose the Eaton K-4603 Input Shaft Kit?
- Complete OEM service kit – input shaft assembly + bearings, O-rings, snap rings & synchronizer parts
- Precision-machined for perfect alignment and reduced wear
- Restores full transmission performance and shifting smoothness
- Direct fit for Endurant HD models (verify OEM/engine compatibility)
- Recommended during clutch or input bearing service
- 28 years of OEM-level manufacturing experience at Volgen Power
Technical Specifications – Typical Kit Contents (Based on Endurant HD Input Shaft Kits)
| Item # | Description | Part Number (Reference) | Qty |
|---|---|---|---|
| 1 | Input Shaft Assembly (NSS) | S-3205 (or similar) | 1 |
| 2 | Main Drive Gear Assembly, Welded | EAHDA-10000902 / A-10000902 | 1 |
| 3 | Splitter Synchronizer Ring | EAHD10002550 / 10002550 | 1 |
| 4 | Sliding Sleeve | EAHD10001942 / 10001942 | 1 |
| 5 | Input Shaft Bearing O-Ring | EAHD10003862 / 10003862 | 1 |
| 6 | Input Shaft Ball Bearing | EAHD10004584 / 10004584 (Hard Lock Design) | 1 |
| 7 | External Snap Ring | EAHD10000624 / 10000624 | 1 |
| 8 | Rail B Synchronizer Small Parts Kit | EAHDK-4388 / K-4388 | 1 |
Important Note: Exact contents may vary by OEM/engine configuration. Hard Lock Bearing Design (10004584) requires a compatible Input Shaft Cover Kit K-4657. Main Shaft End-Play adjustment required after installation (selective washers: 10000555, 10001759, 10001760). The pilot bearing often separates (customer pays).
Vehicle & Transmission Compatibility
Designed exclusively for Eaton Endurant HD Series:
| Transmission Models | Application Notes |
|---|---|
| EEO-17F112C / EEO-17F112C-XD | 17-speed Endurant HD |
| EEO-18F112C | 18-speed Endurant HD |
Popular Applications: Freightliner Cascadia, Peterbilt 579/567, Kenworth T680, International LT – paired with Cummins X15, Detroit DD15, PACCAR MX engines (verify input shaft stamping or measurement for exact match: e.g., ISO vs SAE, wear sleeve X/Y dimension).
Important Compatibility Note: Use OEM/engine-specific kit (e.g., EAHDK-4659 for many ISO configs). Superseded/related to K-4360 in some older references. For Hard Lock upgrades, pair with K-4657 Input Shaft Cover Kit.
Installation Highlights
Requires clutch housing access (transmission removal recommended in most cases). Press in new bearing (orientation critical for Hard Lock), install O-ring/snap ring, and perform full clutch/main shaft recalibration using ServiceRanger. Torque to spec. Total service time: 6–10 hours. Reference Eaton Endurant HD Service Manual TRSM0950.
Why Buy from Volgen Power?
- 100% genuine OEM specification – direct from the Eaton Cummins supply chain
- Factory direct pricing – up to 40% lower than dealerships
- Lifetime warranty on all transmission components
- Fast global shipping from China + USA warehouse stock
- Trusted by fleets in 70+ countries since 1996
- Full technical support & input shaft verification guidance
Frequently Asked Questions
What is included in the Eaton K-4603 kit?
Typical contents: Input shaft assembly, main drive gear, synchronizer ring/sleeve, bearing (Hard Lock where applicable), O-ring, snap ring, and Rail B small parts kit (K-4388). Exact match your OEM/engine.
How do I know if K-4603 fits my transmission?
Check input shaft end stamping or measure diameter (X: 20.50-20.80 mm or Y range). Compare to OEM/engine (e.g., Cummins X15 often uses specific variants like EAHDK-4659). Contact us with your transmission SN for confirmation.
Is this compatible with Hard Lock Bearing Design?
Yes – many configs use Hard Lock input shaft bearing (10004584). Requires a compatible Input Shaft Cover Kit K-4657.
Do I need to adjust the main shaft end-play?
Yes – mandatory after input shaft replacement. Select from washers 10000555, 10001759, or 10001760.
What is your warranty on this kit?
Lifetime warranty against manufacturing defects when installed correctly and calibrated per factory procedure.
Ready to replace your Endurant HD input shaft?
GET INSTANT QUOTE →
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