10K–16K Oil Bath Hub Service Kit for AL-KO/Rockwell #120 Spindle, 4.88" Pilot
A service-focused oil bath hub kit built around the 120865-1PA AL-KO/Rockwell 10K HD hub drum, with matched inner and outer bearings, oil seal, and K71-859-00 oil cap kit for compatible #120 spindle applications.
Overview
This R&P-curated oil bath hub service kit is built for heavy-duty trailer wheel-end repair where the hub/drum assembly and the major service components should be replaced together. The kit centers on the 120865-1PA AL-KO/Rockwell 10K HD hub drum for #120 spindle applications and includes the matching inner bearing, outer bearing, oil seal, and K71-859-00 oil cap kit to support a cleaner, more complete oil bath hub service.
Visual reference for the 120865-1PA-KIT oil bath hub service package. Always verify hub number, spindle fit, bearing references, seal size, cap kit compatibility, and pilot measurement before installation.
R&P Service Insight
Oil bath hub service is not just about replacing the large hub/drum. The bearing set, rear oil seal, and cap assembly are the parts that help the wheel end rotate correctly, hold lubricant, and avoid carrying old leak points into a new repair.
- Cleaner BOM: The K71-859-00 oil cap kit replaces the older separate cap/O-ring/plug approach with a simpler service-kit component.
- Bearing Fit Matters: The JM205149 outer bearing and JM511946 inner bearing are key confirmation points before ordering.
- Oil Retention Matters: The 10-3125-06 oil seal and K71-859-00 oil cap kit help close up the oil bath system and protect the brake area from lubricant contamination.
R&P Knowledge Hub
Compatibility: Built around the 120865-1PA AL-KO/Rockwell 10K HD hub drum and the updated service BOM shown for this kit.
Vehicle / System Fit: Heavy-duty oil bath trailer hub service for compatible AL-KO/Rockwell-style #120 spindle applications where the hub, bearing numbers, oil seal, oil cap kit, and 4.88" pilot match.
Installation Notes: Verify the existing hub/drum number, pilot size, spindle application, inner bearing, outer bearing, seal size, and oil cap kit compatibility before installation.
Performance Insight: Oil bath hubs depend on both load support and lubricant control. Replacing the hub/drum with the correct bearings, oil seal, and cap kit helps address the wheel-end system as a complete service point.
Brand & Fitment Note
Selling Brand: R&P Carriages curated service kit.
Application Reference: AL-KO, Rockwell, and related platform names in this listing describe compatibility, fitment target, or application style only where supported by matching part numbers, dimensions, and configuration details.
What This Means: This listing is for a curated oil bath hub service kit assembled around the 120865-1PA hub drum and the related service components listed below. It is not being represented as a guaranteed OEM-branded kit unless specifically stated and verified.
Before Ordering: Verify hub/drum configuration, #120 spindle fit, 4.88" pilot requirement, bearing numbers, oil seal dimensions, cap kit compatibility, axle application, and included components before installation.
R&P Repair Insight
This kit is best understood as a wheel-end service package. It is especially useful when the existing oil bath hub is worn, damaged, leaking, contaminated, or being replaced after bearing, seal, or cap-related service issues.
- Check the Hub Body: Confirm the 120865-1PA AL-KO/Rockwell 10K HD hub drum is the correct replacement for the trailer’s existing hub and #120 spindle setup.
- Check the Bearing Set: Match both bearing references before installation. This kit includes JM511946 inner bearing and JM205149 outer bearing.
- Check the Oil Bath Service Parts: Confirm the 10-3125-06 oil seal and K71-859-00 oil cap kit match the application before assembly.
Features
Built Around the 120865-1PA Hub Drum
The 120865-1PA hub drum is the core component of this kit and is listed for AL-KO/Rockwell 10K HD #120 spindle applications where the hub configuration and 4.88" pilot match.
Includes Matched Bearing References
Includes JM205149 outer bearing and JM511946 inner bearing to support a more complete wheel-end service rather than reusing old bearing components.
Updated K71-859-00 Oil Cap Kit
The K71-859-00 oil cap kit simplifies the cap side of the service package by replacing the older separate cap/O-ring/plug handling with a cleaner kit component.
Oil Bath Seal Included
Includes the 10-3125-06 oil seal, listed as a 3.12" x 4.506" oil seal, to help retain hub oil and protect the brake area from lubricant contamination.
Specifications
| Specification | Detail |
|---|---|
| Part Number | 120865-1PA-KIT |
| Brand | R&P Carriages curated service kit |
| Product Type | Oil bath hub service kit |
| Core Hub / Drum | 120865-1PA · AL-KO/Rockwell 10K HD hub drum |
| Application Reference | Compatible AL-KO/Rockwell-style 10K HD oil bath hub applications where part numbers, spindle configuration, pilot size, and measurements match |
| Spindle Reference | #120 spindle application reference shown for the hub/drum component |
| Pilot Reference | 4.88" pilot |
| Outer Bearing | JM205149 · 1.969" ID · fits JM205110 reference |
| Inner Bearing | JM511946 · 2.559" ID · fits JM511910 reference |
| Oil Seal | 10-3125-06 · oil seal · 3.12" x 4.506" |
| Oil Cap Kit | K71-859-00 · oil cap kit · AL-KO 3.75" K568220 / 92185 application reference |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Heavy-duty trailer oil bath wheel-end system |
| Primary Fit | Compatible applications using the 120865-1PA hub drum with matching #120 spindle, 4.88" pilot, bearing, oil seal, and oil cap kit requirements |
| Application Style | AL-KO/Rockwell-style 10K HD oil bath hub service where configuration matches |
| Important Notes | Confirm the existing hub number, bearing numbers, seal size, pilot measurement, oil cap kit requirement, and spindle application before ordering. OEM names are used as application references only unless otherwise verified. |
Included Components
| Quantity | Part Number | Included Item | Purpose |
|---|---|---|---|
| 1 | 120865-1PA | AL-KO/Rockwell 10K HD hub drum, #120 spindle application, 4.88" pilot reference | Main hub/drum body for the wheel-end assembly and brake drum surface. |
| 1 | JM205149 | Outer bearing, 1.969" ID, fits JM205110 / AL-KO 10K HD application reference | Supports the outer side of the hub on the spindle and helps the hub rotate smoothly under load. |
| 1 | JM511946 | Inner bearing, 2.559" ID, fits JM511910 / AL-KO 10K HD application reference | Supports the inboard side of the hub and serves as a key fitment confirmation point. |
| 1 | 10-3125-06 | Oil seal, 3.12" x 4.506" | Rear oil seal helps retain hub oil and protect the brake area from lubricant contamination. |
| 1 | K71-859-00 | Oil cap kit, AL-KO 3.75" K568220 / 92185 application reference | Cap-side oil bath service kit component used to close and service the oil bath hub assembly. |
