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What This Carrier Bearing Hub Is

The ECCPP Rear Axle Carrier Bearing Hub covers the full 2006–2026 Yamaha Raptor 700 / YFM700 / YFM700R production run. It supersedes Yamaha OEM numbers 1PE-25311-00-00 and 1S3-25311-00-00 as a direct dimensional equivalent, with backwards and forwards compatibility across every model year, including 2026 YDT-ready units.

The housing is CNC-machined from forged 6061-T6 billet aluminum to SAE J403/J404 standards. Tensile strength is 310–350 MPa with a Brinell hardness near 95 HBW. Forged billet contains no internal porosity or micro-voids, and cast housings start to stress-fracture at exactly those weak points under aggressive trail loads.

The material choice tracks the 2026 market: Ford Bronco Raptor driveline parts, Polaris RZR Pro R bearing assemblies, and GM Performance UTV axle carriers have moved toward forged billet for load-bearing components. Polaris and Can-Am shifted the RZR Pro R and Maverick R carriers from cast A356 to forged 6061 for the 2026 model year.

Core Specifications (SKU 065106)

Those life numbers deserve a second look: 8,000–12,000+ miles projected for the ECCPP carrier, 4,000–7,000 for the OEM casting, and 1,500–3,000 field-reported miles for unbranded cast copies. Mud-heavy and dune use cuts any of them by 30–40%.

Engineering Details

Bearing layout

The dual-row tapered roller bearing spreads radial and axial loads across a contact patch 38% larger than the single-row ball bearing in the OEM housing. It targets the most common field-reported failure on this platform: inner race brinelling from sharp trail impacts at speeds above 45 mph.

Sealing and machining

A greaseable, fully-sealed labyrinth design with double-lip nitrile seals gives IP67-equivalent ingress protection. Water intrusion is the single largest contributor to premature bearing failure on bikes run through submerged creek crossings and humid coastal dunes. Bearing seats machined to ±0.0127 mm concentricity keep preload uniform across both roller rows.

Grease access

An integrated zerk sits at the 12 o'clock position, so you can regrease without pulling the swingarm. OEM and budget carriers are sealed and non-serviceable, so a dried-out unit means full replacement. Polaris and Can-Am have only begun adding serviceable zerks to their 2026 UTV carriers.

Failure Stages and Symptoms

• Stage 1: an intermittent low-frequency hum or growl from the rear swingarm area above 25 mph, most pronounced in left-hand cornering, which loads the right-side bearing.
• Stage 2: lateral play above 1.5 mm when you grab the rear wheel at the 12 and 6 o'clock positions and rock it. OEM maximum allowable runout is 0.5 mm.
• Stage 3: constant grinding with visible metallic flake in the carrier grease. Continued operation risks axle journal scoring, which turns a bearing swap into a full axle replacement.

OEM single-row bearings typically go from first noise to Stage 3 within 200–400 additional miles. The ECCPP dual-row design is engineered to arrest progression at Stage 1, while the fix is still a regrease or a planned swap.

DTC Codes and the 2026 YDT

The carrier is a passive mechanical assembly with no embedded sensor, so bearing degradation will never set a DTC or light the MIL on its own. The 2026 Yamaha Diagnostic Tool monitors the EFI system, ignition, and the sensor network: TPS, CPS, O2, IAT, and ECT. Physical inspection is the only direct check on this part.

Codes that can trace back to the carrier

Severe bearing failure still leaves traces in the log. Driveline vibration can trigger false-positive chassis codes in the C0500-C0599 range (chassis vibration sensor correlation). Heavy vibration can also log secondary misfire codes P0300-P0302 from induced sensor noise, plus manufacturer-specific YDT-07xx chassis codes.

Intermittent chassis vibration codes with no engine anomaly behind them means you inspect the carrier bearing first, before replacing ignition or fuel parts.

When the fault is a sensor or fuel part

The YDT reads the EFI side directly, so run those checks when codes point that way. For TPS faults on early bikes, Koeep stocks the throttle position sensor 1S3-W8588-00-00 for 2006-2007 YFM700R. For fuel delivery on 2006–2016 bikes, there is the 5VK-137610000 fuel injector for Raptor 700, 700R, and YFM700RSE.

The same code-to-part mapping runs across brands. The Fuel Temp Switch RE503242 DTC mapping and John Deere 7000-Series compatibility guide covers the diesel-equipment side.

Swingarms and Aftermarket Axles

Housing outer diameter and bearing journal dimensions are machined to OEM spec, so the carrier drops into any swingarm built for the stock Yamaha form factor (the 1PE-25311-00-00 pattern). That covers aftermarket swingarms from Lonestar Racing, Fireball Racing, and JTM Products.

For oversized axles from Durablue, RPM, or Tusk that exceed OEM diameter by more than 2 mm, check the axle bearing surface diameter against OEM spec before ordering. The dual-row configuration adds tolerance headroom for minor diameter variation that would cause binding in a single-row OEM housing.

Paddle tires and wheel swaps push peak loads into this housing. If you are changing rubber or wheels around a carrier rebuild, the Wheels, Tires & Parts collection holds the matching hardware.

Service Schedule

• Grease: every 25 operating hours, and after any submerged water crossing, via the zerk with NLGI #2 lithium-complex grease.
• Inspection: every 100 hours or annually, whichever comes first.
• Replacement: at 8,000–12,000 miles of mixed terrain, or immediately at the first Stage 1 symptom.
• Harsh use: mud-heavy and sand-dune environments cut service life by roughly 30–40% through abrasive ingress.

These intervals follow the 2026 SAE J1939-aligned maintenance scheduling framework adopted by Yamaha's powersports division.

EV Bearings and Passive Design

Tesla and Ford EV platforms use integrated wheel-end motor bearings with Hall-effect speed sensors and CAN-bus 3.0 telemetry, so the vehicle reports a failing bearing electronically. The Raptor 700 carrier has no electronics, which makes material quality and seal design the entire early-warning system.

The 6061-T6 forged approach mirrors what Tesla did with the Cybertruck's cast-aluminum rear subframe nodes in 2026, and GM's 2026 Silverado EV drive-unit housings use an analogous Al-Si-Mg alloy system. With no sensor on the ATV, IP67-equivalent sealing plus forged billet construction is the strongest passive protection in the 2026 ATV aftermarket.

Verification and OEM Equivalency

ECCPP verified the carrier as a direct dimensional equivalent to 1PE-25311-00-00 and 1S3-25311-00-00 through CMM (Coordinate Measuring Machine) analysis against OEM reference samples. Bearing seats, seal grooves, and mounting flange bolt patterns meet or exceed OEM GD&T per ASME Y14.5-2018.

Premium-tier makers (ECCPP, Lone Star Racing, MODQUAD) have standardized on CNC-machined 6061-T6 billet, while budget suppliers still push low-density cast housings that spall under sustained lateral G-loading. Koeep runs live inventory tracking and same-day dispatch on verified orders, for recreational riders and commercial ATV fleet operators.

Frequently Asked Questions