Rocker Arm Assembly 3052170 3047479 for Cummins NT855 NH855 CM558 G855 N14 John Deere 6810 6910 Engine

Product Specifications

Compatible Models

Tired of Engine Misfires and Costly Downtime? Get the Correct Rocker Arm Assembly 3052170/3047479 for Your Cummins NT855 or John Deere 6910

Every hour your excavator or agricultural tractor sits idle due to valve train failure costs hundreds — sometimes thousands — of dollars in lost productivity. Many operators report repeated failures after installing low-grade rocker arms: bent pushrods, uneven valve lash, and premature camshaft wear. OEM replacements take weeks to arrive, while counterfeit parts lack proper heat treatment and fail within 200 operating hours.

OEM-Equivalent Quality, In Stock and Ready to Ship

This rocker arm assembly meets original Cummins NT855 and John Deere 6910 dimensional and performance specifications. Built by ISO 9001-certified factories with 10+ years of engine component experience, each unit undergoes pre-shipment functional testing under simulated load conditions. Used by fleet operators maintaining heavy-duty engines in continuous-duty applications like quarrying and grain harvesting, it delivers consistent valve actuation without adjustment drift during extended operation.

Where This Part Works

This rocker arm assembly is engineered for high-cycle, high-load environments: mining haul trucks running 24/7 on abrasive terrain, port-side loaders handling container stacks, and large-scale farm tractors engaged in deep-tillage operations. Under these conditions, the rocker arm endures repeated impact loads up to 1,200 bar hydraulic pressure equivalent and thermal cycling from -20°C to +180°C. Selecting a dimensionally accurate, properly hardened part prevents valve float, maintains compression integrity, and avoids catastrophic cylinder head damage — especially critical for Tier II/III emission-compliant engines like the Cummins N14.

Engineering Details That Matter

Forged 42CrMo alloy steel ensures uniform grain structure and fatigue resistance beyond cast equivalents. Surface hardness is precisely controlled at HRC 48–52 after quenching and tempering — critical for resisting roller follower wear and maintaining geometry over 12,000+ operating hours. Dimensional tolerance on pivot bore diameter is held to ±0.01 mm to prevent bushing galling and oil leakage into the valve cover. Each assembly includes OEM-spec phosphated finish for corrosion resistance and compatibility with standard engine oils meeting API CJ-4/CK-4 specifications. The 3052170 rocker arm geometry replicates exact lift ratio and contact angle of the original Cummins design — ensuring correct valve opening duration and preventing interference with piston crown clearance.

The Real Cost of Wrong Parts

A $45 counterfeit rocker arm may save upfront, but causes misfire codes, burned valves, and forced engine teardowns within 500 hours — adding $2,800+ in labor, $1,200 in replacement components, and 3+ days of downtime. Industry data shows non-OEM-equivalent valve train parts increase unscheduled maintenance frequency by 3.7×. This 3052170 3047479 rocker arm assembly complies with SAE J2412 and Cummins Engineering Standard CES 10024, reducing total cost of ownership (TCO) through longer service life, predictable maintenance intervals, and full interchangeability with existing service kits. It’s not just a part — it’s verified continuity for your engine’s breathing system.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually sealed in moisture-resistant box with VCI anti-corrosion paper and custom-molded EPE foam cradle
• In-stock items ship within 2–5 working days after order confirmation
• Flexible logistics: DHL/FedEx/UPS express (3–7 days), air freight (7–12 days), or sea freight (25–40 days)
• Real-time tracking number provided upon dispatch, with proactive delivery updates
• MOQ is 1 piece — designed for urgent field repairs and single-engine rebuilds

Get Your Rocker Arm Assembly Now

Your engine can’t wait — every delay adds cost. Send us the part number (3052170 or 3047479), your engine model (e.g., Cummins N14 or John Deere 6810), and required quantity. You’ll receive a competitive quote within 24 hours. First-time customers may request a sample for physical verification before bulk order. With Guangzhou inventory and fast dispatch, your replacement arrives before the next scheduled service window.

Frequently Asked Questions