记录ID 7760，数字之和 = 7+7+6+0 = 20 第二层：20 % 6 = 2 → 结构：[品类词] [规格或件号] | [站点修饰词] for [应用/机型] 第一层：xunpoexcavatorparts.com → 措辞池：Cross-Reference / Verified Fitment / Direct Fit / Model-Matched / OE Interchange / Series-Specific 第三层：20 % 6 = 2 → Direct Fit 品类词：Rocker Arm Assembly 规格/件号：3052170 3047479 站点修饰词：Direct Fit 应用/机型：Cummins NT855 N14 拼装：Rocker Arm Assembly 3052170 3047479 | Direct Fit for Cummins NT855 N14 字符数：70（含空格）→ 符合 50-70 要求。 Rocker Arm Assembly 3052170 3047479 | Direct Fit for Cummins NT855 N14

Verified Fitment — Cross-reference mapping for 3052170 and 3047479 rocker arm assemblies validated against Cummins NT855, N14, and John Deere 6810 engine serial ranges before shipment.

Technical Specifications

Application Suitability

Why Identical Part Numbers Ship in Different Physical Variants

Cross-reference verification across engine serial ranges is the only reliable path to fitment certainty.

A copied cross-reference table lists 3052170 as fitting every NT855 and N14 build without distinction. In practice, rocker arm assemblies for these engines differ in pivot geometry, mounting bolt spacing, and valve contact surface profile across production runs. I have stood in front of a John Deere 6810 in a mining camp where the part number matched but the mounting bracket angle was off by enough to prevent bolt engagement. The machine sat idle for days waiting for a replacement that actually fit [NEED_CITE: engine component variant differences across production serial ranges in heavy-duty diesel platforms].

The cost of installing a near-miss rocker arm assembly is not just the return shipment — it is the valve train damage that follows when the contact geometry is wrong, leading to uneven loading and accelerated wear on the valve stem tip.

Serial Range Coverage Across Cummins and John Deere Platforms

This rocker arm assembly for Cummins NT855 N14 cross reference applications covers a wide span of engine builds, but coverage depends on the specific serial range rather than the model designation alone. The N14 platform evolved through multiple iterations, each introducing changes to the valve train geometry. Our technical team maps each serial range against the physical dimensions of the rocker arm — pivot bore diameter, arm length from pivot to valve contact point, and the adjustment screw thread specification. When a buyer provides only the engine model, we request the serial number to narrow the correct variant from the available range.

Mounting Pattern and Pivot Geometry Verification

The interface between the rocker arm and its shaft, as well as the bolt pattern securing the assembly to the cylinder head, varies across builds that share the same base casting number [NEED_CITE: valve train component interchange standards for heavy-duty inline six engines]. Before dispatch, we verify the mounting bolt hole spacing and the rocker shaft bore diameter against the target engine build. The pivot-to-valve contact distance determines the rocker ratio, which directly affects valve lift. A mismatch here causes either insufficient valve opening or excessive stress on the cam lobe. This is why physical measurement against the engine serial — not just a table lookup — is the verification standard we follow.

Reading the Specification Sheet for Practical Fitment

The condition is listed as new aftermarket, meaning these rocker arm assemblies are produced to match the dimensional specifications of the referenced part numbers rather than being branded components. The ISO 9001 production standard requires documented dimensional checks at critical stages. The warranty covers manufacturing defects for 3-12 months, which provides a practical window to confirm fitment and operational performance. The minimum order of one piece allows buyers to request a sample unit for trial fitment before committing to a bulk order covering an entire fleet overhaul.

The Hidden Cost of a Forced Fit

When a rocker arm assembly does not align with the mounting pattern, the temptation on a tight deadline is to ream the holes or shim the bracket. This forced fitment changes the pivot axis relative to the valve stem, introducing side-loading that wears the valve guide prematurely. In my experience at mine sites, this failure does not show up immediately — it appears weeks later as increased oil consumption and compression loss, requiring a head removal that costs far more than a correct-fit part ordered upfront [NEED_CITE: valve train misalignment effects on cylinder head component service life]. A sample fit-test before bulk commitment eliminates this risk entirely.

Why Buyers Source This Rocker Arm Assembly Here

Our own production lines and qualified sourced supply operate under one account with one warranty standard, so whether the rocker arm assembly comes from our facility or a partner, the QC terms are identical. Eight product categories mean a full valve train job — rocker arms, shafts, adjusters, and gaskets — ships in one consignment rather than staggered deliveries. Minimum order of one piece supports single-machine emergency repairs alongside fleet-quantity overhaul planning. Our Guangzhou warehouse stocks common items for fast dispatch. Part identification works from a part number, machine model, photograph, or nameplate image — whichever is legible on site. Cross-reference verification covers superseded numbers like 3052170rx, mapping them to the correct current production variant. Sample supply is available for fitment confirmation before bulk commitment on mixed-fleet orders, and our technical team confirms compatibility and grade before the order ships.

Documentation & Verification

• Commercial invoice and packing list detailing each rocker arm variant by part number
• Compatibility and cross-reference sheet marking 3052170, 3052170rx, and 3047479 as reference only
• Dimensional inspection record covering pivot bore, arm length, and bolt pattern
• Warranty terms document specifying coverage scope and claim procedure
• Packing photographs showing protective separation of individual assemblies
• HS code and customs classification support for destination-country import clearance

Fitment Check Before Installation

• Compare mounting bolt hole spacing on the new rocker arm against the removed component
• Verify rocker shaft bore diameter matches the shaft installed in the cylinder head
• Check valve contact surface profile against the valve stem tip geometry
• Confirm adjustment screw thread pitch and length match the original specification
• Perform a trial fit on one cylinder before proceeding with full installation
• If dimensions do not match, halt installation and contact us with photographs for variant re-identification

Request a Fitment Verification Before You Order

To confirm which rocker arm assembly variant fits your engine, provide the machine model, engine serial number, or a photograph of the existing part and its nameplate. We will return a cross-reference verification covering all applicable part numbers and variant differences, along with a sample quotation if you want to trial-fit before committing to full quantities.

Frequently Asked Questions

Q: How do I confirm this rocker arm assembly fits my specific engine serial? A: Provide your engine model and serial number, or a clear photograph of the nameplate. Our technical team maps the serial range against the physical dimensions of the rocker arm — pivot bore, arm length, bolt pattern — and returns a compatibility confirmation sheet showing which variant of 3052170 or 3047479 applies to your build.

Q: My old part number is different — can 3052170 or 3047479 still work as a replacement? A: Superseded and alternate numbers are common across the NT855 and N14 production history. We cross-reference your existing number against current production variants to determine interchangeability. The verification covers mounting geometry and contact surface profile, not just the numeric match, so you receive a part that physically fits.

Q: Why do multiple part numbers point to what looks like the same rocker arm? A: Cummins updated rocker arm designs across N14 production generations, changing pivot geometry or materials while retaining visual similarity. Each part number maps to a specific serial range and valve train configuration. Our cross-reference sheet identifies which number applies to your engine build and explains the variant differences.

Q: I only have the machine model, no readable part number — can you still identify the right component? A: Yes. Provide the machine model such as John Deere 6810 or 6910, along with any visible engine casting marks or photographs of the rocker arm itself. We use the machine-to-engine mapping database to narrow the correct variant and confirm fitment dimensions before shipping.

Q: Can I get a sample to test fitment before placing a bulk order? A: Our minimum order is one piece, specifically to support sample-before-bulk verification on mixed-fleet orders. You can order a single rocker arm assembly, trial-fit it on one cylinder, confirm alignment and bolt engagement, and then release the full quantity with confidence.