Hitachi ZX240-3-Compatible Camshaft Bearing Set – Model-Matched

Cross-reference verified — eighteen superseded and alternate numbers mapped against ZAXIS engine sub-models to prevent misfit on 4HK1 and 6HK1 platforms.

Technical Specifications

Application Suitability

Why the Same Camshaft Bearing Set Ships in Multiple Variants Across ZAXIS Models

One base part number can map to several bearing grades depending on engine sub-code and production year.

From a catalog desk in Guangzhou, I have watched parts counters ship the wrong camshaft bearing set because the cross-reference table did not distinguish between a 6HK1XZSA01A and a 6HK1XQA03D. Both engines sit inside Hitachi ZAXIS machines that look identical on the outside, yet the bearing wall thickness and journal diameter tolerance differ enough to cause early wear or a no-fit on the bench. Superseded numbers add a second layer of confusion: 8973861891 (cross-reference only) replaced the earlier 8973861890, and many online listings still show both as interchangeable without flagging the production split [NEED_CITE: Isuzu 6HK1 camshaft bearing grade selection by engine serial prefix].

Fitment Range Spanning Three ZAXIS Generations

This aftermarket Camshaft Bearing Set for Hitachi ZX240-3 ZX270-3 ZX330-3 ZX350 cross reference covers machines from the ZX170W-3 through to the ZX500W, including ZAXIS-5N and ZAXIS-6N variants. The list extends beyond a single engine family: mid-tonnage excavators with the 4HK1 block and heavy units with the 6HK1 block both appear on the compatibility sheet, but only when the correct sub-model is matched. That is why we ask for the engine plate or machine serial before confirming the set.

Variant Differences That Decide Whether the Bearing Presses In or Falls Through

The 6HK1 engine family alone includes XASA, XKSA, XZSA, and XQA variants, each carrying distinct bearing grade requirements shaped by emission tier and power output. A Tier 3 build may demand a different wall thickness than a Tier 2 predecessor sharing the same displacement. When an older ZAXIS-3 machine comes in for overhaul, the stamped number on the worn bearing may already be superseded, and the replacement set must match current production dimensions rather than the original print [NEED_CITE: Isuzu engine bearing grade differentiation across emission tiers].

Dimensional Verification Before the Set Leaves the Shelf

Inner diameter, width, and wall thickness at each bearing position must align with the journal measurements taken during teardown. We provide dimensional data sheets on request so rebuild shops can cross-check before committing to a bulk order. When only a machine model is readable and the original number is painted over, a nameplate photograph plus the engine serial prefix is usually enough to narrow down the correct set from the eighteen reference numbers on file.

The Hidden Cost of a Bearing That Almost Fits

A camshaft bearing that presses in with light force or shows a slight clearance mismatch at assembly may run for several hundred hours before oil pressure begins to bleed past the journal. By that point the head has been reassembled, the machine has returned to site, and the cost of a second teardown dwarfs the price of a sample verification set. I have seen ZX330-3 machines come back with scored journals because the bearing grade was one step off [NEED_CITE: camshaft bearing clearance tolerance and journal scoring risk].

Why Verification Happens Here Before It Happens on Your Bench

Eighteen cross-reference numbers are mapped and tracked for supersession rather than copied blindly from a shared table. Sample sets ship ahead of bulk commitments so fitment can be confirmed on one engine before the fleet order is released. The technical team works from the same Isuzu engine data used by rebuild shops, checking sub-model codes and serial ranges rather than relying on a single OEM reference number. Self-produced lines and qualified sourced supply carry identical warranty terms under one account. Guangzhou warehouse stock on common variants means fast dispatch when the machine is already down and the engine bay is open.

Documentation & Verification

• Commercial invoice listing each bearing position and matched reference number
• Cross-reference sheet showing all eighteen numbers marked as interchange reference only
• Dimensional check record covering inner diameter and wall thickness per position
• Warranty terms covering manufacturing defects for 3-12 months
• Packing photographs showing bearing set sealing before dispatch
• HS code and customs documentation support for engine parts export

Fitment Check Before Installation

• Compare each bearing shell against the old set for width and oil hole alignment
• Measure journal diameter with a micrometer and match to bearing grade chart
• Verify oil groove position matches the block casting before pressing in
• Confirm camshaft end-play falls within specified range after assembly
• Reject any shell showing uneven crush height or coating irregularity
• Request replacement set if spline engagement depth differs from the removed bearing

Confirm the Right Set Before You Order

Send the machine model plate, engine serial number, or a photograph of the worn bearing with any visible stamping. We will cross-check against the full reference list and return the matched set with dimensional data so you can verify on the bench before the engine goes back together.

Frequently Asked Questions

Q: How do I confirm which of the eighteen reference numbers applies to my specific ZAXIS machine? A: Provide the engine sub-model code from the nameplate, such as 6HK1XZSA01A or 4HK1XKSA02D. We cross-check that code against our supersession map and return the single applicable number along with dimensional data. If the plate is unreadable, a photo of the old bearing plus the machine serial prefix is usually sufficient.

Q: My old bearing shows a number that is listed as superseded — can I still use the replacement set? A: In most cases yes. Superseded numbers like 8973861891 (cross-reference only) replaced earlier references with dimensionally compatible or improved versions. We confirm that the replacement set matches current production specs for your engine serial range before shipping, so the new set fits without modification.

Q: The same ZAXIS model has different engine sub-codes — do they all take the same camshaft bearings? A: Not always. A ZX350-3 might carry a 6HK1XASA11A or a 6HK1XQA03D depending on build year and emission tier. These sub-codes can require different bearing grades with distinct wall thicknesses. We verify the exact sub-code before confirming the set to avoid a mismatch at the rebuild bench.

Q: I only have the machine model, no readable part number — can you identify the correct set? A: Yes. Send a photograph of the machine nameplate showing model and serial number. We cross-reference that data against the Isuzu engine build records to identify which camshaft bearing set matches your specific production batch, even when the original stamping has been worn away or painted over.

Q: Can I get a sample set to verify fitment before ordering for my whole fleet? A: Sample sets are available for single-engine trial fitment before you commit to a fleet quantity. This lets your rebuild shop confirm bearing grade, crush height, and oil hole alignment on one unit. Once verified, the bulk order ships from stock with identical specifications and warranty terms.