Verified Fitment Camshaft Bearing Compatible with Hitachi ZX240-3 4HK1

Verified Cross-Reference — Consolidated part numbers spanning superseded Isuzu 4HK1 and 6HK1 camshaft bearing variants, confirmed against Hitachi ZX-3 series engine builds before dispatch.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Multiple Variants

Camshaft bearing selection for Isuzu 4HK1 and 6HK1 engines depends on engine code suffix, not just the base machine model.

A ZX240-3 can leave the factory with either a 4HK1XASA12A or a 4HK1XZSA03, and the camshaft bearing oil hole positions differ between these builds. Ordering by excavator model alone leads to misalignment during assembly. I have seen bearings returned because the cross-reference table the buyer used did not distinguish between 6HK1XASA12A and 6HK1XZSA01A — two engines that share a machine platform but use different bearing journal configurations. This Camshaft Bearing for Hitachi ZX240-3 / Isuzu 4HK1 6HK1 cross reference fitment covers the consolidated range, but the exact suffix must be confirmed before shipping [NEED_CITE: engine variant identification methods for Isuzu HK series in construction equipment].

Coverage Across Hitachi ZX-3 and Isuzu HK Engine Families

This camshaft bearing set addresses the fitment spread from compact 4HK1-powered units like the ZX170W-3 through to heavy 6HK1 applications in the ZX350LC-3 and SCX700 crawler cranes. The listing consolidates multiple superseded part numbers — including the 8973861890, 8973569390, and 8976026990 series — that were issued across different production years of the same engine family. When a part number has been superseded, the replacement may carry different oil port clocking or wall thickness tolerances. Each order is verified against the specific engine serial range to ensure the correct variant ships.

Oil Hole Position and Journal Diameter Verification

The critical interface on any camshaft bearing is the oil feed hole alignment relative to the block gallery. For 4HK1 variants such as the 4HK1XKSA02D, the feed hole clocking angle differs from the 4HK1-XYSA series. Installing a bearing with misaligned oil feed results in inadequate camshaft journal lubrication and accelerated wear [NEED_CITE: camshaft bearing lubrication requirements for medium-duty diesel engines]. The phosphated surface treatment provides corrosion resistance during storage and initial run-in, while the precision-ground high-carbon steel bearing surfaces maintain radial clearance within tolerance. The dimensional inspection record supplied with each set documents inside diameter, wall thickness, and oil hole position against the engine specification sheet.

Dimensional Inspection Before Fitment

Before pressing these bearings into the block, compare the oil hole position on each bearing shell against the old set or the engine workshop manual diagram. The 6HK1 TIER3 and UM6HK1 variants may specify a different number of bearing positions compared to earlier production engines. Measure the inside diameter of each installed bearing to confirm radial clearance falls within specification. If any bearing shows tight fit on the camshaft journal, do not force assembly — request a replacement from the batch.

The Cost of Unverified Cross-Reference Tables

When a cross-reference table copies a superseded number without noting the variant change, the bearing may physically fit the block bore but fail to align with the oil gallery. The machine runs initially, then the camshaft journal scores within the first hundred hours. The excavator goes back down, the head has to come off again, and the cost of the second teardown far exceeds the bearing set itself. This pattern repeats across 4HK1 and 6HK1 rebuilds where the engine code suffix was never confirmed [NEED_CITE: common causes of camshaft bearing failure after engine overhaul].

Why Buyers Confirm Fitment Here

Every Camshaft Bearing order is matched to the buyer's specific engine code suffix, not just the excavator model. Cross-reference verification covers all superseded and alternate numbers in the 8973861890 through 8943903111 range, so even a worn or partially readable number can be resolved. Sample sets are available for physical fitment confirmation before bulk commitment. The technical team verifies oil hole position and journal diameter against the engine build record. One account covers this bearing alongside any additional block and internal parts required for the same job, under unified warranty terms.

Documentation & Verification

• Commercial invoice listing each bearing position and corresponding engine code suffix
• Cross-reference sheet mapping all superseded numbers with reference only notation
• Dimensional inspection record covering bore diameter, wall thickness, and oil hole clocking
• Quality inspection photographs showing phosphated surface condition before packing
• Warranty terms specifying coverage period for manufacturing defects
• HS code and customs documentation support for cross-border shipment

Fitment Check Before Installation

• Compare oil hole position on each new bearing against removed shells or block gallery port
• Measure installed inside diameter to verify radial clearance before camshaft insertion
• Confirm bearing count matches engine specification — some 6HK1 variants use additional positions
• Check phosphated coating is intact with no scoring or transit damage on bearing surfaces
• If any shell shows tight fit on journal, halt assembly and request dimensional re-check

Inquiry Guidance

Provide the machine model, engine plate photograph, or the specific engine code suffix (e.g., 6HK1XASA12A) so the correct camshaft bearing variant can be identified. If the old part number is worn or superseded, send a clear image and the cross-reference will be resolved. For fleet orders covering multiple Hitachi or Isuzu-powered units, share the engine list to receive a consolidated fitment sheet.

Frequently Asked Questions

Q: How do I confirm this camshaft bearing set fits my specific Hitachi excavator or Isuzu engine variant? A: The most reliable method is to provide the full engine code from the engine nameplate — for example, 6HK1XASA12A rather than just 6HK1. This suffix determines the oil hole position and journal configuration. If the plate is unreadable, send the machine serial number and we cross-reference the original engine build record to confirm the correct bearing set.

Q: My old part number does not match any current listing — is it superseded? A: Part numbers across the Isuzu 4HK1 and 6HK1 range have been superseded multiple times. Numbers like 8973569390 and 8943903110 were replaced by later revisions that may carry dimensional changes. Share the worn or stamped number and we verify whether it maps to a current available variant, noting any oil hole or thickness differences that affect fitment.

Q: Why are there so many different reference numbers for the same camshaft bearing? A: Isuzu issued different numbers for the same base bearing across engine generations, tier changes, and application variants. A ZX330-3 with a 6HK1 TIER3 engine may reference a different number than a ZX330-3 with a standard 6HK1XZSA-01. The consolidated cross-reference in this listing maps these variants so the correct set is identified regardless of which original number is stamped on the old part.

Q: I only have the machine model with no readable part number — can you identify the correct set? A: Yes. Provide the excavator or loader model (e.g., ZX240-3 or ZW250) along with any visible engine identification. We cross-reference the machine serial range against known engine configurations to narrow the correct bearing variant. For absolute certainty, we recommend ordering a sample set for physical fitment check before committing to a bulk order.

Q: Can I get a sample to verify fitment before committing to a bulk order? A: Sample sets are available for fitment confirmation. Install the sample on the target engine block, verify oil hole alignment and journal clearance, then confirm the bulk order once fitment is validated. This approach is particularly useful when standardizing across a mixed fleet of Hitachi excavators with different 4HK1 and 6HK1 engine variants.