Connecting Rod Bearing 15531-22310 – Fits Kubota D722 D850

Fitment confirmed across Kubota compact-diesel variants — Cross-referenced against three superseded OEM numbers to guarantee journal match on D722 through V1200 engines and the KH-series excavators that share them.

Technical Specifications

Application Suitability

Why the Same Kubota Part Number Ships in Multiple Variants

Cross-reference verification is mandatory before installation to prevent journal scoring.

Kubota has issued 15531-22310, 15261-22310, and 15694-22310 across different engine generations. Independent aftermarket tables often copy errors forward, leading to misidentified shells that damage the crankshaft upon startup. [NEED_CITE: engine bearing identification and cross-reference accuracy in heavy equipment]. In my time stationed in Indonesia, I have seen rebuilds fail because a supplier assumed all D722 bearings were identical, ignoring the variant code on the engine plate.

Machine Serial Coverage and Variant Differences

The application range for this Con Rod Bearing spans from the D722 to the V1200, including specialized builds like the E75-NB3-HG-2. Identifying the correct shell requires looking past the machine model to the specific engine suffix. For instance, B7100HST-D tractors exist in both "NEW TYPE" and "OLD TYPE" configurations, which can dictate different internal clearances.

Interface Verification and Journal Condition

These shells assume an unreground, STD journal. If the crankshaft has been machined during a previous failure, installing STD bearings will result in immediate low-oil-pressure failure and catastrophic journal damage. Buyers must measure the journal or review the engine rebuild history before ordering. [NEED_CITE: crankshaft journal measurement procedures for compact diesel engines].

The Risk of Unverified Cross-Reference Data

Selecting a bearing based solely on a machine model plate is a primary cause of early engine failure. Copied tables frequently miss the hyphenated variations (e.g., 15531-2231-0) that Kubota uses to distinguish production runs. A mismatch of mere microns in shell thickness creates excessive clearance, leading to the characteristic "rod knock" that destroys the block.

The Hidden Cost of Trial Fitment on Site

Forcing an incorrect bearing shell into the connecting rod cap distorts the housing and compromises the crush fit. This leads to the bearing spinning in the rod, which destroys both the connecting rod and the crankshaft. The cost of a replacement crankshaft and the downtime for a full teardown far outweighs the time spent verifying the part number before shipment. [NEED_CITE: consequences of incorrect bearing crush fit in diesel engines].

Why Sourcing Here Eliminates Fitment Risk

• Verified Compatibility: We cross-check every order against machine serial and variant codes, not just the base model.
• Sample Verification: We support single-pair sample orders for trial fitment before you commit to a full overhaul set.
• Production Quality: Selected lines are manufactured in our own facility with ISO 9001 oversight, ensuring shell thickness consistency.
• Identification Support: Send a photo of the worn part or the nameplate; our technical team confirms the correct grade.

Documentation & Verification

• Commercial invoice and packing list with specific engine model references.
• Part compatibility and cross-reference sheet for 15531-22310 and superseded numbers.
• Dimensional inspection records confirming STD shell thickness and crush height.
• Quality inspection photographs of bearing surfaces and packaging integrity.
• Warranty terms covering manufacturing defects for 3 to 12 months.

Fitment Check Before Installation

• Clean the connecting rod housing and cap to ensure no carbon buildup affects shell seating.
• Verify the locating tang on the new bearing aligns with the notch in the connecting rod.
• Measure the crankshaft journal to confirm it remains within STD tolerance specifications.
• Perform a Plastigage test after torquing the rod bolts to verify oil clearance is correct.

Request a Fitment Verification

Provide the Kubota machine model, engine serial number, or a clear photo of the existing bearing and nameplate. We will cross-reference the superseded numbers and confirm the correct grade for your specific rebuild requirements.

Frequently Asked Questions

Q: How do I confirm 15531-22310, 15261-22310 and 15694-22310 are interchangeable for my engine serial? A: These numbers represent superseded production runs. While they often cover the same base engine, variant codes can change. Provide your engine serial number, and we will cross-reference our database to confirm which specific shell thickness and locating tang configuration your block requires.

Q: Why are there "NEW TYPE" and "OLD TYPE" variants for the same Kubota tractor model? A: Kubota frequently updates internal engine components during a model run. The "TYPE" designation often indicates a change in the crankshaft journal diameter or the connecting rod housing. We must verify the specific production date or engine serial to ensure the STD grade matches your machine.

Q: I only have the excavator model (e.g. KH-41) but not the engine plate — can you still identify the correct bearing? A: We can narrow it down, but compact excavators often use different engine variants within the same chassis. A photo of the machine's main nameplate or the fuel injection pump code helps us trace the original engine build and confirm the correct cross-reference.

Q: Can I order one sample pair to verify fitment before committing to a full overhaul set? A: Yes. We support single-piece sample orders. We recommend fitting one pair and checking the clearance with Plastigage before assembling the entire engine, ensuring the variant match is correct and the journal is within the STD tolerance range.