Oil Pump 16851-35012 Compatible with Kubota D722 D902 – Verified Fitment

Variant-by-variant fitment check — port orientation, spline tooth count and bolt pattern verified against your engine serial before this oil pump 16851-35012 leaves our Guangzhou facility.

Technical Specifications

Application Suitability

Why the Same Reference Number Ships in Multiple Variants

Cross-reference verification catches what generic lookup tables miss.

Kubota has issued a succession of part numbers — 15841-35010, 16851-35010, 16851-35012, and 16851-35014 — for oil pumps that look identical from the outside but differ in internal passage alignment and drive spline engagement. Aftermarket cross-reference tables copied between sellers frequently collapse these into a single interchangeable line, so a buyer ordering from a photo or a worn nameplate receives a pump that bolts on but fails to build oil pressure. In my years identifying parts in Guangzhou, I once saw a customer order what appeared to be the correct pump for a Kubota D722 based on a popular forum cross-reference, only to find the spline tooth count was two teeth short. The machine sat idle while a replacement shipped. [NEED_CITE: risks of collapsed cross-reference tables in aftermarket engine parts]

Mapping Superseded Numbers to Your Engine Serial Range

An oil pump 16851-35012 compatible with Kubota D722 and D902 engines may be listed under older references in legacy service manuals. The earliest number, 15841-35010, appears in manuals for B-series tractors built before the D902 platform revision. When Kubota updated the cylinder block casting, the oil gallery entry point shifted slightly, prompting the move to 16851-35010 and later 16851-35012. Each step preserved external bolt geometry but changed internal port alignment. Our cross-reference sheet maps each superseded number to the engine serial ranges where it applies, so you can match your specific build rather than guessing from a generic listing.

Port Position and Spline Tooth Count: The Two Checks That Prevent Field Failures

The base oil pump casting can be machined with the discharge port clocked at different angular positions depending on which engine variant it serves. On a D722 installed in a KX018-4 compact excavator, the port typically faces a specific gallery orientation that differs from a D902 in a ZD321 zero-turn mower. Similarly, the drive gear spline — while appearing visually similar — can vary in tooth count between early and late engine generations. Before dispatch, we verify port clock position and spline engagement against your machine model and, when available, the engine serial number. A sample unit can ship first for physical trial fitment when you are standardising supply across a mixed-model fleet. [NEED_CITE: oil pump port clocking variation across Kubota engine families]

What the Housing Material and Internal Clearances Mean in Service

The cast iron housing provides dimensional stability under the thermal cycling typical of small diesel engines running continuous load in tractors and utility vehicles. Cast iron resists the bore distortion that cheaper sintered housings develop after repeated heat-soak cycles, maintaining gear-to-housing clearance within the tolerance band that sustains oil pressure at idle. Internal gear profiles are finished to match the volumetric flow requirement of the D722 and D902 lubrication circuits — enough volume to feed main bearings, the cam journal and the rocker shaft without excessive bypass that would waste parasitic engine power. When replacing a worn pump, checking these clearances against service manual limits confirms whether the fault was normal wear or a system-level issue such as contaminated oil.

The Hidden Cost of Shipping Back a Pump That Almost Fits

A pump with the wrong port clock position or mismatched spline will sometimes bolt to the block but leave the oil gallery misaligned, producing a no-pressure condition on first start. The machine is then partially reassembled, fluid has been added, and the removal process must be reversed — doubling the labour hours and extending downtime. In fleet environments where several machines share the D722 or D902 platform, a single misidentified pump can cascade across scheduled maintenance if the same incorrect cross-reference is applied to every unit. [NEED_CITE: rework cost multipliers from misidentified engine components in fleet maintenance]

Why Buyers Source This Oil Pump 16851-35012 Through Our Account

Own production on selected lubrication lines and qualified sourced supply from ISO-certified partners sit under a single account with identical warranty terms, so you do not juggle multiple vendors for one repair list. Our eight-category catalogue means seals, gaskets, filters and adjacent engine components ship in the same consignment. We accept orders from one piece, removing minimum-order barriers for single-machine emergencies. Guangzhou warehouse stock enables fast dispatch on commonly ordered variants. Part identification works from a part number, a machine model like BX2360 or RTV900, a photograph of the old unit, or a nameplate image when paint has obscured the stamping. Cross-reference verification covers every superseded and alternate number listed above, and sample supply lets you confirm fitment before committing a bulk order.

Documentation & Verification

• Commercial invoice and packing list referencing 16851-35012 and applicable engine models
• Cross-reference sheet mapping superseded numbers to engine serial ranges (reference only)
• Dimensional inspection record covering port position, spline count and bolt pattern
• 3-month warranty terms covering material and manufacturing defects
• Packing photographs showing part labelling and protective wrapping before crate closure
• HS code and customs classification support for export documentation

Fitment Check Before Installation

• Compare port clock position on new pump against removed unit or engine gallery photo
• Count drive spline teeth and match against the cross-reference sheet for your serial range
• Verify mounting bolt hole spacing with calipers before applying gasket sealant
• Trial-fit without sealant first to confirm flange seats flush against the block face
• If spline or port does not match, photograph both sides and return for re-identification

Inquiry Guidance for Accurate Identification

Provide the machine model — for example KX018-4, RTV900G, or BX2360 — along with the engine serial number if the nameplate is legible. When the plate is worn or painted over, send a photograph of the old pump showing the port position and drive spline. We cross-check against our verified reference table and confirm which variant matches your specific build before quoting.

Frequently Asked Questions

Q: How do I confirm which reference number fits my specific engine among 16851-35010, 16851-35012, and 16851-35014?

A: Share your engine serial number or machine model with us. We map each reference to the serial ranges where it applies, then verify port clock position and spline tooth count against that specific build. This eliminates guesswork when legacy manuals show an older number that has since been superseded.

Q: My old pump is stamped 15841-35010 — is it still interchangeable with the current part?

A: Yes, 15841-35010 is an earlier superseded reference that interchanges with 16851-35012 on specific engine serial ranges, primarily earlier D722 builds in B-series tractors. We confirm applicability by checking your machine model and serial against our cross-reference sheet before dispatch.

Q: I only have the machine model, such as KX018-4, not the engine number — can you still identify the correct pump?

A: In most cases yes. We maintain fitment records linking machine chassis to engine variants, including port and spline configuration. Send the machine model and, if possible, a photo of the old pump so we can cross-verify visually before confirming.

Q: Why do some aftermarket listings show different port positions for the same base number?

A: Kubota revised the oil gallery layout across D722 and D902 production runs, requiring the pump port to be clocked differently for each variant. Sellers who collapse all variants under one listing create this confusion. We identify your specific variant before shipping.

Q: Can I order a sample to check fitment before placing a bulk order for my fleet?

A: Yes. Single-piece sample orders ship under the same warranty and documentation terms. This is particularly useful when standardising oil pump sourcing across mixed fleets spanning tractors, excavators, and utility vehicles on the D722 or D902 platform.