Crankshaft 1G962-23012 Compatible with Kubota D902 – Model-Matched

Verified Variant Fitment — cross-reference chain and serial-range checks prevent ordering the wrong crankshaft for your Kubota D902 or WG972 build.

Technical Specifications

Application Suitability

Why the Same Crankshaft Number Maps to Several Kubota Builds

Crankshaft 1G962-23012 fits Kubota D902 and WG972 engines, but variant suffixes change the internal geometry.

Kubota crankshaft part numbers have been superseded across generations, and the same base number often maps to multiple engine variants with subtle dimensional differences. I have seen workshops order by the part number stamped on an old crankshaft, only to discover that the oil gallery drilling pattern differs between a D902 and a WG972-G-E3-HYD-1 build. The result is a crankshaft that physically bolts in but starves one main bearing of oil, leading to rapid shell failure [NEED_CITE: engine oil gallery design variation across Kubota compact diesel families]. Cross-reference tables copied between sellers carry these errors forward, so a listing that shows 1G820-23030 as interchangeable does not guarantee every dimensional detail matches your specific engine serial range.

Serial-Range Identification When the Nameplate Is Gone

When the machine nameplate is rusted through or painted over, the model designation alone becomes the starting point for Crankshaft 1G962-23012 identification. A KX018-4 compact excavator left outdoors for several seasons may have no legible serial plate, but the engine block casting marks and the existing crankshaft's physical features—journal count, counterweight profile, and flange bolt pattern—narrow the field. We compare photographs of your removed crankshaft against known variant profiles to confirm which WG972 sub-model your machine uses. This is especially important for the RTV900 family, where the same base machine model can carry different engine builds depending on production year.

Interface Verification Beyond the Part Number

The physical fitment of a replacement crankshaft depends on several interfaces that part numbers alone do not capture. The main journal diameter must match the bearing shells already in your block, or the block must be machined to accept the new journal size. The PTO-end spline or flange must align with your existing hydraulic pump or transmission coupling. On the BX series tractors, the crankshaft front-end keyway position determines pulley alignment for the belt drive system [NEED_CITE: crankshaft-to-pulley alignment tolerance in compact tractor belt drives]. Counterweight bolt torque patterns also vary between variants, so reusing the original fasteners on a different counterweight profile risks fatigue cracking. Requesting a sample unit for trial fitment before committing to a bulk order removes the guesswork from each of these interfaces.

Reading the Specifications That Matter in the Field

The forged steel construction of this crankshaft provides the core strength needed to handle the torsional loads in three-cylinder compact diesel engines. A hardness range of HB 220-250 places the journal surfaces in a range that resists abrasive wear from contaminated oil while still allowing bearing shells to embed minor debris without scoring. The Ra 0.8μm mirror-polished finish on the main and rod journals is not cosmetic; it directly controls the oil film thickness at operating temperature, reducing boundary contact during cold starts when oil pressure is still building [NEED_CITE: surface roughness effect on hydrodynamic bearing film in small-bore diesel engines]. The oil gallery drilling pattern is the specification most frequently overlooked during cross-reference matching. A variant intended for a WG972-GL-E3-GNI-1 may have a different gallery branch feeding the number-two main bearing compared to a WG972-G-E3-MRG-1 build, even though both share the same base crankshaft casting.

What Happens When Fitment Goes Wrong

A crankshaft that physically installs but has the wrong oil gallery layout will not show symptoms at first start-up. The machine may run for hours or even weeks before a starved main bearing begins to overheat, typically manifesting as a knock that gets dismissed as normal engine noise on older equipment. By the time the bearing shell spins, the journal surface is scored beyond polish-repair and the connecting rod is distorted. In a compact excavator like the KX41-3, pulling the engine to replace a crankshaft means disconnecting hydraulic lines, removing the pump, and lifting the engine from a tight bay [NEED_CITE: engine removal procedure for compact excavator D902 platform]. The downtime cost on a machine that was already scheduled for a simple bearing replacement far exceeds the price of verifying fitment before the order was placed. A forced fit on a flange that is close but not exact introduces runout that accelerates seal wear at the rear main, leading to oil leaks that bring the machine back into the shop within months.

Why Buyers Source This Crankshaft Through XUNPO

The identification process starts from whatever you have—a part number, a machine model, a photograph of a worn crankshaft, or a blurred nameplate image—and narrows down to the correct variant. Cross-reference verification covers superseded numbers including 1G820-23030 and 1G962-23010, resolving conflicts between different seller listings. Own production on selected crankshaft lines and qualified sourced supply from ISO-certified factories operate under a single warranty, so accountability is not split between manufacturers. A single-piece minimum order means you can procure one unit for a machine-down emergency or request a sample for fitment confirmation before placing a fleet-level order. The Guangzhou warehouse stocks common items for fast dispatch, and the technical team confirms journal dimensions, spline counts, and oil gallery layouts against your specific engine build before anything ships.

Documentation & Verification

• Commercial invoice listing each cross-reference number (1G820-23030, 1G962-23010) with reference-only designation
• Fitment sheet matching your machine serial to the confirmed WG972 or D902 engine variant
• Dimensional inspection record covering journal diameter, oil gallery port positions, and spline count
• Warranty terms covering material and manufacturing defects for 3-12 months from delivery
• Packing photographs documenting crate condition and part markings before dispatch
• HS code and customs documentation support for cross-border shipment clearance

Fitment Check Before Installation

• Measure main journal diameters with a micrometer and compare against your block's bearing bore size before assembly
• Verify oil gallery port positions by aligning the new crankshaft beside the removed unit and checking drill angles
• Confirm rear flange bolt circle diameter and spline tooth count match the existing transmission or pump coupling
• Trial-fit the crankshaft into the block with Plastigauge on main and rod bearings to verify clearance
• If any dimension does not match, halt installation and contact the technical team for variant re-identification

Confirming the Right Crankshaft for Your Machine

Provide your machine model, engine serial number, and any available photographs of the existing crankshaft or nameplate. If the part number is partially legible, include a close-up image so the cross-reference chain can be verified against the superseded numbers. Our technical team will return a confirmed variant match with the applicable fitment notes before you commit to an order.

Frequently Asked Questions

Q: How do I confirm this crankshaft fits my specific Kubota machine when the nameplate is unreadable? A: Send photographs of the engine block casting marks, the removed crankshaft's flange end, and any remaining serial stamps on the block. We cross-reference these physical features against known D902 and WG972 variant profiles to identify your exact build, then confirm journal dimensions and oil gallery layout before you order.

Q: Part number 1G820-23030 was listed for my machine—does 1G962-23012 replace it? A: Yes, 1G820-23030 appears in the cross-reference chain as an interchange reference for 1G962-23012. However, Kubota superseded this number across multiple production runs, so we still verify your engine serial range to confirm the oil gallery pattern and flange interface match your specific machine build.

Q: Why does the same base number appear with different suffixes across WG972 variants? A: Suffixes like HYD-1, MRG-1, and GNI-1 identify different equipment applications and emissions configurations. Each may use a slightly different oil gallery drilling pattern or balance weight specification. We match the suffix on your engine block to the correct crankshaft variant to avoid fitment issues.

Q: Can I order a single sample to test fitment before buying in quantity? A: Yes, single-piece orders are accepted with no minimum order quantity. Distributors and rebuild shops routinely order one Crankshaft 1G962-23012 unit for physical trial fitment in a specific engine build before committing to larger batch procurement.

Q: What do I do if the cross-reference table I found online doesn't match your listing? A: Online cross-reference tables are frequently copied between sellers without verification, carrying forward errors in superseded numbers. Provide us with the conflicting references and your machine serial number. We independently verify the chain against factory documentation and confirm which numbers apply to your build.