Water Pump 1G772-73032 – Fits Kubota V3307 SVL75 M6040

Variant Confirmed by Serial Range — Water Pump 1G772-73032 (cross-reference only) cross-checks port orientation and mounting face against your V3307 build code before dispatch.

Technical Specifications

Application Suitability

Why the Same Water Pump Number Ships in Several Variants

A correct Water Pump for Kubota V3307 / SVL75 / M6040 cross reference fitment depends on the engine build code, not just the base part number.

In Central Asian job sites, I have watched crews unbox a pump that matched the catalog number perfectly, only to find the inlet port rotated ninety degrees from where the hose needed to connect. The Kubota V3307 family spans naturally aspirated, direct-injection, and turbocharged variants, and the same base water pump identifier has been superseded or branched into alternate configurations across production years. A cross-reference table copied from one seller to another often carries forward errors that only surface when the machine is already half-disassembled. Getting the variant wrong does not just delay the repair — it forces a second teardown once the misaligned port causes a coolant leak under load [NEED_CITE: Kubota V3307 engine variant identification by serial prefix].

Serial Range Mapping Across Kubota Machine Generations

Every Water Pump for Kubota V3307 / SVL75 / M6040 cross reference fitment we ship is verified against the specific machine model and engine serial prefix you provide. The KX080-4 excavator, for instance, transitioned through several V3307 sub-variants during its production run, and the water pump housing bolt pattern shifted between early and late serial ranges. We cross-check the fourteen OEM reference numbers — including superseded identifiers like 1G772-13122 and 1G772-13125 (reference only) — against your serial data to isolate the exact variant. This step eliminates the trial-fitment guesswork that plagues aftermarket orders where only a base number was confirmed.

Interface Verification: Port Position, Bolt Spacing, and Gasket Face

Beyond matching a number, physical interface alignment determines whether the pump bolts on and seals correctly. We check inlet and outlet port orientation relative to the mounting face, bolt hole spacing on the housing flange, and the gasket surface finish specification. The Ra 1.6 μm mounting face on this Water Pump for Kubota V3307 / SVL75 / M6040 cross reference fitment matches the original housing tolerance so the gasket compresses evenly without localized weeping. For SVL75 and SVL75-2 track loaders operating in high-vibration conditions, even a minor face mismatch accelerates gasket erosion and introduces coolant loss within the first hundred hours [NEED_CITE: coolant system gasket failure modes in compact track loaders].

Dimensional Tolerances That Matter at Assembly

The ±0.02 mm housing tolerance and ≤0.05 mm shaft runout per DIN 42955 are not abstract specifications — they govern how the impeller sits within the volute and how the mechanical seal tracks under thermal cycling. Excessive runout causes the carbon-ceramic seal faces to wear unevenly, producing a slow drip that operators often ignore until coolant level drops enough to trigger an overheat alarm. The high-silicon A380 aluminum impeller resists cavitation erosion in the high-flow zones, which matters on V3307T turbocharged engines where coolant circulation demand is greater than on the naturally aspirated V3307-DI.

What Happens When the Variant Is Wrong

A pump that bolts on but misaligns the inlet port forces the hose into a sharp bend, creating a restriction that starves the thermostat housing of flow. On M6040 and M7040 tractors pulling continuous PTO loads, this restriction raises cylinder head temperature gradually, often misdiagnosed as a failing thermostat. A second teardown to swap in the correct variant doubles the labor cost and keeps the machine idle for another full shift. Worse, a housing face that does not seat flush against the block creates a micro-gap where coolant seeps into the oil gallery over time, risking bearing damage before the leak is even visible [NEED_CITE: coolant intrusion into lubrication system consequences in diesel engines].

Why Sourcing Through XUNPO Reduces Fitment Risk

XUNPO operates its own production lines on selected part categories and sources the remainder from ISO-certified manufacturing partners — both channels carry identical QC protocols and warranty terms, so this water pump ships under the same inspection regime regardless of origin. Fourteen cross-reference numbers are verified against superseded and alternate listings, not simply copied from a single catalog. Identification works from a part number, a machine model, a photograph of the old unit, or even a painted-over nameplate image. A sample unit is available for trial fitment before you commit to a fleet-level bulk order, so you can confirm port orientation and bolt pattern on one machine before the rest of the consignment ships. The technical team remains available for compatibility and grade confirmation if your engine serial prefix falls in a transitional production range.

Documentation & Verification

• Commercial invoice lists each cross-reference number with reference-only designation for customs clarity
• Fitment sheet maps your machine serial range to the specific V3307 variant confirmed
• Dimensional inspection record covers port spacing, bolt pattern, and shaft runout measurement
• Warranty terms document included, covering manufacturing defects for the stated period
• Packing photographs show the pump crated with face protection before dispatch
• HS code and customs classification support provided for cross-border shipment

Fitment Check Before Installation

• Compare bolt hole spacing on the new pump housing flange against the removed unit before removing the old gasket
• Verify inlet and outlet port clock position matches the existing hose routing on your V3307 variant
• Check the mechanical seal carbon face for any transit damage before mating to the engine block
• Torque housing bolts in the specified sequence to avoid distorting the ±0.02 mm tolerance face
• If port orientation does not match, halt installation and contact us with your engine serial prefix for variant exchange

Requesting the Right Variant for Your Machine

Provide your Kubota machine model, engine serial prefix, or a photograph of the existing pump — including any visible casting numbers — so we can confirm which of the fourteen cross-reference identifiers applies to your specific build. If the nameplate is worn or painted over, a clear image of the machine model badge and the pump housing is usually sufficient for our technical team to isolate the correct variant and verify fitment before anything ships.

Frequently Asked Questions

Q: How do I confirm this pump fits my specific Kubota machine model or serial number? A: Share your machine model and engine serial prefix, or send a photograph of the existing pump and nameplate. We cross-check the fourteen reference numbers against your serial range to confirm the exact V3307 variant — naturally aspirated, DI, or turbocharged — and verify port orientation before shipping.

Q: Are all 14 cross-reference numbers fully interchangeable or do some apply to specific variants only? A: Not all are interchangeable. Numbers like 1G772-73030 and 1G772-73035 (reference only) represent superseded or alternate variants tied to specific production batches and engine sub-models. We isolate the correct one based on your serial data so the housing bolt pattern and port clock position match your machine.

Q: What if my nameplate is worn and I only have the machine model? A: The machine model alone is often enough. Models like the KX080-4 or SVL75-2 correspond to known V3307 serial ranges, and our cross-reference database maps those ranges to the correct pump variant. A photograph of the old pump's casting and port layout helps confirm when serial data is unavailable.

Q: Can I get a sample to verify fitment before placing a bulk order? A: Yes. A single sample unit ships for trial fitment so you can confirm bolt pattern, port position, and gasket seating on one machine. Once verified, the bulk consignment follows under the same QC checks and warranty terms, with the confidence that every unit will install without modification.