Engine Serial Variants Confirmed — cross-reference numbers verified against V3307, V3307-DI, and V3307T build sheets before this Kubota V3307 water pump engine cooling rebuild part leaves the warehouse.
Technical Specifications
| Parameter |
Value |
| Part Number |
1G772-73032 |
| Product Type |
Water Pump |
| Cross-Reference |
1G772-73030, 1G772-13122, 1G772-73035, 1G772-73033, 1G772-73034, 1G772-13125 (reference only) |
| Engine Compatibility |
V3307, V3307-DI, V3307T |
| Machine Fitment |
KX080-3T, KX080-4, KX080-4S, KX080-4S2, M5040DT, M5040DTC, M5040F, M5040FC, M5040HD, M5040HDC, M6040DT, M6040DTC, M6040F, M6040FC, M6040HD, M6040HDC, M6040HDNB, M6060HD, M6060HDC, M6060HFC, M7040DT, M7040DTC, M7040F, M7040FC, M7040HD, M7040HDC, M7040HDNB, M7040HDNBC, M7040SU, M7040SUD, M7040SUH, M7040SUHD, M7060HD, M7060HD12, M7060HDC, M7060HDC12, M7060HFC, SSV75, SSV75C, SSV75P, SSV75PC, SVL75, SVL75-2, SVL75-2C, SVL75-3, SVL75-3C, SVL75C |
| Brand Compatibility |
Kubota |
| Condition |
New Aftermarket |
| Warranty |
3-12 months against manufacturing defects |
Application Suitability
| Engine System |
Related Components |
| Coolant circulation |
Thermostat housing, thermostat, radiator upper and lower hoses |
| Belt drive |
Drive belt, tensioner pulley, belt guard hardware |
| Sealing interface |
Water pump gasket, O-ring set for coolant passages |
| Overhaul support |
Head gasket set, cylinder liner seals, coolant fill and bleed kit |
Why Overheating Returns After a Pump Swap
A Kubota V3307 water pump engine cooling rebuild part solves flow — it does not solve the debris or hot spots that destroyed the last pump.
I once pulled a failed pump off a V3307 rebuild, fitted a fresh unit, and watched the impeller erode again within weeks. The root cause was silicate dropout from old coolant lodging in the block passages, turning the new pump into a sacrificial component. Shops that only swap the pump without flushing the block, replacing the thermostat, and inspecting radiator hoses set themselves up for repeat teardowns [NEED_CITE: cooling system root-cause analysis for diesel engines]. When an engine comes in for a rebuild, the entire cooling circuit needs to be evaluated as one system — not treated as isolated line items on a parts order.
The Cooling Circuit This Pump Belongs To
This water pump sits at the center of the V3307 family cooling loop. Coolant exits the pump into the cylinder block galleries, then rises through the head and into the thermostat housing before routing to the radiator. Any restriction downstream — a stuck thermostat, a collapsing lower hose, a clogged radiator core — forces the pump to work against abnormal back-pressure. That is why we position this Kubota V3307 water pump engine cooling rebuild part inside a matched system supply: pump, thermostat, gasket, and hose set leave together so the rebuild addresses the full circuit.
Serial Variants Within the V3307 Family
The V3307, V3307-DI, and V3307T engines share a common block architecture but differ in port layout and mounting geometry for auxiliary components. The V3307T turbocharged variant, found in SVL75 track loaders and M7040 tractors, places higher thermal demand on the pump and may use a different impeller profile. Ordering without confirming the exact engine serial — whether DI direct injection or turbocharged — risks receiving a pump whose mounting flange or inlet port orientation does not align with your block casting [NEED_CITE: Kubota V3307 engine serial variant identification guide]. Always verify against the engine data plate or provide the serial to our technical team before committing to quantity.
What the Specs Mean for Your Rebuild
The 1G772-73032 carries multiple superseded and alternate cross-reference numbers — 1G772-73030, 1G772-13122, 1G772-73035, and others — reflecting design revisions across production runs. These revisions typically involve changes to the bearing assembly, seal material, or impeller blade count rather than external dimensions. A pump built to the latest revision within this cross-reference chain will incorporate updated sealing that better resists coolant cavitation at sustained high-load operation. The warranty window of 3-12 months against manufacturing defects covers casting porosity, bearing preload errors, and seal seating faults — the failure modes most relevant to early-life pump rejection.
The Cost of Skipping the System Check
Fitting a new pump without inspecting the thermostat is a gamble. A thermostat stuck partially closed raises coolant velocity and temperature at the pump seal face, accelerating the very wear pattern you just paid to eliminate. Shops that skip the hose inspection discover collapsed lower hoses on first pressurization, triggering an emergency re-order that delays the machine from returning to service [NEED_CITE: diesel engine coolant hose collapse under vacuum conditions]. Every return visit for a cooling fault that should have been caught during rebuild erodes the customer's confidence in your workshop.
Why Rebuild Shops Source This Through Us
Our own production lines and qualified sourced supply both carry the same QC and warranty terms, so you never need to ask which channel a particular pump came from. Eight product categories under one account mean the thermostat, hoses, gasket set, and belt drive components ship on the same commercial invoice. We start from one piece — no minimum order blocking an emergency single-pump replacement. Guangzhou warehouse stock on high-turnover V3307 items supports fast dispatch. Part identification works from the number, the machine model, a photograph of the old pump, or an image of the engine nameplate. Cross-reference verification covers superseded and alternate numbers in the 1G772 series chain. We supply samples for fitment confirmation before you commit to bulk. Our technical team confirms compatibility and variant selection for V3307-DI versus V3307T applications.
Documentation & Verification
- Commercial invoice listing each cooling component by its own line-item part number
- Cross-reference sheet mapping 1G772-73032 and all alternate numbers, marked reference only
- Dimensional inspection record covering flange bolt pattern and port alignment
- Warranty terms stating coverage period and defect scope for each component
- Packing photographs showing pump, gasket, and thermostat before crate closure
- HS code and customs documentation support for international cooling system shipments
Installation & Rebuild Sequence
- Flush block coolant passages before pump installation to remove casting sand and silicate residue
- Fit new gasket dry — no sealant — to preserve designed compression thickness on the V3307 mating face
- Torque pump mounting bolts in star pattern to the engine manual specification to avoid flange distortion
- Replace thermostat concurrently and verify opening temperature matches the V3307T or V3307-DI rating
- Bleed the cooling system fully after refill; trapped air pockets cause localized hot spots that damage the new impeller
Requesting a System-Level Quote
Send us the engine model and serial number — V3307, V3307-DI, or V3307T — along with any rebuild history such as previous oversize machining or liner replacement. If the nameplate is illegible, a photograph of the old pump and the block casting number is enough for our team to confirm variant fitment. We will return a consolidated cooling system parts list with matched gaskets, thermostat, and seals sized to your exact engine build.
Frequently Asked Questions
Q: What else should be replaced when changing this water pump?
A: Plan to replace the thermostat, both radiator hoses, the drive belt, and the pump mounting gasket in the same job. On V3307 engines with unknown service history, flushing the block and inspecting the radiator core for internal scaling should also be completed. This prevents the new pump from failing against the same restriction that destroyed the previous unit.
Q: Do V3307-DI and V3307T use the same pump or different variants?
A: They share the same base part number family, but the turbocharged V3307T may require a variant with different impeller geometry or bearing specification to handle elevated thermal load. Always confirm the exact engine serial before ordering to ensure port orientation and flange pattern match your specific block casting.
Q: Why are there so many cross-reference numbers for one pump?
A: The 1G772-73030, 1G772-13122, 1G772-73035, and other numbers reflect design revisions across Kubota production runs. Changes typically involve seal material upgrades or bearing assembly improvements while maintaining the same external mounting dimensions. We verify all listed numbers against current application data to ensure correct fitment.
Q: Can I get a complete cooling system rebuild kit in one shipment?
A: Yes. We consolidate the pump, thermostat, gaskets, hoses, and belt into a single consignment under one commercial invoice. This eliminates split freight charges and ensures all components arrive together so the engine rebuild can proceed without waiting on a second delivery.
Q: How do I confirm the exact engine serial to order the right variant?
A: Check the engine data plate on the valve cover or block side. If the plate is worn or painted over, send us a photograph of the old pump flange pattern and the machine model such as SVL75 or M7040. Our technical team cross-references these details against build records to confirm the correct variant.
