Verified Serial Variants — cross-reference mapping confirms port orientation differences across V3307 production runs before this Water Pump ships.
Technical Specifications
| Parameter |
Value |
| Part Number |
1G772-73032 |
| Product Type |
Water Pump |
| Cross-Reference (reference only) |
1G772-73030, 1G77273032, 1G77273030, 1G772-13122, 1G77213122, 1G772-73035, 1G772-73033, 1G772-73034, 1G77273035, 1G77273033, 1G77273034, 1G772-13125, 1G77213125 |
| Engine Compatibility |
Kubota V3307, V3307-DI, V3307T |
| Machine Fitment |
KX080-3T, KX080-4, KX080-4S, KX080-4S2, M4-071HDC12, M4D-061HDC12, M4D-071HDC12, M5040DT, M5040DT-1, M5040DTC, M5040DTC-1, M5040F, M5040F-1, M5040FC, M5040FC-1, M5040HD, M5040HD-1, M5040HDC, M5040HDC-1, M6040DT, M6040DT-1, M6040DTC, M6040DTC-1, M6040F, M6040F-1, M6040FC, M6040FC-1, M6040HD, M6040HD-1, M6040HDC, M6040HDC-1, M6040HDNB, M6040HDNB-1, M6060HD, M6060HDC, M6060HFC, M7040DT, M7040DT-1, M7040DTC, M7040DTC-1, M7040F, M7040F-1, M7040FC, M7040FC-1, M7040HD, M7040HD-1, M7040HDC, M7040HDC-1, M7040HDC-LTD, M7040HDNB, M7040HDNB-1, M7040HDNBC, M7040SU, M7040SUD, M7040SUH, M7040SUHD, M7060HD, M7060HD12, M7060HDC, M7060HDC12, M7060HFC, SSV75, SSV75C, SSV75P, SSV75PC, SVL75, SVL75-2, SVL75-2C, SVL75-3, SVL75-3C, SVL75C |
| Housing Material |
Cast iron |
| Condition |
New Aftermarket |
| Quality Standard |
ISO |
| Warranty |
3-12 months against manufacturing defects |
Application Suitability
| Engine System |
Related Components |
| Primary coolant circulation |
Thermostat, radiator cap, coolant hoses |
| Block-to-pump sealing interface |
Mounting gasket, seal kit, fastener set |
| Overhaul cooling circuit refresh |
Fan belt, tensioner, bypass pipe, coolant |
| Post-rebuild break-in cooling |
Temperature sender, coolant filter (if equipped) |
Why Overheating Returns After a Water Pump Swap
The new pump masks a system fault it did not cause.
Replacing the Water Pump engine rebuild replacement unit without tracing the thermal fault upstream and downstream leads to repeat failure within a single service season. A stuck thermostat starves the new pump of flow, causing localized cavitation on the impeller. A partially blocked radiator forces the pump to work against higher back-pressure, accelerating bearing wear. Degraded hose inner linings shed particles that score the new pump seal. [NEED_CITE: engine cooling system root cause analysis for overheating diagnosis] The Water Pump engine rebuild replacement fits and spins correctly, yet the same symptoms reappear because the underlying cause was never addressed.
Cooling Circuit Component Matching
This Water Pump engine rebuild replacement operates as part of an interdependent loop. The thermostat must open at the specified temperature to allow flow through the radiator; if it fails closed, the pump recirculates hot coolant within the block. Radiator cap pressure rating must match the system design to prevent coolant boil-off at operating temperature. Hose condition affects more than leak risk — swollen inner walls restrict flow volume and create turbulence that erodes pump internals. Every connected component must be verified during the same service event.
Engine Serial Variants and Production Run Differences
Within the V3307 family, production run changes alter port orientation, mounting bolt pattern, and pulley alignment. A Water Pump engine rebuild replacement specified for an early serial range may physically bolt on but misalign the drive belt, causing premature belt wear and pump bearing load. Superseded reference numbers such as 1G772-73030 and 1G772-73035 reflect these running changes. Ordering by machine model alone risks receiving a variant with offset inlet or outlet positioning that does not match the existing hose routing. [NEED_CITE: engine serial variant cross-reference verification methods] Confirming engine serial number against the cross-reference sheet prevents this mismatch before the old pump is removed.
Dimensional and Material Considerations for Rebuild Context
Cast iron housing provides the thermal mass and corrosion resistance required for continuous duty in high-ambient environments typical of Middle East construction and agricultural operations. The impeller must maintain precise clearance to the housing volute — excessive clearance reduces flow volume, while contact causes scoring and seizure. Bearing grade determines load capacity for the belt-driven lateral force; undersized bearings fail under continuous tension. Gasket surface flatness on the mounting face must meet sealing requirements to prevent coolant loss at the block interface.
The Cost of Mismatched Components
A pump ordered without confirming serial variant arrives with ports that do not align to the existing hose routing. The technician either forces hoses into incorrect angles — stressing clamps and creating leak paths — or returns the unit and waits for a replacement. A pump installed alongside a failing thermostat sees repeated cavitation damage within weeks. Grade-mismatched bearings produce audible noise before catastrophic seizure, but in remote site conditions that noise goes unnoticed until coolant loss shuts the engine down. [NEED_CITE: water pump bearing failure modes in diesel engine cooling systems]
Why Source This Water Pump Engine Rebuild Replacement Here
Self-produced and qualified sourced lines carry identical warranty terms under one account, so this Water Pump engine rebuild replacement and associated overhaul components share the same quality documentation. Eight product categories allow a complete engine rebuild order — from piston sets to this pump to seal kits — to ship as one consignment. Part identification proceeds from number, machine model, photograph, or nameplate image, covering situations where the original plate is worn or painted over. Cross-reference verification addresses superseded and alternate numbers across production runs. Sample supply is available for fitment confirmation before bulk commitment. Technical team support covers compatibility and grade confirmation for engines with previous rebuild history.
Documentation & Verification
- Commercial invoice and packing list itemizing each Water Pump engine rebuild replacement unit by reference number
- Compatibility sheet listing confirmed engine serial ranges and cross-reference numbers marked as reference only
- Dimensional inspection record covering port spacing, mounting hole pattern, and housing flatness
- Warranty terms document specifying coverage period and manufacturing defect conditions
- Packing photographs showing protective wrapping and carton condition before dispatch
- HS code and customs documentation support for cross-border shipment
Installation & Rebuild Sequence
- Clean block mounting surface to bare metal before positioning the new gasket and pump assembly
- Verify drive belt alignment with pulley grooves after initial finger-tight fastener installation
- Torque mounting bolts in cross-pattern sequence to the engine manufacturer specification
- Fill and bleed the cooling system, checking for air pockets at the thermostat housing
- Run the engine to operating temperature and confirm thermostat opening by radiator hose temperature change
- Inspect pump mounting face and all hose connections for seepage after a full thermal cycle
Requesting a Fitment Confirmation
Provide the engine model, serial number, and any previous rebuild history to confirm which reference number variant matches your specific build. Photographs of the existing pump mounting face, port positions, and any legible nameplate data allow verification without relying on potentially superseded part numbers alone.
Frequently Asked Questions
Q: What other cooling components should be replaced alongside this water pump during a rebuild?
A: The thermostat, radiator cap, drive belt, and all coolant hoses should be evaluated during the same service event. A stuck thermostat or degraded hose lining will damage a new pump quickly. We recommend including matched seals and gaskets in the same order to avoid partial teardowns.
Q: How do I confirm which cross-reference number applies to my engine serial?
A: Provide your engine serial number and any visible reference marking from the old pump. Our cross-reference verification covers superseded numbers across V3307 production runs, confirming port orientation and mounting pattern match your specific build before shipment.
Q: What causes repeated pump failure after a seemingly correct replacement?
A: Unresolved system faults — blocked radiator passages, stuck thermostat, degraded hose linings shedding debris, or incorrect belt tension — all transfer destructive loads to the new pump. Diagnosing and addressing these upstream causes during the same rebuild prevents repeat failures within the same service cycle.
Q: Are mounting gaskets and seals included with this water pump unit?
A: Inclusion varies by configuration. Confirm whether the seal and gasket set ships with the pump or must be ordered as a separate line item. Ordering matched sealing components together ensures material compatibility and avoids installation delays waiting for separate deliveries.
Q: Can I order a sample unit to verify fitment before committing to bulk quantities?
A: Sample supply is available for fitment confirmation. This is particularly useful when dealing with V3307 serial variants where port orientation or mounting pattern differs between production runs. The sample allows physical trial fitment on the engine before a larger rebuild order is placed.
