Water Pump 1E051-73036 for Kubota D722 D902 – Verified Fitment

Verified Cross-Reference — every alternate and superseded number checked against engine serial and port orientation before dispatch.

Technical Specifications

Application Suitability

Why the Same Base Number Fits Some Kubota Machines but Not Others

The part number alone does not guarantee fitment; engine serial range and production variant dictate port orientation and gasket interface.

When sourcing a Water Pump for Kubota D722 D902 cross reference fitment, buyers often assume the base identifier covers every machine in the model family. In practice, production changes across serial ranges shift the inlet and outlet port positions by measurable angles, and a pump that bolts to the block may still misalign the cooling hoses [NEED_CITE: Kubota engine serial variant identification practices for aftermarket parts]. A worn or painted-over nameplate compounds the problem, leaving only the machine model as a starting point. Cross-reference tables copied between sellers frequently carry forward superseded numbers without noting the variant differences, leading to trial fitment on site and avoidable machine downtime.

Mapping the D722 and D902 Serial Variants

The D722 and D902 engines span several Kubota machine lines, from compact tractors to utility vehicles and zero-turn mowers. Each application places different demands on the Water Pump for Kubota D722 D902 cross reference fitment, particularly regarding pulley alignment and hose routing. A pump intended for an RTV-X900 utility vehicle may share the same impeller and bearing specification as one fitted to a ZD1021 mower, yet the port clocking differs enough to prevent hose connection without adapters. Verifying the engine serial against the cross-reference sheet eliminates this mismatch before the unit ships.

Port Orientation and Mating Surface Verification

The most frequent fitment failure on this pump type involves rotational position of the inlet and outlet ports relative to the engine block face. Even when the bolt pattern matches, a port rotated just a few degrees from the expected position forces hose bends that stress clamps and cause early leaks [NEED_CITE: cooling system hose stress and clamp fatigue in compact diesel installations]. The included gasket must also match the block surface profile; a gasket that is too thick shifts the pump body outward, altering belt tension on the pulley shaft. Confirming these interface dimensions against the old unit or a photograph of the block face prevents forced assembly and cracked housings.

Decoding Superseded Numbers and Gasket Cross-References

Numbers like 1E051-73036 and 1E051-73510 (cross-reference only) appear across multiple parts catalogs, yet they do not always indicate a direct swap for every serial range. The associated gasket identifier 16871-73430 (cross-reference only) also appears in different thickness specifications depending on the engine build. A Water Pump for Kubota D722 D902 cross reference fitment requires checking whether the superseded number reflects a port change, a gasket update, or merely a catalog consolidation. Ordering a sample for physical trial fitment resolves ambiguity that no cross-reference table can fully capture.

Reading the Specification Sheet for Real Fitment Impact

The assembly state as new aftermarket means the pump arrives with unworn bearings and a fresh impeller, but the dimensional tolerances must match the D722 or D902 block casting. The included gasket provides the sealing interface; its thickness and bore alignment directly affect coolant flow volume through the block passages. Engine compatibility with both D722 and D902 means the pump housing shares a common bolt pattern, yet the internal passage diameter differs between the two engine families, influencing flow rate at operating RPM [NEED_CITE: coolant flow rate requirements for small displacement diesel engines under continuous load]. Verifying that the impeller blade count and diameter match the original unit ensures the cooling system maintains designed thermal capacity across the full operating range.

The Hidden Cost of a Near-Miss Fitment

A pump that bolts on but misaligns the cooling hoses creates a leak path that manifests only after the machine reaches operating temperature. The resulting coolant loss goes unnoticed until the engine overheats, turning a planned replacement into an unplanned teardown [NEED_CITE: diesel engine overheating damage progression in compact equipment]. Shipping the incorrect unit back and waiting for a replacement extends machine downtime beyond what a single verification step would have prevented. In fleet environments, ordering several pumps on the assumption that one base number covers all variants leads to mixed inventory where only some units fit, tying up capital in unusable stock.

Why Buyers Verify Fitment Here

Our technical team confirms machine model and engine serial against the cross-reference database before any order ships, catching variant mismatches that automated catalogs miss. The eight-category inventory means associated gaskets, thermostat housings, and belt-drive components travel in one consignment, avoiding split deliveries. A single-piece minimum order supports emergency replacement without forcing bulk commitments on slow-moving variants. Guangzhou warehouse stock covers the most common serial ranges for immediate dispatch, while less common variants are sourced with confirmed lead times quoted at inquiry. Sample supply allows physical trial fitment on the bench before a workshop-level bulk purchase is finalized, eliminating guesswork when the machine nameplate is unreadable.

Documentation & Verification

• Commercial invoice listing each machine model and cross-reference number for customs clearance.
• Part compatibility sheet noting which serial ranges apply, marked reference only.
• Dimensional inspection record covering port spacing and bolt pattern before dispatch.
• Warranty terms specifying coverage period against manufacturing defects.
• Packing photographs showing pump and gasket condition prior to crate closure.
• HS code provided for accurate tariff classification at destination.

Fitment Check Before Installation

• Compare inlet and outlet port clocking on the new pump against the removed unit before gasket placement.
• Verify gasket bore alignment with the block coolant passages; a misaligned gasket restricts flow.
• Hand-rotate the impeller shaft to confirm smooth bearing travel and absence of internal contact.
• Torque mounting bolts in sequence to the engine manufacturer specification to avoid housing distortion.
• Run the engine to operating temperature and inspect all hose connections for weeping before returning to service.

Confirm Your Machine Details Before Ordering

Provide the machine model, engine serial number, or a photograph of the existing pump and nameplate so the technical team can verify port orientation and cross-reference coverage. If only the machine model is available, the team cross-checks known variant splits and recommends a sample for physical trial fitment before any bulk commitment is placed.

Frequently Asked Questions

Q: How do I confirm this Water Pump fits my specific Kubota engine serial? A: Send the engine serial number from the nameplate along with the machine model. The technical team cross-checks port orientation and gasket specification against the variant database and returns a fitment confirmation before the order is finalized. This eliminates the risk of receiving a pump that bolts on but misaligns the cooling hoses.

Q: Are the superseded numbers interchangeable for every application? A: Not universally. Some superseded numbers reflect port orientation changes or gasket thickness updates that apply only to specific serial ranges. The cross-reference sheet provided with each order notes which variants each number covers, marked reference only, so buyers can verify applicability before installation.

Q: I only have the machine model and no readable part number — can you identify the pump? A: Yes. Providing the machine model and, ideally, a photograph of the old pump or engine nameplate allows the team to narrow the serial range and confirm the correct variant. A sample can then be dispatched for physical trial fitment before any larger quantity is ordered.

Q: Can I order a sample to verify fitment before committing to a larger quantity? A: Sample supply is available for fitment confirmation on the bench. This is particularly useful for mixed fleets where the same base pump number may appear across several machine variants with different port orientations. Once fitment is confirmed, bulk pricing and consolidated dispatch can be arranged.