In Stock Water Pump CH12859 for Yanmar 3T80-J 3T90-J
Water Pump CH12859 with Gasket, Precision-cast Aluminum Impeller — fits Yanmar 3T80-J,...
Water Pump 1E051-73036 for Kubota D722/D902, ≥28 L/min Flow Rate — replacement for Kubota compact tractors, UTVs, and zero-turn mowers including BX1880, RTV-X900, and ZD1011 series.
Dispatch timeline quoted at payment based on your destination and freight preference.
Ready From Guangzhou Stock — Deep inventory of this Kubota-compatible water pump sits in our Pearl River Delta warehouse, enabling same-day dispatch for emergency cooling system repairs.
| Parameter | Value |
|---|---|
| Product Type | Water Pump |
| Part Number | 1E051-73036 |
| Cross-Reference (reference only) | 1E051-73036, 16871-73430 |
| Machine Fitment | Kubota BX1880, BX1880-1, GR2120-2, GR2120B-2, SCL1000, RTV-X900G, RTV-X900R, RTV-X900W, ZD1011, ZD1011-3, ZD1021, ZD1021-3, ZD1011-AU |
| Engine Compatibility | Kubota D722, D902 |
| Assembly State | New Aftermarket, supplied with gasket (16871-73430) |
| Impeller Material | High-silicon aluminum alloy (A380) |
| Housing Treatment | T6 heat-treated |
| Flow Rate | ≥28 L/min at 2,000 RPM |
| Pressure Seal Validation | 1.2 bar |
| Thermal Cycling Range | -20°C to +105°C |
| Dimensional Tolerance | ±0.05 mm on mounting surfaces and bore IDs |
| Shaft Seal Design | Dual ceramic/metal face |
| Balance Standard | ISO 1940-1 G2.5 |
| Certification | ISO 9001 |
| Warranty | 6 months against manufacturing defects |
| MOQ | 1 piece |
| Failure Symptom | Replacement Urgency |
|---|---|
| Engine coolant temperature rising steadily under load | Immediate — machine must be shut down to prevent head gasket failure or warped cylinder head |
| Visible coolant leak at weep hole beneath pump housing | Same-day replacement required before resuming operation |
| Coolant loss with no external leak visible | Urgent — internal seal failure allows coolant migration into oil system |
| Overheating during continuous mowing or transport cycles | Schedule replacement at next available maintenance window before peak season demand |
| Unusual grinding noise from front of engine block | Immediate inspection and replacement to avoid bearing seizure and shaft damage |
A verified replacement water pump 1E051-73036 from Guangzhou warehouse stock, dispatched the same day your order is confirmed.
When an engine overheats on a jobsite or during peak mowing season, every hour of downtime costs real money in missed deadlines and idle crews. The OEM dealer channel often quotes multi-week lead times for cooling system components, forcing operators to park machines that are otherwise fully functional. Waiting for a backordered part while summer grass grows or a contracted grading job slips is not a theoretical problem — it is the daily reality for equipment-dependent businesses. [NEED_CITE: equipment downtime costs for small contractors during peak operating season]
This water pump replacement for Kubota D722 and D902 engines addresses that gap directly. We hold stock specifically because cooling failures do not wait for convenient procurement cycles. A landscaping crew with a downed zero-turn mower or a utility vehicle stuck mid-haul needs a part on a truck today, not a catalog estimate.
Part identification is often the bottleneck that delays urgent repairs. Nameplates fade under years of heat exposure, paint overspray obscures casting numbers, and machine models span multiple production runs with different internal configurations. A Water Pump 1E051-73036 ordered against an assumed model number can arrive wrong, turning a one-day repair into a week-long setback.
Our Guangzhou warehouse team confirms fitment from whatever evidence you can provide: a clear part number, a machine model, or even a photograph of the worn nameplate. We have identified the correct Kubota-compatible water pump from images so blurred that only the engine block silhouette was visible — and matched it accurately to the D722 series. This confirmation step happens before dispatch, not after the wrong part arrives on site.
Once the correct part is confirmed and payment processed, the water pump leaves our Guangzhou facility the same working day for orders placed before the daily cutoff. Express courier delivery reaches most international destinations within a matter of days, while air freight offers a cost-effective alternative for slightly longer transit windows. Sea freight remains available for non-urgent restocking.
Every shipment includes a pre-packed gasket matched to the pump housing, eliminating the scenario where the pump arrives but installation stalls because the seal was not ordered. The package is prepared for courier handling with protective cradling around the impeller and shaft seal surfaces, so the part arrives in installable condition. Transit timelines are quoted at the point of order confirmation — not discovered after checkout. [NEED_CITE: international express freight transit windows from Southern China to major equipment markets]
The impeller is cast from high-silicon A380 aluminum alloy, chosen for its dimensional stability under the thermal cycling that cooling systems endure. Silicon content reduces thermal expansion coefficient, meaning the clearance between impeller tips and housing remains consistent from cold start through full operating temperature. This consistency is what sustains the rated flow of at least 28 liters per minute at 2,000 RPM across the entire operating envelope.
The housing undergoes T6 heat treatment, a solution-aging process that maximizes yield strength in the aluminum casting. This matters because the housing bears the clamping load of mounting bolts while resisting distortion from coolant pressure pulses generated by the thermostat opening and closing cycles. A housing that distorts under these loads develops micro-leaks at the gasket interface.
The dual ceramic/metal face shaft seal is the component that determines service life more than any other. Ceramic faces resist the abrasive wear caused by suspended particles in coolant, while the metal mating surface provides structural support. This combination handles the full thermal range from -20°C to +105°C without the face degradation that single-material seals experience under repeated heat cycles. Balance to ISO 1940-1 G2.5 standard ensures the rotating assembly does not transmit vibration into the engine front cover bearing.
Sending back an incorrect water pump and waiting for the correct one means the machine sits idle for a second cycle — doubling the downtime that the emergency purchase was meant to minimize. For a commercial mowing operation during peak growth weeks, that second delay can mean missed contracts. For a utility vehicle on a construction site, it means rented replacement equipment costs accumulate while the original machine waits.
Even a pump that physically bolts on but delivers inadequate flow at operating RPM will cause chronic overheating under load, leading to head gasket failure that transforms a straightforward pump swap into a top-end engine overhaul. The margin between correct and incorrect fitment in cooling systems is narrow, and the consequences of guessing scale with machine value and job criticality. [NEED_CITE: cooling system failure progression from water pump to cylinder head damage]
Our Guangzhou warehouse maintains deliberate stock depth on high-failure cooling components because we understand that water pumps fail without warning and machines cannot wait. The 1E051-73036 is among the items we hold in quantity precisely because the machines it serves — compact tractors, UTVs, zero-turn mowers — operate in conditions where overheating carries immediate operational consequences.
Single-piece minimum order means you can order exactly the one pump a downed machine needs without padding a purchase to meet an arbitrary quantity threshold. Part identification from a photograph works because our team has spent years cross-referencing worn nameplates and faded casting marks against Kubota engine families. Every pump ships with its matched gasket and is backed by a six-month warranty covering manufacturing defects. Technical support is available before and after the sale to confirm fitment or address installation questions.
Q: Is this water pump in stock right now and ready to ship? A: Yes, water pump 1E051-73036 is held in our Guangzhou warehouse as a stocked item specifically because Kubota D722 and D902 engine cooling failures require immediate response. Stock status is confirmed at the point of order so you receive accurate availability information before committing to payment. Same-day dispatch applies to orders confirmed before our daily cutoff time.
Q: Can I buy just one unit for an emergency repair? A: Absolutely. Our minimum order quantity is one piece because emergency cooling repairs typically involve a single downed machine, not a fleet overhaul. There is no requirement to purchase in multiples or meet a bulk threshold. One pump with its matched gasket ships as a complete installation-ready package.
Q: How fast will the water pump arrive at my location? A: Transit time depends on destination and chosen freight method. Express courier typically delivers within days to most international markets, while air freight adds modestly to that window. Specific arrival estimates are quoted when you place the order, based on your exact location — not generic estimates discovered after checkout.
Q: My nameplate is unreadable — how do you confirm fitment? A: Send us a photograph of whatever identification remains on the machine or engine block, along with the machine model if known. Our team has years of experience identifying Kubota D722 and D902 engine configurations from partial visual evidence and cross-referencing against the correct pump variant. We confirm fitment before dispatch to prevent wrong-part shipments.
Q: What happens if the part arrives and does not fit my machine? A: Contact us immediately with photographs showing the fitment discrepancy. We will cross-check the supplied part against your machine details and arrange resolution under our warranty and support process. Pre-dispatch fitment confirmation from your provided information significantly reduces this scenario, but we stand behind every shipment with post-delivery technical support.
Not sure if this part fits your machine? Send us your machine model number and serial number via WhatsApp or email -- our specialists will verify compatibility within 2 hours.
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