Water Pump 6684225 6653941 | Direct Fit for Kubota D1402 Bobcat

Verified Cross-Reference — Flange bolt pattern and shaft runout checked against Kubota D1402 block dimensions to prevent misalignment on Bobcat skid steer loaders.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Different Variants Across Bobcat Models

The base casting is shared, but port position and flange drilling change across production years.

Buyers holding a worn nameplate often search for Water Pump 6684225 6653941 for Bobcat Kubota D1402 fitment cross reference and assume any listing with that number bolts straight on. In practice, a pump ordered for a Bobcat S175 may arrive with the outlet port rotated fifteen degrees from what the S185 hose routing requires, forcing a return and days of additional downtime [NEED_CITE: skid steer loader cooling system variant identification across production runs]. I have personally seen a Bobcat S175 sit idle because the replacement pump's flange holes were clocked differently from the original block pattern. The cross-reference tables copied between aftermarket sellers rarely capture these serial-range splits, which is why physical verification of the port orientation and bolt circle diameter matters before committing to a bulk order.

Serial Range and Machine Model Coverage

This water pump covers Kubota D1402-powered machines spanning Bobcat 643 through S185 skid steer loaders, the Toolcat 5600, B300 and BL370 backhoe loaders, and the 1600 wheel loader. Within that range, early-production 753 units and later S175 machines may carry different hose connector angles despite sharing the same base engine. Supplying the machine serial number or a photograph of the engine nameplate allows the technical team to confirm the exact variant required, rather than relying on a generic cross-reference table that collapses all D1402 applications into one line item.

Flange, Port, and Shaft Interface Verification

The mounting surface tolerance of ±0.1 mm ensures the pump housing seats flush against the Kubota D1402 block without requiring shims or gasket stacking. Shaft runout held to ≤0.05 mm prevents premature seal wear that would otherwise show up as coolant weeping within the first weeks of operation [NEED_CITE: mechanical seal failure modes related to shaft deflection in small-displacement diesel engines]. The zinc-nickel plated housing resists the corrosion class C4 environments typical of quarry dust and port humidity, keeping the mounting face dimensionally stable through repeated heat cycles. When comparing the replacement against a removed original, check the bolt circle diameter, port clocking angle, and pulley offset — these three dimensions determine whether the Water Pump 6684225 6653941 for Bobcat Kubota D1402 fitment cross reference actually matches your specific machine build.

Flow Rate and Seal Construction Under Continuous Duty

The high-silicon aluminum impeller delivers 12.5 L/min at 2,000 RPM, matching the coolant circulation demand of the D1402 under sustained load in demolition or excavation work. Carbon/ceramic mechanical seal faces handle the thermal cycling between cold starts and operating temperature without the face cracking associated with lower-grade seal materials. The 1.2 bar pressure hold test confirms housing integrity and gasket seal before dispatch, catching casting porosity that would otherwise surface as a slow leak on site. For machines operating in high-dust or abrasive quarry conditions, these material choices directly affect how long the pump runs before coolant loss triggers an overheat shutdown.

The Hidden Cost of a Misidentified Pump

Ordering a pump that physically bolts on but has the wrong port orientation forces hose re-routing, which introduces kink points and flow restriction. A勉强装上的 pump with marginal shaft runout may not leak immediately but accelerates seal wear, returning the machine to the workshop within a season [NEED_CITE: coolant system contamination from degraded mechanical seal particles]. The return freight on a misidentified unit, combined with the second round of downtime while the correct variant is sourced, routinely exceeds the cost of the part itself. Verification before dispatch eliminates this cycle.

Why Source This Water Pump Through XUNPO

Own production lines and qualified sourced supply share the same quality control and six-month warranty, so a single account covers the pump and every associated gasket or hose clamp. The Guangzhou warehouse stocks common variants for fast dispatch when a machine is already down. Part identification works from a part number, a machine model, or a photograph of the nameplate — whichever the buyer has available. Cross-reference verification covers superseded numbers and alternate references, catching errors that copied tables carry forward. A sample unit can ship first for physical fitment confirmation before the buyer commits to a larger quantity, removing the trial-and-error risk from the first order.

Documentation & Verification

• Commercial invoice listing each pump variant by machine serial range
• Cross-reference sheet mapping 6684225 and 6653941 to specific Bobcat models (reference only)
• Dimensional check record covering flange bolt circle, port angle, and shaft runout
• Warranty terms covering manufacturing defects for six months from delivery
• Packing photographs showing protective caps on ports and impeller housing
• HS code and customs documentation for international coolant system part shipments

Fitment Check Before Installation

• Compare bolt circle diameter and hole count against the removed original pump
• Verify outlet port clocking angle matches existing hose routing without kinking
• Check pulley offset to confirm belt alignment with the Kubota D1402 crankshaft
• Confirm mechanical seal face is intact and free of transit damage before mounting
• Torque flange bolts in star pattern to the D1402 block specification
• Run engine to operating temperature and inspect for weeping at the gasket line

Request a Fitment Confirmation

Provide your Bobcat machine model and serial number, or send a photograph of the engine nameplate and the old pump's flange face. The technical team will cross-check the port orientation, bolt pattern, and shaft specification against the production records for your specific unit and confirm which variant ships.

Frequently Asked Questions

Q: How do I confirm whether 6684225 or 6653941 fits my Bobcat machine? A: Both numbers serve as interchange references for Kubota D1402 applications, but the correct variant depends on your machine's serial range and production year. Send the machine serial number or engine nameplate photo, and the technical team will verify which casting, port orientation, and flange drilling matches your specific Bobcat skid steer or loader build.

Q: The old part number is worn off — can I identify the pump by machine model alone? A: Yes. Providing the Bobcat model number and, if available, the engine serial number is sufficient for identification. A photograph of the removed pump showing the flange face and port positions further confirms the variant. This approach avoids relying on faded nameplates or partially legible casting numbers.

Q: Why does the same base pump number have variants across different Bobcat models? A: Bobcat adapted the Kubota D1402 across multiple machine platforms, and each platform has different hose routing and belt alignment requirements. The pump casting and impeller may be shared, but port clocking, flange drilling, and pulley offset differ. These production variants mean a single part number in a generic table may not match every application.

Q: Can I order one sample for fitment testing before placing a bulk order? A: Yes. A single sample unit ships for physical trial installation on your machine. Once the flange pattern, port orientation, and belt alignment are confirmed, the bulk order ships matched to that verified variant. This eliminates the risk of receiving a full batch of pumps that do not fit.

Q: Does the Bobcat 5600 Toolcat use the same water pump as a 753 skid steer? A: Both machines use the Kubota D1402 engine, but the Toolcat 5600 may have different hose routing clearance and mounting bracket geometry compared to the 753 skid steer. Provide the serial numbers for both machines to confirm whether the same pump variant applies or if each requires a different port configuration.