129004-42001 129508-42001 Water Pump, for Yanmar 4TNV88 3TNV88 4TNV84 Engine, Replacement Engine Water Pump for Takeuchi TB135 TB145 Komatsu PC50 PC58

Product SpecificationsPart Numbers: 129004-42001, 129508-42001, YM129004-42001, YM129508-42001, 129001-42001, 129001-42002, 129001-42003, 129001-42004Product Type: Engine water pumpImpeller Type: Cast metalDrive Type: Belt driven or gear drivenHousing Material: Cast iron or aluminumSeal Type: Mechanical sealBearing Type: Sealed ball bearingCompatible with Yanmar EnginesFor Yanmar 3TNV84, 3TNV88 (3-cylinder, 1.0-1.1L)For Yanmar 4TNV84, 4TNV88 (4-cylinder, 1.3-1.5L)For Yanmar 4TNV84-GGE (industrial generator engine)For Yanmar 3D84E, 4D88EFor Yanmar 3TNE84, 3TNE88, 4TNE84, 4TNE88For Yanmar TK486Compatible Equipment (With Yanmar Engines)For Takeuchi: TB135, TB145, B37V, B50-2A, B50V, VIO50For Komatsu: PC30MR-1, PC38UU, PC50, PC58, SK820, SK815Other: For Yanmar excavators, skid steer loaders, marine boats, generatorsWater Pump Function on Yanmar EnginesCoolant Circulation: The 129004-42001 pump moves coolant through engine block, cylinder head, and radiatorHeat Transfer: Coolant absorbs heat from engine and releases it through radiatorDrive Mechanism: Pump impeller rotates at engine speed (belt or gear driven on your 4TNV88)Seal Protection: Mechanical seal prevents coolant leakage past the shaft on your YanmarFailure Impact: Failed 129508-42001 pump causes overheating, coolant loss, or bearing seizure

• 📋 Part Number Verification - 129004-42001 water pump replaces for Yanmar numbers 129004-42001, 129508-42001, YM129004-42001, and YM129508-42001. Also fits 129001-42001, 129001-42002, 129001-42003, 129001-42004. Verify your old pump matches one of these numbers before ordering this 129004-42001 water pump for Yanmar engine.
• 🚜 For Yanmar Engine Compatibility - 129508-42001 water pump fits for Yanmar 4TNV88, 3TNV88, 4TNV84, and 4TNV84-GGE diesel engines. Compatible with 3D84E, 4D88E, 3TNE84, 3TNE88, 4TNE84, 4TNE88 engine models. Used for Yanmar excavators, skid steer loaders, marine boats, and generators. The 129004-42001 pump is direct drive.
• ⛏️ For Takeuchi & For Komatsu Fitment - Water pump fits for Takeuchi TB135, TB145, B37V, B50-2A, B50V, VIO50 excavators and skid steers with Yanmar engines. Also compatible with Komatsu PC30MR-1, PC38UU, PC50, PC58, SK820, SK815 models using 3TNV/4TNV for Yanmar engines. The 129508-42001 water pump is a direct replacement for these applications.
• ⚠️ Engine Cooling Function - 129004-42001 water pump circulates coolant through the for Yanmar engine block, cylinder head, and radiator. The pump is driven by the engine's belt or gear system. A failed water pump on your 4TNV88 engine causes overheating, coolant leaks, or bearing noise. Replace 129508-42001 pump immediately when symptoms appear to prevent engine damage.
• 🔧 Installation Note - Installing 129004-42001 water pump requires draining coolant for Yanmar engine. New gasket required (verify if included). Torque mounting bolts to factory specification (typically 15-20 Nm for these pumps). Use new O-rings on coolant passages. After installing 129508-42001 pump on your 4TNV84 engine, refill with correct coolant type and bleed air from cooling system.