8-94170-125-3 Water Pump for Komatsu 4JG2-1-F Forklift

Overview

The 8-94170-125-3 PUMP ASS’Y,WATER J130001- is a complete water pump assembly designed for Komatsu forklift equipment fitted with the 4JG2-1-F engine. As the core of the engine cooling system, the water pump circulates coolant between the engine block and the radiator, keeping operating temperatures stable through long shifts and heavy loads. When a water pump begins to fail — often signaled by coolant leaks, bearing noise, or rising temperature readings — prompt replacement helps you avoid overheating, head gasket damage, and unplanned downtime. This Komatsu replacement pump assembly is intended to match the original unit in fit and function, making it a dependable choice for both scheduled maintenance and urgent repairs.

Compatibility

• Fits model: 4JG2-1-F
• Part number: 8-94170-125-3
• Part name: PUMP ASS’Y,WATER J130001-
• Brand: Komatsu

The 8-94170-125-3 for 4JG2-1-F is intended for machines using this engine configuration. Because forklift model codes and engine variants can vary by serial number and market, we recommend confirming your machine’s serial number and comparing the number on your existing pump against 8-94170-125-3 before ordering. If you are unsure, share your data plate details with our parts specialists and we will help verify fitment.

Quality and Reliability

A water pump operates in one of the harshest areas of the engine, exposed to constant heat, coolant pressure, and vibration. This replacement assembly follows the Komatsu original design for housing dimensions, impeller geometry, and sealing surfaces, so it installs without modification and supports consistent coolant flow. Fitting the correctly specified 8-94170-125-3 helps maintain stable engine temperature, protects hoses, gaskets, and seals from heat stress, and supports the service life of your 4JG2-1-F engine. For commercial fleets and single-truck operations alike, using properly specified components reduces the risk of repeat failures and lost working hours.

Installation and Maintenance Tips

• Allow the engine to cool fully, then relieve cooling system pressure and drain the coolant into a clean container.
• Compare the old pump with the new 8-94170-125-3 to confirm identical mounting, hub, and gasket surfaces before installation.
• Always fit a new gasket and follow the manufacturer’s torque sequence for the retaining bolts.
• Inspect the drive belt, pulley, and thermostat while the pump is accessible, and replace any worn components at the same time.
• Refill with the correct coolant mixture, bleed air from the system, and monitor coolant level and temperature closely during the first hours of operation.

Work should be carried out by a qualified technician in line with your service manual.

Why Order from Us

for liftpartssearch.com focuses on forklift replacement parts, so every listing is built around accurate part numbers and real machine compatibility. When you order the 8-94170-125-3 PUMP ASS’Y,WATER J130001-, you benefit from clear product data, support from specialists who understand Komatsu equipment, and help with cross-referencing part numbers when the original marking is worn or unreadable. Whether you maintain one forklift or an entire fleet, we make it straightforward to find, verify, and order the right component — and get your 4JG2-1-F machine back to work with confidence.