What is the first check for this task?

Freeze machine, engine and old-pump identity. This first check matters because the rest of the workflow assumes the correct item, information and starting condition.

What result should be written down?

Record the result of “Schedule a follow-up check after operating temperature and load.” together with the exact item or batch, relevant settings and any photograph or measurement that another person would need to repeat the decision.

How do I confirm 8972541481 before ordering?

Yes, when the old pump is stamped 8972541481 or 8-94140341-0 on an Isuzu 4LE1. Hitachi ZX55, ZX55UR, E55 and EX55 machines that run that engine and number take this aluminium pump.

What is an immediate stop signal?

Treating a gasket as the only consumable. is one avoidable failure. Also stop whenever a wrong cooling-system part or poor installation can cause overheating and engine damage. Verify the engine plate, machine serial, old casting/part number and service information; installation and coolant handling should be performed by a competent person.

Isuzu 4LE1 Water Pump Replacement Planning Guide

If a compact excavator is coming off hire or sitting on a UK groundworks job with a hot 4LE1, plan the coolant pump swap before the machine is stripped. This page is for the WaterInpos aluminium pump supplied to OEM number 8972541481 — housing gasket and a smaller round seal in the box, original mounting bolts reused.

Match the stamp before you buy

ZX55, ZX55UR, E55 and EX55 machines that run an Isuzu 4LE1 take this pump when the old unit is stamped 8972541481 or 8-94140341-0. Read the engine plate and the number on the pump you are taking off.

What to have on the bench

Work on a cold engine with the battery disconnected. Drain the coolant into a container you can dispose of properly. You will need the drive belt and fan out of the way, a clean block face, the supplied housing gasket and round seal, and a torque wrench that can do 1.9–2.9 kg·m (14–21 lbf·ft) on the pump-to-block bolts.

Fit sequence that keeps you out of a second strip

Unbolt the old pump, clean the mating face, fit the new gaskets, and tighten to that torque band. Refit the belt, fan and hoses, fill with the coolant the machine maker specifies, bleed the system and check for leaks before you put the excavator back on the pile.

After it is running

Watch temperature on the first loaded hour and look at the weep hole. If you ordered the wrong number, stop and compare the old stamp with 8972541481 rather than forcing the housing.

See the Isuzu 4LE1 Water Pump 8972541481 for the aluminium housing, packing size and the gasket set in the box.