Descripción
Komatsu files this part under Hydraulics with the item name Motor, and the trade consistently attaches it to the cooling fan on the small and mid-size WA loaders. That is the honest position: the manufacturer names the component type, and the fan application comes from parts listings and dealer catalogues rather than from a Komatsu sentence that says fan.
Aplicabilidad
Listed for Komatsu WA100, WA150, WA150L, WA150PZ, WA200, WA200L, WA200PT, WA200PTL, WA250, WA250L, WA250PT, WA250PTL, WA250PZ and WA270. The PT and PZ suffixes identify piped and protected variants rather than different cooling circuits, which is why one motor covers the group. Komatsu publishes a width figure for the related 419-03-33242 rather than a displacement, and no displacement, pressure or flow rating is published for this number, so none is quoted here.
Why one motor covers six loader models
A fan motor is sized by the cooler pack and the fan hub, not by the engine badge. Across the WA100 to WA270 range Komatsu kept the cooling module geometry stable while changing engines and emissions packages, so the same motor serves the group. The practical consequence for a parts buyer is the opposite of what most people assume: the model name is weak evidence, and the number cast on your own housing is strong evidence. Two WA200s of different build years can still differ in what was fitted at the factory.
Diagnosing a loader fan motor
- Engine and hydraulic oil temperature rise during loading and fall back on the tram: airflow shortfall. Clean the cores first and re-test.
- Fan slow at every rpm: measure flow at the motor ports. Short flow is the supply pump, not this motor.
- Correct flow, lazy fan, hot case drain: internal wear. The energy is being spent heating oil instead of moving air.
- Oil at the hub: check the case drain line for a restriction before condemning the seal.
The tests are set out in our guía de diagnóstico de motores hidráulicos de ventilador, y coolant temperature sensor testing rules out the false signal that sends people buying the wrong part.
Montaje
Match shaft form, flange bolt pattern and port positions against the removed motor rather than against a photograph. Flush the circuit if the old unit produced debris and fit a new return filter element. Fill the casing with clean oil before the first crank. Keep the case drain unrestricted to tank. Target cleanliness around ISO 4406 18/16/13, the class Bosch Rexroth guidance gives for piston units in mobile service. Confirm rotation with the fan restrained, then prove full fan speed under thermal load.
Pedido
Send the number cast on your old motor and the machine serial number. Minimum order one piece, around 1,000 pieces a month available on this line. Bench checked, photographed against your order before the wooden case closes, delivery 5 to 8 working days from payment subject to stock, by sea, air or express courier. The WA320 motor is 419-03-33242, and the rest of the range sits under Motor de ventilador hidráulico Komatsu.
