Controller assembly Komatsu 21W-06-21712, aftermarket

21W-06-21712

Article
21W-06-21712
Machine system
Electrics
Part type
Controller
Manufacturing type
Aftermarket
All the features

In stock

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For the Komatsu excavators: controller assembly Komatsu 21W-06-21712, an aftermarket part. According to the product card, this is a complete controller for a Komatsu machine.

According to sources, 728/M4799 is the PC4 AUX ECU used on JCB 3CX and 4CX backhoe loaders, and some sources also give the numbers 728/H7755, 728/31500 and 728/29400 for the same group of units. The unit sits inside the cab where it is protected from moisture and vibration. Water getting into the cab, for example rain leaking past a window seal, can corrode the unit and its connectors, so check the cab's sealing when replacing the unit. Confirm with the serial number when ordering that the new unit suits the machine's software version.

Specifications

Part number	21W-06-21712
Production type	Aftermarket
Part type	Controller
System / group	Electrics

Compatibility

According to the product card, 21W-06-21712 is a controller. Fit is confirmed by the part number. Other parts are in Komatsu cab parts.

Fitting

Before replacing the control unit, switch off the ignition and disconnect the battery negative, then unplug the connectors by pressing their latches. After fitting the new unit, if the machine's software and settings require it, program or configure the unit with the JCB diagnostic tool (ServiceMaster). Push the connectors fully home without bending any pins and test every function. The part comes new; before fitting, compare its part number and connection type with the old part. After the change, check the function and the warnings on the instrument panel.