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Many thanks Roy.  That is really helpful.  I will let you know if I succeed ...

Many thanks

On 28/07/2021 at 18:19, Roy L S said:

I used a wired Zimo MX616 which is tiny at 8 x 8 x 2.4mm, cost £32 from Youchoos. I located the chip in the cab area above the motor. 

 

The whole model very cleverly clips together so easy to get apart, wiring is easy as the chassis is split, power comes from the chassis via little phosphor bronze strips that clip into recesses in the chassis each side. De-solder these from the motor wires and solder on power leads from the chip instead, shorten the wire attached to the motor and ditto motor leads from the chip, solder together and insulate with heat-shrink. 

 

The biggest challenge was routing the wires so that the chip located in the cab area, I found that some plastic from the top of the chassis assembly needs cutting away to facilitate this, but great care is needed as you will see that this holds the motor in place, cut too much away and the worm gear disengages (don't ask how I know this...).

 

All in all pretty easy, if I can do it anyone can!

 

Regards

 

Roy

Hi Roy

I'm having a go at installing a Zimo MX616 but am falling at the first hurdle.  I've managed to get the upper body shell off but cannot see how to unclip the chassis.  I'm reluctant to exert too much pressure so should be grateful for further guidance.

Many thanks

Steve