My Truck Doesn't Move

[misamae]

I've just installed the MFC-01 unit on my scania r470. But when I move the left stick on the remote, I hear some noise but the truck doesn't move. Any advice?

Thanks, Mesiam.

[turbine2]

I've just installed the MFC-01 unit on my scania r470. But when I move the left stick on the remote, I hear some noise but the truck doesn't move. Any advice?

Thanks, Mesiam.

I'm in a simalar position at the moment as well, although I've managed to track it down to the gearbox. I've low and high but no mid, so I'm going to have to take it apart and try to work out where I've gone wrong.

[misamae]

I'm in a simalar position at the moment as well, although I've managed to track it down to the gearbox. I've low and high but no mid, so I'm going to have to take it apart and try to work out where I've gone wrong.

that seems to be a lot of work at this stage. Do you know if there is any other way around it?

[retroman]

I would suggest "trial and error" time guys

Disconnect the gear shift servo, then, using the clips supplied for locking the gearbox in one gear using a 2 channel radio, lock it in first, then second, then third, and see if all gears work by turning the gearbox over with the rear wheels. If they won't all engage, there's a gearbox problem. If they do engage, shift servo adjustments are wrong. The gearbox part of the build on my King Hauler was the one part I wasn't overly impressed with, as the diagrams were a little confusing.

As far as the truck won't move; I would check and read the MFU instruction book very carefully. One of the functions is "engine revving" so the truck won't move, but the rev's increase through the speaker. Another possibility; What Transmitter/ radio gear are you using?? I am using the Futaba T4EXA, and the stick modes were wrong, so that the right stick when moved forwards or backwards made the truck move! It was a simple fix, by going into the "Mode" programming in the transmitter, and changing it. Failing all that..... Double check your wiring, if that doesn't work, unplug the motor wires, and plug in another motor, just to see if a different motor works. If it does, maybe a dead motor, or the gearbox is jammed in 2 gears at once??

Hope this helps guy's, it's about all I can think of, off the top of my head

[misamae]

I would suggest "trial and error" time guys

Disconnect the gear shift servo, then, using the clips supplied for locking the gearbox in one gear using a 2 channel radio, lock it in first, then second, then third, and see if all gears work by turning the gearbox over with the rear wheels. If they won't all engage, there's a gearbox problem. If they do engage, shift servo adjustments are wrong. The gearbox part of the build on my King Hauler was the one part I wasn't overly impressed with, as the diagrams were a little confusing.

As far as the truck won't move; I would check and read the MFU instruction book very carefully. One of the functions is "engine revving" so the truck won't move, but the rev's increase through the speaker. Another possibility; What Transmitter/ radio gear are you using?? I am using the Futaba T4EXA, and the stick modes were wrong, so that the right stick when moved forwards or backwards made the truck move! It was a simple fix, by going into the "Mode" programming in the transmitter, and changing it. Failing all that..... Double check your wiring, if that doesn't work, unplug the motor wires, and plug in another motor, just to see if a different motor works. If it does, maybe a dead motor, or the gearbox is jammed in 2 gears at once??

Hope this helps guy's, it's about all I can think of, off the top of my head

Thanks a lot for your comprehensive advice. Your initial suggestion was right. The problem was in the gearbox. I installed the gear attached to the motor in the wrong way. Now I'm reassemblying the box.

Thanks mate.

[retroman]

Easily done It's always worth trying the simple stuff first. Glad to hear that you have got it sorted

[Origineelreclamebord]

So you can hear the motor turning? I'd check if you tightened the pinion enough. It might have been too loose or have become loose, it happened to me a few times since I got my first car (a few years ago).

[turbine2]

Thanks a lot for your comprehensive advice. Your initial suggestion was right. The problem was in the gearbox. I installed the gear attached to the motor in the wrong way. Now I'm reassemblying the box.

Thanks mate.

Mine too, I'd managed to confuse two of the selectors on the shaft. Another problem I had earlier (but managed to spot in time) was that I'd put one of the rear diff/wheel sets in upside down so when the drive shaft was turned one set went backwards and the other forwards, which could have been 'interesting'.

Other than that, the only issue I have is the motor just presses a little too much against one of the servos at the moment, but I may be able to get a bit of a spacer on the servo I think.