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This one has me stumped

Old 02-12-2021, 07:31 PM
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XchosenlegacyX
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Default This one has me stumped

Ok this has me stumped- I bought a new Henglong 2.4ghz Stug 3 Ausf. G and now I have a transmitter problem. It has the gold stickered HL mfu in it. I took it apart to paint, I installed Taigen steel gearboxes, put back together and now forward throttle is right stick pushed left(not forward) and full reverse is right stick pushed right( not down). Up is right turn and down is left turn. How could the “channels” switch like that?? It makes it almost impossible to drive the tank? It worked perfect before I took it apart, all connections can only be made one way to mfu unit! I’m really confused by this, please help!!
Old 02-12-2021, 08:02 PM
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tankme
 
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It could be that the motor leads are not wired the same from the old motors to the new ones. You can experiment with connecting the red to black and black to red ON THE MOTORS. All it will do is reverse the motor direction. It will not harm the motors. Each motor has a positive side and a negative side, but on a neutrally timed motor it doesn't matter which is which. It works equally well either way. The new motors could have the positive (red) wire soldered to the negative terminal on the motor. It's a pretty common issue when putting in new motors or gearboxes. If your tank doesn't have quick disconnect connectors between the motors and the multifunction unit, you can reverse the connections by removing the wires from the white square JST connector.





Don't reverse the power wires to the battery. You will let the magic smoke out if you do this and it's really hard to put the smoke back in once you've let it out.

Last edited by tankme; 02-12-2021 at 08:07 PM.
Old 02-12-2021, 08:12 PM
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XchosenlegacyX
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Yeah I matched up old to new gearboxes, wires were the same, but your right, could be connected to different poles, let me give that a try


update- that was it!! - thank you so much tankme!!!! easy fix

Last edited by XchosenlegacyX; 02-12-2021 at 08:19 PM.
Old 02-15-2021, 09:29 AM
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Imex-Erik
 
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This happens when you plug the motors in backwards. Left and right turn correctly but forward and reverse are swapped. Just swap the motor plugs. Don't swap motor polarity on the plugs, it is much faster and easier to just correctly plug them in
Old 02-15-2021, 03:31 PM
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XchosenlegacyX
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Thanks Erik,
that’s what I did, now if I can just find some way to slow the tank down, even with the Taigen 3:1 gearboxes I still feel like the model is WAY too fast. I may need to see if I can find some dc gear motors to hook up to it
Old 02-15-2021, 06:13 PM
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Could change your pinion gear off the motor to a smaller tooth gear. You may also have to "window" one of the motor mount holes to get the motor/gear to mesh with the first gear.
You'll need a pinion puller to get the stock pinion off. Something like this.
Amazon Amazon

Last edited by TheBennyB; 02-15-2021 at 06:16 PM.
Old 02-15-2021, 07:00 PM
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XchosenlegacyX
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Do you happen to know the gear pitch for this pinion?
Old 02-15-2021, 08:39 PM
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XchosenlegacyX
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Also having trouble finding any pinions any smaller, it already has a 10 tooth pinion, can’t find one any smaller than that
Old 02-16-2021, 10:52 AM
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48 pitch for our gearboxes. The old brass gearboxes were a slight bit different but the steel ones are 48p.
Old 02-16-2021, 04:46 PM
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RLJohns
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I am having a somewhat similar issue. Installed the HL U2 gearbox in my HL Tiger 1, the tank goes fwd./rev. just fine however L/R are backwards. Not sure whether the left motor (US Drivers Side) is M1 or M2.
Old 02-17-2021, 06:40 AM
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As mentioned above, what worked for me what finding the gearbox that works properly( right goes forward with forward tx gimble push and stops with right turn or vice versa) then whatever gearbox is not operating properly, follow the above steps, to switch leads, dc motors run both ways, so doesn’t matter if leads are in plug backwards, in my case, I just needed to switch the left gearboxs’ pos and neg pin In the plug and that did it for me
Old 02-19-2021, 01:43 PM
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RLJohns
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The HL U2 gearbox/motors had the plug type connectors while the HL 6.0 MFU had bullet connectors. For now I cut the plug type connectors off and soldered on the bullet cons. Would switching the negative wires, from M1 to M2 solve the issue since the reverse current to the motors would from M1 to M2?
Old 02-19-2021, 03:45 PM
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tankme
 
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Originally Posted by RLJohns View Post
The HL U2 gearbox/motors had the plug type connectors while the HL 6.0 MFU had bullet connectors. For now I cut the plug type connectors off and soldered on the bullet cons. Would switching the negative wires, from M1 to M2 solve the issue since the reverse current to the motors would from M1 to M2?
I'm not even sure what you are asking at this point. Each pair (with positive and negative) must go to the same motor. M1 red/black must go to the multifunction port for M1. M2 red/black must go to the multifunction port for M2.
Old 02-19-2021, 05:21 PM
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That is the way I have things hooked up as you described however, as I mentioned in an earlier post on this thread, instead of turning left with left stick input my Tiger 1 goes right and vise-versa.

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