New StuG III misbehaving!

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Athelstan
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New StuG III misbehaving!

Post by Athelstan »

Hey all,

Having excitedly taken delivery of my first model tank I got everything charged and set up. I was impressed by the heft and overall look of the model and took a few photos while the battery charged. I didn't really have any idea what to expect when I turned it on for the first time as I have not seen one of these models first-hand before but from a layman's point of view everything started off fine.

The sound started up, as did the smoke unit. I didn't expect the latter to be quite so noisy but the wisps of smoke wafting out of the rear of the tank were nice to see.

The tank took off across the grass (I didn't expect the gearbox to be quite so noisy, either. It's the metal one so presumably a good bit of lubrication might help) and everything looked to be functioning until a minute or so in when the model stopped responding. The sound module was still making a noise but there was no response from any of the controls.

Turning the tank off and back on again resolved the problem but it again cut off after about a minute, This was repeated a third time, after which I stopped trying to get it run and came here to ask for advice - for fear of damaging the thing.

The "customer" in me thinks; "Perhaps I ought to arrange for a replacement" but the former avid RC-car owner in me wants to get inside the hull and check things out. From a completely layman point of view it sounds to me rather like a wire on the RX18 is loose but of course I don't actually know. It could be something like a faulty RX18, an over-tightened gearbox assembly or even a rogue moose for all I know...

Could someone shed some light on what they think the problem might be? Is there a sufficiently small risk of damaging the tank by taking it apart that it is worth getting inside it to look for loose wiring instead of thinking about a replacement?

I'd obviously like to get the tank working properly but I don't want to risk making things worse by barging in to things blindly :thumbdown:

Thanks in advance,
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Woz
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Re: New StuG III misbehaving!

Post by Woz »

I had this problem in my T-34, check to see if crystals are in properly (it may be a good idea to take them out and pull the legs apart slightly) and make sure all the batteries are fully charged.

I
STEINER
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Re: New StuG III misbehaving!

Post by STEINER »

Hello,
It could be any one of a number of things that could be the problem. If you have a guarantee, then by opening the tank up you will probably invalid the guarantee. Yes you could send it back and get a replacement, but I can bet you sooner or later another problem will develop. Welcome to the wonderful world of Heng long, where the only guaranteed reliable thing about these tanks are their Unreliability. With regard to the gearboxes, it is beneficial if you can break them in.
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Panzermensch
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Re: New StuG III misbehaving!

Post by Panzermensch »

Have you recharged the battery? My Tiger behaves like this when the battery is running down.
Athelstan
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Re: New StuG III misbehaving!

Post by Athelstan »

STEINER wrote:Hello,
It could be any one of a number of things that could be the problem. If you have a guarantee, then by opening the tank up you will probably invalid the guarantee. Yes you could send it back and get a replacement, but I can bet you sooner or later another problem will develop. Welcome to the wonderful world of Heng long, where the only guaranteed reliable thing about these tanks are their Unreliability. With regard to the gearboxes, it is beneficial if you can break them in.
At the risk of sounding completely pessimistic I was expecting to have some sort of quirk or problem before everything was working 100%; fingers crossed this'll be something simple as I'd really rather avoid having to send it back - it's just hassle as much as anything!

I've reseated the crystals but that didn't make a difference, thanks for the suggestion though Woz.

I decided to have another look after dinner and now it only runs for a handful of seconds before cutting out but if you pick the tank up and give it a little shake side-to-side it'll start working again, albeit only for a few seconds. To me that hints quite strongly toward there being a loose connection of some kind but perhaps I'm just being ignorant!

Before purchasing the tank I came across a guide to dismantling the two halves (complete with photos). I reckon if I look for that again I can decide whether or not I want to take the plunge and see if I can uncover the problem; I'll have a better idea of what to look for if I have a photo of the innards at hand.

Panzermensch, I have checked the battery. Having said that I did only use the bog-standard charger and battery. My brother has my old "proper" charger; perhaps I ought to see if I can get that back off of him to test whether maybe the charger simply isn't doing its job very well... Sadly the only other battery pack I have here is an 8.4v one. Not only would that not fit in the tank I can't imagine that it'd do the model much good either!
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Woz
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Re: New StuG III misbehaving!

Post by Woz »

Get in touch with the seller and ask them if it's OK to open it up (tell them you have experience with RC stuff).

Also check the wires in your transmitter.

Are you using rechargable batteries in the transmitter?

If you are then you need to remove the little sliding tabs that are in the battery compartment. The rasied connector on the +ve end of the battery doesnt stick out as much on some rechargabe batteries as it does on normal batteries. Even though the transmitter is on and working it's not running at full power because the batteries aren't making contact with each other properly.
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forgebear
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Re: New StuG III misbehaving!

Post by forgebear »

hi it sounds like the range on the receiver board thats the small board in the tank that the crystal plugs in to when the tank gets out of range it wont talk to the transmitter until you get the tank back close then you restart and its ok till it goes out of range again my thought
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Tankbear
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Re: New StuG III misbehaving!

Post by Tankbear »

Hi Athelstan,

I've had mt tank just over two weeks now and does simular although not as bad for some reason it just stop responding yet makes a noise. And pushing the key to put into standby then again brings it back to life.

Mine appears to do it when the smoke is switched on and i'm driving up hill on the grass i.e. stressing the battery and speed controller. As yours has the metal gearbox maybe there are tight and need running in maybe try putting upside down and running it for 10 minutes or so.
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971wright
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Re: New StuG III misbehaving!

Post by 971wright »

Hi It could be your ariel wire isnt conecting correctly,or a duff battery.

regards pete
Athelstan
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Re: New StuG III misbehaving!

Post by Athelstan »

I really appreciate all this input, thank you very much.

I'm using rechargeable batteries but from what I can see they are all making contact well. I'll try to remove the sliders tomorrow to make sure.

However... The range doesn't seem to be the problem. The post-dinner tests were actually in the house and I was no more than six feet from the tank when it cut out.

I'll try running the gearbox tomorrow and see if that makes a difference, thanks Tankbear. I took your advice Woz and emailed the retailer, explaining the problem and basically asking if they minded me opening the model up; there's nothing really to lose regardless of their reply!

My memory is extremely poor; I've had no luck finding the photos of the StuG being taken apart and I'm starting to wonder if I've just gotten confused at some point and mistaken some other pictures for what I was thinking about. Assuming the retailer doesn't mind me doing it could someone please summarise how you take the halves apart, or link a couple of pictures?

Sorry for being such a nub :)

And Forgebear, do you sell 2000mah+ capacity 7.2v nimh batteries?

Thanks
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