Re: Broken Heng Long Tiger

[oldgeezer]

Hey everyone out there. I'm new to this forum and the world of R/C Tanks but this site was recommended by a member who thinks someone out there may be able to help with a problem I have with my Heng Long Tiger 1.
The left hand track doesn't move forward or reverse but all other functions on the Tank work. I have taken the following steps.
Removed the top
Checked the Gearbox is connected to the Motor
Checked the Gears move and are greased
Removed the securing screw from the Drive wheel and have taken off the outer half of the wheel
This is where the problems start
The Inner part of the drive wheel (?) is jammed on / stuck and I dont know if there is anything holding it in place or I just need to give it some oomph to get it off the main spindal
The gears move freely , the spindal moves but the drive wheel stays still with the spindal moving inside.
Anyone any ideas how to fix this ?
Like I said I'm new to this and I only brought this Tank for my Son (thats my excuse anyway). I have no knowledge whatsoever how to work on this Tank and feel out of my depth. I would have preferred someone with better skills than me to have a look but I couldn't find anyone unless there is someone out there near Heathrow Airport who fancies having a look. Failing that any advise would be great

[Saxondog]

The output shaft of the gearbox has a flat side,the inner drive sprocket slides on the shaft when the flat spot alignes with the flat side of the shaft,then their are two alignment pegs on the outer drive sprocket half that align with the holes on the inner sprocket half.Then the screw retaines the the outer half to the inner half and the shaft.Now the inner sprocket half slides on the shaft,in you case it seems the inner half is either forced on and not in alignment or is manufactured wrong and does not have the flat spot.It should slide off with a little help,use flat blade screw drivers a lever and pry the sprocket off,be careful and rotate the sprocket half as you pry,working the sprocket half off a little at a time.The problem must be the sprocket half,if the shaft were round it would not fit into the sprocket.PM me if you have trouble,Blake aka Saxondog

[oldgeezer]

Thanks for that Saxondog - I'll have a crack at it when I finish work and let you know what happens.
Do you have any thoughts on why I cant get the left track to run based on the description I have given or is it possibly as you said that the inner drive wheel is not sitting on the shaft correctly. If this is the case how would I fix it

[oldgeezer]

Now we're getting into something I really have no clue about. I can just about keep up with drive wheels , shafts and gears but circuit boards and chips go way over my head. Are these items easily changed or do I need a PhD ? Where would be the best place to buy spares from in the UK - E Bay ?

[Ex_Pat_Tanker]

does the motor on that side actually turn and its the sproket thats jammed, or does nothing turn unless you move it by hand? - I read you post and the re-read it and couldn't make my mind up???

circuit boards are easily changed, forgebear, mlitarymight and welshdragon are 3 UK vendors who are members on this board and usually have the parts to hand. If you have a newer tank then the control board is a plug in affair.

[oldgeezer]

Will re connect power and run up with top off to see if motor / gearbox / shaft turn as not sure. This is the prob with not being up on these things - you tend to work backwards rather than logicaly. I'll have a go when I get home (at work and probably going to get into trouble for using works PC).
I know Militarymight as I purchased this Tank from him - very helpful so a good place to go for spares.
Will have a go and let you know the outcome. Fingers crossed that its the drive wheel not on the shaft thats the problem rather than anything else

[tribalmasters]

My brand new Tiger after 3 days of running suddenly broke, turned out the sprocket had completely come off!!  After a few tips on here about removing the hub cap to get at the screw with a flat screwdriver she was running around the garden once again!  Hope your problem is something as easy to fix

[wibblywobbly]

Before you take the drive sprocket off, check that the motor is running, otherwise you will have wasted your time taking the sprocket off. It is highly unlikely that the shaft is turning and slipping inside of the sprocket.

If the motor is not running, check that both wires are soldered onto it.
If both wires are connected then trace them back to the main board.
Check that both wires are attached to the main board.
If both wires are attached to the main board then in all probability the components on the board that feed power to that motor have blown.
If this is the case, then you will need a new board.

You have two alternatives.

Replace the board with what is already there, probably an RX14.
Replace the board with the latest version. The RX18.

There are loads of 'how-to's' on here to complete either task, and a board will only cost around £20-£25.
Once you have fitted the new board, take a look at the advice re fitting fuses to protect the circuits, as this will help avoid a recurrence of the problem.

Hope this helps

Rob G

[tribalmasters]

Also check the trims on the controller although it will probably be nothing to do with the controller as I just checked spinning turns one track forward and one backward so easy to see when one side is not running.

[oldgeezer]

Thanks to everyone for the helpful ideas. I'll try out some of the suggestions and will post the results when completed.
I have found that if I turn the gearbox then the drive wheel moves but if I turn the wheel then it 'slips' on the shaft. Just charging up the battery and then I'll give it another go re motors etc.