Technic 9398 has no torque

[Desno_HD]

Hello i have a question, my 9893 is very short on torque.

It can barely drive over one of my feet. I tried changing from rechargeable batteries to normal ones but it has no effect.

Please Help me.

Thanks in advance.

[1gor]

Perhaps you have some problem made during assembly? Did you check if everything is build according instructions?

Perhaps some images from below would be useful?

(For images try bricksafe or Flickr hosting and paste link for images not bigger than 1024p here)

Edited April 16, 2020 by I_Igor

[brickless_kiwi]

1 hour ago, Desno_HD said:

Hello i have a question, my 9893 is very short on torque.

It can barely drive over one of my feet. I tried changing from rechargeable batteries to normal ones but it has no effect.

Please Help me.

Thanks in advance.

take a photo of the underside and post it..

[1gor]

Just now, brickless_kiwi said:

take a photo of the underside and post it..

I think he can not yet as a new member...

[agrof]

He can link photos.... but @Desno_HD how big is your foot? 

[Desno_HD]

On 4/16/2020 at 1:13 PM, I_Igor said:

Perhaps you have some problem made during assembly? Did you check if everything is build according instructions?

Perhaps some images from below would be useful?

(For images try bricksafe or Flickr hosting and paste link for images not bigger than 1024p here)

https://bricksafe.com/pages/Desno_HD/desnos-picks

here you go ;)

[1gor]

43 minutes ago, Desno_HD said:

https://bricksafe.com/pages/Desno_HD/desnos-picks

here you go ;)

Usually people put differential in wrong "direction", but your us fine. Was is the same problem from first day? Sometimes (but very rare) is problem with motors, but how it behaves on even floor e.g in your room without obstacles?

But I have never tried it with Claas tires, perhaps are they rubbing somewhere. Does it work with 94.8 balloon tires and Unimog tires?

Edited April 17, 2020 by I_Igor

[jshuiting]

I'm guessing the extra height of the claas tires is decreasing torque,or at least makes it allot more difficult for the car to lift itself.
Even the 42070 can be made much more agile by fitting some smaller tires.

[1gor]

Just now, jshuiting said:

I'm guessing the extra height of the claas tires is decreasing torque,or at least makes it allot more difficult for the car to lift itself.
Even the 42070 can be made much more agile by fitting some smaller tires.

I have noticed that on my MOC, I need 2 XL motors to have sufficient pull power; one XL motor is better than 2L motors, but not enough.

[technicbuilder]

If you change the gears in the wheel hub ,you get also more torque .

10 tooth and 24 tooth 

[zux]

13 minutes ago, jshuiting said:

I'm guessing the extra height of the claas tires is decreasing torque,or at least makes it allot more difficult for the car to lift itself.

I had some 3rd party RC tyres on my 9398, which are same size as Claas, but have more grip than LEGO ones. Didn't observe the issue reported by OP, so there must be something else.

To me it looks like batteries don't have the juice, however this has been eliminated. Another concern could be friction, but can't seem to remember if there were places that could cause this.

@Desno_HD has your model been working fine at some point? And if yes, has anything happened between then and now - maybe you've kept the set it storage for some time, or it was freshly rebuilt, anything else?

[Desno_HD]

my model is used, i bought it off ebay and has never been working fine.

I used to own one back when it was released in 2012 and that one was an absolute beast even without mod's.

Back then i thought the problem was that the motors where bad so i bought new ones, that didn't help so i replaced the IR reciever and the battery box.

That did not fix the problem.

Changing the tires gave it back a lite Torque but not as much as it used to have.

[doug72]

I would suggest strip it down to individual parts and try re-building it.

[1gor]

Perhaps you could try without motor to see friction, if it "works" smoothly by pushing, then one or both l-motors could cause problem ...

[Zerobricks]

My suggestion. Take it apart, wash the parts and put it back together.

[Desno_HD]

Taking it apart and rebuilding it sounds like the best idea.

Maybe i will wash the parts, i will see that when i have taken them apart.

[Desno_HD]

I rebuild both of the axles and it had no effect whatsoever so I will now resort to driving it with my buwizz.

Thanks for all the help.

[schraubedrin]

Is there a difference in torque between the axles?
That would mean one of the motors has a problem.

Is there a difference in torque when you use the other ports on the IR receivers? (switch the servo with the motors)
That would mean an electrical problem, e.g. corroded contacts.

[amorti]

It should have the V2 infrared receivers. These send more power. Maybe somebody has put the lesser version in, and sold the set along?