Dual Current Drive Gearbox Heat issue
03-25-2022, 03:17 PM
#1
Dual Current Drive Gearbox Heat issue
Hey guys,
Been a long while since I've posted on here. Hope everyone is doing great. I recently changed my King Tiger to a TK6.1S. I purchased a Heng Long Dual Current Drive gearbox assembly from Forgebear tanks and installed it. Worked flawlessly. So today I actually had some time to take it for a proper test run and managed to drive it about 500 feet before it stopped moving. Sounded like a stripped gear. So I opened up the tank and the main drive motor was so hot I was worried. The motor mounting bolts had loosened and cause the drive belt to lose tension. My question is this: Is it normal for the main drive motor on these units to get so hot they burn you instantly? (I would think not) and will that heat transfer through the drive gear stretch the drive belt? I tested the chassis with the gearbox out and there is no resistence whatsoever. It will freewheel across the floor with the tracks on. I removed the tracks and made sure nothing was binding to cause drag on the motor as well. Thanks for any input!
PanzerAce
Been a long while since I've posted on here. Hope everyone is doing great. I recently changed my King Tiger to a TK6.1S. I purchased a Heng Long Dual Current Drive gearbox assembly from Forgebear tanks and installed it. Worked flawlessly. So today I actually had some time to take it for a proper test run and managed to drive it about 500 feet before it stopped moving. Sounded like a stripped gear. So I opened up the tank and the main drive motor was so hot I was worried. The motor mounting bolts had loosened and cause the drive belt to lose tension. My question is this: Is it normal for the main drive motor on these units to get so hot they burn you instantly? (I would think not) and will that heat transfer through the drive gear stretch the drive belt? I tested the chassis with the gearbox out and there is no resistence whatsoever. It will freewheel across the floor with the tracks on. I removed the tracks and made sure nothing was binding to cause drag on the motor as well. Thanks for any input!
PanzerAce
03-25-2022, 05:09 PM
#2
Hey guys,
Been a long while since I've posted on here. Hope everyone is doing great. I recently changed my King Tiger to a TK6.1S. I purchased a Heng Long Dual Current Drive gearbox assembly from Forgebear tanks and installed it. Worked flawlessly. So today I actually had some time to take it for a proper test run and managed to drive it about 500 feet before it stopped moving. Sounded like a stripped gear. So I opened up the tank and the main drive motor was so hot I was worried. The motor mounting bolts had loosened and cause the drive belt to lose tension. My question is this: Is it normal for the main drive motor on these units to get so hot they burn you instantly? (I would think not) and will that heat transfer through the drive gear stretch the drive belt? I tested the chassis with the gearbox out and there is no resistence whatsoever. It will freewheel across the floor with the tracks on. I removed the tracks and made sure nothing was binding to cause drag on the motor as well. Thanks for any input!
PanzerAce
Been a long while since I've posted on here. Hope everyone is doing great. I recently changed my King Tiger to a TK6.1S. I purchased a Heng Long Dual Current Drive gearbox assembly from Forgebear tanks and installed it. Worked flawlessly. So today I actually had some time to take it for a proper test run and managed to drive it about 500 feet before it stopped moving. Sounded like a stripped gear. So I opened up the tank and the main drive motor was so hot I was worried. The motor mounting bolts had loosened and cause the drive belt to lose tension. My question is this: Is it normal for the main drive motor on these units to get so hot they burn you instantly? (I would think not) and will that heat transfer through the drive gear stretch the drive belt? I tested the chassis with the gearbox out and there is no resistence whatsoever. It will freewheel across the floor with the tracks on. I removed the tracks and made sure nothing was binding to cause drag on the motor as well. Thanks for any input!
PanzerAce
03-26-2022, 11:59 AM
#4
Ive never used the hl version but I’ve a lot of the original pdsgb. I’ve never had that level of heat, even in heavy tanks on 3s power.
however a friend did have a HengLong one where the motor burnt out very quickly. Could be a dodgy motor? Or the belts been setup too tight so it’s screaming?
however a friend did have a HengLong one where the motor burnt out very quickly. Could be a dodgy motor? Or the belts been setup too tight so it’s screaming?
03-26-2022, 12:09 PM
#5
The belt losing tension which caused it to stop moving was the only reason I even opened it. It was making no noise (whining, squealing, screaming) of any kind). I was actually extremely impressed at how quiet it was operating. My Leopard2A6 is heavier than this King Tiger and it also has the same style gearbox but it doesnt get nearly as hot with 10x the run distance and the same TK6.1S control board. I put in a 3s 5200 mAh 11.1v LiPo earlier (hindsight is 20/20 and this was stupid) and it partially melted the motor under barely any throttle in less than 50 feet. I really am at a loss a this point.
04-05-2022, 11:07 AM
#7
Really need to see the motor data sheets of the motors you are using and the ones you replaced to get a good idea whats going on.
But the thought comes to mind:
Higher power motors will generally have lower impedance, which would draw more current, and if the voltage is not stiff enough, will draw more current as heating as inefficency increases the motor lags and draws more current to catch up thus causing even more heating
But the thought comes to mind:
Higher power motors will generally have lower impedance, which would draw more current, and if the voltage is not stiff enough, will draw more current as heating as inefficency increases the motor lags and draws more current to catch up thus causing even more heating
