Heng Long Challenger 2.Metal Tracks and Sprokets etc.

[Pavel]

I have such gearboxes... I installed them in the place where I thought it was necessary, made my own mounting points, for installation accuracy, used a shaft with a diameter of 8 mm, so I got precise alignment.

[zooma]

"A forward (positively) timed DC motor runs faster in the forward...." That's interesting, tankme! I will keep that in mind.

You see, zooma, there's always someone who can learn from your, unh, exploits.

I also wonder how you kept all the little gears from saying "bye-bye" and scrambling off to Neverland when you had the motor mounts separated. I have tried opening various sorts of gearboxes and inevitably end up with an intriguing puzzle.

Hi Prof,

I took a picture with my iPhone before taking the gearbox side off so I could see where all the gears fitted if they should fall out.

As I only needed to remove the side that had the mounting base on it (to elongate the holes) I hardly disturbed the gear "nest" in any case so it was easy to slide the gearbox side that I have been working on back into position and then repeat the process for the second gearbox.

No puzzles to solve!

Swapping the motor leads over is easy (no servo reverse function on the 7.0 tx). I didn't know that some of the RED motors came wired incorrectly ........or that I may have to connect them to the opposite output wires on the board (M1-M2) to make them run in the correct direction for turning!

Every day is a learning day!

Stay safe - Bob.

[zooma]

I have such gearboxes... I installed them in the place where I thought it was necessary, made my own mounting points, for installation accuracy, used a shaft with a diameter of 8 mm, so I got precise alignment.

I didn't know that there was any need to make new mounting positions when installing any Heng Long Gearbox into a Heng Long tank (assuming it was the correct type of gearbox for the model it is being fitted into).

Using the longer RED motors need's a little 'adjustment" to stop the lower motor shorting-out against the gearbox side it is touching, but the blue motors than come with the Ultimate Edition 11 gearbox are shorter and should be a straight "drop-in" fit?

[zooma]

I want to find one of these to fit my Challenger 2.

891FE932-BF80-497A-8BEB-02925F2F2335.jpeg (1.53 MiB) Viewed 864 times

Does anyone know where I can buy one of these to fit a Challenger 2 ?

Apart from liking the red colour (!), I like the hardened alloy gearbox frame and the bearings, but I would want to remove the shorter BLUE motors and replace them with the longer RED motors so - I would still need to modify the mountings slightly to prevent the risk of the lower motor shorting against the opposing gearbox frame.

[Pavel]

They sell (expensive) a block there are no problems with installation.....
It was specifically developed for Challenger 2
All videos are about this.
https://www.rctank.de/Challenger-PDSGB- ... -Heng-Long

[zooma]

Everything worked OK and the motors run OK so everything seems to be OK.....I just need to work out how to reverse the throttle as the motors appear to be running backwards when forward throttle is selected. (Heng Long 7.0).

There is now way to reverse the motors using the controller or MFU. You need to reverse the motor leads connected to the MFU. That's the only way to reverse the direction of the motors. It won't hurt anything. They can be run in either direction. Some of the red motors have the terminals wired backwards from the motor you are replacing. After reversing the motor, you may find that you need to swap the motors from M1 to M2 and M2 to M1 while also reversing the connection of the other motor. That may lead to red wires and black wires being paired together, but that is OK for the motors. Just don't do that on anything else except the rotation motor. DC motors don't care which side is wired positive or negative - UNLESS the motors are timed more forward or more reverse. The motors we use in these tanks should be neutrally timed.

A forward (positively) timed DC motor runs faster in the forward direction than the reverse direction. A reverse (negatively) timed DC motor runs faster in reverse than in the forward direction. A neutrally timed DC motor runs the same speed in forward or reverse.

Throw all that timing talk out the window for brushless motors...as they work differently than DC (direct current or brushed) motors.

If you find that your motors are wired red to black, I would definitely label them for future maintenance to save you the hassle of having to go through this whole process again.

.

Thanks Derek,

I had no idea that some of these RED motors come with the wires fitted in reverse. I will change the labelling on my ECB leads to align with the incorrect wire colouring and the correct outputs from the board............as I may forget later when I come to service the tank or make any repairs etc!

Bob.

[zooma]

They sell (expensive) a block there are no problems with installation.....
It was specifically developed for Challenger 2
All videos are about this.
https://www.rctank.de/Challenger-PDSGB- ... -Heng-Long

That looks interesting Pavel - I wonder how the power output of the 480 motors that they use in this gearbox compare with the RED motors that I am using now?

[Pavel]

I installed this device for a friend, he says he likes it... Google YouTube, there is a video of a tank flying with this installation, I have a problem, I can't send you a link, there is also a video on the seller's website...

[zooma]

I installed this device for a friend, he says he likes it... Google YouTube, there is a video of a tank flying with this installation, I have a problem, I can't send you a link, there is also a video on the seller's website...

Thanks Pavel - I will take a look.

[zooma]

There is now way to reverse the motors using the controller or MFU. You need to reverse the motor leads connected to the MFU. That's the only way to reverse the direction of the motors. It won't hurt anything. They can be run in either direction. Some of the red motors have the terminals wired backwards from the motor you are replacing. After reversing the motor, you may find that you need to swap the motors from M1 to M2 and M2 to M1 while also reversing the connection of the other motor. That may lead to red wires and black wires being paired together, but that is OK for the motors. Just don't do that on anything else except the rotation motor. DC motors don't care which side is wired positive or negative - UNLESS the motors are timed more forward or more reverse. The motors we use in these tanks should be neutrally timed.

A forward (positively) timed DC motor runs faster in the forward direction than the reverse direction. A reverse (negatively) timed DC motor runs faster in reverse than in the forward direction. A neutrally timed DC motor runs the same speed in forward or reverse.

Throw all that timing talk out the window for brushless motors...as they work differently than DC (direct current or brushed) motors.

If you find that your motors are wired red to black, I would definitely label them for future maintenance to save you the hassle of having to go through this whole process again.
[/quote]

Hi tankme,

First I changed the red and black motor wires with each other - and I also moved them over to the opposite output leads M1 to M2...and the motors still run backwards!

I kept the wires to the MFU in the same position that I had just changed them over to, but reverted the motor wires back to red/red and black/'black and the tank then drove in the correct direction and the steering also worked correctly too!

So there was no need to change the polarity of the motor wires on this occasion - just swopping them over to the opposite pair of MFU leads did the job!

Many thanks to you and Meter rat (who also gave the same advice !).

Bob.