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Old 09-08-2005, 02:29 AM   #1
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Default TA04 alignment problem

Since I haven't seen a ta04 thread before, I decided to put one up. But I have a problem with my ta04-trf. I have not seen a lot of people with this car, but I need some help with this problem, I am hoping to find someone here.

For those who are unfamiliar with the ta04, take a look at the following pic:
http://www.tamiya.com/english/produc...rf/04trf_4.htm

In the picture, you should observe a blue aluminum heat sink, the spur gear and the pinion gear. Attached to the spur gear is the drive shaft (which drives the front and rear belts) and attached to the pinion gear is the motor shaft. The motor is bolted onto the heat sink using 2x screws.

For anyone with a ta04-pro, ta04-r, ta04-s, that should be obvious.

Now, it is my intution that the drive shaft and the motor shaft should run parallel to each other inorder for power to be transferred efficently.

However, when I mount the motor to the heat sink by tightening the 2 screws, I find that the motor shaft is not parallel to the drive shaft. Its off by some abitrary angle. Although the pinion gear can be properly meshed with the spur gear, uneven wearing of the pinion and spur gears is severe.

This worries me also because endbell temperatures for me is hitting 70+ degrees celcius on a regular basis. I am beginning to think this misalignment factor is causing my motor to work excessively. I assure anyone who is reading the thread that I have tried many gearing combinations from 5.1:1 to 7.1:1 and the problem still exists. I run a 19T orion v2 motor.

I have tried to add shims to try and "pivot" the motor and help align the motor shaft to the drive shaft properly. But this has proved ineffective. Also, I reckon that if I shim excessively, the heatsink is rendered useless because it is not in direct contact with the motor.

I hope someone who has a ta04 and knows wtf i am talking about (i know i am not very good at expressing myself, but I don't have a camera and can't take any photos!) to help me out with this problem.

Is there anyone with a ta04 that has experienced a similar problem or know of a solution?


Thanks in advance!

Patrick.
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Old 09-08-2005, 03:11 AM   #2
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I'd say, check that your motor mount is flat by taking it off and putting it on a flat surface. If it's flat, then there's a problem with your rear bulkheads, change em... However, 70C on a 19t V2 ain't that much, everyone who runs them will tell you they get freakin' hot.
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Old 09-08-2005, 03:19 AM   #3
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Hi Patrick I have a TA-04R and I had to go and check this for myself and lucky for me mine are in line. I don't know why your motor shaft would be out of line and it's hard to tell with no pictures (not your fault I know) maybe take it to your LHS and see if they can help. have you got another motor you can try maybe its just the way yours sits on the heat sink and too many shims would probably take away the effect of the heat sink. other than that i don't know.
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Old 09-08-2005, 12:22 PM   #4
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Thanks for the replies guys. I have tried other motors, and they seem to align that way. I will check if the heatsink is flat. And if this don't work, i will have to goto my LHS and beg for some help. Although they seem to be only keen $ suckers.


Thanks
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Old 09-08-2005, 07:36 PM   #5
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I have taken apart the entire rear and reassembled it, measured it, been driven crazy by it. The heatsink is perfectly fine, it lies flat on my tweakboard. However, it seems that the motor does not attach perpendicular to the heatsink. Any ideas anyone??

I am also wondering, are there aluminum bulkheads for the ta04?
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Old 09-08-2005, 08:15 PM   #6
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No aluminum bulkheads for the TA04. You need to make sure all the plastic parts of the bulkheads are straight and are bolting together flat.

You should check to make sure the center shaft (that the spur bolts to and center gears are on) is straight, and the spur holder is straight. I had a center shaft get bent before and messed up the spur gear.
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Old 09-09-2005, 01:20 AM   #7
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The center shaft is straight, i rolled it on a flat surface and there was no severe bumping. things spin smoothly without binding.

How can I check the parts on the plastic bulkhead?
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