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Old 01-22-2006, 09:21 PM   #1
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Default FT TC4 Bellcrank Question

i have a question. i have a ft tc4 with the stock drive shaft, stock servo horn, and a hitec 645 mg servo. when i turn right, the ball cup on the bellcrank rubs on the drive shaft. does anyone know how to prevent this?

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Old 01-23-2006, 08:27 AM   #2
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If you have a Radio with EPA (End Point Adjustment) turn it down until it doesnt rub.
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Old 01-23-2006, 09:20 AM   #3
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i'll try it. thanks.

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Old 01-23-2006, 10:54 AM   #4
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the only thing is that i need the extra steering for the right and left.

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Old 01-23-2006, 10:56 AM   #5
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Also make sure your servo horn is centered correctly!
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Old 01-23-2006, 11:03 AM   #6
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Shave your ball cups with an x acto until they stop hitting. Some servos don't fit as well, so some hand fitting might be required.
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Old 01-23-2006, 11:43 AM   #7
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yeah, that's a good idea for the xacto shaving. i'll try that. it might also be my servo, because it might be higher than others. thanks.

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Old 01-23-2006, 02:23 PM   #8
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i tried cutting down some of the ball cup. i cut it doen to where i can barely see the threads. oops. it bends now, and it still rubs. i think that the servo gear is too high. i'll put in a differnt servo and try.

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Old 01-23-2006, 04:01 PM   #9
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How much slop do you have in your steering rack? Reducing that should also help. I used black input drive shims or two under the hex of the flange bearings and filed/sanded the forward flange bearings till the excess slop was gone.
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Old 01-23-2006, 07:13 PM   #10
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i added one drive shim on each side on top of the bearings so the rack would sit lower and not have as much slop. i think it's pretty good now. do you think i should add one more to each side?

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Old 01-24-2006, 05:49 AM   #11
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Sure it won't hurt to add another. The shim is clamped down on the inner race of the bearing so nothing should bind, just check it before reconnecting the servo.
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Old 01-24-2006, 07:57 AM   #12
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hmmmm
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Old 01-24-2006, 02:58 PM   #13
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ok. i'll try it. i might get a low profile dervo, cause i need a new one anyway. i think the gear where the servo horn mounts on is higher than most. so, i think i'll get the futaba S9550.

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