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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Align Trex 600 DFC head issue
05-23-2020 02:06 AM  9 months ago
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lazy-b

rrApprentice

Manila, Philippines

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Align Trex 600 DFC head issue
Guys, I just got this Align DFC head. The whole head is totally removed from the frame, Upon eximining the movement of swashplate, I feel there is a binding, I can only tilt the swashplate on half side but the other half I need to put more effort but I can make it move....my feeling that the Feathering shaft might be bended or the head Arm is slightly bended.

I Rotated the Feathering Shaft but did not see any Wobble on the head, this prove the feather shaft is not bend. Then I move the swashplate up and down to simulate the extreme movement of the pitch and I find the ball link at the swashplate move sideway about 3 mm, this supposed to have a 0 movement.

I did check on both and same thing happen. Now I remove the swashplate, and move the linkkage up and down, I did really see the ball linkage move side way by 3 mm.

I am not sure if this is defective, or a normal wear due to long use. cause I do not have a brand new to compare.

Here is the actual video to show the binding or SPRING effect of swashplate.

Watch at YouTube

Hope some one can comment on this.
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05-23-2020 02:16 AM  9 months ago
helitom

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Pine Grove, Calif, USA

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Disconnect the swash from the head and see if the spring back disappears. If it does the problem is in the head and not the swash.

Disassemble the head and make sure there are no bent/broken parts. Check the feathering shaft dampeners for wear/coming apart/rotting from being sprayed with lubricant that may be attacking the dampener material. If the dampener material is rotted/decayed it may be grabbing the feathering spindle causing the spring back you are experiencing.

With a problem this obvious I would disassemble the whole head just to make sure there are no more surprises.
The older I get, the fewer things seem worth waiting in line for.
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05-23-2020 08:47 AM  9 months ago
lazy-b

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Manila, Philippines

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Yes.....Will do that......and finally found the real of the issue...Thanks

Here before replacing the 2 bolts..

Watch at YouTube

Here is the 2 bolt found bended..

Watch at YouTube

Here after replacing the 2 bolts..

Watch at YouTube

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05-24-2020 08:39 PM  9 months ago
Rojoalfa

rrKey Veteran

Punta de Mata, Monagas-Venezuela

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/
/

Very common problem with a rotor after a crash.

That is why you need to check everything... Bearings, spindle, bolts, ball links, links... Lengths...

Very good!

/
Saludos cordiales,
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05-30-2020 04:15 PM  9 months ago
readytofly

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tuvalu

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this is why I don't like dfc heads. the design puts to much stress on the grip arms and bolts. in my opinion, it is an unnecessary upgrade. it may not have been caused by a crash either. normal usage and wearing can bring things to this.
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