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HomeAircraftHelicopterAlignT-REX 700N › Engine spins, Blades don't!!
01-14-2011 12:07 AM  7 years agoPost 1
94SSled

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Jacksonville FL

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YS91sr runs great, just won't spin the head much. The main gears are spinning up with the motor, but the blades just barely spin. I can hold the blades and spin the main gear each way with little friction. Is my one way bearing shot?? I'm now having the same issue with the 700E I just purchased.. Is there any way to check this other than holding the blades?

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01-14-2011 12:09 AM  7 years agoPost 2
jackheli

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Vancouver - Canada

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Clutch?

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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01-14-2011 12:21 AM  7 years agoPost 3
HiroboFreak

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Central Coast, NSW, Australia

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Engine running backwards due to rich low end?

EDIT: Just read the post again.

Is the lower main shaft Jesus bolt in place?

If you can spin the main gear both ways while holding the rotorhead then I'd say your one-way is shot.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
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01-14-2011 12:55 AM  7 years agoPost 4
Mike Fortin

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USA

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It does sound like your engine is running backwards.

Try leaning a few clicks.

Have Rotors, Will Fly!

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01-14-2011 01:04 AM  7 years agoPost 5
jackheli

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Vancouver - Canada

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IF the engine is running backwards the clutch may be stuck...

Which way are the main blades slowly spinning? Counter or clockwise?

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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01-14-2011 01:26 AM  7 years agoPost 6
P Johnston

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Ann Arbor MI

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Take the main hub out and tighten the 6 bolts on the top of the hub that keeps the one way in. If these bolts are just a tiny bit loose, the one way will let go. I have seen it happen quite a few times.

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01-14-2011 01:26 AM  7 years agoPost 7
Ladymagic

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South Korea

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This is one of those things that is better diagnosed visually. But, based on your description, it sounds like you simply missed your lower shaft bolt hole somehow. Although, you stated that your engine is running good, it is still possible that it might be running backwards too. Usually an engine won't run well backwards when you try to increase the throttle. But, check that it is running in the correct direction anyways. It could also be a clutch problem. Maybe your clutch isn't engaging correctly. I know this is probably all stuff you've already checked, but I would check them all again just in case you missed something. I don't think your one-ways are bad already. Just reinspect your drive train and make sure all your hardware is installed and in the correct postion and I think your problem will be quickly rectified. Check and make sure your clutch gap is correct and also ensure that all the hardware on the clutch stack is tightened.

You can remove your engine and try to rotate the head using your hand on the main gear. When you rotate the main gear counter clockwise, the head shouldn't rotate with the gear. When you rotate the gear clockwise, the one-way should catch and spin the head. If that's what happens, then I would focus my attention on the clutch stack. If not, just check your upper and lower shaft bolts. Good luck and please let us know what you find.

Mellisa

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01-14-2011 02:59 AM  7 years agoPost 8
dkshema

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Cedar Rapids, IA

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I can hold the blades and spin the main gear each way with little friction.
Bolt missing as noted above, or the one-way clutch is out of action.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-14-2011 04:50 AM  7 years agoPost 9
ch-47c

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san jose, ca

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Did your tail rotor spin up and not the mains, when you brought your throttle up? That's also a good indication engine is running backwards.

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01-14-2011 02:01 PM  7 years agoPost 10
PC12DRVR

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USA

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Its probably your one way bearing installed upside down. Grab the clutch during spool up and see if it grabs. If it does and your bolts are all there you either have a bad one way bearing or it was installed upside down accidentally.

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01-14-2011 10:11 PM  7 years agoPost 11
marc8090

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Long Island, N.Y.

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If the main gear can spin both ways while holding the head AND everything is assembled correctly then it's the one way in the main gear hub.

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01-16-2011 08:15 PM  7 years agoPost 12
94SSled

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Jacksonville FL

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HELP!
I'm trying to remove the main shaft to inspect/replace the one way and the shaft won't move! I removed the lower bolt, tried using a pry tool on the bottom of the shaft and nothing.. I even tried heating the upper/lower bearings to free it. The shaft has been in and used for approx six months. Any idea's??

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01-16-2011 08:52 PM  7 years agoPost 13
Heli 770

rrProfessor

USA.

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Most likely the one-way bearing shaft is stuck to the main shaft. Try to get penetrating oil between both part. You can take your head and swash plate off and use your main shaft as a makeshift slide hammer with a socket.
Good Luck.

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01-17-2011 07:56 AM  7 years agoPost 14
AaronJohnson

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mason,MI

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When you get it apart be sure to check those 6 bolts that hold the one-way housing together like pjohnston said. I have seen those be slightly loose many times on 700s and the one-way will slip. Tighten bolts and one-way works fine. A one-way failure would be unlikely

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01-18-2011 02:01 AM  7 years agoPost 15
94SSled

rrNovice

Jacksonville FL

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GOT IT...
Thanks guys! I finally pulled the head off and used a socket and allen wrench to get the shaft out. All bolts were tight "unlike on my 700E" and the one way was horribly gooped up with old grease. I cleaned it and re-lubed and she works great! Thanks again everyone!

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01-18-2011 03:51 AM  7 years agoPost 16
dkshema

rrMaster

Cedar Rapids, IA

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FYI -- clean and lube the one-way clutch with Automatic Transmission Fluid. You don't need to pack it with grease, or use grease at all.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-18-2011 09:44 AM  7 years agoPost 17
Ladymagic

rrKey Veteran

South Korea

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Glad to hear that you got it all worked out. Have fun out there and be safe mister

Mellisa

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HomeAircraftHelicopterAlignT-REX 700N › Engine spins, Blades don't!!
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