Grease the main gear and OWB gear?

[mame]

Hi guys, Having just a few flights on my Hurri I noticed the thin film of the fine black dust (plastic filings) on the inner side of the canopy just close the the main gear. I assume the black plastic cogs are wearing out very fast. I applied thin layer of the silicone grease on both front and rear plastic gear. However I noticed in one of the threads here that grease on the OWB gear can damage the OWB? Does anyone have such an experience? Can you elaborate a bit what exactly can break? Grease or don't grease the gears?

Thanks,
Martin

[mysticmead]

if the mesh is set correctly, then no grease is needed on the gears... as far as the OWB.. they are refering to packing the bearing with grease.. not grease on the teeth... petroleum based grease can break down plastics.. the cage for the bearings in the OWB is made of plastic... so don't grease the bearings... some have had fair to good results by soaking the OWB in automatic transmission fluid....

the OWB is the one bearing you want to lock up... that's how it works...for me, I don't grease the gears or OWB...

[mame]

Hi Mystic, thanks for the valuable comments. I used silicone-based grease with teflon. I assume it should not be eating the plastic gears. I have not greased the OWB bearing, just the teeth. I set up the mesh based on instructions I found here, I believe it is OK.

Thanks!
Martin

[mysticmead]

just remember, the gears are not perfect... there will be high spots.. you might be seeing those high spots being evened out.

[kahn10]

also grease or lube of any sort on plastic gears captures dust etc and promptly turns itself into grinding paste.the gears are made of whats known as self lubricating plastic....you want to run them bone dry....:smokin:

[mame]

exactly, I never had problems with the plastic gears on my other helis. Nothing like excessive abrasion. It just surprised me to see the amount of the black dust collected just after 4 flights. I assumed the used material (black plastic) on the gears of hurri is not self lubricating. I clean them and re-lubricate them frequently (every flightday), to prevent the problem with the grinding paste. I believe I quit this exercise and leave the gears bone dry,

Thanks, guys.
Martin

[kahn10]

anyone wishing to scientifically prove this to themselves in a controlled environment should go and have sex on a beach.the results should speak for themselves....

[Jerrymac]

anyone wishing to scientifically prove this to themselves in a controlled environment should go and have sex on a beach.the results should speak for themselves....

Is that what you call 'raw sex'? Actually most plastic is made from petroleum , so I usually lube the plastic parts with a little dab of kerosene on a Q-tip. Seems to give it a little lube, but doesn't really collect too much dust.

[charosenz]

if the mesh is set correctly, then no grease is needed on the gears... as far as the OWB.. they are refering to packing the bearing with grease.. not grease on the teeth... petroleum based grease can break down plastics.. the cage for the bearings in the OWB is made of plastic... so don't grease the bearings... some have had fair to good results by soaking the OWB in automatic transmission fluid....

the OWB is the one bearing you want to lock up... that's how it works...for me, I don't grease the gears or OWB...

I just spooled up my new-to-me (used) 550 and the OWB does not "Grab". I bought it from a guy who said it was working fine when he sold it and I I believe the guy and he has a great rating. The ship is in very very good condition.

I took it appart and thought it may have just got too much grease in it. I cleaned it thoroughly and put a slight drop of oil in it and got the same results. But outside of the heli it locks up perfectly - very solid - everytime. I cleaned it again and this time did not grase or oil it at all. Same results. If I put even the slightest side pressure on the OWB it locks up perfectly. But in the heli it of course has no side load and hence it spins freely - without locking up like it should.

I have a new one on order, but I was wondering if I am missing anything?

[mysticmead]

have you tried reversing the motor direction by swapping 2 of the wires? if the motor turns the wrong way it won't grab...

[charosenz]

Moved to another thread sorry.

[charosenz]

have you tried reversing the motor direction by swapping 2 of the wires? if the motor turns the wrong way it won't grab...

Yes. I reversed the motor wiring and same results. The top gear just turns either direction with no engagement with the bottom gear. Unless I put slight - very slight pressure on the OWB and it works perfect.

As far as the wiring goes, that was fun too. I have a Z30a Tonic and the colors don't match with the ESC at all. I read several manuals of various ESC and I was suprised there was NO comment about which lead of the motor to hook up to which lean on the ESC other than it said if it did not turn in the right direction, to change ANY two wires. Another guy told me that as long as you keep the middle wire of the motor connected to the middle wire of the ESC, you can swap the outer two wires for reversing the rotation direction. SO that is what I have done. But....still no luch on the OWB.

I also am wondering about those VERY thin washers. There is virtually nothing in the manual showing where they go. The show them between two bearings but don't show the OWB in the view at all. I don't thnk Finless video show two of them either, but the manual shows two. Mine only came with one.

I doubt this will cause the OWB to catch or not but.....I am at a loss.

Is this how OWN bearings fail? to just quit grabbing? or Grab intermittenly? I would have thought they would have just started grinding like most bearings....

[xodarap1]

Just use one washer under the owb.
I know this is a silly question, but are you sure the owb is not installed upside down?
If it's not upside down, then it sounds like the owb is bad.
And yup, when the owb only grabs sometimes, or not at all anymore, then they are shot or gummed up.
In total, i've only gone through 6 owb's and 3 main and owb bearing block sets and that is on two hurris over the last 12 months of almost daily flights. For the cost and performance i've got out of them.. i'm still impressed and amazed with all the replacements and bearing failures i've read about. Lol.. maybe my hurris are bionic lol.. :dontknow:)

[kahn10]

i agree with you about the accuracy of the set up bro....but.....i don't think that things like the owb bearings should be housed in a way that they can be out of alignment.that and be tin foil with steel flyshit between it.it should be something like a C type housing with the bearings fixed in alignment.saw the results of someones attempt to assemble a brand new standard 550 recently who ended up sending it back to the supplier to assemble....un ****ing believable.3 undersized servo wheels with random balls.......everything out of alignment...and i mean everything.luckily he shorted the esc the first time he plugged it in

[xodarap1]

I agree Marco. It's a shame that Gaui didn't make the bearings larger with a similar block setup to the Rex 600. I wouldn't even need ceramic to be happier, just larger/beefier bearings with no block play on the cf setup would have been nice.

*Oh.. i'm not sure if these owb shaft bearings for the bearing blocks are exactly the same as the Gaui stock ones, ..but the price was right and i've rebuilt with them (they look the same as the Gaui ones to me) and have been holding up ok so far for two months of daily abuse:

Thunder Tiger Raptor Series
PV0046
Elevator Arm BRG 4830/4870

..and the ones for the main mast were:

Thunder Tiger Raptor Series
PV0046
Ball Bearing, d8xD12xW3.5

[mjdee14]

if the OWB is not engaging.....flip it "upside down" you might have the motor turning the right way, but the OWB will only catch in one direction....

I believe my motor turns clockwise looking down on it......spinning the 1st and OWB counter clockwise....

On my OWB...the writing on the inner bering in the gear goes on the bottom....

I alwasy have to check before I install it.....take the shaft in the OW gear and it it should catch only when the shaft is spun CC

[charosenz]

I have the bearing installed as shown in Finless video. With the side with the bump on the side - top/up - with the screw in the end.

Also, the thing that makes me believe it is not an orientation issue is that the main rotor shaft spins freely in both directions (unless I put a slight pressure on it from the side, like my finger). But...I will triple check this for sure.

I will also check that motor spins clockwise, to turn the OWB shaft counter clockwise, to have the main shaft spin clockwise (as looking down).

[mjdee14]

you might just have a bad one way bearing.....I know some guys have used transmission fluid on them....we usually don't lube them but I wouild try some WD40 on the roller to maybe loosen them up......it should grab the shaft with no problem.....or tension needed.....

[xodarap1]

Another thing to check would be the owb shaft itself. If it was run with a bad or failing owb at some point, it could have worn the shaft just enough in that area that a new owb won't engage on it properly anymore.

[charosenz]

I checked the orientation and it is like the manual suggests and what Finless shows in his vids. Not sure why, but is just only grabs very infrequently. When I thumb the top front 42t gear counter clockwise it only grabs about 1 out of 5 times. When I spin it clockwise, it never grabs.

Just got to be a bad bearing.

Thanks for the help though....

[charosenz]

Another thing to check would be the owb shaft itself. If it was run with a bad or failing owb at some point, it could have worn the shaft just enough in that area that a new owb won't engage on it properly anymore.

I thought about that too. It ranges between 8.01mm to 8.03mm throughout the area where the bearing rides. It does not appear to be worn.

But it does appear as though the bearing would function on a shaft just slightly, larger, say, 8.08mm or so. But I will just have to wait for the new one to arrive. I ordered a new shaft too just in case.....

[mjdee14]

I thought about that too. It ranges between 8.01mm to 8.03mm throughout the area where the bearing rides. It does not appear to be worn.

But it does appear as though the bearing would function on a shaft just slightly, larger, say, 8.08mm or so. But I will just have to wait for the new one to arrive. I ordered a new shaft too just in case.....

run it up to the top of the shaft and see if it catches any better....

the shaft is a cheap replacement.....the bearings arn't bad....but who likes to spend $10