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SAB Goblin 630/700/770 SAB Heli Division 630/700/770 - Goblin Helicopters Factory Support |
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05-01-2016, 12:54 PM | #1 (permalink) |
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Join Date: Aug 2013
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Black Nitro - Motor Alignment issue.
Having a bit of a belt alignment issue. My main belt is riding about 1mm too low. Adding a shim to crank between the clutch stack seems to be about the only option.
Any one else having this issue yet? I have an OS105, and everything is assembled exactly per the manual. |
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05-01-2016, 01:02 PM | #2 (permalink) |
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Join Date: Aug 2013
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Couple pics for fun.
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05-02-2016, 08:32 AM | #4 (permalink) |
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Join Date: Dec 2012
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Was the kit incomplete?..n/m just reread your post.
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Goblin 380...650-700n..700e....Synergy E5s |
05-02-2016, 08:58 AM | #5 (permalink) |
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Join Date: Jan 2010
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I built mine up this weekend and the bottom of the belt is just flush with the bottom of the pulley.
I spoke with Italy about it and this is fine. The belt should ride up the pulley in operation. On the bench if you spin the head backwards to turn the pulley and clutch bell, the belt will ride down to this position you see. In operation when the clutch engages and the system spins in the correct direction under load, the belt will tend to ride up the pulley and centered. There is tolerance in the mounting holes of the engine case and all the various attachment points as well, so you may be able to loosen things and adjust everything upwards as much as you can if you like. Adding in a .5mm shim between engine bearing and the SAB shaft, OR between the SAB shaft and the clutch bell wouldn't hurt things either if you want. |
05-02-2016, 09:54 AM | #6 (permalink) |
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Join Date: Aug 2013
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Spinning my head backwards results in the belt riding up to flush. Spinning the clutch bell by hand for 4 complete revolutions of the head results in my belt riding .5 - 1mm off the bottom of the main gear. I'm not positive but in operation under load it seems as if it may get even worse.
I'll try to shim my stack tonight when I get home from work tonight. I'll keep this updated with the latest info I find out. If anyone else has this issue as well, and comes up with something other than shimming the whole clutch stack up please share. |
05-02-2016, 10:15 AM | #7 (permalink) |
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Join Date: Jan 2010
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Hmm, spinning the head on mine makes it ride downwards, and the clutch bell by hand upwards.
It depends on the angle of the clutch pulley on the motor I guess. When I tightened down the bolts holding the engine assembly to the frame, I tried pushing the whole assembly as far up as I could. |
05-02-2016, 10:19 AM | #8 (permalink) |
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Join Date: Aug 2013
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You running an OS105?
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05-02-2016, 10:20 AM | #9 (permalink) |
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Join Date: Jan 2010
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Yes, OS105, sorry forgot to mention.
I'm going to play with it further tonight |
05-02-2016, 06:19 PM | #10 (permalink) |
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Join Date: Mar 2015
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Slightly off topic but still related to the motor assembly. ...
Are you guys putting any loctite on the motor shaft when bolting down SAB crankshaft/pinion/clutch stack? Also, second Q...I see in the manual that SAB does not want us to put loctite on the end of the SAB crankshaft when threading it into the fan hub. Am I reading all this correctly? Typically I would assume you'd have to loctite both shafts to combat the vibes. Comments? Thx. |
05-03-2016, 04:04 AM | #11 (permalink) | |
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Join Date: Aug 2013
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Quote:
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05-03-2016, 07:54 AM | #12 (permalink) |
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Join Date: Apr 2013
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I an having the same issue with the motor belt. When I spin the head by hand, the belt rides down and hangs off the gear about 1mm. Is this a symptom of not enough belt tension?
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05-03-2016, 12:02 PM | #13 (permalink) |
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Join Date: Nov 2013
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You shouldn't spin the head by hand and watch the belt. That is a little deceiving.
What you should do is rotate the clutch bell (pinion gear) whatever you wanna call it nowadays with your fingers in the direction of motor operation and watch what the belt does. If you don't like whats happening flip the belt around and see what happens. If you still don't like whats happening loosen bolts a bit and see if there is a little bit of wiggle room up and down or on a diagonal to achieve correct alignment. If its still not working out try it on the bench under the motor operation blades off and see whats happening. If its still no good can you lower the secondary down a bit instead of raising the motor ? Edit : I should have said instead of raising the pinion not the motor |
05-03-2016, 12:41 PM | #14 (permalink) | ||
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Quote:
Quote:
PS on a side note... Am I the only one a little leery of the clutch clearance? Mine was pretty loose, hope this doesn't turn into a beer can mod to prevent the clutch shoes from fraging like my NX4. |
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05-03-2016, 07:04 PM | #15 (permalink) |
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Join Date: Jul 2012
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i've got the same belt issue. I'll try it once but i don't see it riding back up
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05-03-2016, 10:39 PM | #16 (permalink) | |
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Join Date: Aug 2013
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Quote:
If not I'm going to have to figure out where to get some shims. |
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05-04-2016, 08:08 AM | #17 (permalink) |
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Join Date: Jul 2012
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Let us know please how it goes
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05-04-2016, 10:36 AM | #18 (permalink) |
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Join Date: Aug 2013
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I sure will.
Wish me luck on the maiden.. |
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