Go Back  PPRuNe Forums > Aircrew Forums > Rotorheads
Reload this Page >

JetRanger drive shaft boot

Rotorheads A haven for helicopter professionals to discuss the things that affect them

JetRanger drive shaft boot

Old 24th Feb 2020, 03:14
  #1 (permalink)  
Thread Starter
 
Join Date: May 2002
Location: Australia
Posts: 4,453
Likes: 0
Received 0 Likes on 0 Posts
JetRanger drive shaft boot

A friend of mine with a JetRanger III has been forced to replace the drive shaft boot three times in a matter of months less than 10 hours of operation.

Grease was being sprayed around and the tele temps were black.

Does anyone have any suggestions on why this could be happening? Normally the boot lasts for many years
Dick Smith is offline  
Old 24th Feb 2020, 03:50
  #2 (permalink)  
 
Join Date: Feb 2020
Location: Canada
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
If the engine has been out recently? I have experienced this once after an engine change it ended up being an alignment issue.
Milo450 is offline  
Old 24th Feb 2020, 03:51
  #3 (permalink)  
 
Join Date: Apr 2003
Location: USA
Posts: 375
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Dick Smith View Post
A friend of mine with a JetRanger III has been forced to replace the drive shaft boot three times in a matter of months less than 10 hours of operation.

Grease was being sprayed around and the tele temps were black.

Does anyone have any suggestions on why this could be happening? Normally the boot lasts for many years
Contaminated grease?
havick is offline  
Old 24th Feb 2020, 04:01
  #4 (permalink)  
 
Join Date: Feb 2020
Location: Canada
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Not sure if my first reply worked so Ill try again. Ive had this problem before. We had the engine out for maintenance when it went back in it blew a boot in 3 hours tuned out to be an engine alignment issue. If there hasnt been any major maintenance done it might be worth checking if something has moved.
Milo450 is offline  
Old 24th Feb 2020, 04:50
  #5 (permalink)  
 
Join Date: Sep 2002
Location: Great South East, tired and retired
Posts: 3,982
Likes: 0
Received 9 Likes on 6 Posts
I had one let go some years ago up at Surface Parasite.

Maybe the drive shaft is slightly misaligned? That would make the joints work really hard when under load, get hot and perhaps rupture the boot. But I am not an engineer. Does Russell at Camo's have a theory?
Ascend Charlie is offline  
Old 24th Feb 2020, 06:22
  #6 (permalink)  
 
Join Date: Apr 2014
Location: At work (Often)
Posts: 20
Received 0 Likes on 0 Posts
Perhaps the isolation mount has gone soft.
Falcon Al is offline  
Old 24th Feb 2020, 07:00
  #7 (permalink)  
 
Join Date: May 2010
Location: New Zealand
Age: 50
Posts: 395
Likes: 0
Received 0 Likes on 0 Posts
Check W&B on the flights he's doing. if really out of whack, that wouldn't help.
SuperF is offline  
Old 24th Feb 2020, 07:31
  #8 (permalink)  
 
Join Date: Mar 2013
Location: Australia
Age: 53
Posts: 56
Likes: 0
Received 0 Likes on 0 Posts
A good solution

https://www.kaman.com/sites/default/files/206B.pdf
Autonomous Collectiv is offline  
Old 24th Feb 2020, 07:57
  #9 (permalink)  
 
Join Date: Apr 2005
Location: England
Posts: 359
Likes: 0
Received 5 Likes on 2 Posts
A friend of mine with a JetRanger III has been forced to replace the drive shaft boot three times in a matter of months less than 10 hours of operation.

Get a new maintenance provider.
jeepys is offline  
Old 24th Feb 2020, 10:55
  #10 (permalink)  
 
Join Date: Sep 2002
Location: Great South East, tired and retired
Posts: 3,982
Likes: 0
Received 9 Likes on 6 Posts
As shown above, the Kaflex shaft fixes the problem.
Ascend Charlie is offline  
Old 24th Feb 2020, 12:02
  #11 (permalink)  
 
Join Date: May 2002
Location: Wanaka, NZ
Posts: 2,570
Likes: 0
Received 1 Like on 1 Post
You'd want to fix the alignment problem before changing to the Kaflex, surely? Something is abundantly wrong if the coupling is throwing 205 grease after only 10 hours.
gulliBell is offline  
Old 24th Feb 2020, 12:03
  #12 (permalink)  
 
Join Date: Sep 2000
Location: states
Age: 67
Posts: 160
Likes: 0
Received 0 Likes on 0 Posts
Mount

Originally Posted by Falcon Al View Post
Perhaps the isolation mount has gone soft.
If the engine mount shims were not disturbed, its the isolation mount...
rotormatic is offline  
Old 24th Feb 2020, 15:18
  #13 (permalink)  
 
Join Date: Oct 2006
Location: USA
Posts: 590
Likes: 0
Received 3 Likes on 2 Posts
Originally Posted by Dick Smith View Post
A friend of mine with a JetRanger III has been forced to replace the drive shaft boot three times in a matter of months – less than 10 hours of operation. Grease was being sprayed around and the tele temps were black. Does anyone have any suggestions on why this could be happening? Normally the boot lasts for many years
Engine side? Have them check to insure the firewall driveshaft covers and cones are installed properly. In some cases if installed 180 out will cut boot on engine side. Temp Indicator go black because of loss of grease. As to alignment or iso mount bad, if they were that bad these same firewall covers/cones would be wiped out first and probably the shear plate for the "donkey d..." as well mounted to the bottom of the xsmn.



Last edited by wrench1; 24th Feb 2020 at 15:25. Reason: add diagram
wrench1 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2022 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.