Skymaster Forum  

Go Back   Skymaster Forum > Messages
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
Thread Tools Rate Thread Display Modes
  #1  
Unread 02-22-07, 01:16 AM
Skymaster337B's Avatar
Skymaster337B Skymaster337B is offline
Registered User
 
Join Date: Jun 2004
Location: New Mexico
Posts: 508
Skymaster337B is an unknown quantity at this point
Hydraulic filter

Has anyone ever changed or cleaned the hydraulic filter? This is on a 1967 Skymaster (and the filter is mounted on the engine fire wall).

The book says to clean the filter, but I wonder if it is easier and better to replace it with a new one.

Thanks,

Rob
Reply With Quote
  #2  
Unread 02-22-07, 03:56 PM
skymstr02's Avatar
skymstr02 skymstr02 is offline
Ace of the Atmosphere
 
Join Date: Apr 2002
Location: Madison, MS
Posts: 329
skymstr02 is an unknown quantity at this point
Its just a wire screen. Very easy to clean and reinstall.
Reply With Quote
  #3  
Unread 02-24-07, 10:25 PM
Skymaster337B's Avatar
Skymaster337B Skymaster337B is offline
Registered User
 
Join Date: Jun 2004
Location: New Mexico
Posts: 508
Skymaster337B is an unknown quantity at this point
Thanks, sounds easy. And if I can also ask, there's no reason to bleed the system after cleaning the filter, right? My understanding is the system is automatically bleeding.

Also, anything special to clean the filter off? Is it better to use solvent or just compressed air?

Rob
Reply With Quote
  #4  
Unread 02-24-07, 11:19 PM
Ernie Martin's Avatar
Ernie Martin Ernie Martin is offline
Administrator
 
Join Date: Apr 2002
Location: Miami, Florida
Posts: 989
Ernie Martin is an unknown quantity at this point
Do you have the service manual? I wouldn't attempt any work -- even easy ones like this one -- without the service manual. In it you would learn that:

a) you clean the filter with a solvent,
b) you don't need to bleed it, and
c) it calls for you to replace the O-ring with a new one.

I bought both a service manual and a parts catalog (so you can determine the O-ring part number before calling dealers) for $45 on a CD from www.mccurtaintg.com

Ernie
Reply With Quote
  #5  
Unread 02-25-07, 10:41 AM
skymstr02's Avatar
skymstr02 skymstr02 is offline
Ace of the Atmosphere
 
Join Date: Apr 2002
Location: Madison, MS
Posts: 329
skymstr02 is an unknown quantity at this point
Cleaning hydraulic filters/screens is not covered under preventive maintenance in the FAR's, so unless you are a licenced mechanic, you must be supervised by an appropriately rated mechanic in order to perform this task. The mechanic must return the aircraft to service in accordance with 14CFR43.9.
Reply With Quote
  #6  
Unread 02-26-07, 08:54 PM
Keven
Guest
 
Posts: n/a
Or maybe . . . .

This thread got me thinking, and looking at FAR Appendix A (c) "Preventive Maintenance." This is the section that describes what maintenance an owner can self-perform. It's actually a pretty close call.

(c)(8) allows: "Replenishing hydraulic fluid in the hydraulic reservoir."

(c)(23) allows: "Cleaning or replacing fuel and oil strainers or filter elements."

There's a good argument that reading the two sections above together would allow the cleaning of the hydraulic screen.

Shoot, it's easier to get to and clean the hydraulic screen in 337s than it is to get to and clean the fuel strainer elements. It's easier to reach (no body bending), screen is easier to clean (much bigger mesh), and the safetying is easier to do than either of the fuel strainers (no blind safetying -- hopefully less blood).

On the other hand, the FAA clearly knows how to specify hydraulic fluid issues -- which they could have specifically stated in section (c)(23), unless they just consider hydraulic fluid to fall under "oil" category in (c)(23). Neither black nor white, and I've not seen a case on point. But interesting nevertheless.

To be safe, you should learn the system and process, and have your A&P sign it off after you do it and he inspects it. It's easy to do, will save you money, and is easy for the A&P to check. Just know, it ain't rocket science on a 337 AFTER you look at the Service Manual, Parts Catalog, and do it once or twice.

IMHO

Keven
________
Nevada Dispensaries

Last edited by Keven : 04-23-11 at 05:22 PM.
Reply With Quote
  #7  
Unread 02-27-07, 08:26 AM
skymstr02's Avatar
skymstr02 skymstr02 is offline
Ace of the Atmosphere
 
Join Date: Apr 2002
Location: Madison, MS
Posts: 329
skymstr02 is an unknown quantity at this point
I agree, but the government and common sense do not necessarily go hand in hand.
Reply With Quote
  #8  
Unread 03-01-07, 10:38 PM
stackj stackj is offline
Registered User
 
Join Date: Apr 2002
Location: Richmond, VA
Posts: 311
stackj is an unknown quantity at this point
Send a message via AIM to stackj
This could be the understatement of the year. And it was only Feb 27!
__________________
Jim Stack
Richmond, VA
Reply With Quote
  #9  
Unread 06-13-18, 08:07 AM
kilr4d's Avatar
kilr4d kilr4d is offline
Registered User
 
Join Date: Mar 2016
Location: CNC3
Posts: 265
kilr4d is on a distinguished road
Ordered the o-rings, going to pull the screen out and take a look.

I wonder if it's ever been cleaned....
__________________
_________
John K
1977 337G
CNC3
Reply With Quote
  #10  
Unread 06-20-18, 11:55 AM
n86121's Avatar
n86121 n86121 is offline
bigcheese
 
Join Date: Nov 2003
Location: Potomac Airfield~!
Posts: 318
n86121 is on a distinguished road
Just did this during annual

I wish I had the photos from the annual. Both front and rear were like torn window screens. . Replaced. I think they are to keep large moosh out of the hydraulics. Mine were both shot.
__________________
David Wartofsky
Potomac Airfield
10300 Glen Way
Fort Washington, MD 20744
Reply With Quote
  #11  
Unread 06-20-18, 01:42 PM
hharney's Avatar
hharney hharney is offline
Forum Administrator
 
Join Date: Jul 2002
Location: Michigan (8D4)
Posts: 2,253
hharney is on a distinguished road
I have photos of mine. Not too bad when I pulled mine. Cleaned and reinstalled per SM

I'll post a photo when I get back
__________________
Herb R Harney
1968 337C

Flying the same Skymaster for 47 years
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 12:29 PM.


Powered by vBulletin® Version 3.6.9
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.