The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems

Chainsawr, The Worlds Largest Inventory of Chainsaw Parts

Smith Sawmill Service



Author Topic: Sloppy fit of output bearing Sundstrand Hyd. unit  (Read 904 times)

0 Members and 1 Guest are viewing this topic.

Offline Jim1934

  • member
  • *
  • Posts: 46
  • Location: Clarkston, Mi.
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #20 on: July 30, 2021, 09:45:11 AM »
 I have the complete banjo and axle assy.
I stroked the swash plate actuator.
I have the two hose fittings tied together with a hose. Is this a mistake?
  If lift cyl. and its valve were installed path would be blocked when cyl. at end of travel -correct?

One of the check valves has its ball bearing at the bottom
and I can move the ball against its spring via a rod thur the small hole in the bottom.

The other valve has the ball stuck at the top dead headed and cannot be moved.

There is oil on the valves. My valves do not have push buttons on the top.

Thanks, Jim

Offline mike_belben

  • Senior Member x2
  • *****
  • Posts: 9888
  • Location: Middle TN
  • Pulp Friction
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #21 on: July 30, 2021, 03:06:01 PM »
I dont know what the banjo is.


The hose loop is fine, no you dont need a valve in there.  

My cartridge valves are different than yours so i dont really understand what youve got there.  I own a cub with same pump but its 990 miles away or id go llook for you.  Anything that seems stuck in there nedds to be freed up.

My first guess and hope, is the charge pump guts are too dry to lift fluid from the sump at that low rpm. Like those cheap hand crank barrel pumps.  They never lift oil out of a drum until you wet the pump gets, then theyre fine. 


 So wet your pump guts. Pull that loop hose and fill it with oil then try again.  If it still wont work, pull one end of the hose and get a pan to catch oil.  Run it and see if you are getting any flow.  I believe the passenger side (US based) fitting is the output.  It comes from the charge pump.  If its not flowing oil your charge pump cant supply your drive pump.  

Test that first.
Proverbs 19:11

Offline Old Greenhorn

  • Senior Member x2
  • *****
  • Posts: 4845
  • Age: 66
  • Location: Catskill Mountains, NY
  • Gender: Male
  • An old coot, still learning.
    • Share Post
    • Woodsman Forest Products
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #22 on: July 30, 2021, 03:49:40 PM »
I dont know what the banjo is.

I always keep up by reading the 'most recent post' and scrolling through comments like this bring me up short every time and take me down the wrong road until I read a little further in.
 Mike, this is what a banjo looks like:


 
 As played by one of the best (Bill Keith).
 But perhaps that doesn't make sense to you because it is fully assembled and functional. So to put it in terms you might be more accustomed to, this is also a banjo:


 
 Sorry, I could not resist. You may now return to your serious technical discussion and I will shut up. :D
Tom Lindtveit, Woodsman Forest Products
Oscar 328 Band Mill, Husky 450, 372 (Clone), Mule 3010, and too many hand tools. :) Retired and trying to make a living to stay that way. NYLT Certified.
OK, maybe I am the woodcutter now.
I can work with wood, but I am NOT a Woodworker, yet.

Offline Jim1934

  • member
  • *
  • Posts: 46
  • Location: Clarkston, Mi.
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #23 on: July 30, 2021, 04:37:19 PM »
When I was a child, 80 years ago, we called the banjo the nearly spherical cast
housing that connects all its internal gears to the inner ends of the two rear axles.
It looks like the round part of a banjo. Today I read case, carrier, rear end, differential.
Thanks for the humor. Jim

Offline mike_belben

  • Senior Member x2
  • *****
  • Posts: 9888
  • Location: Middle TN
  • Pulp Friction
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #24 on: July 30, 2021, 05:43:14 PM »
Gotcha.  Newer slang for that is diff, chunk and pig. 
Proverbs 19:11

Offline Jim1934

  • member
  • *
  • Posts: 46
  • Location: Clarkston, Mi.
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #25 on: August 01, 2021, 09:29:27 AM »
Tried all Mike's suggestions with no cigar.
Removed charge pump casting, with shaft vertical, 
and it was wet but no oil filled the gap between adjacent gear teeth.
Outer gear 'stuck' to plate below, as one would hope.
Tried rotating casting 180 deg. but did not help.
Small gear is keyed to shaft as it should be.

So now I will change filter, double RPM, and make a sacrifice to the Cub gods.
Thinking about 'warming' stuck valve. Penetrants have not worked. May drill
1/16 hole thru existing hole in top hex nut for punch access.

Doubt if oil viscosity is the culprit.
Thanks to all. Jim.

Offline mike_belben

  • Senior Member x2
  • *****
  • Posts: 9888
  • Location: Middle TN
  • Pulp Friction
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #26 on: August 01, 2021, 09:41:29 AM »
Those big hex cartridges come out for replacement dont they?

If a tow valve is open i think its gonna allow the charge pump flow to bypass the high pressure section.  


Were there any valves or check balls inside when you took it apart?  Hydrostatic transmissions have replenishing devices and one way checks to swap out fluid and make it do the right stuff.  Any chance you lost or installed any of that wrong?
Proverbs 19:11

Offline Jim1934

  • member
  • *
  • Posts: 46
  • Location: Clarkston, Mi.
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #27 on: August 01, 2021, 05:53:06 PM »
Trying to upload pix of valves. Spent many hours.
Have had a gallery with pix for a long time.
Trying to add pix to gallery now not working like I think it should.
Service manual states the two are identical. Not mine
On one the ball is held up towards top via a spring.
On other the ball is held down by, apparently, a spring above it.
Tomorrow I will swap locations.
No guarantee these are the correct valves.
I have not modified them. Removed o ring from one in anticipation of heat.
 

 

Offline mike_belben

  • Senior Member x2
  • *****
  • Posts: 9888
  • Location: Middle TN
  • Pulp Friction
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #28 on: August 01, 2021, 08:57:11 PM »
I really dont know the answer.  


I think i would run the input with a drill and no valve cartridges in place to see if oil is coming up to them.  Thatd atleast tell us if the charge pump is picking up or not.  Maybe spin it both directions. 
Proverbs 19:11

Offline Jim1934

  • member
  • *
  • Posts: 46
  • Location: Clarkston, Mi.
    • Share Post
Re: Sloppy fit of output bearing Sundstrand Hyd. unit
« Reply #29 on: Yesterday at 09:19:41 PM »
Trying to upload pix of valves. Spent many hours.
Have had a gallery with pix for a long time.
Trying to add pix to gallery now not working like I think it should.
Service manual states the two are identical. Not mine
On one the ball is held up towards top via a spring.
On other the ball is held down by, apparently, a spring above it.
Tomorrow I will swap locations.
No guarantee these are the correct valves.
I have not modified them. Removed o ring from one in anticipation of heat.
 
(Image hidden from quote, click to view.)

Took valve apart.
There is only one ball.
I am calling the hex nut in pix "down" or "bottom".
R.H. valve is defective. Spring loaded actuating rod in bottom of valve was corroded ,
stuck down, and could never push the ball upward onto its seat. Seat is above ball in pix.
Short weak spring above ball opposes the other spring.
Will repair and see if that is the solution. Have not tried your, Mike's, last suggestion-yet.
Regards. Jim


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
Sloppy day

Started by Jeff on General Board

76 Replies
3724 Views
Last post January 31, 2021, 11:42:37 AM
by Andries
xx
Sloppy weather

Started by Patrick NC on General Board

4 Replies
169 Views
Last post February 07, 2021, 07:28:59 PM
by hopm
xx
Fixing sloppy joinery

Started by TFwannabe on Timber Framing/Log construction

6 Replies
927 Views
Last post September 20, 2018, 01:01:27 PM
by Jim_Rogers
xx
Sloppy yoke or runny eggs?

Started by sandersen on Forestry and Logging

15 Replies
1379 Views
Last post March 24, 2017, 06:53:15 PM
by sandersen
 


Powered by EzPortal