1960 Ford 971 select-o-speed w.f.

steak

Member
Hi folks.My 971 select-o-speed w/a 1 arm loader needs fluid change. A past owner has put pipe fittings and hydraulic hose from the transmission fill port back and under to the hydraulic drain port, my assumption is to increase volume of oil for the hydraulic system .!?
I bought some high dollar oil for the transmission Valvoline 318 , an equivalent of the M2C41 ford specifies but calls for M4864A or B for hydraulic.
I need a filter for the transmission , if anyone knows of a source please Lmk.
I'm thinking the extra plumbing was for fluid volume for the loader. I could be wrong.
Does the 1 arm loader need all that volume to work ? This loader does not have a 2nd cylinder BTW.
I believe that this tractor was ordered with this loader, only 1 headlight ( r side ) and no indications it ever had a light on the left side.
Also , this tractor has the optional 4 wheel front end.
All opinions are appreciated.
 
The one arm loader does need more volume because it has an empty cylinder on the "top" side which does not flow back to the hydraulic system like a 2 way cylinder would. One side of a 2 way cyl always feeds oil back. But if you have the hydraulic system at the full mark with the loader say 2/3 to mostly way up, you should not have any problems. The dip stick says with cylinders extended. It will be a bit overfull when down but there is extra room for the oil.
By 4 wheel, do you mean the Elenco front wheel drive?
 
by optional 4 wheel front end i assume you mean the normal ford factory wife front ( 2 wheels ) as opposed to the ford factory NF ( 2 wheels ) or the ford factor single narrow front ( 1 wheel ).

curious that someone has something tied to your transmission fill? tranny and hyds are seperate sumps on 53-64 machines.

also.. the 2-3g tank for hyds on the 53-64 machines is plenty of a 1-arm loader sump... more than plenty.
 
(quoted from post at 15:21:30 09/06/14)

If it's' a 'new' style SOS with filter on the side,
it's CArquest #85569

.

It's not!

This filter, if it has one, is inside the transmission case. It is currently NLS until Tony Jacobs gets his aftermarket version of it into production. Nobody other than Tony will have an aftermarket version of this filter to the best of my knowledge.
 
You DO NOT want the SOS fluid mixing with the hydraulic fluid. The SOS needs CLEAN fluid to work properly. I'd disconnect that interconnect plumbing right now.
Look at the hydraulic reservoir dipstick and you will see that the hydraulic side (the other side is marked for the front pedestal) is marked "Full With All Cylinders Extended". Raise the One Armed Loader and the 3 point lift. The fluid should be at the Full mark on the stick. Obviously when you lower the loader and lift the fluid will be above the Full mark.
 
and i can for sure verify that there is plenty of room in the hyds sump to have a full sump on the stick, and the large hyd cyl filled and lifted.. and nothing runs over when cyl compressed.
 
Hey, Steve. Thanks for your input.
No sir , not 4wheel drive.
The 971 came standard as
a row-crop front end , both single wheel or dual wheel row-crop front end. An option was a factory add-on wide front end. Isn't quite like the front wheels of a jubilee or 800's etc. The system works off the row crop front housing. Odd looking set up but does have steering assist.
 
Hey , thanks Little Billy for the p.n.
Unfortunately , mine is internal filter.
I will look into converting it to external filter in the future though. Shouldn't be too difficult.
 
Thanks sound guy.
I thought it odd too and confirmed in my book that both transmission and hydraulic system are separate.
I had hoped that there is enough volume in the hydraulic system to work both loader and lift.
A bit over full shouldn't cause problems.
 
(reply to post at 19:05:59 09/06/14)

I am a a loss for a different reason why this is plumbed the way it is.
I will remove the plumbing and it'll be as it should.
 
I'm wondering if the high pressure line running from the pump back through the transmission to the 3 point might have been leaking and causing he hydraulics reservoir to go low on fluid and causing the transmission to overflow, so the previous owner just plumbed them together to give the excess fluid in the tranny somewhere to go and to keep the hydraulics full.
 
Lift takes a soda cans worth of oil or so.

The sump can eat 3gal easy, I have over half a dozen 1- arm loaders on those old fords using Hyds sump
 
Hi Texas.
An update on my select-o-speed and extra plumbing.
Over the weekend I removed the extra plumbing and changed fluids in both transmission and hydraulics using the valvoline w813 for both. After double checking my work I fired it up and after a brief warm up , drove it around cycling through the gears. 5 minutes in I started loosing forward momentum. I parked it , shut it off and checked the transmission fluid level. Couldn't touch fluid with my little finger !???
I pulled the dipstick on the hydraulic system and fluid shot 3-4" in the air !??!!!!
I let the tractor set over night. After church on Sunday morning I checked transmission fluid level again. No longer shot out of dipstick port and could see the fluid in the transmission case....
Obviously there is a line broken or a hole through the compartments but I did not see evidence of either when I flushed the tranny filter. I looked in the transmission case as best I could but did not remove the hydraulic top cover...yet.
Any thoughts/suggestions from you folks is appreciated. Thanks
 
You have a leak on the output housing of your transmission. It could either be a shaft seal or the little pressure switch for your lube light.

Pull the traction disconnect and remove the access cover (the round cover that has the hydraulic dipstick in it). If your hydraulic section is overfull you may wish to drain some oil into a clean container for replacement once the problem is remedied.

With your engine running at idle, observe the transmission output housing (you may need a mirror and/or a flashlight). If it's not a shaft seal leak, and is the pressure switch you can replace the switch without splitting the tractor. The pressure switch is located on the left side of the housing. It is NLS from Ford (CNH) . I bought my last one from O'Reilly's. Don't remember a part number, but it is normally closed and opens at 2psi. I believe it's 1/8" pipe thread, but it may be 1/4".
 
Hello Larry.
Thank You for sharing your knowledge of the select-o-speed system . I'm certain that you saved me unknown amounts of time and money trying to discover this issue.
I will work on this over this coming weekend and let you know what I've found.
Have a great week. Jason H
 

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