Assembly Lube needed for 9n Hydraulic Pump Rebuild???

[LarryMaine]

Just finishing up a full rebuild on my 9n hydraulic pump and am wondering if anyone has any suggestion on whether or not to use assembly lube on the parts prior to assembly. I used STP on my engine rebuild parts, but that is oil based. Would STP negatively impact my hydraulic fluid as it wears out from the pump parts? Did not use lube on prior pump rebuilds with no apparent problems. Also, does anyone have a hack for removing the very bottom sockets in the valve chamber body (part # 9 in figure FO153 in IT manual FO-4)? Mine just wont come out, even with a magnet. Thanks all, Larry.

 

[jimtrs]

(quoted from post at 11:11:04 02/19/22) Just finishing up a full rebuild on my 9n hydraulic pump and am wondering if anyone has any suggestion on whether or not to use assembly lube on the parts prior to assembly. I used STP on my engine rebuild parts, but that is oil based. Would STP negatively impact my hydraulic fluid as it wears out from the pump parts? Did not use lube on prior pump rebuilds with no apparent problems. Also, does anyone have a hack for removing the very bottom sockets in the valve chamber body (part # 9 in figure FO153 in IT manual FO-4)? Mine just wont come out, even with a magnet. Thanks all, Larry.

I don't think a little STP is gonna hurt anything. With that being said, even that thick stuff will probably mostly drain out before start up.

I always pack 'em with white assembly lube, along with bearings, lifter, valve stems, etc on an engine rebuild.

 

[JMOR]

Why? It is submerged in hydraulic oil.

 

[LarryMaine]

Not sure what you are referring to. Nothing is submerged in anything right now, it is all apart. Still cant get
out the bottom sockets. If you are referring to assembly lube, I guess you are saying assembly lube is not needed
because the hydraulic pump will be mostly submerged on start up once installed, so unlike cam bearings which are not
submerged in oil on engine start up, lube is not needed for hydraulic pump?

 

[Jim L WA]

When you reassemble the pump and put it back in the tractor, refill with oil, the pump is submerged in the oil. Like JMOR said, no need for assembly lube.

 

[Btzj02]

I coated the parts with hydraulic oil. The new parts came coated with a thick waxy grease that the hydraulic oil easily removed. I figured I wasn't going to hurt anything!

 

[Bruce(OR)]

I pack engine oil pumps with Vaseline just prior to installation. Your Hyd pump, as said, is going to be submerged in oil and will not suffer
cavitation.

 

[504]

Ditto

 

[Hobo,NC]

Its my nature to put a drop are two of motor oil on the moving parts to at least confirm it turns well on the bench... Any other check of the pump while its on the bench depends on how dedicated you are.

Some like the trial and error way... : (

 

[TheOldHokie]

(quoted from post at 22:17:00 02/19/22) I pack engine oil pumps with Vaseline just prior to installation. Your Hyd pump, as said, is going to be submerged in oil and will not suffer
cavitation.

The N-series hydraulic pump operates on the princile of shutting off the oil inlet as a means of preventing output. As such it is a cavitation machine. But assembly lube is not going to save it and is not going to be of any great benefit on initial install. As Hobo says a few drops of hydraulic oil so things aren't running dry is probably a good idea.

TOH

 

[LarryMaine]

Thanks to all. Sounds like best move is to just coat the new parts with a little hydraulic fluid on assembly.
Actually, the best thing I can do is clean everything up so it is super clean prior to re-assembly. This pump
literally had not been cleaned since 1940, with literally inches of scum inside the bottom of the pump housing.
Ugh, this is why I do preventative maintenance when buying a new old Ford. Thanks again, Larry.

 

[JMOR]

(quoted from post at 21:51:05 02/20/22) Thanks to all. Sounds like best move is to just coat the new parts with a little hydraulic fluid on assembly.
Actually, the best thing I can do is clean everything up so it is super clean prior to re-assembly. This pump
literally had not been cleaned since 1940, with literally inches of scum inside the bottom of the pump housing.
Ugh, this is why I do preventative maintenance when buying a new old Ford. Thanks again, Larry.

ust a few of the hands full of "stuff" that were dug out of the 1950 8N. & no, that isn't from my cows.

 

[lha]

Just finishing up a full rebuild on my 9n hydraulic pump and am wondering if anyone has any suggestion on whether or not to use assembly lube on the parts prior to assembly. I used STP on my engine rebuild parts, but that is oil based. Would STP negatively impact my hydraulic fluid as it wears out from the pump parts? Did not use lube on prior pump rebuilds with no apparent problems. Also, does anyone have a hack for removing the very bottom sockets in the valve chamber body (part # 9 in figure FO153 in IT manual FO-4)? Mine just wont come out, even with a magnet. Thanks all, Larry.

I'm late to the party,but STP was originally Studebaker Transmission Product. It won't do any harm and works as an assembly lube.

 

[Jim.ME]

Only a bit over 4 years, I think he got it done a while ago.

 

[lha]

Only a bit over 4 years, I think he got it done a while ago.

Yes,but I thought I'd add a tidbit of info for those who peruse.

 

[used red MN]

I'm late to the party,but STP was originally Studebaker Transmission Product. It won't do any harm and works as an assembly lube.

Yes,but I thought I'd add a tidbit of info for those who peruse.

If you’re adding a “tidbit” 4 years late it might as well have some validity to it.
The company Chemical Compounds was founded in 1953 by three businessmen, Charles Dwight (Doc) Liggett, Jim Hill and Robert De Hart, St. Joseph, Missouri. Their sole product was "STP Oil Treatment", which was first introduced in 1954; the name was derived from "Scientifically Treated Petroleum". the company was acquired by the Studebaker-Packard Corporation.
Studebaker briefly tied STP into its advertising as an abbreviation for "Studebaker Tested Products".
Looks like "Scientifically Treated Petroleum" has the win as the real acronym.
I suspect your version was cooked up by someone as a derogatory option. Much like FORD could be -Found On Road Dead or Fix Or Repair Daily, since this is a Ford forum I better add GMC -Got Mechanic Coming
As far as assembly lube I was never a proponent of STP, used white lithium grease, GM assembly lube and just plain clean motor oil.