Hydraulic Fluid Drain Plugs

SGW

New User
I?m going to be changing the hydraulic fluid today in my 8N and wanted to find out if I need to use any sealants or something else to keep the three drain plugs from leaking after refill. I also bought a pto assembly. Do I need anything on the gasket to minimize the possibility of a leak? Thanks in advance for the help!
 
(quoted from post at 10:53:59 09/22/18) I?m going to be changing the hydraulic fluid today in my 8N and wanted to find out if I need to use any sealants or something else to keep the three drain plugs from leaking after refill. I also bought a pto assembly. Do I need anything on the gasket to minimize the possibility of a leak? Thanks in advance for the help!

Just the gaskets (preferably new) on the two larger drain plugs and a little PTFE tape on the pipe plug.

TOH
 

Okay, thank you. I guess I?ll put this off until next weekend after ordering parts. I have a follow up question. The tranny is low on fluid (at the end
of dipstick), so I?ll need to top it off before mowing today. I purchased the heavier 90 wt gear oil for Ford tractor instead of UTF because the
hydraulics knock, and I?m in AZ where it gets a little warm. I?m not sure what?s in the tranny now, but is it okay to top off with the 90 wt, even if
there is something different in there now?
Thanks again!
 
(quoted from post at 12:17:46 09/22/18)
Okay, thank you. I guess I?ll put this off until next weekend after ordering parts. I have a follow up question. The tranny is low on fluid (at the end
of dipstick), so I?ll need to top it off before mowing today. I purchased the heavier 90 wt gear oil for Ford tractor instead of UTF because the
hydraulics knock, and I?m in AZ where it gets a little warm. I?m not sure what?s in the tranny now, but is it okay to top off with the 90 wt, even if
there is something different in there now?
Thanks again!

Shot answer yes but if you purchased a 5G pail you will probably come up short when you do the change.

TOH
 
The key to the drain plugs not leaking is to ensure you remove ALL the old gasket material from both the plugs and the mounting surfaces they fasten to. The OEM gaskets are/were cork and is what I prefer to use. They sell rubber ones nowadays at some places but I've not had a liking to them; actually had one pinch and tear at installation. The standard procedure for draining the oil is to first start at the rear end diffy case with the 1/2-14 Pipe Plug. I use a large wash tub for the oil pan. The plug has a 9/16" square head on it but my experience has shown that many times this has been neglected over the years and thus is pretty frozen solid in. Start with a 9/16 open end wrench but if it won't budge, don't force it and risk rounding off the square head. I don't advise using pliers or channel locks either for the same reason. Try a square socket or breaker/cheater bar on the open end wrench or even a Crescent wrench. It's amazing how a 2-3 foot breaker bar can give additional torque. Let oil drain for a good 15-20 minutes and leave open. Next move forward the next larger drain plug. It uses an 1-1/6" AF (Across Flats) hex wrench. I use a 6-point 1-1/16" socket. Let oil drain and leave open. Move forward to the final drain plug and repeat. When replacing the plugs, I have always used clean, fresh hydraulic oil on the gaskets and threads, and never and Teflon tape. On the rear diffy plug I apply just a dab of Ant-Seize just so the next time it will be easier to remove. The hydraulic system capacity is 5 gallons but I caution not to replace it all at once when replenishing it new. I'd add about 3.5-4.0 gallons and work the system then check dipstick and add as needed. On the PTO shaft replacement, just follow the procedure in the manuals. The original PTO had a 1-1/8" splined shaft. Later on, Ford changed to the industry standard 1-3/8" spline and a new PTO shaft. They only make and sell the latter nowadays and I believe they also are a tad bit longer.

Tim Daley(MI)
 

[i:41beee3d74]"The original PTO had a 1-1/8" splined shaft. Later on, Ford changed to the industry standard 1-3/8" spline and a new PTO shaft. They only make and sell the latter nowadays and I believe they also are a tad bit longer."[/i:41beee3d74]

yes, the 1 3/8" PTO shafts are longer - long enough that the PTO cap that came with the original shaft is unusable. they come with a longer cap to accommodate the extra length sticking out of the tractor.
 

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