Sos oil drain plug removal

So... it looks like the PO snapped off a 1/4-20 bolt in
the drain plug hole.

Is there a way to extract that drajn plug without
damaging it?
 
clean the area with brake cleaner and compressed air (wear goggles), then lubricate with a penetrating type lube, and get at it with water pump pliers - it's sealed with an o-ring, grab the outside of the assembly and twist to loosen things a bit, then work it out a little bit at a time -
 
Got it out. Press fit. A tap with a flat head and then vise grips pulled it. Thought it was a thread fit. Oil is a green shade of milk of magnesia. Screen filled with coagulated oil squirts.
 
Good Lord!

If mine, I would change it twice. Change the filter the second time.

Use generic oil meeting the CNH 134D specs the first time and operate the tractor a bit before changing the second time. Be sure to get it fully up to temperature. Use good oil meeting the CNH 134D specs the second time and change the filter.

If the screen shows contamination after the first change, you may want to repeat the first step.

Dean
 
Thanks! I just posted some questions above. 60.00 for each fluid change is expensive. I dont have a filter on hand but i replaced it about 150 hours ago.
 
(quoted from post at 11:25:26 05/29/19) Got it out. Press fit. A tap with a flat head and then vise grips pulled it. Thought it was a thread fit. Oil is a green shade of milk of magnesia. Screen filled with coagulated oil squirts.

I do not believe that the welch plug on the bottom is intended to be the drain plug. I'm pretty sure that the proper way to drain that transmission is to remove the pickup screen housing on the left side down low, as you are supposed to clean that screen every time that you change the fluid. Do you have an Operator's Manual? That will have the proper procedure for draining and filling the transmission fluid, as well as cleaning the pickup screen and changing the internal filter.
 
(quoted from post at 21:11:23 05/29/19)

I do not believe that the welch plug on the bottom is intended to be the drain plug. I'm pretty sure that the proper way to drain that transmission is to remove the pickup screen housing on the left side down low, as you are supposed to clean that screen every time that you change the fluid. Do you have an Operator's Manual? That will have the proper procedure for draining and filling the transmission fluid, as well as cleaning the pickup screen and changing the internal filter.

I think OP is talking about the pickup screen and plug. I don't think he's in error on what he pulled.
 
Thanks, Sean. I pulled the correct drain plug on the lower left side near the foot rest. The
manual wasn't clear that it is pulled out, But this is a first and i lack the benefit of experience and
confidence that i know how what I'm doing.
 
(quoted from post at 19:11:23 05/29/19)
(quoted from post at 11:25:26 05/29/19) Got it out. Press fit. A tap with a flat head and then vise grips pulled it. Thought it was a thread fit. Oil is a green shade of milk of magnesia. Screen filled with coagulated oil squirts.

I do not believe that the welch plug on the bottom is intended to be the drain plug. I'm pretty sure that the proper way to drain that transmission is to remove the pickup screen housing on the left side down low, as you are supposed to clean that screen every time that you change the fluid. Do you have an Operator's Manual? That will have the proper procedure for draining and filling the transmission fluid, as well as cleaning the pickup screen and changing the internal filter.

Sean, the proper procedure for removal of that plug is to screw a 1/4 -20 cap screw into the hole and pull on it to slip the plug out. More pull is needed after years of not being pulled.
 
(quoted from post at 07:26:31 05/30/19)
(quoted from post at 19:11:23 05/29/19)
(quoted from post at 11:25:26 05/29/19) Got it out. Press fit. A tap with a flat head and then vise grips pulled it. Thought it was a thread fit. Oil is a green shade of milk of magnesia. Screen filled with coagulated oil squirts.

I do not believe that the welch plug on the bottom is intended to be the drain plug. I'm pretty sure that the proper way to drain that transmission is to remove the pickup screen housing on the left side down low, as you are supposed to clean that screen every time that you change the fluid. Do you have an Operator's Manual? That will have the proper procedure for draining and filling the transmission fluid, as well as cleaning the pickup screen and changing the internal filter.

Sean, the proper procedure for removal of that plug is to screw a 1/4 -20 cap screw into the hole and pull on it to slip the plug out. More pull is needed after years of not being pulled.

Are you saying that is the recommended plug to remove to drain the transmission when you change the fluid?
 
(quoted from post at 06:03:12 05/30/19)
(quoted from post at 07:26:31 05/30/19)
(quoted from post at 19:11:23 05/29/19)
(quoted from post at 11:25:26 05/29/19) Got it out. Press fit. A tap with a flat head and then vise grips pulled it. Thought it was a thread fit. Oil is a green shade of milk of magnesia. Screen filled with coagulated oil squirts.

I do not believe that the welch plug on the bottom is intended to be the drain plug. I'm pretty sure that the proper way to drain that transmission is to remove the pickup screen housing on the left side down low, as you are supposed to clean that screen every time that you change the fluid. Do you have an Operator's Manual? That will have the proper procedure for draining and filling the transmission fluid, as well as cleaning the pickup screen and changing the internal filter.

Sean, the proper procedure for removal of that plug is to screw a 1/4 -20 cap screw into the hole and pull on it to slip the plug out. More pull is needed after years of not being pulled.

Are you saying that is the recommended plug to remove to drain the transmission when you change the fluid?


Sean, I wasn't referring to which plug is the correct to use as a drain. I don't remember for sure, but I believe that I used the one on the bottom. I was responding to the OP's reference to the broken off bolt, as we know that the hole is there to thread a bolt into in order to pull that particular plug out.
 
Not all of the early SOS transmissions had a belly plug. Some only were drainable by removing the inlet screen assembly.
 
(quoted from post at 13:08:59 06/01/19) Not all of the early SOS transmissions had a belly plug. Some only were drainable by removing the inlet screen assembly.

Correct Larry, I thought of mentioning that in my earlier post but I am not a very good keyboarder. It is my understanding that the original overrunning SOSs had no plug in the bottom.
 

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