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M Hydraulic Pump Coupling

A

Anonymous-0

Well-known Member
Working on an M, and want to disable the hydraulic pump. Took the lower cover off, and see a coupling, but don't see how to uncouple it. Nothing in the service manual, or operators manual. Need a ittle help. Thanks.
 
The M coupler has lugs that fit into slots in the pump and counter shaft flanges. The lugs are offset 90° on the coupler. The coupler slides out as the pump assemble is lowered out of the center section of tractor.
 
(quoted from post at 18:08:00 05/26/11) Can the coupler be disconnected, without removing the pump?
Click to expand...

The short answer is no. You can only half remove the pump and do it. You have to take all the plumbing and the cap off the pump. Then support the bottom of the pump with a floor jack. Then screw 2-4 long (+3") 3/8" bolts in the holes. This will keep everything inline. Lower the pump with the jack and the thing will come out. Jack it back up and you are good to go.
 
All the couplers that I"ve dealt with have a cotter pin thru the coupler and the lug in the middle. All you should have to do is remove the cotter pin and then the center lug will slide out.
 
(quoted from post at 00:10:57 05/28/11) All the couplers that I"ve dealt with have a cotter pin thru the coupler and the lug in the middle. All you should have to do is remove the cotter pin and then the center lug will slide out.
Click to expand...

Must be you have never been into an M
 
(quoted from post at 20:10:57 05/27/11) All the couplers that I"ve dealt with have a cotter pin thru the coupler and the lug in the middle. All you should have to do is remove the cotter pin and then the center lug will slide out.
Click to expand...

H's have a bar with two sliding things with cotter pins locking them on. M's have a disc with opposing driving dogs.
 
(quoted from post at 23:10:57 05/27/11) All the couplers that I"ve dealt with have a cotter pin thru the coupler and the lug in the middle. All you should have to do is remove the cotter pin and then the center lug will slide out.
Click to expand...

I have run across a couple of that style couplers on an M. I think they must be after market couplers.
 
(quoted from post at 14:03:16 05/28/11)
(quoted from post at 23:10:57 05/27/11) All the couplers that I"ve dealt with have a cotter pin thru the coupler and the lug in the middle. All you should have to do is remove the cotter pin and then the center lug will slide out.
Click to expand...

I have run across a couple of that style couplers on an M. I think they must be after marker couplers.
Click to expand...

Owen,

How did they work??? There is no room for any extra pieces that I can see.
 
(quoted from post at 15:51:01 05/28/11)
(quoted from post at 14:03:16 05/28/11)
I have run across a couple of that style couplers on an M. I think they must be after market couplers.
Click to expand...

Owen,

How did they work??? There is no room for any extra pieces that I can see.
Click to expand...

One of the lugs is actually like a piece of key stock. One side of the coupler has a slot instead of the lug sticking out. You slide the coupler up into one of the slots and then line the other one up and slide in the key. There is a hole in the middle of the key to accept a small cotter pin through the coupler and the key. The cotter pin is only about a 3/32 - 1/8 inch diameter rather than the 1/4 inch the the H couplers use.
 
(quoted from post at 18:15:49 05/28/11)
(quoted from post at 15:51:01 05/28/11)
(quoted from post at 14:03:16 05/28/11)
I have run across a couple of that style couplers on an M. I think they must be after market couplers.
Click to expand...

Owen,

How did they work??? There is no room for any extra pieces that I can see.
Click to expand...

One of the lugs is actually like a piece of key stock. One side of the coupler has a slot instead of the lug sticking out. You slide the coupler up into one of the slots and then line the other one up and slide in the key. There is a hole in the middle of the key to accept a small cotter pin through the coupler and the key. The cotter pin is only about a 3/32 - 1/8 inch diameter rather than the 1/4 inch the the H couplers use.
Click to expand...

Thanks
 
Loren, I took the pipes off of the pump and then put a piece of redi rod about 4 inches long in the front hole of the belly pump on one side and the back hole on the other wheree the pump mounts to the tractor. Then with a nut and washer lower it enough to pull the coupling out and draw the pump back up in the tractor. No heavy lifting or spilled oil.
 
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