Farmall 656 Hydraulic Pump

[H+60]

I was wondering if anyone could tell me how much play there should be on the hydraulic pump drive gear. I just replaced the piggyback pump and noticed the main pump drive gear seems to have a lot of play in it. Being a keyed shaft I would think it should be a tight fit. I haven't pulled it off yet to investigate, I was just wondering if this was normal.

 

[Janicholson]

None, it should have a near interference fit on the keys. Jim

 

[H+60]

(quoted from post at 13:51:38 04/07/16) I was wondering if anyone could tell me how much play there should be on the hydraulic pump drive gear. I just replaced the piggyback pump and noticed the main pump drive gear seems to have a lot of play in it. Being a keyed shaft I would think it should be a tight fit. I haven't pulled it off yet to investigate, I was just wondering if this was normal.

ust pulled the gear-looks like I'll be replacing big pump and gear too

 

[Janicholson]

A good machine shop can re pocket the shaft and keyway to the next larger size!! It could be metric and be just fine. Jim

 

[Ted in NE]

The pump gear has a 1/2" bolt that holds it to the shaft. There is a flat washer with a tapered ring behind it. The bolt must have worked loose. Take the cover off where you can see the clutch release brg. There is a big pipe plug on the front of the clutch housing. You will have to drain the trans. oil Remove the plug & tighten the bolt.