Hello All. About a week ago I was bush hogging with my IH 300U tractor when I notice I was losing power. I didn't have enough power to start the bush hog from a stand still. I looked at my gages and notice I had significantly dropped in oil pressure. I immediately drove the tractor back to my shop and shut it off. I did not seize the engine, but decided to pull the oil pump and examine it...according to the shop manual. Getting the oil pan off was a task in itself. I'll save that story for another day. I checked compression on each cylinder and got ~155 psi for all of them.
Now I have the oil pump off (se photo). I want to check it out if it is working correctly before I put it back in. There was a .004 thick gasket (#5 fig IH620-s ee photo). The gasket is suppose to be for the end play for the gears according to the manual (para 66A - see photo). I'm a little confuse with the diametral clearance they mention in the shop manual. I heard it for bearings but not for gears. I assume it's a term back in the 1950's that I'm not familiar with. Maybe they mean center distance variation...a more common term used in gear design today. I have no idea.
Anyway, I don't want to put the gear pump back on without somehow testing it first. I thought about making a fixture for it and driving it with my milling machine to test it out. Unfortunately, I have no clue what would constitute an acceptable working oil pump. I guess splattering oil all over my shop would be some kind of evidence the oil pump is working, but not exactly the way I would like to do it. What rpm should I turn it at. I can control it to whatever rpm I need, but then again, how much oil should be pumped out. Are we talking gpm, in^3/min or ft^3/min. There are no specs I can find.
I know I probably have the capability to fix it...even if I have to machine a new gear or part for it. However, my problem is I'm not a mechanic, so I don't know exactly what I should be looking for to fix.
Any help would be greatly appreciated.
Now I have the oil pump off (se photo). I want to check it out if it is working correctly before I put it back in. There was a .004 thick gasket (#5 fig IH620-s ee photo). The gasket is suppose to be for the end play for the gears according to the manual (para 66A - see photo). I'm a little confuse with the diametral clearance they mention in the shop manual. I heard it for bearings but not for gears. I assume it's a term back in the 1950's that I'm not familiar with. Maybe they mean center distance variation...a more common term used in gear design today. I have no idea.
Anyway, I don't want to put the gear pump back on without somehow testing it first. I thought about making a fixture for it and driving it with my milling machine to test it out. Unfortunately, I have no clue what would constitute an acceptable working oil pump. I guess splattering oil all over my shop would be some kind of evidence the oil pump is working, but not exactly the way I would like to do it. What rpm should I turn it at. I can control it to whatever rpm I need, but then again, how much oil should be pumped out. Are we talking gpm, in^3/min or ft^3/min. There are no specs I can find.
I know I probably have the capability to fix it...even if I have to machine a new gear or part for it. However, my problem is I'm not a mechanic, so I don't know exactly what I should be looking for to fix.
Any help would be greatly appreciated.