630 power steering overfull

fixerupper · May 18, 2019

Is there any way for the power steering on a 630 to get overfull on it s own? I have the local threshing show s 630 in the shop for some clutch work. The bottom part of the grille was dirty oily so I pulled the nose cone and found the oil has been coming out around the fill plug dip stick. The oil in the reservoir was not clear to the top but I did suck out about a pint of oil to get it down to the full mark. The oil was dark and almost smelled like engine oil but my nose might have been tricking me on that. Being at the show grounds it could have been topped off by anyone so maybe it was just overfilled.

Monkeymaster · May 18, 2019

Well,
The drive shaft from the power trowl is suppossed to be dry.
Then there is a seal at the back side of the power steering pump, to keep the power steering fluid
on the power steering side.
IF that seal went bad, and somehow the oil from the power trowl mitigated it's way up to there, it
might have gotten into the system and pumped into the reservoir.
I think that is unlikely, because if the back seal went bad, you would more likely have power
steering fluid running back to the power trowl.
A simple test of loosening the two back bolts that hold the shaft to the power steering pump, to
see if any fluid drains out, will tell you if you have troubles/seal issues.
I am no expert, but I did just rebuild my power steering on my 60, and the old boy who rebuilt it
had mentioned the power trowl shaft running the power steering pump is to be dry.
Good luck

fixerupper · May 18, 2019

I have had a couple power steering pumps apart, not enough to be an expert. I dont see how oil in the fan shaft can get into the pump. The inside of the oil pump is pressurized. If any oil leaks it will come out of the pump and into the fan shaft. The oil I was looking at was dark like used engine oil but when i spilled a little on the work bench it looked like dark tinted oil, not black like used engine oil. The gasket on the oil fill dip stick is curled up like someone cut a gasket out of an inner tube. A new gasket is in order for sure.

Bob · May 18, 2019

"I dont see how oil in the fan shaft can get into the pump. The inside of the oil pump is pressurized."

The shaft seal area is not "pressurized" and is probably ported to the intake side of the pump.

Without going into if there may be engine oil in the fanshaft tube or not, it doesn't matter, if the pump shaft seals are good.

Originally, they had a double-lip seal, now replaced by two single-lip seals butted up against each other, with the lips facing outward.

The inner seal keeps PS oil from leaving the pump, the outer seal prevents any chance of air or engine oil from entering the pump.

fixerupper · May 18, 2019

So there might be a chance of engine oil getting into the pump through the outer seal?

ET · May 19, 2019

The power steering pump seal on the
fanshaft side of the pump is a suction
seal not a pressure seal. Yes it can pull
engine oil into the power steering
system. My 620 did the same thing.

fixerupper · May 19, 2019

Thank you.

Dan in Ohio · May 19, 2019

Power steering system and powr-trol are two separate systems, are they not? The two do not mix.

fixerupper · May 19, 2019

The power steering and Power Trol are completely separate in a row crop tractor. However, the orchard model does not have a separate power steering pump but instead uses the power trol system to power the power steering. The orchard model has a larger hydraulic pump and uses forced engine oil to lubricate the hydraulic pump idler gear instead of the splash system used in the row crop tractor.

What we are talking about with the row crop tractor is whether or not engine oil that has entered the fan shaft housing can get into the power steering pump and evidently it can get into the hydraulic pump and cause an over filled power steering reservoir. It looks to me like this 630 I am working on now will be back in my shop this coming winter to alleviate this problem.

Dan in Ohio · May 19, 2019

We are talking 630, right? No such thing as a 630 orchard unless someone has swapped sheet metal with a 620.

fixerupper · May 19, 2019

Ya, I know there was no 630 orchard, only a 620.

Dan in Ohio · May 19, 2019

fixerupper,

While rereading your post I have been trying to remember what my 70 gas tractor PS was doing when I had to repair the pump. My PS did not work when
I got it home, system was dry. If I remember correctly it seemed as though mine was filling the crank case, hard to recall for sure as I ended up dealing
with a whole range of problems before the PS was working (good enough ) by my standards. Keep in mind the 70 gas std. has has no dip stick to
measure crank case fill level. I also remember the lower part of the radiator seemed wet. So checked radiator fill level, changed and flushed radiator
fluid. Radiator still looks wet to this day. Just know the PS oil went somewhere and as I recall it was going into the crank case.

I just hope your PS pump on the 630 is easier to access than mine was. Parts needed were still available a few years ago and Rich Duane makes the
shafts. Hopefully your repair will go smoother than mine did.

fixerupper · May 19, 2019

I am going to wait till winter when the tractor is not needed and I have the time. It s a time consuming job as you know. As little as this tractor is used the reservoir will not overfill again any soon. By the way this is a sweet 630 in very good shape. There is not a dent in it anywhere.

630 power steering overfull

fixerupper

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Monkeymaster

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Bob

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ET

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Dan in Ohio

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