Need a little help. I have a 1030 at the shop which has repeatedly blown rockshaft seals over the last few years. I just replaced the rh seal and was informed that the customer had done a couple himself, and upon removal of the old one the pressure lip was blown right out under the dirt wiper. I know that the bushings are lubed but what could allow that much pressure on the seal, the bushings seem to be tight enough to keep the shaft from moving. Have any of you guys had anything similar, I would like to know that I have covered all the bases before it goes home, a considerable distance from our dealership. Thanks in advance, mEl
- Thread starter mEl
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Anonymous-0
Well-known Member
Hry MeL: I think this is a surprise quiz from the master. My guess would have to be a plugged housing vent, and I believe the only venting it recieves is through the fill cap. If that isn't the problem, is the rockshaft sliding side to side for some reason?
The shaft seems ok and there is no appreciable end play. The vent thing I considered but the dipstick o ring is not that tight even and if the linkage box is open to the trans case which it is then even the boots on the shifters would probably breathe enough to dissipate pressure. As previously stated, the pressure lip was pushed right out under the dirt lip and that should take an extreme amount of pressure. One would think that normal bushing clearances would allow oil to flow to the inside without building excess pressure. keep the ides coming. mEl
mEl, I know you probably already checked this but sometimes when we are so convinced that one thing is happening it turns out to be another.
Since this is happening over and over, did you think of a mechanical displacement of the lip rather that pressure?
If a part, the rockshaft, got through inspection at the plant (or has been damaged over the years) a surface finish that is not quite up to par and exhibits a slight helical surface could actually screw the lip out. After 35 years around oilfield manufacturing shops I have seen a lot of starge things happen during the machining processes and not be caught in inspection as the problems are so small or thought to be insignificant. As we all __it happens.
Might want to check with the owner and ask if the shaft had ever been damaged, weld repaired and remachined. Just a thought.
JGarner
Since this is happening over and over, did you think of a mechanical displacement of the lip rather that pressure?
If a part, the rockshaft, got through inspection at the plant (or has been damaged over the years) a surface finish that is not quite up to par and exhibits a slight helical surface could actually screw the lip out. After 35 years around oilfield manufacturing shops I have seen a lot of starge things happen during the machining processes and not be caught in inspection as the problems are so small or thought to be insignificant. As we all __it happens.
Might want to check with the owner and ask if the shaft had ever been damaged, weld repaired and remachined. Just a thought.
JGarner
Anonymous-0
Well-known Member
In years past we had that problem also.If I remember we found the lube hole under the sensing cover,made a plug to fit it and drilled a small hole to limit the lube oil flow.Sometimes we even pluged the hole where there would be limited 3 point use.
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