pumping on a grease fitting

Southern Ray · May 8, 2016

Bill VA's post below on un-coupling hydraulic hoses brought a thought to me.
When you go to grease a machine and press the grease fitting to the zerk you get a snap.
When you are finished you can easily pull it off.
But when you pump the grease gun you exert much hydraulic pressure and the fitting stays on - unless the zerk is worn.

I've never worked a milking machine but I've seen the suction cups slipped on and removed quite easily.

Janicholson · May 8, 2016

Assuming you are asking why, it is because the hydraulic pressure pushes outward on the three collet jaws and locks the zerk in until the pressure subsides. Pressures can reach 12,000 psi. Jim

Tom OConnor · May 8, 2016

If you are asking why those milking machines come off easily there are slotted tubes that the rubber teat cups attach to that cut off the vacuum when lifted. If you watch closely when a worker removes the milker from the cow he will lift up and off to the side with the milker. This also breaks the suction seal which holds them on the cow. Don't ever try to pull them straight down or that old cow will promptly remove your hat for you. A young first calf heifer might try to do that on a good day.

jeffcat · May 9, 2016

Yes, and when the stupid thing wears out go buy yourself a real Lincoln end for the gun. They do make a difference.

pumping on a grease fitting

Southern Ray

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Janicholson

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Tom OConnor

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jeffcat

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