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Why does it make noise?

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kenojoe

07-16-2005 04:33:37

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I just got a used Case/IH 485. The clutch makes a little rumbling noise in neutral. If I push the clutch down 1/4" it stops. What causes the noise? What do I need to do to fix it?

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Mac

07-17-2005 06:19:29

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Re: Why does it make noise? in reply to kenojoe, 07-16-2005 04:33:37

Sorry John, as former owner of a constant mesh TO bearing, I agree with Joe to a point.There's a teflon thingamajig spacer to protect TO bearing on some of these 85series(IH74/84 kin, not Case) that wears out. Check your pedal height spec in manual(there isn't any freeplay in this type setup). It's probable the spacer is gone and TO bearing isn't riding fully on carrier. causing the rumble until clutch is pushed and seats bearing again. It will get to a point where fingers or bearing face will wear out and clutch R&R is needed, even though disc is still good. I went back with freeplay setup where spring holds pedal and TO back like 74series so I get full usage of disc.

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Joe (Wa)

07-16-2005 10:51:13

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Re: Why does it make noise? in reply to kenojoe, 07-16-2005 04:33:37

The older Case number series (300, 400, 500, etc) tractors had a spring on the driven shaft that holds the throwout bearing in tension against the pressure plate levers (fingers). The bearing race is notched or has a roll pin that contacts the side of a lever and makes the bearing rotate all the time the flywheel is turning per design.

The spring can be weak/broken or the notch/roll pin can wear down and slip over the pressure plate levers making a noise (my 300) that is dampened by forcing the the bearing race up against the levers.

The throwout bearing race/balls can be worn and rough producing a noise that changes pitch as the bearing rpm is forced into synch with the flywheel rpm.

Joe

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txgrn

07-16-2005 06:09:56

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Re: Why does it make noise? in reply to kenojoe, 07-16-2005 04:33:37

Called a throwout bearing or clutch release bearing. It's the bearing that pushes against the clutch fingers when you push in the clutch pedal and want to disengage the tranny.

The rumbling is dry worn balls rolling (rumbling) around in the bearing races. Will just get worse and could cause bigger problems if let to where it just flies apart. Could get caught between a spinning clutch and fixed bearing release lever and tear up something.

Takes a housing split; otherwise easy to fix and not expensive.

Mark

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john in la

07-16-2005 07:19:57

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Re: Why does it make noise? in reply to txgrn, 07-16-2005 06:09:56

Now Now Mark.
Think about what he said. When you push it down 1/4" the noise STOPS.
A throw out bearing would not make any noise at rest and then when you pushed down 1/4" and made contact the bearing would start spinning and START making a noise.

Sounds more like loose pressure plate fingers or springs to me. When you push down the bearing makes contact with the fingers and stops them from rattling.
Either way tractor needs to be split so you can change the clutch out.

Now if you had said the noise stops when you push way down on the clutch I would then think trans input shaft bearing.

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txgrn

07-16-2005 13:42:00

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Re: Why does it make noise? in reply to john in la, 07-16-2005 07:19:57

Now John, we could debate the issue. Since I was in my teens, when the clutch is out..er ah ..or was it when it is in.

John darnet you're right. The balls float till you push on it then when the pressure is on it from the clutch springs, cause the rear isn't turning and the front is.... if it rattles, the balls are dry and worn out.....Dammmmm n I got that backwards.

See that's age for you ..... you just remember enough to get yourself in trouble.

Hope the guy didn't read my reply.

Thanks for being nice about it John. Grin. LOL

Mark

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