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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Caterpillar 951

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fatbob50

11-17-2007 14:59:35




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I have a 951 Trac Loader Caterpillar. There are some rubber cushions that go between the motor and the transmission. They went out on me a couple of weeks ago, and I replaced them. I ran it less than 3 hours and the new ones broke also. The transmission can be turned by hand when I am under there and the motor was rebuilt not long ago and runs good. Some people have referred to these as biscuits, but I am not sure what the correct name for them is. They are about 5 inches in diameter and about 2 inches thick. There are 4 of them that go between the motor and the transmission. Any help would be appreciated. Has anyone run into this before? Thanks, Bob

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fatbob50

11-18-2007 19:09:21




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 Re: Caterpillar 951 in reply to fatbob50, 11-17-2007 14:59:35  
The link came through this time, I am sure this will help. Thank you for sending it. Regards, Bob



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AJ.

11-18-2007 06:26:39




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 Re: Caterpillar 951 in reply to fatbob50, 11-17-2007 14:59:35  
Here"s a tip used at my place for getting the engine back within a hairs width of where it was originally,clean around the four mountimg points,get a can of areosol black paint and spray each of the mounting joints,keep the shims together for each mounting point,put the correct shims back where they were when reinstalling the engine and match the paint you sprayed on,put a dial gauge on the torque input shaft and check the runout as in the picture below and all you have to do is the fine alignment.
AJ

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AJ.

11-18-2007 14:33:33




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 Re: Caterpillar 951 in reply to AJ., 11-18-2007 06:26:39  
Sorry I put the picture on a video hosting site,try the link below.
AJ



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fatbob50

11-17-2007 20:22:27




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 Re: Caterpillar 951 in reply to fatbob50, 11-17-2007 14:59:35  
I would like to thank all of you that replied to this post. I understand exactly what you are saying and what needs to be done. I did not realize that these flex joints (biscuits) had to be lined up and that how they are placed was critical.

Thank you again for your answers, Bob



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bob plumadore

11-17-2007 18:52:12




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 Re: Caterpillar 951 in reply to fatbob50, 11-17-2007 14:59:35  
I will send you the line up infor tomorrow. it is a touchy procedure. I will scann it from the service manual. You can break you crankshaft or tear up the Torque Converter if it is bad outof line and you install new flex couplings.



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JCSinGA

11-17-2007 18:29:25




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 Re: Caterpillar 951 in reply to fatbob50, 11-17-2007 14:59:35  
When you say "the motor was rebuilt not long ago" most likely there lies your problem.

Caterpillar's and those "biscuits" are very particular in engine to transmission angle and line-up. There not able to give and flex near as much as a universal joint.

Bob/Ont would be the in-house guru on this subject, come to think of it you may be able to search the archives as it has been discussed here before.

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Bob/Ont

11-17-2007 19:32:43




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 Re: Caterpillar 951 in reply to JCSinGA, 11-17-2007 18:29:25  
"There In Lies Your Problem"
Got that one right straight off JCS. If you don't have the alignment right you get what Bob's Got.
Now Bob, you need a Dial Indicator and a piece of rod to clamp it to bent in 90 deg. Grind one end down to a Vee shape to fit nice in the spline of the trans input shaft and clamp it there with a hose clamp. Clean off the Outer Diameter and the outer face of the drive flange on the engine with emery cloth or sand paper. You then need to first spin the dial indicator around the OD of the flange. You need to be careful at the notches, run up to them lift the pointer and let it back down when you are over the notch. Need a light and mirror to follow needle of indicator.
What you are doing here is measuring the OFF CENTER of the shafts. Side to Side and Up and Down. I should also point out that the rear engine mounts need to be welded solid to the frame and nice and flat on top. The blocks mounted to the flywheel housing should also have a nice flat surface. That achieved write down the # you get at 12:00 O Clock, 3:00 O Clock 6:00 O Clock and 9:00 O Clock. Making sure the indicator didn't spin the needle more than one turn, if it did take that into account.You chould be able to buy hardened shims from Cat to adjust engine. Take the diff in reading from 12:00 O Clock and 6:00 O Clock and divide by 2. That is the thickness of shims you need to put under each side of the rear engine mounts. Install shims, and spin the dial again with rear mounting bolts loose. Take a pry bar and push the engine side to side untill the readings at 3:00 O Clock and 9:00 O Clock are equal. Tighten rear mounting bolts and spin dial again. If you get a reading of less than 0.080" you are okay but the closer to Zero the better. Now put the indicator on the face of the flange and spin it again, lifting it over any notches and record the readings at the same 4 Clock positions. Calculate the diff from 12:00 O Clock and 6:00 O Clock and Multiply by 3, that is the thickness of shims you must put under each side of front engine mount. Spin dial again and use prybar to move front of engine side to side to make readings at 3:00 and 9:00 O Clock equal. Tighten all mounting bolts and spin dial again. Face runout must bee less than 0.026" then again the closer to zero the better. You may have to do this over and over again to get less than spec run out but do it and you bought your last 4 biscuits.
Later Bob

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