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D2 pony motor balancer

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6 years 5 months ago #188895 by Hal
D2 pony motor balancer was created by Hal
I have been trying to remove the balancer from the crank on my pony motor and the pullers slipped off taking a chunk of the balancer with it. The chunk is maybe 3/8” square and at the deepest 1/16”. Will this throw it too far out of balance and ruin bearings etc ?
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6 years 5 months ago #188897 by neil
Replied by neil on topic D2 pony motor balancer
Doesn't seem like much but to compensate, just grind about the same amount of material from the opposite side and you'll be golden. To remove the flywheel, get one of those cheap 10t hydraulic pullers from Harbor Freight and a couple of bolts and heavy washers from Fastenal. Apply the pressure on the puller and then tap on the circumference of the flywheel and it'll pop off. Leave the nut on about 1- 1 1/2 turns from tight so the flywheel doesn't take off

Cheers,
Neil

Pittsford, NY

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6 years 5 months ago #188898 by Hal
Replied by Hal on topic D2 pony motor balancer
Thanks for the advice Neil ! Glad to hear it’s not ruined!

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6 years 5 months ago #188903 by STEPHEN
Replied by STEPHEN on topic D2 pony motor balancer
The hub has tapped holes to pull it

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6 years 5 months ago #188904 by dpendzic
Replied by dpendzic on topic D2 pony motor balancer
there has been a lot of posts on here advising us to never pull on the flanges---I think OM even posted a puller he designed to pull the hub off

D2, D3, D4, D6, 941B, Cat 15
Hancock Ma and Moriches NY

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6 years 5 months ago #188905 by neil
Replied by neil on topic D2 pony motor balancer
You just need a regular two-bolt puller. Hydraulic enables you to ramp up the pressure before you tap

Cheers,
Neil

Pittsford, NY

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6 years 5 months ago #188906 by TOGNOT
Replied by TOGNOT on topic D2 pony motor balancer
I made such a puller.... Two long bolts ( about 12" or so) that thread into the balancer. At the "head" end of the bolt a pieces of 1" thick steel about 8" x 2". 2 holes in that plate match the distance between the holes in the balancer. Place a hydraulic Jack ( that will work on its side - some won't ) between the plate and the pony shaft.

On a D6 I did this and had to use a cheater bar on the hydraulic Jack. I covered the entire assembly with a heavy tarp, expecting shrapnel to fly or the Jack to blow. There was a loud bang, but the balancer popped off.

I posted pictures in an old post about this....

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6 years 5 months ago #188910 by Dozerman51
Replied by Dozerman51 on topic D2 pony motor balancer
What is a “Balancer? I’ve always called it a “Flywheel” and so does Cat. :confused2

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6 years 5 months ago #188923 by dpendzic
Replied by dpendzic on topic D2 pony motor balancer
I guess balancer comes from a harmonic balancer that drives fan belts on an engine?? :confused2:

D2, D3, D4, D6, 941B, Cat 15
Hancock Ma and Moriches NY

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6 years 5 months ago #188925 by neil
Replied by neil on topic D2 pony motor balancer
Hal, it looks like a balancer with that meaty flange but it's just solid cast iron and serves as a flywheel. On models with electric pony start, there's a belt groove machined into that flange so it's a bit thinner.

Cheers,
Neil

Pittsford, NY

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