is there some kind of add on crankshaft extension

Andy479 · Mar 8, 2015

I am attempting to get a small backhoe with bucket up and running. It originally had a 20hp Kohler horiz shaft. I purchased a predator 22hp but the muffler location is in the way of mounting. So I'm wondering if there is a crankshaft extension part that would work?

markct · Mar 8, 2015

I would be modifying the exhaust before I played with the crankshaft. Any extension is going to put added strain on the crank, maybe not a big issue tho if its just driving a hyd pump etc, but if its belt or chain drive off the side that could definatly damage the crank over time. Exhaust is pretty easy to play with usualy, I have made some pretty crazy manifolds from pipe or square tube to fit engines, small and large, into odd equipment.

Steve@Advance · Mar 8, 2015

Don't know of anything available as a stocked
part. You could have something made at a machine
shop, but would be expensive.

Extending a crankshaft is risky. High RPM, high
torque, everything needs to be true and right for
it to work without beating itself loose.

Modifying or moving the muffler would be the best
solution if at all possible.

Could you post some pictures?

Bob · Mar 8, 2015

Am I right in speculating that "Predator" = Harbor Freight"?

88-1175 · Mar 8, 2015

lovejoy coupler and 2 pillow block bearings

NCWayne · Mar 9, 2015

Having done quite a bit of 'make it fit' jobs for myself and others, I've got to agree with those that say modify the exhaust. I'd do that long before I'd try anything else.

Traditional Farmer · Mar 9, 2015

If your shaft is keyed go to Surplus Center they have have couplings that you can couple your shaft to another piece of shaft to get the length you need.They also have various splined couplers too.

Andy479 · Mar 9, 2015

Sorry my original message made no sense, I left out a complete sentence. Here it is again

I am attempting to get a small backhoe with bucket up and running. It originally had a 20hp Kohler horiz shaft. I purchased a predator 22hp but the muffler location is in the way of mounting. [u:cfc35f2a6d]Now my shaft will not reach my coupler[/u:cfc35f2a6d]. So I'm wondering if there is a crankshaft extension part that would work?

Andy479 · Mar 9, 2015

Thanks to all for your reply. I guess a modified muffler would be the best route. It is driving a Hydraulic pump via magnaloy coupler. I thought if there was such a thing, something to extend my shaft reach would be easiest route.

Russ from MN · Mar 9, 2015

Rex Omega spacer coupling, commonly used on back
pull-out pumps. I installed many of them,
available with taper-loc adapters, very reliable
driveline components.

http://www.rexnord.com/sites/Process/TechLibrary/L
iteratureLibrary/4000_Omega%20Elastomeric%20Coupli
ngs_Catalog.pdf

smallercrawler · Mar 9, 2015

Terramite T5C? If so, engine will need to be installed fan side toward transmission to accomplish correct pump input rotation direction. In this case you will need to make or buy an adapter to take power off the engine non PTO side. Adapter generally uses fan mounting bolts on a flange and then terminates in a short shaft to pickup the coupler half. Cut fan screen to fit after adapter is installed. Exhaust will then be to front of tractor. Have made several for various engine swaps in specified machine, only trick is to keep adapter as concentric as possible with engine shaft.
If not a Terramite, please disregard.

Andy479 · Mar 9, 2015

My shaft is keyed, I am driving a Hyd pump, and it looks like surplus center has a keyed coupler and 1" keyed shaft material. Would you guys go this route or change exhaust?

Andy479 · Mar 9, 2015

How critical is alignment with this component?

Russ from MN · Mar 9, 2015

Perfect is best! + or - .002 ofset and angular
should run a long time if it's sized right. I'm
not sure how well they work on engines because
of the power pulses. Maybe someone else will
have some experience. I always installed them
on electric motors, where they were expected to
run steady for 5 years. The best thing about
them is you could change the elements in about
10 minutes! I used to inspect them on the run
with a strobe light, when small cracks would
show up it was time to schedule a change.

Andy479 · Mar 9, 2015

Thanks Russ, I appreciate the feedback

is there some kind of add on crankshaft extension

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