930 cat loader has vibration please help me!!!!

Have you checked the timing of the balancer weights driven from the oil pump?

i put in a new oil pump ..it only happen when i rebuilt the engine and it been over a year now i been using the engine with the viberation

If you had the oil pump off the ballancers are out of time. Put engine on TDC 1 or 4, put timing bolt in flywheel. Drop pan and oil pump. Put a 3/8" bolt in each ballancer shaft up through the block to hold them in place while you put the oil pump back up. That will time it.
Later Bob

You won't be the first one to be caught out by not 'timing up the oil pump', the lesson here is, 'what did I do to cause this problem?', before changing loads of other stuff.
That pump may not go back up with all the timing bolts in position, you may have to slacken the left hand one to get the pump up and then re-check that it will go in.

thanks for the help guys im going to do that

Engine balancer instructions on 3304 - 78P engine:

The ballancer shafts turn at twice the speed of the crankshaft. The idler gear driving the oil pump is a hunting gear (the timing marks don't line up every turn).
Therefore you can have any piston at TDC for timing. Use 1 & 4 as the timing bolt hole in the flywheel will line up and lock the crank. As Catsilver said the gears are a challenge to mesh but make sure the ballencer bolts go in when the pump is up. If not drop the pump a bit and make correction. Due to hunting tooth idler the ballancer gear tooth marks may not line up with the other gear tooth marks but the marked teeth on the ballencers will be lined up with their respective drive gears.
Later Bob