SC 252 SWING ARM PIN REMOVAL?

[jaystihl]

I AM TRYING TO REPLACE THE BUSHINGS ON MY SWING ARM PIVOTS(SC 252) AND CANT GET THE PINS OUT THAT ARE UNDER ENGINE. THE 2 THAT ARE BEHIND THE ENGINE I COULD COAX OUT WITH A LITTLE WIGGLING AND A HAMMER BUT THE TWO PINS UNDER ENGINE I CANT SEEM TO GET OUT! WHEN I BOUGHT THE MACHINE THE BUSHINGS HAD ALREADY BEEN WORN OUT. THE TWO BACK PINS SEEMED TO BE REUSABLE WITH JUST A MINIMAL GROOVE WORN INTO PIN. ANYONE HAVE ANY TRICKS THEY USE? ALSO AM TRYING TO REPLACE THE HORIZONTAL PIN UNDER MACHINE, WHICH I HEAR IS HARD TO GET OUT, ANY THOGHTS ON THAT AS WELL,,.....

 

[NCgrinder]

That horizontal (lower) boom pivot pin is a real chore.. I recently totally rebuilt my 252 @2150 hrs .Fortunately ,I was re-powering and had the engine & cutter-wheel/shaft off the boom. All the weight has to be off the pin..I rigged up my engine hoist to lift the boom...its a real delicate balancing act..Theres a large nut on one end and a lock-bolt on the other side...remove the nut and the lockbolt... Be sure to buy a new pivot shaft as you can easily damage the old one ...I wailed on the shaft with every BFH I had, to no avail... I had to torch off the pin & boss on the lockbolt side,as the pin had seized in the boss..(I cut it where the pin boss is welded to the plate)....No amount of heat, or penetrant would break it loose...once I burned off the boss and pin, then I used my air impact hammer on the threaded end and drove the stub towards the side I had just torched off...I machined a new boss and welded it back onto the pivot plates.. I used up two full days and every cussword I knew getting the pin out and replaced...While the pin is out,clean the bore on the center pin bushing , remove the grease fitting & clean out any hardened grease.. Install the pin,lockbolt and tighten the large nut til the pivot plates have a fairly tight clearance ,leave enough room for grease to be pumped between them..... and religiously pump a few squirts of grease in there as you use the machine..
I'm not sure what my local Vermeer shop would have charged,but I'll bet it wouldn't be cheap....Then again,they do this for a living and they might know a few shortcuts...
Good Luck ,if you do it yourself....
Stan