how to change bushings in a excavator 

Can u tell me how to minimize cost? Need nitrogen to freze the bush

Place them in your home freezer over night. The same freezer you store your ice cream.

@@PaulEglinton it seem u never work with big mechine..maybe u work with small mechine

@@PaulEglinton that really only works if it’s a .001 inch / .025 mm or so interference. Most excavator bushings I’ve installed are more like .003 to .005 inch interference which generally requires dry ice or liquid nitrogen and heating the bore to allow a slip fit.

@@strangefruit8776 Dry Ice / Acetone bath is - 78C or -172F , I've hammered in a few big bushing's with close to .010" int fit. IMO heating the bore doesn't work well.