The track adjuster of track loaders and excavators are basically a hydraulic cylinder that is extended with grease instead of oil , the fitting that screws into it is a 10,000 psi grease fitting which is easily 2 1/2 the size of and ordinary 1/8 inch grease fitting , it's a big piece of metal , larger than most all bullets that I have seen , the pressure it is under I would guess to be at least 3000 or more , I have seen people get spalatter with the grease and have it pushed under their skin and leave marks for very long time but have never seen this happen before