BRIAN, on top of the spring there is a grease zerk, near the zerk is a relief valve on some models, when you want to release the grease pressure loosen the relief,if the one you have does not have one it is built into the the grease zerk. Take the zerk out look at the threads if there is a cut in the threads it is built in. Where is the grease leaking from,tighten the zerk pump full of grease put a block in the track back up, where is the leak in the spring our by the zerk, troll