Can anyone tell me about these shift accumulators? Iíve just checked them on my 7140 and one is only 10psi and the other is 40psiÖ.I think they are supposed to be over 100psi. The tractor is still shifting ok. The op manual doesnít mention them and I donít have a shop manual for this tractor. Are the accumulators easy to charge, and what pressure should they be?