Hello everyone my name is Jim I am new to the forms I live in Castlerock Colorado I do excavation as a side job I am having problems with my 2012 new Holland L220 I was told my foot control valve quite big and expensive needed to be replaced the valve that raises the boom and lower the boom is having a hard time pushing in and out they told me I had to replace the whole pump I can't rebuild it . My question is can I rebuild that one valve Or even the entire pump ? Well pump manufacture is Walvoil any information you can give me will be greatly appreciated thank you so much