new to the forum so thanks in advance for any help, i have a 1985 hydra mac 20c that works well when you first start it up but after it warms up in about 10 min it will not turn side to side both forward and reverse, when first started it will spin on a dime. i have changed hydr. filters and fluid but dont know where to go next, the bucket works fine and forward and backward is fine. thank you for any help.