Posted 7/19/2018 19:49 (#6880598) Subject: John Deere 9870 ?
I have a new to me John Deere 9870 that has a loud hydraulic whine or hum coming from under the cab around the prodrive area there’s a pump down there by the lift cylinder I think it’s called The proportionator pump is where it’s coming from it doesn’t make a difference if it is moving or not is this normal