tractormech
Senior Member
Hello all-Any JLG manlift gurus out there? I got a call on a 2004 JLG 400S serial is 0300076034. Customer says that in the summer the oil seems to get really hot and the swing and travel gets real slow to the point that he shuts it down til the next day. In winter it's not as bad but he moves the lift and shuts it off, does his work and then starts up, moves, repeat. I downloaded the manuals from JLG but before I start looking I thought I'd ask if someone has dealt with this issue. Wrong viscosity oil? Maybe a bypassing relief valve heating the oil up? Any ideas, advice of experience would be appreciated. Thanks guys!