i have started noticing that when i put down the safety lever to turn on the controls in my kobelco 130 that there is a hydraulic whine and it pulls the motor down. everything is functioning properly, all the controls work fine. sounds like a valve is sticking or something, but if that were the case i'd think that a function would be trying to do something... ie the bucket would move on it's own or something. but everything works as it is supposed to. it is worse when the machine is cold, it actually stalls the motor when it is at idol. :beatsme thanks in advance.
It sounds to me like the hydraulic system is being asked to push fluid over relief, when you are engaging the pilot control system (when you push the lever into the operating position). There could be several reasons as to why this is happening and it would probably be much easier to help you if you disclosed the year and model of your Kobelco, and any other symptoms that you may be experiencing. This may help determine what systems you have (particularly pilot and computer) on your particular machine. Good luck.
1998 kobelco sk 130lc mark IV pilot controls
double post? please gauge into the main pump pressure test ports using 6000 psi gauges x 2. the kawasaki pressure test ports are a japanese bspp porting PF 1/4 = 1/4 bspp with o-ring an adaptor can be purchased and a micro-bore test hose Stauff or Parker Stauff # SMK20-G1/4-VB hose = HFF20-# (length) 15 feet gets you into the cab to be able to read easier by yourself without hopping in and out. and pressure gange adaptor you could have a stuck neutral bypass cut spool. i can aid over the phone if you like once you have the two pressure gauges tapped in 905-888-9070 adam
ive had this happen on a jd892dlc also, thanks for the thread.