2008 CAT 980H
Serial number: JMS4046
Hrs: 21000
I’m having a tilt drift issue on a heavy load. Tilt cylinders have been repacked a few months ago. Pulled hose off of rod end. tilt would drift no oil came out of hoses. So safe to say cylinders are holding oil pressure. Checked pressure to my main valve relief was low around 2200psi. Bumped up to 3050 psi. Still not change. Checked rod and head line relief pressure. Head pressure was 3050psi. Rod relief was 2750. Spec is 2100. Brought down to 2150 psi. Wondering if I should bump back up to 2750psi? Pulled reliefs and check o-rings and for obstruction. Had none. Calibrated all hyd function all passed but still no change. Had another 980H swapped line reliefs and shutter valve no change. I’m going to swap main relief tomorrow and see if there is a change and then calibrate. Now there is a little lift drift not bad. main issue was the tilt. Have not checked ride control or brake accumulator pressures will also do that in the morning. If the problem still occurred I’m thinking the valve body needs replaced. Any help would be greatly appreciated. Thank you
Serial number: JMS4046
Hrs: 21000
I’m having a tilt drift issue on a heavy load. Tilt cylinders have been repacked a few months ago. Pulled hose off of rod end. tilt would drift no oil came out of hoses. So safe to say cylinders are holding oil pressure. Checked pressure to my main valve relief was low around 2200psi. Bumped up to 3050 psi. Still not change. Checked rod and head line relief pressure. Head pressure was 3050psi. Rod relief was 2750. Spec is 2100. Brought down to 2150 psi. Wondering if I should bump back up to 2750psi? Pulled reliefs and check o-rings and for obstruction. Had none. Calibrated all hyd function all passed but still no change. Had another 980H swapped line reliefs and shutter valve no change. I’m going to swap main relief tomorrow and see if there is a change and then calibrate. Now there is a little lift drift not bad. main issue was the tilt. Have not checked ride control or brake accumulator pressures will also do that in the morning. If the problem still occurred I’m thinking the valve body needs replaced. Any help would be greatly appreciated. Thank you