getting outside the box on this 1 i got a case cx330 excavator, which is the .... of the industry alot of parts are made by companies that service cat, deere, link belt, hitachi so forth. 1st thing i noticed is the travel peddle was broken. right hand track doesnt work. top it off swing doesnt work unless pulling back the travel pedles. weak at best. the travel pedal isnt avaible in the us and the 1 in the uk and other in germany case ih wouldnt ship. crossed it to the manufacture, found a indentical 1 to cat. while thats on order i flipthe travel lines over. now right side works full power. run some tests, then both tracks start to work. flip the lines back and right peddle that i got to work temporaly now runs left. this machine has the single peddle option for forward and back. the pedle was bypassed but the valve block wasnt. also was some leakage down here. the cat bolted directly in, no mods needed. being there made by the same company and are univresal with linkbelt even doesnt surprise me. got the travel valve bypassed per factory specs without it. this involves the 4 lines from travel peddles and the 2 from froward and reverse being eliminated and using the 4 main lines. fire it up i got power and swing back. but then lost it. i got very weak power on right track, and the only way the swing works is by either pulling the travel peddles weak at best, along with turning on/off free swing. thought there might have been air still in the system and rechecked. not sure if i should do a hard purge. i had the dealer for the machine come out to run some hydraulics tests. took a bit as they didnt even want to come out. get here and they dont have the tools for it. so ordered a pressure test kit. i know i got a few pressure releif springs out of adjustment. when its runing for a hour, light use to get up to temp, everything warmed up i start to loose power. acording to the computer i got 4200 psi on startup and its better when warmed up. pilot pressure is showing 33psi, which is .22 mpa and by looking at the charts need 3mpa from pilot pump. not sure if i should bleed pilot pump nor best place to put a gauge to see the pressure its at. theres several diagrahms on this machine just over 4000 pages in all. still missing some data and numbers as the parts book have things like the free swing, where as the manual, services do not. been working on equipment 20+ years not my 1st problem machine, but 1 that is proving to be dificult. if pilot does check out to be weak i will end up replacing it. if i cant get a case pilot will have to track down the source. not sure where else to look. theres also 2 ways to adjust pressure releifs, 1 is to tighten the screw and the other is to shim. both are mentioned. not sure whats best. any information or spec sheets is helpfull. most of what i finding in eu, that has more depth. makes things interesting. will add at randome the machine will surge wil moving boom and stick but pressure is steady. fairly crtain this is a pressure relief problem.
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