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Case skid steer - horrible groaning noise from pumps/motors
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<blockquote data-quote="tedf" data-source="post: 2426" data-attributes="member: 340"><p>Sorry for intrusion into "Bobcat-land"- this is quest on hyd, so i though i'd throw it into the Bobcat forum too.. since it seems to get all the action (compared to 3 posts in Case forum).</p><p>i get a horrible groaning noise on my 1845 (yes 1845 not the 1845C .. its early production 1845) when i move control levers fwd or rev. i keep the throttle at half throttle or more, but still get this. Seems better/less noise and groaning at full throttle... or maybe the diesel engine is just drowning out the noise. The loader hyd system seem fine.... i just repacked the cylinders and bleed the lines.</p><p>i'm wondering if its air in the motors/pumps??... or i'm using the wrong hyd fluid??</p><p>i've replaced the filters (several times).. both the main hyd filter and the charge filter (under the seat).. and changed the fluid (cycled through quite a bit of fluid also from burst hoses). i bought the machine without much/any history from previous owner.</p><p>The manual states Case TCH hyd fluid... does this have something "extra" in it? i bought this expensive stuff ($30 for green 5 gal bucket at Autozone) that states "For use by: .... " and JI Case is listed. A few times i put just tractor R&O hyd oil in ($15 for 5 gals "cheap" stuff) during some of the burst hose incidents... would this cause the groaning? like TCH has anti-foaming and R&O doesn't???</p><p>the machine moves, and has power.... but i don't think it sounds right (ie not just the normal hyd pumps and motors - like my neighbor's Bobcat). This noise is deafening (i wear hearing protectors). Fluid looks normal, not burnt smelling, or milky.. hard to tell on the foam (since the tank is a real pain to fill or look in and sight glass is in poor condition).</p><p>i have the manual, and have been troubleshooting this for past few years...most of elec is gone.. so no idea on charge circuit filter warning "idiot light" - and i can't find anywhere the pressure this is suppose to be (if i inserted a pressure gauge). Machine operates fine, so may be within working limits.</p><p>Can anyone narrow down/provide insite on any of these it might be:</p><ul> <li data-xf-list-type="ul">One option is air leak on intake lines... i can't tell on this...how do i check?</li> <li data-xf-list-type="ul">Improper oil ... manual states only Case TCH fluid.</li> <li data-xf-list-type="ul">Need to drain fluid from motors and pumps and refill (contaminated??) - i only drained the tank, and not the entire system... althought burst lines sorta flushed these..</li> <li data-xf-list-type="ul">Relief valves "cavitating" ?? i see "relief valve cartridges" in the manual, is that a filter/screen?</li> <li data-xf-list-type="ul">Other filters/screens that restrict the flow?</li> <li data-xf-list-type="ul">The motor case drain lines (about 3/8") are old/spongey - need replacing...but don't think that would cause this.</li> <li data-xf-list-type="ul">other things?</li> </ul><p>i really don't want to run it if its tearing something up inside??</p><p>thnx for any help, ted</p></blockquote><p></p>
[QUOTE="tedf, post: 2426, member: 340"] Sorry for intrusion into “Bobcat-land“- this is quest on hyd, so i though i'd throw it into the Bobcat forum too.. since it seems to get all the action (compared to 3 posts in Case forum). i get a horrible groaning noise on my 1845 (yes 1845 not the 1845C .. its early production 1845) when i move control levers fwd or rev. i keep the throttle at half throttle or more, but still get this. Seems better/less noise and groaning at full throttle... or maybe the diesel engine is just drowning out the noise. The loader hyd system seem fine.... i just repacked the cylinders and bleed the lines. i'm wondering if its air in the motors/pumps??... or i'm using the wrong hyd fluid?? i've replaced the filters (several times).. both the main hyd filter and the charge filter (under the seat).. and changed the fluid (cycled through quite a bit of fluid also from burst hoses). i bought the machine without much/any history from previous owner. The manual states Case TCH hyd fluid... does this have something “extra“ in it? i bought this expensive stuff ($30 for green 5 gal bucket at Autozone) that states “For use by: .... “ and JI Case is listed. A few times i put just tractor R&O hyd oil in ($15 for 5 gals “cheap“ stuff) during some of the burst hose incidents... would this cause the groaning? like TCH has anti-foaming and R&O doesn't??? the machine moves, and has power.... but i don't think it sounds right (ie not just the normal hyd pumps and motors - like my neighbor's Bobcat). This noise is deafening (i wear hearing protectors). Fluid looks normal, not burnt smelling, or milky.. hard to tell on the foam (since the tank is a real pain to fill or look in and sight glass is in poor condition). i have the manual, and have been troubleshooting this for past few years...most of elec is gone.. so no idea on charge circuit filter warning “idiot light” - and i can't find anywhere the pressure this is suppose to be (if i inserted a pressure gauge). Machine operates fine, so may be within working limits. Can anyone narrow down/provide insite on any of these it might be: [LIST] [*]One option is air leak on intake lines... i can't tell on this...how do i check? [*]Improper oil ... manual states only Case TCH fluid. [*]Need to drain fluid from motors and pumps and refill (contaminated??) - i only drained the tank, and not the entire system... althought burst lines sorta flushed these.. [*]Relief valves “cavitating“ ?? i see “relief valve cartridges“ in the manual, is that a filter/screen? [*]Other filters/screens that restrict the flow? [*]The motor case drain lines (about 3/8“) are old/spongey - need replacing...but don't think that would cause this. [*]other things? [/LIST] i really don't want to run it if its tearing something up inside?? thnx for any help, ted [/QUOTE]
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