Bobcat Hydraulic

Will putting regular motor oil into a hydraulic reservior to raise the oil level up to normal hurt anything ?

We have a bobcat skid steer loader on the farm that was built in the mid 70's. Works pretty good for its age and we don't push it hard but it has it's share of leaks mostly at the seals. We were told by a mechanic that works on them that if you didn't have any hydraulic oil on hand you could put W30 motor oil in the reservior to bring it back up to proper level. Thats been a couple of years ago and now motor oil of any viscosity is being put into it. Will this damage any of the system; seals ,pump,valves etc.? The whole system will take about 13 gals. and I'm concerned that when I change the filter and top off with oil its just going to be a waste of oil and filter unless the whole system is flushed out.

Yup. The mechanic just wanted extra work. You will be back with a broken hydraulic system pump. You do that in emergency situations. It is not meant to stay in there. The whole system has to be flushed out and cleaned. that means parts taken apart and washed clean of oil. Brake fluid(hydraulic fluid is not oil). Oil will harden seals and neoprene causing them to leak even more. Also oil is corrosive to flexible hoses and they will crack. Oil will also burn.

Bobcat Hydraulic Motor Repair Service Manual 6570270 3 86 w Revisions to 11 96
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Bobcat Hydraulic Pump Repair Service Manual 6570268 3 86 with Revisions to 1 91
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Bobcat 730 Series Hydraulic Drive Motor Stump Grinder SG60 Attachment
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NEW BOBCAT HYDRAULIC CYLINDER  6675373 HYD GRAPPLE BLADE OTHER TILT TACH
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Bobcat Hydraulic Filter 751 753 763 7753 773 853 863 864 873 883 943 6661248 IL
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BOBCAT 610 SKIDLOADER HYDRAULIC PUMP 6519278
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2 Clark Bobcat Hydraulic Cylinder Seal Kit Part  6509122
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BOBCAT 743B HYDROSTATIC MOTOR HYDRAULIC SKID STEER 6567421
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Bobcat 863 C Hydraulic Filter Head Mount 553 653 751 753 763 773 853 873 953
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Bobcat 863 C Hydrostatic Hydraulic Control Block Valve Skid Steer Skidsteer
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Bobcat Flat face Quick Coupler Hydraulic S130 S150 S160 S175 S185 S205 6680018
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Bobcat Flat face Quick Coupler Hydraulic T140 T180 T190 T200 T250 T300 T320 IL
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Bobcat Hydraulic Cylinders Component Repair Manual 1992 6570091
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admin posted at 2009-12-23 Category: Heavy Equipment