Bobcat 500 fuel and oil filler locations

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jimmyg

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Jan 7, 2008
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I just bought an older Bobcat M500 to do a few odd jobs on my property, the person I bought it from said the gas filler was on the left and the hydro oil fill was on the right looking at the rear of the machine. I filled the gas and then the oil with 2 gallons of hydrolic oil and after about 15 minutes of running the engine started to smoke and loose power so it will not stay running anymore. At this point I'm thinking that both sides are for fuel, they both look the same but have no markings on them. I assume the oil filler is elsewhere, does anyone know for sure? The machine ran great for 3 hours prior to this.
 
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jimmyg

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Does it smell like gas under both filler caps
Sorry, not familar with this model
Ken
It smells like gas, not as strong as the left side, my guess is that the previous owner had it for a very short time and only added a quart of oil to the right side so it mixed with the gas and ran fine. I guess I can remove the fuel from the tanks and only fill the left side, if I'm right it should level out to both tanks but it would be nice to know for sure.
 

jerry

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It smells like gas, not as strong as the left side, my guess is that the previous owner had it for a very short time and only added a quart of oil to the right side so it mixed with the gas and ran fine. I guess I can remove the fuel from the tanks and only fill the left side, if I'm right it should level out to both tanks but it would be nice to know for sure.
When you added the hydraulic oil how did you determine the level? If you used the two 1/8 pipe fittings toward the front on the left side chain case then you put the oil in the right one, one is for high lever and the other is low so it should be in between. The gas tanks are interconnected in the frame so only fill on the left. There are tank drains on the bottom rear of the chain cases for both gas and oil.
 
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jimmyg

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When you added the hydraulic oil how did you determine the level? If you used the two 1/8 pipe fittings toward the front on the left side chain case then you put the oil in the right one, one is for high lever and the other is low so it should be in between. The gas tanks are interconnected in the frame so only fill on the left. There are tank drains on the bottom rear of the chain cases for both gas and oil.
Thanks - that's what I needed, it would appear that I have a fuel filler on top of each side on the rear of the Bobcat.
 

jerry

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Thanks - that's what I needed, it would appear that I have a fuel filler on top of each side on the rear of the Bobcat.
Sorry about that jimmieg, I meant to say if you added oil and brought the level up according to those two oil check holes that you used the correct filler for the oil. Which I believe is 3/4 inch pipe fitting on top of the chain case I don't remember which side.
 
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jimmyg

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Sorry about that jimmieg, I meant to say if you added oil and brought the level up according to those two oil check holes that you used the correct filler for the oil. Which I believe is 3/4 inch pipe fitting on top of the chain case I don't remember which side.
Thanks for the info Jerry, I drained the left tank and as suspected the right tank also was drained. After fresh fuel it ran great again. I checked the sides, mine has the two plugs on the left side and none on the right. Does the hydrolic pump and drive system share the same oil? I'm also guessing that both sides must have a pass-through the frame for the oil and can be filled only on one side. Each side does have a 1/2 inch plug/breather on the top which I could fill through.
 

jerry

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Thanks for the info Jerry, I drained the left tank and as suspected the right tank also was drained. After fresh fuel it ran great again. I checked the sides, mine has the two plugs on the left side and none on the right. Does the hydrolic pump and drive system share the same oil? I'm also guessing that both sides must have a pass-through the frame for the oil and can be filled only on one side. Each side does have a 1/2 inch plug/breather on the top which I could fill through.
Jimmyg, they do share the same oil tank, the filter housing on the 610 with the wisconsin engine is down underneath the machine about 4 inch dia and maybe a foot long. The filters from bobcat have holes all over the outside and some of the other brands do not. I think you get better oil flow with more holes.
 
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