Any suggestions on replacing drive motor on Bobcat LT 313 trencher. It leaks and dealer told me it needs new motor which are real expense brand new from Bobcat. Bobcat part # 7116831. Does anyone know of company that rebuilds them or salvage yard that might have used motor.
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SkidRoe
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You could try the Surplus Center:
Surplus Center
Warehouse distributor for many top name manufacturers. Parker Hydraulics, Hypro Pumps, Prince Hydraulics. Direct from the factory. Surplus equipment. We buy large quantities of manufacturer's surplus or excess stock.
www.surpluscenter.com
I found a motor for my LT313 trencher at a good price and when I went to install it I found out the output shaft on new motor was 1.65" diameter and old motor was 1.5" so it doesn't fit. Anyone have any experience with this. The part # are the same and everything else fits. Did Bobcat make changes in the shaft size on newer model? Any chance I could swap shafts? Any help or suggestions would be great.
Thanks
Thanks
I got the LT313 trencher fixed the other day. Turns out the motor was alright. It leaked fluid real bad where sprocket connects to output from pump when trencher was running. The 1st Bobcat dealer said hydraulic motor was bad. Finally brought motor to a independent hydraulic shop they tested it and said motor was fine and it will leak a bit of fluid around shaft when running (part of the design). As it turns out the carrier the pump bolts to and the shaft connects inside of carrier to the output to sprocket of trencher has a high pressure seal that retains this fluid for bearing lubrication in the carrier. That high pressure seal was bad. I replaced high pressure seal, o ring and dust seal in carrier. Trenched a 100' 2' deep trench yesterday in real rocky ground and it worked great no leaks.
The 2nd Bobcat dealer was real helpful in figuring out the high pressure seal and that Bobcat changed the motor in newer trencher that's why the one I bought had a larger diameter shaft. You where right Wayne I should have checked the serial number.
Now I have a new hydraulic motor Bobcat part no. 7116831 (Eaton #161-0088-005) that will fit a newer trencher, angle broom, drop hammer or tiller from Bobcat. If anyone is looking for a new hydraulic motor for these let me know maybe we can figure out if this one will work. Motor new from Bobcat is $3,746.99 I will sell this one for much less then that.
Thanks for everyone's input on this site. It's helped me more then once and I enjoyed reading others posts.
The 2nd Bobcat dealer was real helpful in figuring out the high pressure seal and that Bobcat changed the motor in newer trencher that's why the one I bought had a larger diameter shaft. You where right Wayne I should have checked the serial number.
Now I have a new hydraulic motor Bobcat part no. 7116831 (Eaton #161-0088-005) that will fit a newer trencher, angle broom, drop hammer or tiller from Bobcat. If anyone is looking for a new hydraulic motor for these let me know maybe we can figure out if this one will work. Motor new from Bobcat is $3,746.99 I will sell this one for much less then that.
Thanks for everyone's input on this site. It's helped me more then once and I enjoyed reading others posts.
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Biavahomes
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I'm having similar issues... just put a new roller, chain, and teeth this spring. Buddy selling a new Cat with std teeth and frost teeth for 7500.... I might be interested in the price of your motor... 217-4nine7-2zero73
Hello, I believe I have a similar issue with my LT313. Would you happen to have any additional details on how to get to this high pressure seal as well as a potential part number I can cross reference with my LT313 serial #?
Thank you in advance for any detail you might be able to provide. I have rebuilt a number of hydraulic cylinders on my attachments, but have not had a need to dig into the trencher, so a little green behind the ears on that one.
Hello, I believe I have a similar issue with my LT313. Would you happen to have any additional details on how to get to this high pressure seal as well as a potential part number I can cross reference with my LT313 serial #?
Thank you in advance for any detail you might be able to provide. I have rebuilt a number of hydraulic cylinders on my attachments, but have not had a need to dig into the trencher, so a little green behind the ears on that one.
I've attached the schematic of the LT313 trencher with the parts list. The high pressure seal is #38 (part # 6684673). I also replaced parts 34 (58K160), 35 (743669), 36 (6806562) & 41 (6684675). I was going to replace bearing but after taking it apart the bearing was fine so I returned it. Costs about $135.00 and the trencher works just fine now no leaks. You have to pull the housing (part 39) off the trencher to get to the seal. This required dropping the chain, pulling the sprocket and removing the housing. It wasn't very hard to do. I didn't separate the chain so it was a bit of a challenge to get chain back on the sprocket.
The serial # for my trencher is 045400308. Bobcat changed the pump on newer model and I'm not sure when that was or serial # internal parts might be the same. I have a new pump for the newer model if you are looking for a new pump. This pump also works on a number of other Bobcat attachments (see my post on Nov. 27, 2024).
Hope this helps.
The serial # for my trencher is 045400308. Bobcat changed the pump on newer model and I'm not sure when that was or serial # internal parts might be the same. I have a new pump for the newer model if you are looking for a new pump. This pump also works on a number of other Bobcat attachments (see my post on Nov. 27, 2024).
Hope this helps.
Thank you much for that detail. I managed to get the housing off the trencher and last night disassembled it. Ran into couple challenges with disassembly of the bearing carrier housing. 1st the snap ring #35; Once I got a larger pair of snap ring pliers, I got that off. 2nd challenge was getting the shaft out of the housing. Was not sure if needed a press or not but couple taps with large enough hammer, over round socket on shaft, managed to loosen that free allowing access to all the seals. There were rubber shreds inside the housing which I am assuming were the dust seal as it was not there in one piece.
Similar with your scenario, the bearings appear good so will not replace. Thanks again for your help. Adding some images for reference in case someone else finds them helpful.
Similar with your scenario, the bearings appear good so will not replace. Thanks again for your help. Adding some images for reference in case someone else finds them helpful.
