Oil change on a 743

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skippyman

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Apr 23, 2007
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I have a 743 that I need to do an oil change on. I have a service manual but I can't for the life of me find the oil drain plug. There is what looks like a hydraulic hose coming out of the lower part of the engine (side facing me when I open the engine cover). Is this the oil drain?
You help is appreciated. Thanks
 

skidsteer.ca

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Jan 20, 2006
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All the newer loaders with the sideways motors have a hyd hose with a cap on the end to drain the engine oil (751 753 etc) so its likely the same on the 743.
Ken
 

Tazza

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Yes, that's the engine oil drain hose.
As Luthor said, that is the engine oil drain hose.
Warm the engine up before you drop the oil, it gets any metal particles that are in there moving around so they will leave the engine with the oil.
Changing the hydraulic oil is a little harder. Other users have removed the hose that goes to the mail hydraulic filter and drained it that way.
The chain case you have to remove a cover and drain the oil with a transfer pump, there is no drain plug for this on a 743.
Any questions just yell.
 

steveb

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Aug 20, 2007
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Hello, I'm new to the forum and just purchased a used 1986 or 1988 Bobcat 743 with 36 hp Kubota diesel engine that is'nt mounted sideways I also have searched the service manual for the oil drain plug and cant find it any help would be greatly appreciated. Thanks Steve
 

Tazza

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Hello, I'm new to the forum and just purchased a used 1986 or 1988 Bobcat 743 with 36 hp Kubota diesel engine that is'nt mounted sideways I also have searched the service manual for the oil drain plug and cant find it any help would be greatly appreciated. Thanks Steve
If you are referring to engine oil, there will be either a hose connected to the sump or a plug on the sump.
Hydraulic oil isn't so easy. I found the easiest way to drop the hydraulic oil is to use your aux hydraulic couplers to get as mush oil out as possible. Open a line and direct it to a bucket, start the machine and run it at idle. Activate the aux hydraulics and drain as much oil as you can. It will start to howl, at this point stop the engine and re-fill the tank with oil and replace the filter. Others have said to remove the hose from the hydro filter and let it drain, i have never found this to work for me, i'm not sure why.
 
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