843 fluid leak

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BobcatMatt

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Apr 19, 2007
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I noticed the other day that right under the "transmission" (the piece the u-joint locks onto) There is fluid underneath it. There are some steel tubes running under it but they do not seem to be rubbing. bad seal? any ideas?
 

Tazza

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It could be a seal, but it could be a leaking hose or fitting. I' give it a good clean first and see if its really coming from the shaft seal on the pump.
 

Fishfiles

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Feb 8, 2007
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I seem to rememeber the 43 series was bad for for leaks in those tubes you talked of that run from side to side right between the motor and pump , there is about 4 of them and they rub together or against the frame , you have to take the motor out to get some of them in and out , the easy way would be to route a hydraulic hose in place of the tubing once you figure out if that is it and which one , the thing to do like Tazza said is a real good cleaning so that you can see where it's coming from , the pump seal is kinda rare to see go out , it may also be leaking from one of the fitting orings on the side of the sunstrand and leaking down the side to the bottom and fooling you
 

Tazza

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I seem to rememeber the 43 series was bad for for leaks in those tubes you talked of that run from side to side right between the motor and pump , there is about 4 of them and they rub together or against the frame , you have to take the motor out to get some of them in and out , the easy way would be to route a hydraulic hose in place of the tubing once you figure out if that is it and which one , the thing to do like Tazza said is a real good cleaning so that you can see where it's coming from , the pump seal is kinda rare to see go out , it may also be leaking from one of the fitting orings on the side of the sunstrand and leaking down the side to the bottom and fooling you
I agree with Fishfiles there, the tube lines on my 743 that i re-built has rather worn lines from vibration. I looked every line over and using the oxy set i brazed over any worn patches. Then wire buffed them all down and painted them.
Where they are is a nightmare if you get a leak, you can't simply pull one out, you may need to remove 3 or 4 to gain access to the one you need, they are all tangled together.
 

BobcatMatt

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Apr 19, 2007
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I agree with Fishfiles there, the tube lines on my 743 that i re-built has rather worn lines from vibration. I looked every line over and using the oxy set i brazed over any worn patches. Then wire buffed them all down and painted them.
Where they are is a nightmare if you get a leak, you can't simply pull one out, you may need to remove 3 or 4 to gain access to the one you need, they are all tangled together.
well its not the lines. What else could it be ? A transmission seal?
 

Fishfiles

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Feb 8, 2007
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well its not the lines. What else could it be ? A transmission seal?
What I would do is pressure wash the inside the machine really good , paying close attention to all the nooks and creaves , this is an important step , cause it is easier to find where the oil is coming from when it's clean , jack and block all 4 wheels of machine off the ground , put the boom in the air and install the safty bar , lift the cab and start machine up , work the functions one at a time , the boom can be raised and lowered a couple of inches with the safty bar in place , work the tilt , aux and both travel levers , on the boom , tilt and aux you may have to work each curcuit to the limit so that relief kicks in at full throttle good luck
 
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