743 changing lift arm hydraulic line

[fyredetcv]

Ok anyone know the procedure to change a hydraulic line (left) inside the rear lift arm, looks like it can be quite a job (found it getting ready to go) looks as though it rubs on the inner hinge point of the lift arm. can this hose be done in metal jacket or something to prevent from happening again ? also have some drift down in bucket should i possible have cylindars checked also ? Is there anything else that shoud be checked or replaced while i am doing this or should all these hoses be replaced at this time when it apart ? thanks as always for any help.

 

[Tazza]

Pretty simple. I use a block of wood and place it between the chain case and the spot of the lift arms where it touches the chain case, flat plate. Lower the arms till it rests on the wood, this will give you clearance to remove the lift ram. Remove the pins, remove the hoses inside the machine where they attach to the metal tube lines. remove the ram with hoses connected, replace the hose(s) and reverse the procedure.
The drift could be leaky piston seals, it could also be your load checks in the control block.

 

[fyredetcv]

Pretty simple. I use a block of wood and place it between the chain case and the spot of the lift arms where it touches the chain case, flat plate. Lower the arms till it rests on the wood, this will give you clearance to remove the lift ram. Remove the pins, remove the hoses inside the machine where they attach to the metal tube lines. remove the ram with hoses connected, replace the hose(s) and reverse the procedure.
The drift could be leaky piston seals, it could also be your load checks in the control block.

Thanks, now that I hear your description that makes sense. I probably just neede to break down and get a maint and parts manuel for it. Hopefully it will have alot of pictures and not too many big words, lol. Anyway thanks again

 

[Tazza]

Thanks, now that I hear your description that makes sense. I probably just neede to break down and get a maint and parts manuel for it. Hopefully it will have alot of pictures and not too many big words, lol. Anyway thanks again

You can download a manual at: http://www.mediafire.com/?sharekey=31fe914bdce0f59019747bd91027d4ddf46528a8107c8e29
OldMachinist was kind enough to upload a bunch of them for us.

 

[Chipperhead]

Greetings all: When I changed those lines on my 743 it seems the hardest part of the job was the actual wrenching. Large connectors in a confined area. I eventually got it done though. It did require some %$*@# though. When I put the new hoses on I wrapped them both in that thick spiral plastic tubing. I don't know what it is called but I suspect your hydraulic shop man will have it or something similar. Then, when I had to replace the steel line running to the accessory connectors, I just took the original to the shop and asked them to duplicate it. The tech got it close, but not exact. It took a bit more tweaking than I thought it would to install it. My main concern while fitting it in was not to kink it. At a couple of spots where it runs close to the arm or the second line I fit short lengths of heater hose over it. I just didn't think of the spiral plastic wrap while at the hydro shop. The benefit of the spiral wrap is that it can be easily applied between connectors or fittings. If I had that part to do over again I would at least price the tube from Bobbcat. Good day to you, Marty

 

[Tazza]

Greetings all: When I changed those lines on my 743 it seems the hardest part of the job was the actual wrenching. Large connectors in a confined area. I eventually got it done though. It did require some %$*@# though. When I put the new hoses on I wrapped them both in that thick spiral plastic tubing. I don't know what it is called but I suspect your hydraulic shop man will have it or something similar. Then, when I had to replace the steel line running to the accessory connectors, I just took the original to the shop and asked them to duplicate it. The tech got it close, but not exact. It took a bit more tweaking than I thought it would to install it. My main concern while fitting it in was not to kink it. At a couple of spots where it runs close to the arm or the second line I fit short lengths of heater hose over it. I just didn't think of the spiral plastic wrap while at the hydro shop. The benefit of the spiral wrap is that it can be easily applied between connectors or fittings. If I had that part to do over again I would at least price the tube from Bobbcat. Good day to you, Marty

Over here they call it pigs tail. Its heavy plastic spiral wrap.