743B Hydraulic Drive Problem

[bob5hotrod]

I am a first time owner of a Bobcat. I recently purchased a Bobcat 743B (not sure of year) for use around my house. I have a fwd and reverse problem on left side. Thanks to all and Tazza for your forum responses. I swaped motor left to right and the problem followed the motor. I pulled motor apart and found o-rings were shattered under center plastic o-ring and inside o-ring. Inside plastic o-ring had a slit directly across the plastic at a 90 defree angle. I hate to spend $150.00 on a rebuild kit when other rebuild kits are a fraction of that cost. Knowing good and well there is not $5.00 worth of material there. I guess I will have to order that kit. I know that Tazza in a lot earlier post indicated he found o-rings locally for a fraction of the cost. Any input would be greatly appreciated, especially concerning o-ring part numbers and type of o-ring material used in these motors. I think I will get a lot of use from my Bobcat once I get it fixed but just like foreign cars you pay an arm and and leg for the exact same parts for American cars that you would only pay an arm for. Thank you in advance for any feedback to this post.

 

[Tazza]

Are you talking about the O rings under the plastic backup washers? If the plastic Backup washers are not damaged, you just need O rings. Take the samples to your local hydraulic seal shop and they can match them. You are rite, they cost about $5, it gets expensive if the other specific parts are damaged though.
If the backup plastic part is damaged, you will need a kit. Talk to loader parts source, they are cheaper than the dealer.

 

[bob5hotrod]

Are you talking about the O rings under the plastic backup washers? If the plastic Backup washers are not damaged, you just need O rings. Take the samples to your local hydraulic seal shop and they can match them. You are rite, they cost about $5, it gets expensive if the other specific parts are damaged though.
If the backup plastic part is damaged, you will need a kit. Talk to loader parts source, they are cheaper than the dealer.

Tazza, first off, I want to thank you very much for replying to this post and all the other posts you have replyed to where I have recieved a tremendous amount of information concerning my 743B. I have two o-rings in under the plastic backup washers that are crumbled/dissintegrated in maybe 50 pieces. I do have the smallest plastic backup washer that has a slit or a crack across the plastic backup ring. If I had to bet the proverbial farm I would suspect that it is not manufactured that way. Therefore, I will bite the bullit and buy the extremely expensive rebuild kit. However, I will take the o-rings from the kit down to the local o-ring shop first and try get them to sell me matching o-rings in case I am need to replace just the o-rings in the other side sometime in the future. I will keep all appraised of my progress. However, as stated in my first post I still can not understand why this rebuild kit is so expensive (maybe $150.00). Does anyone know where this kit can be purchase at a much cheaper price than than $150.00. As I stated in my intial post, Bobcat parts are like Foreign car parts that are quite a bit more expensive than american car parts. I just dont understand the price difference in rebuild kits in this case. Again, thank you Tazza and all other post repliers. Thank you very much, Bob.

 

[bob5hotrod]

Tazza, first off, I want to thank you very much for replying to this post and all the other posts you have replyed to where I have recieved a tremendous amount of information concerning my 743B. I have two o-rings in under the plastic backup washers that are crumbled/dissintegrated in maybe 50 pieces. I do have the smallest plastic backup washer that has a slit or a crack across the plastic backup ring. If I had to bet the proverbial farm I would suspect that it is not manufactured that way. Therefore, I will bite the bullit and buy the extremely expensive rebuild kit. However, I will take the o-rings from the kit down to the local o-ring shop first and try get them to sell me matching o-rings in case I am need to replace just the o-rings in the other side sometime in the future. I will keep all appraised of my progress. However, as stated in my first post I still can not understand why this rebuild kit is so expensive (maybe $150.00). Does anyone know where this kit can be purchase at a much cheaper price than than $150.00. As I stated in my intial post, Bobcat parts are like Foreign car parts that are quite a bit more expensive than american car parts. I just dont understand the price difference in rebuild kits in this case. Again, thank you Tazza and all other post repliers. Thank you very much, Bob.

Also, I would have taken o-rings requiring replacement to local dealer but there was not enough o-ring left over to get them to match them up for replacement. As stated earlier, I believe I will need a plastic backup washers, therefore, requiring a complete kit. Again, Thank you very much. Bob

 

[Tazza]

Also, I would have taken o-rings requiring replacement to local dealer but there was not enough o-ring left over to get them to match them up for replacement. As stated earlier, I believe I will need a plastic backup washers, therefore, requiring a complete kit. Again, Thank you very much. Bob

Generally a hydraulic shop can work it what the O ring used to be. You take the motor parts in with you so they can work out the size it should have been. Mine have never had issues before. I had an O ring like yours, it turned into powder, that's why it didn't have any power on that side.
Loader parts source is the only place i know of that would have the parts cheaper than the dealer. They are about $135 though, you may have no choice.