bobcat 743

[chmura]

Bought two days ago.... worked perfect for two days. all of a sudden I lost all functions of the arm and bucket. Fluid was low but topped up and I still have no movement? Any locks on this? Im a newbie pls help

 

[chmura]

I was told I may need to bleed it? any ideas?

 

[skidsteer.ca]

I was told I may need to bleed it? any ideas?

It should self bleed or a short period of operation.
How much di you have to add?
It sounds like the pump drive failed and the pumps are not turrning, but this drive from a diveshaft and you would have heard a noise when the ujoint grenaded. Not sure???
Tazza is the resident 743 expert, there are other too , no offence anyone, he is in bed right now (Its that living in the future Auzzie time thing
Ken

 

[chmura]

It should self bleed or a short period of operation.
How much di you have to add?
It sounds like the pump drive failed and the pumps are not turrning, but this drive from a diveshaft and you would have heard a noise when the ujoint grenaded. Not sure???
Tazza is the resident 743 expert, there are other too , no offence anyone, he is in bed right now (Its that living in the future Auzzie time thing
Ken

We were loading a dumpster..... once the arms came half way down it stopped..... so we parked it.... in the am arms were laying on ground.... and would not move up down or bucket would not tilt.... added about a gallon of fluid

 

[chmura]

It should self bleed or a short period of operation.
How much di you have to add?
It sounds like the pump drive failed and the pumps are not turrning, but this drive from a diveshaft and you would have heard a noise when the ujoint grenaded. Not sure???
Tazza is the resident 743 expert, there are other too , no offence anyone, he is in bed right now (Its that living in the future Auzzie time thing
Ken

no noises heard....

 

[thetool]

no noises heard....

Well if you lost your pump coupler it wouldn't drive, either, unless the shaft on the end of the pump stack snapped. Even then, down pedal will let the boom down by gravity.
Sometimes guys drive around without the cab bolted down, and the seat bar is not fully against the interlock blocs. If the pedals won't move, check the interlocks. Vertical bars by your knees that lock into the pedal linkage bars below.
Sometimes guys will inadvertently move the right steering lever over to the right and lock it in aux detent. Then you have all kinds of lift and tilt whackiness going on. Move the right steering lever sideways left and right and make sure it's centered.
Those are quick checks, you may have to lift your cab and check out linkages.
Good Luck.

 

[jerry]

Well if you lost your pump coupler it wouldn't drive, either, unless the shaft on the end of the pump stack snapped. Even then, down pedal will let the boom down by gravity.
Sometimes guys drive around without the cab bolted down, and the seat bar is not fully against the interlock blocs. If the pedals won't move, check the interlocks. Vertical bars by your knees that lock into the pedal linkage bars below.
Sometimes guys will inadvertently move the right steering lever over to the right and lock it in aux detent. Then you have all kinds of lift and tilt whackiness going on. Move the right steering lever sideways left and right and make sure it's centered.
Those are quick checks, you may have to lift your cab and check out linkages.
Good Luck.

Aux hydraulics engaged by accident? Is the right had lever centered or does it seem a little to far to the right? If so it may be in the aux detent position.

 

[chmura]

Aux hydraulics engaged by accident? Is the right had lever centered or does it seem a little to far to the right? If so it may be in the aux detent position.

Hey guys.... I was told doing the right lever to the right was a way of "bleeding" the system.... All I can get it to do is slightly move it left and right.... but does not seem to lock in or out of this aux position.... from the sounds of things i should know when it is in that position....

 

[chmura]

Hey guys.... I was told doing the right lever to the right was a way of "bleeding" the system.... All I can get it to do is slightly move it left and right.... but does not seem to lock in or out of this aux position.... from the sounds of things i should know when it is in that position....

I played with it by tapping down on both foot pedals like 100 times..... moves about 1/8 each time.... so i had it to the point approx foot of the ground up in the air with bucket closed in.... drove it for 1/2 hour with jumping shaking anything i could think of to get it out of aux if its in there.... almost seems like fluid is not under enough pressure to move the arms and bucket... does the steering not work of the same hydrolics? on the way down and tipping bucket it goes a lot easier but still not normal....

 

[thetool]

I played with it by tapping down on both foot pedals like 100 times..... moves about 1/8 each time.... so i had it to the point approx foot of the ground up in the air with bucket closed in.... drove it for 1/2 hour with jumping shaking anything i could think of to get it out of aux if its in there.... almost seems like fluid is not under enough pressure to move the arms and bucket... does the steering not work of the same hydrolics? on the way down and tipping bucket it goes a lot easier but still not normal....

Man I dunno. It sure sounds like your aux is engaged. I guess you're starting it okay, it would be hard to start with the aux engaged, but dang if it dosen't sound like that with what you describe going on. Maybe Tazza knows more. I'm gonna sleep on it.

 

[jerry]

Man I dunno. It sure sounds like your aux is engaged. I guess you're starting it okay, it would be hard to start with the aux engaged, but dang if it dosen't sound like that with what you describe going on. Maybe Tazza knows more. I'm gonna sleep on it.

Look down below on the right hand lever there should be a place where you can drop a 3/8 bolt in and that keeps you from engaging the aux hydraulics. The bolt may be in and that is why you can not move the lever very much sideways. If it is not in, put it in, you may have to give the lever a quick tug to release it if it is in detent and move it to the left to put in the bolt. The detent is to give you constant flow to your couplers.

 

[Tazza]

Look down below on the right hand lever there should be a place where you can drop a 3/8 bolt in and that keeps you from engaging the aux hydraulics. The bolt may be in and that is why you can not move the lever very much sideways. If it is not in, put it in, you may have to give the lever a quick tug to release it if it is in detent and move it to the left to put in the bolt. The detent is to give you constant flow to your couplers.

Sorry! i just got up!
I agree with the aux being stuck on. Grab the right hand lever and pull it all the way to the left then let it go, it should spring back to centre. When its running, can you hear like a whistle? if so thats a further indication that the aux us stuck on as oil is flowing over your relief valve.
As you still have drive I'd say your pump shaft is not broken and as you have stated you can SLOWLY lift the bucket in short bursts so the pump has to be working.
Now, with the lever, there was a bolt that was installed to prevent the aux from sticking on when you don't use an attachment that requires aux hydraulics. Most people over there use smooth buckets so they don't need it, so they lock it out. If its something you use you simply remove the blot and you are good to go.
I would start there and if its not it, start looking further. Its the easiest spot to start.

 

[chmura]

Sorry! i just got up!
I agree with the aux being stuck on. Grab the right hand lever and pull it all the way to the left then let it go, it should spring back to centre. When its running, can you hear like a whistle? if so thats a further indication that the aux us stuck on as oil is flowing over your relief valve.
As you still have drive I'd say your pump shaft is not broken and as you have stated you can SLOWLY lift the bucket in short bursts so the pump has to be working.
Now, with the lever, there was a bolt that was installed to prevent the aux from sticking on when you don't use an attachment that requires aux hydraulics. Most people over there use smooth buckets so they don't need it, so they lock it out. If its something you use you simply remove the blot and you are good to go.
I would start there and if its not it, start looking further. Its the easiest spot to start.

I Gave up and took it to the dealer for an estimate...thanx for the help we'll see what they say... It is not the aux. that all works fine....