wont turn one side

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minibob

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hi fellas my 343 bobcat wont turn left .push the lever foward it goes foward the same when you pull it back it goes back but wont twist around to the left. the right hand side works fine.When i jacked the side up to turn the front wheel the back wheel moved which i suppose means the chain is still intacted.Any ideas
 

skidsteer.ca

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Are these a clutch drive or a hydro machine? Whats that model # again?
Is it that the right side won't drive or the left side wont brake?
Ken
 
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minibob

minibob

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Are these a clutch drive or a hydro machine? Whats that model # again?
Is it that the right side won't drive or the left side wont brake?
Ken
sorry guys got it all wrong it wont turn right you push the left lever foward and pull the right lever back and it struggles to turn to the right.it seems the wheels on the left dont want to turn,but if you only push the left lever foward by itself it will drive straight ahead.
 
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minibob

minibob

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sorry guys got it all wrong it wont turn right you push the left lever foward and pull the right lever back and it struggles to turn to the right.it seems the wheels on the left dont want to turn,but if you only push the left lever foward by itself it will drive straight ahead.
its a hydro machine 343
 

scar99

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Dec 24, 2007
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its a hydro machine 343
Are you sure that is the correct model #? I can not find a 343. If it is a hydostatic machine it could be a motor or a pump. The easiest way I have found is remove the hose from the motor and cap off the hoses and the fittings on the motor. Start the machine and move that lever if it boggs the engine and tries to kill it the pump is good and it is probably the motor. If it does not bogg the engine down alot then it could be in the pump. Hope it helps. If your not sure of the model send me the serial # and I will see if I can figure it out.
 

Tazza

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Are you sure that is the correct model #? I can not find a 343. If it is a hydostatic machine it could be a motor or a pump. The easiest way I have found is remove the hose from the motor and cap off the hoses and the fittings on the motor. Start the machine and move that lever if it boggs the engine and tries to kill it the pump is good and it is probably the motor. If it does not bogg the engine down alot then it could be in the pump. Hope it helps. If your not sure of the model send me the serial # and I will see if I can figure it out.
What happens when you try to use that side? does it squeel, bog down, vibration in the stick, anything? I was thinking chain but you would need to snap 2 chains. The gear case should run 2 chains, one to the front one to the back for each side.
If its only one side it does point to it being the motor or the pump section for that side. I personally wouldn't plug the hoses but it would give you an indication. If you could attach a pressure gauge to the hoses it would tell you a lot too, the manual for my 731 said you can test it that way but don't go over 3,000 PSI i think it said (the pump can deliver over 5,000 psi)
 
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minibob

minibob

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What happens when you try to use that side? does it squeel, bog down, vibration in the stick, anything? I was thinking chain but you would need to snap 2 chains. The gear case should run 2 chains, one to the front one to the back for each side.
If its only one side it does point to it being the motor or the pump section for that side. I personally wouldn't plug the hoses but it would give you an indication. If you could attach a pressure gauge to the hoses it would tell you a lot too, the manual for my 731 said you can test it that way but don't go over 3,000 PSI i think it said (the pump can deliver over 5,000 psi)
Bobcat Serial NO:5035-jam-14331 PUMP is a Daikin < PV1515-519 51-JD-17658 Drive motors are also Daikin
 
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minibob

minibob

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What happens when you try to use that side? does it squeel, bog down, vibration in the stick, anything? I was thinking chain but you would need to snap 2 chains. The gear case should run 2 chains, one to the front one to the back for each side.
If its only one side it does point to it being the motor or the pump section for that side. I personally wouldn't plug the hoses but it would give you an indication. If you could attach a pressure gauge to the hoses it would tell you a lot too, the manual for my 731 said you can test it that way but don't go over 3,000 PSI i think it said (the pump can deliver over 5,000 psi)
Bobcat Serial NO:5035-jam-14331 PUMP is a Daikin < PV1515-519 51-JD-17658 Drive motors are also Daikin
 
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minibob

minibob

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Messages
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What happens when you try to use that side? does it squeel, bog down, vibration in the stick, anything? I was thinking chain but you would need to snap 2 chains. The gear case should run 2 chains, one to the front one to the back for each side.
If its only one side it does point to it being the motor or the pump section for that side. I personally wouldn't plug the hoses but it would give you an indication. If you could attach a pressure gauge to the hoses it would tell you a lot too, the manual for my 731 said you can test it that way but don't go over 3,000 PSI i think it said (the pump can deliver over 5,000 psi)
Bobcat Serial NO:5035-jam-14331 PUMP is a Daikin < PV1515-519 51-JD-17658 Drive motors are also Daikin
 

Tazza

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Sorry guys ,have trouble loading the full thread for some reason
I'm surprised the site allowed it to duplicate. I was going to delete the 2 additional posts but i don't want it to nuke the entire thread on you.... I'll leave that one for owensge, he knows what it will do.
I take it you have had no success with the drive issues? Did you try swapping motors at all?
 
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minibob

minibob

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I'm surprised the site allowed it to duplicate. I was going to delete the 2 additional posts but i don't want it to nuke the entire thread on you.... I'll leave that one for owensge, he knows what it will do.
I take it you have had no success with the drive issues? Did you try swapping motors at all?
Yeah Tazza ,swapped the motors over and still have the same problem on the left hand side.(Ive Jacked the Machine up and took the wheels off. the left hand side hardly moves at all).So it must be a pump problem on the left side of the pump. Any guesses what the problem may be inside as the right side of the pump is fine. The Pump is a Daikin PV1515-519 51-JD-17658.
 
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minibob

minibob

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Yeah Tazza ,swapped the motors over and still have the same problem on the left hand side.(Ive Jacked the Machine up and took the wheels off. the left hand side hardly moves at all).So it must be a pump problem on the left side of the pump. Any guesses what the problem may be inside as the right side of the pump is fine. The Pump is a Daikin PV1515-519 51-JD-17658.
There was no metal shaving seen in any oil. And drive chains are all good and intacted.
 

Tazza

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There was no metal shaving seen in any oil. And drive chains are all good and intacted.
The only thing you can do is pull the pump and crack it open. I don't know anything about that brand of pump but it should be essentially the same as other variable displacement piston pumps. It could be a worn swash plate or the rotating group. I just wonder if it could be a simple as a stuck relief or poppet. These should be in the center of the pump where the hydro motor hoses connect up. Thats the last thing you could check before opening the pump up.
 
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minibob

minibob

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The only thing you can do is pull the pump and crack it open. I don't know anything about that brand of pump but it should be essentially the same as other variable displacement piston pumps. It could be a worn swash plate or the rotating group. I just wonder if it could be a simple as a stuck relief or poppet. These should be in the center of the pump where the hydro motor hoses connect up. Thats the last thing you could check before opening the pump up.
Ill check it out. its something that happened straight away it didnt come on gradually.maybe it might be that simple
 

Tazza

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Ill check it out. its something that happened straight away it didnt come on gradually.maybe it might be that simple
I hope it is that simple, coming on so fast does seem like it could be something stuck than wear that would cause it to get weak then stop. It could get weak fast, as in a few hours work but i would doubt it would just stop from wear.
 
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minibob

minibob

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I hope it is that simple, coming on so fast does seem like it could be something stuck than wear that would cause it to get weak then stop. It could get weak fast, as in a few hours work but i would doubt it would just stop from wear.
Hey tazza ,good news mate .started pulling out and found a broken roll pin in the main arm on the pump. ill put a new one in and keep you informed hopefully its just the one problem.
 
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minibob

minibob

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Hey tazza ,good news mate .started pulling out and found a broken roll pin in the main arm on the pump. ill put a new one in and keep you informed hopefully its just the one problem.
The shaft seems to turn freely as if all is well in side
 

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