Bobcat 743 1990 years one party at advance isn't valid. (one wheel motor drives in only one direction)

nester1 · Apr 4, 2011

At mine Bobcat 743 1990 years one party at advance isn't valid (forward one side does not drive). Back both parties (motors) work normally. A problem in drive pump or drive motor? Whether I can define a problem without the expert?
It is written with the help google the translator.

OldMachinist · Apr 4, 2011

I think he's saying that there no forward drive on one side but both sides work fine in reverse.
It sounds like the shuttle valve(Item 3 in the diagram below) in the drive motor is not working on that side. You can verify it's the motor by swapping them side to side.

nester1 · Apr 4, 2011

OldMachinist said:
I think he's saying that there no forward drive on one side but both sides work fine in reverse.
It sounds like the shuttle valve(Item 3 in the diagram below) in the drive motor is not working on that side. You can verify it's the motor by swapping them side to side.

Thanks for a prompt reply. Within the next few days I will try to change motors in places. Tell, and the additional bronze filter drainage lines in my model is? For two years of operation by me the basic filter of hydraulics changed only.

OldMachinist · Apr 4, 2011

nester1 said:
Thanks for a prompt reply. Within the next few days I will try to change motors in places. Tell, and the additional bronze filter drainage lines in my model is? For two years of operation by me the basic filter of hydraulics changed only.

The filter should affect both sides but it wouldn't hurt to check it.

nester1 · Apr 4, 2011

OldMachinist said:
The filter should affect both sides but it wouldn't hurt to check it.

At me port block looks in another way. I can not photograph because of hoses from above. But near to the temperature gage is fitting. I think it and there is a bronze filter.

OldMachinist · Apr 5, 2011

nester1 said:
At me port block looks in another way. I can not photograph because of hoses from above. But near to the temperature gage is fitting. I think it and there is a bronze filter.

What is the machine's serial number?

skidsteer.ca · Apr 5, 2011

Om, I read the 1st post last night but I guess I was too tired for it to sink in. Good translation effort.
Nester, welcome to the forum.
What is your native tongue?
Do you mind if I edit you post to clear up its meaning for future searches.
I just recently started using the google translate feature and it works quite well it seems.
Welcome aboard
Ken

nester1 · Apr 5, 2011

skidsteer.ca said:
Om, I read the 1st post last night but I guess I was too tired for it to sink in. Good translation effort.
Nester, welcome to the forum.
What is your native tongue?
Do you mind if I edit you post to clear up its meaning for future searches.
I just recently started using the google translate feature and it works quite well it seems.
Welcome aboard
Ken

Serial number 501962734. My native language Russian, but I live in Kazakhstan. Серийный номер 501962734. Мой родной язык русский, но я живу в Казахстане.

nester1 · Apr 6, 2011

skidsteer.ca said:
Om, I read the 1st post last night but I guess I was too tired for it to sink in. Good translation effort.
Nester, welcome to the forum.
What is your native tongue?
Do you mind if I edit you post to clear up its meaning for future searches.
I just recently started using the google translate feature and it works quite well it seems.
Welcome aboard
Ken

Greetings Ken. Yes, of course, I not against that you have changed the post. I immediately haven't understood that Google has translated

nester1 · Apr 13, 2011

[No message]

nester1 · Apr 13, 2011

nester1 said:
[No message]

I haven't noticed that the translator not has translated all words. Only yesterday it was possible to be engaged in bobcat, has changed hydrostatic motor in places. But the problem and remained, and I have noticed that оn the other hand to weakness at movement back too has insufficient force. It turns out right forward, and left back. I plan to change in places high pressure relief valve. In advance thanks for any council.

nester1 · Apr 19, 2011

Today has changed in places high pressure relief valve on the hydrostatic pump, but the problem remained. There is not a big flute on a forward part of the valve.
I think that because of complexities with transfer, I have initially stated incorrectly a problem. At mine Bobcat the left-hand side forward pulls at the full capacity, and back it pulls, but is very weak. And at the right party forward it is weak, and back at the full capacity.
If to be developed on a place to the right all it is good, to the left with the big effort and it is weak. And to the left the turn if left-hand side to stop is better turns out, and to work only right forward. Together both more slowly. If the problem in drive motors, whether that is impossible more accurately the scheme as it to disassemble.
I so understand that if the problem in piston and shuttles having changed drive motors in places with my difficulties in movement of nothing will change, as drive motors turn over. Whether I do not know my descriptions in transfer are clear, but I very much hope on in any help.

nester1 · Apr 19, 2011

nester1 said:
Today has changed in places high pressure relief valve on the hydrostatic pump, but the problem remained. There is not a big flute on a forward part of the valve.
I think that because of complexities with transfer, I have initially stated incorrectly a problem. At mine Bobcat the left-hand side forward pulls at the full capacity, and back it pulls, but is very weak. And at the right party forward it is weak, and back at the full capacity.
If to be developed on a place to the right all it is good, to the left with the big effort and it is weak. And to the left the turn if left-hand side to stop is better turns out, and to work only right forward. Together both more slowly. If the problem in drive motors, whether that is impossible more accurately the scheme as it to disassemble.
I so understand that if the problem in piston and shuttles having changed drive motors in places with my difficulties in movement of nothing will change, as drive motors turn over. Whether I do not know my descriptions in transfer are clear, but I very much hope on in any help.

Show please a forum thread where to be told as the image to attach to messages.

nester1 · Apr 19, 2011

nester1 said:
Show please a forum thread where to be told as the image to attach to messages.

Has enclosed a photo in Internet Explorer. In Google Chrome it is not supported.

Tazza · Apr 20, 2011

nester1 said:
Has enclosed a photo in Internet Explorer. In Google Chrome it is not supported.

Removing the plug will give you assess to the shuttle valve. It wouldn't hurt to make sure that it moves.
I'm wondering if the problem could be a blown high pressure seal in the motor. If one is leaking, the oil could be by-passing and not doing any work in one direction. Just a thoght.
The marks on the high pressure relief valves don't look bad at all.

nester1 · Apr 20, 2011

Tazza said:
Removing the plug will give you assess to the shuttle valve. It wouldn't hurt to make sure that it moves.
I'm wondering if the problem could be a blown high pressure seal in the motor. If one is leaking, the oil could be by-passing and not doing any work in one direction. Just a thoght.
The marks on the high pressure relief valves don't look bad at all.

Similar shuttle valve is perfectly in order, except for the small flutes rubbed with springs on shuttles from outer side.

But I have found out internal seal damaged with one edge.

There can be it a problem? The second motor didn't assort still. Whether I can not to wait the original, to pick up or turn from a caprolactam the similar?

nester1 · Apr 21, 2011

nester1 said:
Similar shuttle valve is perfectly in order, except for the small flutes rubbed with springs on shuttles from outer side.

But I have found out internal seal damaged with one edge.

There can be it a problem? The second motor didn't assort still. Whether I can not to wait the original, to pick up or turn from a caprolactam the similar?

I don't know consolidation from what material, but at us is similar of ftoroplast . Today I will try to put. And shuttles on the transfer valve should sit densely or can a little freely?

skidsteer.ca · Apr 22, 2011

nester1 said:
I don't know consolidation from what material, but at us is similar of ftoroplast . Today I will try to put. And shuttles on the transfer valve should sit densely or can a little freely?

I see you found a way to post a picture, but under the FAQ section
PICTURES - How do I post pictues?
I'd say the seal needs to be changed. The shuttles valve should fit tight but move freely without sticking. Though Tazza will likely chime in, he quite famiar with these and I have only looked at pictures
Ken

nester1 · Apr 22, 2011

skidsteer.ca said:
I see you found a way to post a picture, but under the FAQ section
PICTURES - How do I post pictues?
I'd say the seal needs to be changed. The shuttles valve should fit tight but move freely without sticking. Though Tazza will likely chime in, he quite famiar with these and I have only looked at pictures
Ken

At me the nearest dealer in native land in 750 km, and in Russia of 350 km. Therefore I ask somebody can tell from what material seal is made? And freely it enters in balance ring?

Bobcat 743 1990 years one party at advance isn't valid. (one wheel motor drives in only one direction)

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