743 steering issue

[spitzair]

It appears from your pictures that you have a later model 743. You still have an inline hydraulic filter similar to the bronze filter, but it is in a different location. If I remember right the block that's in Markle's picture will have been moved to the side of the machine frame. There should be an inline filter in there, item 52 in this picture.

 

[bunkbe]

THe real question is how does it dig or push will it spin the wheels or does one side spin and the other does not, from the sounds of it the pupms are worn out, the above picture shows the lift pump and the right hand side drive pump the left is further up in under the crossmember, it is using a common center housing for the left and right hand side of the drive, ie the high pressure. View attachment 8303

Ok great thanks for the diagram greatly appreciated.

 

[bunkbe]

IF the tires wont spin or almost kill the engine then you have bad drive pumps is the most likly issue.

ok i'll try and load the drives up

 

[bunkbe]

It appears from your pictures that you have a later model 743. You still have an inline hydraulic filter similar to the bronze filter, but it is in a different location. If I remember right the block that's in Markle's picture will have been moved to the side of the machine frame. There should be an inline filter in there, item 52 in this picture.
View attachment 8318

ok thanks ill have a look for it.

 

[bunkbe]

It appears from your pictures that you have a later model 743. You still have an inline hydraulic filter similar to the bronze filter, but it is in a different location. If I remember right the block that's in Markle's picture will have been moved to the side of the machine frame. There should be an inline filter in there, item 52 in this picture.
View attachment 8318

My hydrostatic circuitry looks like this one which doesn't have filter 52 unfortunately my serial number is 506738xxx

 

[spitzair]

Do you know how long the machine had been sitting before you got it going? There's a real good chance your hydraulic and hydrostatic systems just need all the air purged out of them. One way you could do it is to jack the machine up so that all 4 wheels are off the ground and just work them back and forth for a while. Keep checking your hydraulic reservoir level and fill as required. The hydrostatic system is a closed loop system so it will take some time to work the air out of it. To me it would be very coincidental that both sides would crater at the same time but anything is possible I guess.

 

[spitzair]

Not sure how much this will help you but this is the troubleshooting chart in my manual. It's for the 730 series machines but for all intents and purposes your hydrostatic system is virtually the same.

 

[bunkbe]

Do you know how long the machine had been sitting before you got it going? There's a real good chance your hydraulic and hydrostatic systems just need all the air purged out of them. One way you could do it is to jack the machine up so that all 4 wheels are off the ground and just work them back and forth for a while. Keep checking your hydraulic reservoir level and fill as required. The hydrostatic system is a closed loop system so it will take some time to work the air out of it. To me it would be very coincidental that both sides would crater at the same time but anything is possible I guess.

thanks i'll let it run for a while and see what happens.

 

[bunkbe]

Not sure how much this will help you but this is the troubleshooting chart in my manual. It's for the 730 series machines but for all intents and purposes your hydrostatic system is virtually the same.

ok great thanks i'll work through it.