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  #11  
Old 08-05-2018, 08:27 PM
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Try the heavey equipment forums for brand specific issues. Mine had a separate pump for the front. The drive system uses a swash plate to vary the drive speed. In general, scoring or glazing on the plate is whhat causes the groaning. This is fluid leaking past the swash plate. It is sometimes possible to remove the plate and sand/polish on a flat surface. I used glass with sandpaper in various grits. Then flush the system and reinstall. It may fix it, maybe for a long time, maybe for a short time. The recommended procedure is to pull your drive pumps and motors and have them rebuilt, flush the hoses and reinstall.
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  #12  
Old 08-05-2018, 10:13 PM
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First off loader boom and bucket are mostly separate, so that's not a help in diagnostics. When was the last time you changed filters and hydraulic oil? Most machines filter on the suction side so clogged filter you will lose charge pressure. Lost charge pressure causes pistons to lift off of the swash plate and loss of drive.
On CaseIH machines charge pressure is somewhere In the 300-400psi range depending on machine. Another thing to remember is hydrostatic drive is a closed loop system with charge pressure making up for leakage in the system that is returned to tank through case drain on the pumps and motors. Using the case drain and checking flow you can narrow down the defective component.

Now with all that said I am thinking you have a charge pressure problem. Either a failing charge pump, charge relief valve, or clogged suction filter/screen.

Good luck! Try to get some model specific information it will be very helpful.

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  #13  
Old 08-06-2018, 01:02 AM
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now this maybe out of the realm of possibility but is it possible for a Hydraulic like to collapse internally
Like when on the brake line on the front calipers collapse on a vehicle and cause the caliper to seize but in this instance causing restricted return or pressure ?
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  #14  
Old 08-06-2018, 09:54 AM
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Well I guess it is possible however in 30 years of experience repairing ag equipment I personally haven't seen it.

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  #15  
Old 08-06-2018, 10:08 AM
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This is the drive schematic for a Case 1845B. Not the same system but probably similar.Click image for larger version

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  #16  
Old 08-06-2018, 10:35 AM
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A suction line ‘could’ collapse, but not a common thing for sure.

Change and check filters first, then another diagnostic is to add some tees into the system with gauges, so you can see what you have where.


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  #17  
Old 08-06-2018, 12:33 PM
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Quote:
Originally Posted by greywynd View Post
A suction line ‘could’ collapse, but not a common thing for sure.

Change and check filters first, then another diagnostic is to add some tees into the system with gauges, so you can see what you have where.


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oil and filters were serviced rite after problem started I use Amsoil
products in it as it was what was being used when I acquired it. and eventually will cut that cost by changing over to something else.

Ill get my hyd. gauges out and give it a go over and if nor restrictions I will assume its the final drives going bad but will be a few days before I get to it as got to finish some work in order to pay for all the $$ this is going to cost. as it serves no purpose if its down and not usable sort of like the computer and cell phone got to have em in todays world...
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  #18  
Old 10-16-2018, 08:29 PM
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Default just a little update

So with the drive issue it traced down to being the back pump on the hydrostatic trans front pump was good and still supplying the bucket so couldn't find just the rear pump so ended up having to buy the whole unit
and it just came in about 45 minuets ago....
even for an old bobcat skid steer 1998 they are proud of their parts 3k shipped

My buddy footed the bill on this for a shared interest in the bobcat..
so it works for me in the long haul.
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