Recent content by EdTrefger

Update: If you have this oil foaming problem in your crank case. Problem solved! An old mechanic told me to change the main hydrostatic pump even though it was holding good pressure, he said it was internally leaking causing the foam in the oil tank. At first I didn't believe him but I changed...

oil foaming problem solved it was a high pressure problem ; the problem is with the double stage pump the front half of the pump feeds oil cooler and hydrostatic drive motors side case wear was not more than .010 but it created back pressure at port block which caused high pressure causing...

to fishfiles my pump is a double stage pump i have main pressure set at 2200 psi on high side low side pump checked at conection shows 235 lbs it replinishes hydrostatic drive i have resealed pump also it came with end plates checked thickness about .003 diference could i still missed it pump...

i have checked replaced seals in hydraulic pump found nothing wrong then replaced both hoses on inlet side still nothing took main valve body out replaced all seals found three bad o rings checked port block found okay checked tilt block replaced seals re started bobcat have 2200 psi at main...

Thanks everyone, I have already checked the port block valve and nothing was in it. I will check out the lower hose and clamps and will report back in a few days. If anyone else has more ideas please let me know.

I have a 1986 Bobcat 843 and I'm having a problem with the oil foaming over into the reservoir and overfilling out of the tractor. This problem started all of a sudden. I've changed both filters and on the service port of the long filter it tests at 200 psi and I cannot find any leaks. I have...