Tx Jim
New Member
I'll suggest you check hyd filter relief valve to see if it's stuck/plugged with debris.
74 JD 830 Hyd pump retrofit
- Thread starter RottenGround
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RottenGround
Bronze Member
Is that right above the hyd filter seem like when i serviced it out i took that out and apart and cleaned it
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RottenGround
Bronze Member
if u go to jd parts go to tranny oil pump/lines and it is the far picture to the left that is the supply bypass valve it is suppose to open due to negative pressure I.E. when the tranny oil pump stops pumping. It is suppose to open from suction from the main hyd pump. when i run my tractor with the shifters tower off and the tranny oil pump starts pumping it has a little stream coming out of the front around the shaft that runs through it. I am wondering if it sucks air there so the main pump cant pull suction to open the supply by pass valve.
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RottenGround
Bronze Member
The Earlier tractors didnt have that supply bypass valve so I am assuming that it would be normal to lose hyd pressure when u stop the pump
Tx Jim
New Member
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RottenGround
Bronze Member
Yes when i serviced out the tractor i took the 24 and 27 out and inspected them yes #4 is the tube on the earlier SN models and the far tube to the right is the one with the supply bypass valve that is the kicker off to the bottom. If i understand right the earlier tractors with # 4 would lose hyd pressure when u clutch it. My tractor was made in germany but i can see it has the supply bypass down in mine when i take the shifter tower off and drain fluid
Tx Jim
New Member
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RottenGround
Bronze Member
Yes the one in the photo is the line with the supply bypass valve? Does the Tranny oil pump have any seals or just open on the shaft that goes through it
Tx Jim
New Member
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RottenGround
Bronze Member
OK could possibly have wear on the gears to suck air around them or the o rings in the picture could be bad?