texascadillac42
Well-Known Member
I have a straight JD 410 backhoe I am working on for my neighbor and am having hydraulic trouble with it. All functions work but are weak and slow.
I have replaced the tranny sump filter, as well as both cartridge hydraulic filters. I have checked the trans filter relief valve, as well as the pressure control valve on right side of trans.
Pressure gauge off of the right side of the hydraulic pump shows 2000 psi with the stroke control adjustment run all the way in. This is with the main pump deadheaded, the pressure readings are the same with the pump plumbed into the system normally.
I checked reverser pressure at the test port on the lower rear portion of the reverser valve on right side of transmission and have 155psi.
The hydraulic pump has been rebuilt by a shop I have used many times with zero issue.
After checking pressures and running stroke adjustment screw in, I pulled the filter (next to stroke control) out of the stroke control housing and found lots of brass flakes on it. The brass flakes had the crankcase outlet valve somewhat bound up. I also removed the stroke control valve and found it to have brass in it as well.
Does this brass indicate that the newly rebuilt hydraulic pump is failing, or was improperly built? Or is it possible to have brass coming from somewhere before the hydraulic pump?
My pump shop tells me that there are zero brass components in the hydraulic pump so the brass must be coming from before.....
Thank you very much for any help you can provide.
I have replaced the tranny sump filter, as well as both cartridge hydraulic filters. I have checked the trans filter relief valve, as well as the pressure control valve on right side of trans.
Pressure gauge off of the right side of the hydraulic pump shows 2000 psi with the stroke control adjustment run all the way in. This is with the main pump deadheaded, the pressure readings are the same with the pump plumbed into the system normally.
I checked reverser pressure at the test port on the lower rear portion of the reverser valve on right side of transmission and have 155psi.
The hydraulic pump has been rebuilt by a shop I have used many times with zero issue.
After checking pressures and running stroke adjustment screw in, I pulled the filter (next to stroke control) out of the stroke control housing and found lots of brass flakes on it. The brass flakes had the crankcase outlet valve somewhat bound up. I also removed the stroke control valve and found it to have brass in it as well.
Does this brass indicate that the newly rebuilt hydraulic pump is failing, or was improperly built? Or is it possible to have brass coming from somewhere before the hydraulic pump?
My pump shop tells me that there are zero brass components in the hydraulic pump so the brass must be coming from before.....
Thank you very much for any help you can provide.