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  1. M

    Case 590 Super N Coolant Temperature Sensor

    Thanks. I found a part that seems to be the right one, 500382599, and it does in fact have an aluminum washer. Hope that is the problem.
  2. M

    Case 590 Super N Coolant Temperature Sensor

    Can anyone give me the part number for the coolant temperature sensor for a Case 590 Super N backhoe, SN NEC568731? I have coolant flowing out around the sensor where it screws into the engine. I hope it's just a thread sealant problem, but would like to have a new one before I remove it. Any...
  3. M

    Cat 299D2 XHP Case drain connector leak

    Serial number: DX200548 My Cat 299D2 XHP is leaking oil from the end of the case drain connector when it is running, even when nothing is attached. If I depress the end of the connector a low pressure stream will shoot out. My question is should I have any pressure at all at the case drain...
  4. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Just wanted to follow up on the final (I hope) resolution on this problem. I installed the new hoses, so now all three hoses are new: the hose from the pump to the T and both hoses from the T to the left and right drive. I also temporarily installed another T and a hose that is attached to a...
  5. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    After the first leak, I was able to prop the cab up slightly and climb in and crank it up while someone looked in from the side to spot the leak which was very obvious. Mine is also sitting in the woods with a mulcher attached, but I have the new hoses now and will get it fixed if it ever stops...
  6. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    I'm just installing an extra T and mounting the pressure gauge and relief valve to the cab where I can see them when I release the parking brake. I'm trying to avoid spewing a huge amount of the hydraulic oil before I even realize there is a problem like the last 2 times.
  7. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Nige, would you say then that if I'm testing this with three new Cat hoses and a gauge, that I don't need to bother with a pressure relief valve? Is it even possible for that pump to output a pressure that would burst a new hose?
  8. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    I think (and hope) that my problem is going to be the same problem experienced by uglyguy. The first hose was definitely worn where it went through the opening with the other hoses to the drive. The fact that the second hose that blew was hooked to the same t-connector and blew within an hour...
  9. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Nige previously pointed out that the brake solenoid is activated to allow pressure into the line to release the spring brake. I know nothing about valves, but does the valve controlled by this solenoid regulate the pressure that goes into the line. If so, could a defective valve allow too much...
  10. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Just looked and it is in fact the brake release port. I should receive the new hoses, pressure gauge, and relief valve this weekend. If the pressure exceeds the 2250 psi relief valve, does anyone have any suggestions on what could be causing the high pressure on this line?
  11. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Thanks Nige. And thank you heymccall for posting that very helpful doc. I'll take a look at the machine shortly and identify the exact port.
  12. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Does anyone have any documentation on that drive motor, part 442-5642? If I had something showing the function of each port, that will tell me the function of the line that is blowing. I know which port the line is connected to. It is also shown somewhat by the illustration that Nige posted...
  13. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Thanks for the hydraulic schematic.
  14. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    I ordered a new hose along with the fittings necessary for me to hook up a pressure gauge and relief valve on the line. I'll get an extra hose long enough to mount the gauge and relief valve outside the cab so I can monitor it.
  15. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    If these are the parking brake lines, could it be that the Parking Brake Solenoid (Part number 278-8743) located on the pump near the point where the line returns from the T is not functioning and causing high pressure in the line?
  16. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Nige, Could you attach the hydraulic schematic? I see the the illustration that you posted and attached, but I don't see the schematic. Do the 2-speed and the parking break release circuits both go back to the pump? Is it surprising that the 2-speed travel lines are only 3/8" 2250psi lines...
  17. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    I used the machine for at least an hour before the second hose failed.
  18. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    In the picture above, the elbow at the top is connected to the t-connector with the two blown hoses. The second hose blew in a spot in the open with no abrasion. I'm hesitant to just replace the hose since there seems to be a pressure problem. Is there a relief valve for that port?
  19. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

  20. M

    Cat 299D2 XHP Blowing hydraulic hoses. Bad relief valve?

    Just finished looking at it and you are correct. There is one hose from each side that blew and both of them are part num 345-4633 and are both connected to the same t-connector. The other end of that t-connector is connected to the top of the main pump (I guess) with a hose with part number...
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