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hydraulic

  1. B

    Bobcat T 770 High Flow Hydrolic problem

    My T770 keeps jumping out of high flow. In the mornings when the hydraulic fluid is cold the high flow runs find and than after about 30 minutes is will jump out of high flow and will not go back in. Time after time and i am running a mulcher head. Does anyone know why it keeps jumping out of...
  2. CaptSkinny

    JLG 450A - valve ID

    I bought a JLG 450A that I think has some valves in the wrong position, or an incorrect valve installed. But the JLG part numbers in the manual don't match the numbers printed on the valves, which are Hydraforce part numbers (JLG's manufacturer for the OEM values), so I can't verify that they're...
  3. M

    ‘72 Case 580b hydraulic problems

    We blew a hydraulic hose under the seat for the back bucket. Got a new one and blew through to check for any blockages. Put it on, replaced hydraulic fluid. Backhoe won’t start. The Googles advises us that if we work the front bucket while simultaneously attempting to start it, we might have...
  4. N

    have 2002 a S 250

    have a 2002 S250 serial # 520711464 have a low charge pressure light. want to check pressure with gage need to know what it should be at low throttel and full throttle .if the sensor is bad will it cause the hyd be slowed?.due to miss info? this unit had both drives and hydro and pump all...
  5. J

    Cat 308 hydraulic fluid or motor oil

    I have a 97 cat 308B. I went to change the filters the hydraulic filter was milky. I am going to change to fluid. My father in law had an older JD that took motor oil in the hydraulic fluid. Does anyone know if this takes hydraulic fluid or motor oil? TIA!
    • jxa5094
    • Thread
    • cat caterpillar excavator hydraulic john deere komastsu midi
    • Replies: 0
    • Forum: Excavators
  6. I

    1044C-54 Lull Hydraulic surging Pulse problem

    I have 2 of these machines and one is worse than the other to the point we’re the machine shuts off with a heavy load I have replaced the pressure relief valve on the control valve assembly and the one on the pump I was first told it could be the accumulator not being precharged and I purchase a...
  7. Pete w

    John Deere 490 Stall

    Good morning Ladies and Gents, I need some help with a 490 we have here. Its been sitting for a while, took it to a job to use it and it kept stalling under load and if you hold a function over relief. Doesn't matter what mode its in. Changed fuel filters. Checked air filter. Purrs like a...
    • Pete w
    • Thread
    • electical hydraulic sensor stalls
    • Replies: 25
    • Forum: Excavators
  8. backhoegene

    JD 410G hydraulic pump internal leak?

    I have a 410G with a hydraulic bleed down problem. First of all there are no external hydraulic leaks I can see. I feel like hydraulic fluid is passing through a valve somewhere inside the pump. I’ll lift the machine up with the stabilizers and bucket and after about 5 minutes of digging the...
  9. G

    Bobcat s650 hydraulic oil temp out of range high

    I recently purchased a 2014 bobcat s650 and it started giving me a code M0721 saying hydraulic oil temp out of range high. It only has about 1,020 hours. I was wondering what could be the cause to this? Or would I have to change the $700 sensor
  10. W

    MSS Malfunction?

    I've got a 2002 CAT Excavator (grey market). Having intermittent problems with hydraulics not responding at all. I've been told that it might be the result of the MMS system not working and shutting hydraulic system down. Can anyone provide info on this system? Can it be fixed, replaced...
  11. B

    Deere 310G Backhoe

    Hey guys, Having an issue with my 310G backhoe. There is hydraulic fluid getting into my rear end, which is filling up and coming out the breather vent. I replaced the three seals on the emergency brake housing, but its still acting up. After replacing the seals, I put fresh fluid in the rear...
  12. G

    Need hydraulic control valve help on 70s Ford 4500/750 backhoe

    Hello all. This is my first post to Heavy Equipment Forums. I'll appreciate any information, advice or help you can offer. BACKGROUND: I have searched this site and a number of others, but have not found specific information. However, I KNOW many others have had the same type of problem that...
  13. shawnseveras

    replacing old hydraulic fan on cat 246 skid steer

    so long story short i am replacing the old hydraulic fan motor and assembly. i will be installing an electric motor in its stead. i will be disconnecting the offload line part number- 148-8385 and putting a plug there. then i am disconnecting the inflow line for the hydraulic fan motor and...
    • shawnseveras
    • Thread
    • cat cat 246 caterpillar cooler electrical fan fan blade hydraulic hydraulic help skid steer
    • Replies: 59
    • Forum: Skid Steers
  14. shawnseveras

    Cat 246 skidsteer-replacing top seal on hydrolic fan motor.

    so i recently found out about this forum via google search. and i found out that the seal atop the cooling fan motor could be replaced. i have a cat 246 and we were having a problem with the fan motor spraying oil all over the place when it reached a certain temperature. once pinpointed i did a...
    • shawnseveras
    • Thread
    • cat cat 246 hydraulic hydraulic movement motor radiator skid steer
    • Replies: 18
    • Forum: Skid Steers
  15. D

    Volvo BL70 Front bucket very slow moving

    2003 Volvo BL70 backhoe has been running good and today the front bucket rotates and lifts up and down, but very very slow. I suspect that the servo pump has to be replaced. Looking for maybe alternatives I did not think of? Duane
  16. W

    Case 580SE having hydraulic fluid changing problems

    Got a friend with a Case 580 Super E and the hydraulics worked fine til he changed the fluid and filter, now he has no hydraulics. He has pressurized the hydraulic tank and bled all lines and has slight movement in hydraulics. Any possible solutions or ideas would be appreciated.
  17. B

    Case 580SK sudden loss of hydraulics

    Hi to all. Firstly, thanks for this incredible source of information. Nevertheless, I've gone through the threads but cannot seems to find something relating to my issue. Yesterday I was setting up my backhoe stabilisers and for once went to the full extension. As I hit full extension, the...
  18. chandler starling

    Hitachi EX-230-5

    Good afternoon gentlemen, Tractor reference is 1999 Hitachi 230lc-5 S/n ANT400040 this tractor as about 7000 hours on it. It has always been a good machine other than being rough (compared to newer). Well taken care of and used daily. I noticed today that the hydraulic oil is very dark...
  19. A

    Massey Ferguson 1980s MF80 Hydraulic issue

    Hi i am working on a 1980s Massey Ferguson MF80 Backhoe and the Backhoe will not lift up and pushes hydraulic fluid out of the top seal (Images attached). I also can not find parts or any manuals on this Backhoe any help would be greatly appreciated. Was also told it could be o'rings needing...
  20. R

    Bobcat 463 hydraulic problem

    Hey guys I have a 2006 bobcat 463 I blew a hose to the tilt my guys ran it damn near out of fluid got the new line in did both for the tilt now the machine drives fine and will tilt down to lift the front tires off the ground bucket wont curl up past flat and the arms wont lift is there a way...
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