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Cat 257B 2 down on power

Discussion in 'Compact Track/Multi Terrain Loaders' started by Seanndiane, Apr 30, 2014.

  1. Kim Sparling

    Kim Sparling Member

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    Hi Nige.
    That's the plan for now. I drained the tank and replaced the main water separator filter, as well as cleaned the screen in the lift/transfer pump. I also installed a transparent in-line filter on the line from the tank to the transfer/lift pump. I used a small electric fuel pump to prime and bleed the system and to fill the filter(s). I then removed the electric pump and bled the remaining air from the system in a normal fashion. I worked the machine for a few hours. No issues yet and the suction in-line filter still appears to be clean.. I assume the sediment will make its' way to the suction tube eventually and be caught in the in-line filter.
    So far, so good.
     
  2. heymccall

    heymccall Senior Member

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    Take the filter head apart. Ensure there is no debris in the head inlet, or the top of the filter housing.
    Pinch off your fuel line from tank and unscrew top plastic ring from filter head. Lift off primer. Lift out plastic funnel type insert. Clean out everything.
    If crap is found, use an inline screen between tank and filter (like in the before referenced thread.


    Your symptoms indicate a blockage/ restriction in the filter head. Unfortunately, it is very common.
     
  3. Kim Sparling

    Kim Sparling Member

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    Thanks heymccall.. That's good advice. Anything not caught in the left/transfer pump could accumulate in the filter head. I have installed the inline filter in the line from the tank to the lift pump. Initially I was concerned that the lift pump would not have enough suction head to pull through an inline filter, but it seems to be working fine. If it becomes partially plugged I suspect there could be issues with fuel starvation. So far, 4 days of work and no issues.
     
  4. Bryant Loomis

    Bryant Loomis New Member

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    Dec 24, 2020
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    Brockport
    Hello all.

    I am having a problem priming my fuel system. I am not getting fuel into the fuel-water separator, therefore I’m not able to prime the fuel rail. Any suggestions?

    I have a 2005 257B. SLK00532
     
  5. Nige

    Nige Senior Member

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  6. heymccall

    heymccall Senior Member

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    It was built 02/09/04.
    This hand primer is removable from the filter head. 20201224_121348.jpg
    Once removed (by spinning off the plastic collar), you can inspect the diaphragm for distortion.
    Also, it is not uncommon for debris to accumulate and block the inlet to the separator housing. So, when you are inspecting the priming pump, it would be the perfect time to ensure that the inlet isn't plugged from the inlet elbow to the outer passage here.
    20190926_184535.jpg
    The thread listed above by Nige kinda covers it, but I thought I would clarify.
     
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  7. Nige

    Nige Senior Member

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    Seems like there's been a run of the same issue recently.
    I think this is the 3rd in a week if memory serves.
     
  8. Bryant Loomis

    Bryant Loomis New Member

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    Thank you for the photos and clarification. Hopefully this will get it to prime.
     
  9. heymccall

    heymccall Senior Member

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    Arrow points to diaphragm that distorts.
    20201224_133109.jpg

    And, did this happen after changing the filter?
    It is not uncommon for the O-ring to be omitted or lost when changing the element and reinstalling the water bowl. Arrow points to that here.
    20201224_133813.jpg
    If you lost or forgot that, it will never prime.
     
    512high and Nige like this.
  10. muddog1975

    muddog1975 Well-Known Member

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    knoxville tn
    If it has a mechanical pump, there is a screen that never gets cleaned inside it. Pump is located on the block and it has a bolt on top. Loosen bolt and remove cap, be careful it has a small o-ring on the inside of the cap on the bolt. Take a pair of needle noise pliers and remove the screen. They are usually stopped up with debris. Good luck.
     

    Attached Files:

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  11. John-Car257B

    John-Car257B New Member

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    Location:
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    Hi everyone, I have a 2007 cat 257B perk 3024c unit loses power during WOT and moving forward it low rpms and when I let go of joysticks it seems to take 15s and rev’s back up. Also to add it seems fine when I have a full tank. What I’ve done- changed fuel/water separator, changed hoses, and also cleaned screen in manual fuel pump. Seems to be a fuel problem but also had milk in hydraulics so have changed that now as well.SN:SLK03916
     
  12. thepumpguysc

    thepumpguysc Senior Member

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    It’s a supply and demand situation..
    So it’s probably a partially clogged filter/screen somewhere..
    When u DEMAND MORE FUEL, it’s not available..
    Reread the past posts and go from there..
     
  13. muddog1975

    muddog1975 Well-Known Member

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    You said it runs good with a full tank.... check you pick up tube or hose in the tank....possible cracked above fuel level when not full.
    Milky hydraulic oil, try to find out where it's getting in at. Long term that not good for the hydraulic system. Hope you get it fixed soon. Good luck