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Thread: Anyone a hydraulic genius

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    4 Star General Coffey1's Avatar
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    Default Anyone a hydraulic genius

    Need someone who is a wizard on hydraulics to help me figure out why my wrecker is working but not correctly.
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    4 Star General frank8003's Avatar
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    What is not working proper and do you have the schematics and what flavor is it?
    3 questions
    I was here, had a good time.

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    4 Star General Coffey1's Avatar
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    M1089
    No line drawings as of yet looking for them
    First problem the primary selector valves do absolutely nothing per operation manual you put selector valve on crane and only crane works put valve on wrecker and only wrecker works they both work no matter valve position.

    2nd problem wrecker lift will only take a truck up so far the tires are on tow vehicle will almost leave ground but not enough for you to spin tires.
    The lift goes all the way down and goes all the way up with no load
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    4 Star General Coffey1's Avatar
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    All the other stuff the crane front winch and the two 30k winches out the back work perfectly under load.
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    4 Star General coachgeo's Avatar
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    Quote Originally Posted by Coffey1 View Post
    ....
    First problem the primary selector valves do absolutely nothing per operation manual you put selector valve on crane and only crane works put valve on wrecker and only wrecker works they both work no matter valve position....
    Holey sentence Batman......... what the hayel did he just try to explain with those words. lol

    Coffey.... do you mind putting in some commas and periods or something...... that sentence can be read hundred different ways.
    Last edited by coachgeo; 10-04-2019 at 11:43.
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    4 Star General Coffey1's Avatar
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    No matter what position those valve's are in, everything operates.
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    4 Star General coachgeo's Avatar
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    Quote Originally Posted by Coffey1 View Post
    No matter what position those valve's are in, everything operates.
    ahhhhhh ok. on the much more simple manifold of the FMTV hydraulics....... a few folk have had to rebuild/replace a valve such as the raise/lower valve of spare tire cause it did not work. maybe its that...... would be nice and simple if so? hope for you that is the case. What about a line installed in wrong place allowing a check valve to be bypassed that would prevent what is occurring in your situation. folk have run across quick improper re-assembly of where hose install prior to auctions too.

    besides that though..... in this situation...... do both items still work at full capacity? Might it be an advantage to keep it like that if they do? May be rare times you need both to work at same time.... though hydraulic pump might get massively taxed.

    Maybe those help?? No expert by any means.... good luck
    Last edited by coachgeo; 10-04-2019 at 12:57.
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    4 Star General wheelspinner's Avatar
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    Wrecker Hydraulics.pdf

    Ken, I have the entire air, electrical and hydraulics schematics combined into a single file. I'm going to try and upload them

    Edit: The whole file was 33 M and too big to upload, so I culled it down to just the two pages on the Wrecker Hydraulics
    Last edited by wheelspinner; 10-05-2019 at 07:50.
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    the stinger not going up is classic weak cylinders. If they are not leaking then I would put a pressure gauge on the port for the pressure and see what you have when it is raising without and with a load. If you have correct pressure (2500psi) then it is bleeding off thru the cylinders.
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