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Fisher SEHP stuck right

Discussion in 'Fisher Engineering Discussion' started by weav41, Jan 19, 2014.

  1. weav41

    weav41 Junior Member
    Messages: 4

    Any thoughts would help.

    Here is the problem.
    I took my SEHP off of my 9 foot MC, and put it on another 9 foot HD that I just bought a few months back. The MC was rotted anyways. Put the motor on the new plow. Worked for a short time in all directions. Cycled it though in all directions many times, everything worked as it should. Took the truck out and plowed about 100 feet and the plow would just go to the right angle and lock. When this would happen, which ever direction you would choose the plow would just go right. Then, there would be no response in the controls. When it would lock up, you can still hear the motor running.

    So, took it apart. Drained, cleaned the pump and housing, pump filter and magnet, bench tested the solenoids, replaced the S2, greased all connections in the plugs, replaced the relay, cleaned up the wires for the new relay. Put everything back together, refilled with new atf, bled as best possible and topped off. Surprisingly would work again then, do the exact same thing. Go to the right and lock.

    I figured at this point it would have to be the cross over relief valve. So, tried to get them out, but i found out that they were known for being trouble. That turned into ordering a new valve body. Now, it has a new valve body and all new valves. It worked fantastic, and then once again (drop the plow and go a few feet) goes to the right and then locks up.

    This has taken place in about a months time span of tinkering with this motor. This motor has shown about 5 (brief) signs of life, and then just lock to the right.

    I am learning as I go. My best guess could be

    hydraulic lines
    Some sort of wiring issue/ground.

    I plan on replacing those items as well, but sick of dumping money in this project right now.

    Has anyone had an issue similar to this?
    Any help would be appreciated

  2. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    Sound like a hand control circuit board might have gone bad. But with out being there and running some test its hard to say

    Have you tried a different controller to rule that out
  3. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 752

    Try a different controller.
  4. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    One test you can do to rule out the controler if don't have one switch the wires left to right coils Then if goes to left and locks then has to be the controller
  5. weav41

    weav41 Junior Member
    Messages: 4

    Ok reversed the s2 and s3 wiring, and still locked up no movement.
  6. quigleysiding

    quigleysiding PlowSite.com Addict
    Messages: 1,129

    My friends was doing the same thing. We switched with mine worked fine. Put his back worked for a few minutes then locked up again. He ordered a new one havent talked to him lately so I assume its fixed. Do you have a friend you can switch with.
  7. myzx6

    myzx6 Member
    Messages: 90

    Start with the basics. I have an sehp and my plow will do this same thing from time to time. Clean the truck and plow side connectors, very carefully spread the male terminals slightly, add fresh dielectric grease and you should be good to go. When its locked right try wiggling the connector and or reposisitioning it and I'm sure it'll work normal for atleast a few seconds
  8. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    same side the right side or did it changed to the left
  9. weav41

    weav41 Junior Member
    Messages: 4

    Switched them around, still was locked up no movement.
    I noticed that if I jacked the blade up with a floor jack, and kept it hanging off the ground. It would work fine, but when the blade was dropped to ground height it would lock up to the right again. I don't know, this is starting to make my head hurt.
  10. myzx6

    myzx6 Member
    Messages: 90

    Wiggle wiring, definitely a bad connection or loose ground somewhere
  11. weav41

    weav41 Junior Member
    Messages: 4

    Took it to the shop today. Told me something wasn't connected to the plug. It seems fixed as of right now. Thanks to everyone for all the help really appreciate it!!
  12. myzx6

    myzx6 Member
    Messages: 90

    Something wasn't connected to the plug, or something wasn't making contact at the plug??
  13. justme-

    justme- 2000 Club Member
    Messages: 2,138

    When the ground to the motor sol was left off changing a battery I had a very similar issue... until the sol contacts melted through the housing that is.
  14. donduck

    donduck Junior Member
    Messages: 11

    My plow did the exact same thing 2 nights ago! So are you guys saying it a wiring problem? I checked all the connections on the plow and controller but didn't see anything out of place, I recheck. What else should I look for?