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angle issues with old Fisher speed cast

Discussion in 'Truck & Equipment Repair' started by splithair, Mar 22, 2014.

  1. splithair

    splithair Junior Member
    Messages: 12

    I have an old Fisher Speed Cast, belt driven, hydraulic plow on my old yard truck that I am having trouble with. The plow raises but cannot be angled with the controls and I can angle the plow by pushing it by hand. It doesn't hold an angle of course. It stopped functioning when I was pushing some very heavy snow piled up high at the end of my neighbors driveway (this seems to be what happens when I am a good Samaritan). I hit the bank pretty hard to get it moving and pushed up over the bank. I also had just replaced a hose that had gone south on me and I had a bit of a leak at another coupling (since repaired). Could this combination of things gotten the angle hydraulic system air-locked? and if so how do I bleed this thing. I am stumped.
  2. jhenderson9196

    jhenderson9196 Senior Member
    Messages: 615

    It should bleed through use. You may have damaged the relief valve for the angle function.
  3. splithair

    splithair Junior Member
    Messages: 12

    Do you know where the relief valve lives? My first guess is that it is in the control valve but I just don't have any experience working with hydraulics. I might be able to figure it out if I could find an exploded diagram of the control valve but they seem pretty scarce on the internet, I can't find any. Does anyone have any ideas where to find one? Thanks in advance.
  4. quigleysiding

    quigleysiding PlowSite.com Addict
    Messages: 1,129

  5. splithair

    splithair Junior Member
    Messages: 12

    Thanks for the link. Unfortunately the guide for the under hood hydraulic system offers little guidance. There is a troubleshooting guide but no exploded diagram. The guidance from the troubleshooting guide has three suggested issues. Out of adjustment control cable, un-centered control lever and bad o-rings on the crossover cartridge. The control cables seem fine and the control lever is centered properly. I think I understand what part is considered the crossover cartridge (the cartridge that can be pulled out of the uppermost portion of the valve control) and the o-rings are not flat, cracked or damaged in any way that I can see. I will replace the o-rings today anyway but I am not hopeful it will change much since they look fine. Anybody out there have any other insights?