Welcome to the Hatteras Owners Forum & Gallery. Sign Up or Login

Enter partial or full part description to search the Hatteras/Cabo parts catalog (for example: breaker or gauge)
+ Reply to Thread
Page 2 of 3 FirstFirst 1 2 3 LastLast
Results 11 to 20 of 22
  1. 11-20-2012 07:43 AM #11
    micky
    micky is offline Senior Member
    Join Date
    Apr 2005
    Posts
    266

    Re: Twin Disk M-506 oil pressure UPDATE!!!!

    Control valve was stuck and pump is bad.
    Reply With Quote Reply With Quote
  2. 11-25-2012 05:17 PM #12
    micky
    micky is offline Senior Member
    Join Date
    Apr 2005
    Posts
    266

    Re: Twin Disk M-506 oil pressure

    So I installed the new pump and now the pressure fluctuates all the time between 150-180, if I engage forward it goes down to 90 and comes back to 130-150, if I hit reverse the pressure goes to 0 so I suppose the transmission is coming out
    Reply With Quote Reply With Quote
  3. 11-25-2012 05:35 PM #13
    rmatt's Avatar
    rmatt
    rmatt is offline Senior Member
    Join Date
    Dec 2011
    Posts
    172
    Images
    9

    Re: Twin Disk M-506 oil pressure

    How did you determine the pump was bad? I would look at the releif valve. Sounds like the spring maybe stuck or broke. You did check that the cable was pulling the shift lever all the way into gear?
    Bob
    "CRAZY HORSE"
    Reply With Quote Reply With Quote
  4. 11-25-2012 06:21 PM #14
    micky
    micky is offline Senior Member
    Join Date
    Apr 2005
    Posts
    266

    Re: Twin Disk M-506 oil pressure

    Quote Originally Posted by rmatt View Post
    How did you determine the pump was bad? I would look at the releif valve. Sounds like the spring maybe stuck or broke. You did check that the cable was pulling the shift lever all the way into gear?
    I opened the pump and there was a lot of play on the gears inside of the pump so I ordered one. Also by changing the pump it went from 90 lbs all the time to 150-180 lbs. I also looked at the relief valve and it was stuck I also fixed that. Yes the cable is fulling the shift lever all the way into gear.
    Reply With Quote Reply With Quote
  5. 11-26-2012 10:31 AM #15
    rmatt's Avatar
    rmatt
    rmatt is offline Senior Member
    Join Date
    Dec 2011
    Posts
    172
    Images
    9

    Re: Twin Disk M-506 oil pressure

    I went back and reread your original post. Since you had the boat did the gear ever make acceptable pressure? When you examined the stuck valve did you just free it up or did you dissemble it? If you dissembled it was there a shim or shims below the spring?
    Bob
    "CRAZY HORSE"
    Reply With Quote Reply With Quote
  6. 11-26-2012 06:59 PM #16
    micky
    micky is offline Senior Member
    Join Date
    Apr 2005
    Posts
    266

    Re: Twin Disk M-506 oil pressure

    I just free it up.
    Reply With Quote Reply With Quote
  7. 11-26-2012 07:45 PM #17
    rmatt's Avatar
    rmatt
    rmatt is offline Senior Member
    Join Date
    Dec 2011
    Posts
    172
    Images
    9

    Re: Twin Disk M-506 oil pressure

    You need to pull it apart. The spring could be broken. Any chance someone else tried to fix this before you got it? If you want a breakdown of the valve, pm me with your email and I'll send it to you.
    Bob
    "CRAZY HORSE"
    Reply With Quote Reply With Quote
  8. 11-26-2012 08:13 PM #18
    micky
    micky is offline Senior Member
    Join Date
    Apr 2005
    Posts
    266

    Re: Twin Disk M-506 oil pressure

    I have no idea if someone tried to fix it before. I found a thread here from the previous owner asking about the low pressure and everyone told him to check the screen filter. Nothing more.
    Reply With Quote Reply With Quote
  9. 11-26-2012 08:13 PM #19
    micky
    micky is offline Senior Member
    Join Date
    Apr 2005
    Posts
    266

    Re: Twin Disk M-506 oil pressure

    PM sent.
    Reply With Quote Reply With Quote
  10. 11-27-2012 10:08 PM #20
    fissioneng's Avatar
    fissioneng
    fissioneng is offline Senior Member
    Join Date
    Apr 2007
    Posts
    1,160

    Re: Twin Disk M-506 oil pressure

    Quote Originally Posted by captddis View Post
    You are checking the oil level while idiling right? Are they manual gauges? Most Twin Disc gears run 300 to 400lbs of pressure.
    Just replaced my senders and gauges along with the screens. Mine run above 350 psi.

    Could there be a restriction in the tube to the gauge?
    Looking for another boat...not a Hatt
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules