Page 1 of 2 12 LastLast
Results 1 to 10 of 14
  1. #1

    Join Date
    Jan 2004
    Posts
    83
    Location
    Brimfield Ma
    Tractor
    Jinma 354

    Default pump rebuild

    I have a Jinma with a bad pump. it had metal shavings in it. it was'nt factory debured. so I cleaned it up debured it got it to spin easily but it dos'nt pump any oil. I cleaned the filter,flushed the tank made sure all the lines are clear and connected. The drive spline is good and the impellers turn. any ideas?

  2. #2

    Join Date
    Jul 2003
    Posts
    74
    Location
    Ladysmith, Va. USA
    Tractor
    Massey Ferguson 4225

    Default Re: pump rebuild

    Alpha, I'm sorry to tell you this, but most likely the pump is trashed. The metal filings probably galled the housing and ruined the seal between the impellers and the housing. No seal, no pumping oil. Without tight clearance, the pump cannot make enough vacuum to prime itself or if it did manage to pickup some oil, there would not be enough pressure to do any work.

    The clearances inside the pump are very tight and it doesnt take much damage to ruin a hydraulic pump of any kind.

    Make sure you get all of the shavings out of the sump before you install a new pump, or you will be doing this again. [img]/forums/images/graemlins/frown.gif[/img]

    Sorry for the bad news, hope I'm wrong.

    Nailerguy

  3. #3
    Elite Member
    Join Date
    Mar 2002
    Posts
    3,824

    Default Re: pump rebuild

    I'm not familiar with your pump, don't even know if you are talking about an oil pump or a hydraulic pump, but are you priming it, filling with oil, before installing or hooking up lines and testing?

  4. #4

    Join Date
    Jan 2004
    Posts
    83
    Location
    Brimfield Ma
    Tractor
    Jinma 354

    Default Re: pump rebuild

    yea sorry its a hyd. pump. Ive flushed the whole system with kerosene. tried priming the pump, still dead must have killed it? now that the system is cleaned filter too I will get a new pump and try that.

  5. #5
    Super Member SPIKER's Avatar
    Join Date
    Jun 2002
    Posts
    5,000
    Location
    Ohio, Jeromesville, Ashland County
    Tractor
    Jinma 284

    Default Re: pump rebuild

    ALPHA sorry to hear it, I know JINMAs have a few different pumps so make sure you get right one. use the #'s and match em up, I know that http://www.jinmaparts.com can get you one, (I think that is right) or try your'de local dealer") also try PUMA machine. http://www.puma-machinery.com/pages/810877/index.htm

    they carry them too.

    Mark M [img]/forums/images/graemlins/ooo.gif[/img]

  6. #6
    Veteran Member
    Join Date
    Feb 2002
    Posts
    1,055
    Location
    WVa
    Tractor
    Kubota L3710, Ford 5600, Case MB4/94, Kubota B6200

    Default Re: pump rebuild

    If the original pump was incorrectly manufactured, what makes you think a new one would be any better? Call the shops that rebuild hydraulic cylinders and pumps in your area. Many shops have a Blanchard grinder that they can use to restore the proper internal clearances in a pump. That would be my first choice especially with a foreign built pump.

    Beats taking a chance on a new pump that may have the same internal defects as the original. If you're dead set on a new pump, try to get one that was manufactured recently. Maybe a later built part will have been put together correctly.

  7. #7
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,224
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: pump rebuild

    alpha,
    Maybe JohnS will speak up, he is very familiar with the Jinmas. I believe that I recall him saying the pump was very inexpensive. Here is his web site, it has lots of stuff about Jinmas. Johns Web Site

  8. #8
    Elite Member
    Join Date
    Mar 2002
    Posts
    3,824

    Default Re: pump rebuild

    I can't help but think you may have some other problem. It seems to me that unless there is an obvious visual flaw in the pump it should at least pump "some" oil; However, as someone suggested, if the pumps are inexpensive.......

  9. #9
    Super Member SPIKER's Avatar
    Join Date
    Jun 2002
    Posts
    5,000
    Location
    Ohio, Jeromesville, Ashland County
    Tractor
    Jinma 284

    Default Re: pump rebuild

    OH I forgot to mention that back when the CTOA was a better (read easier to find stuff) site there was a problem with a few different pump, mostly all was assoiated with the fact that someone disconnected the pump hose QD and that would blow the pump seals and dump hyd fluid into the oil. there was one or two otehr posts that had pump shaft had sheared off and was doing the same as you discribed. you said the key was ok, that was one issue I rembmber (note those are a few eyars worth of remembering so I don't have any details.)

    Mark [img]/forums/images/graemlins/ooo.gif[/img]
    Attached Images Attached Images

  10. #10

    Join Date
    Jan 2004
    Posts
    83
    Location
    Brimfield Ma
    Tractor
    Jinma 354

    Default Re: pump rebuild

    well I got a new pump and all is well. [img]/forums/images/graemlins/grin.gif[/img]

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2016 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.