Page 4 of 5 FirstFirst 12345 LastLast
Results 31 to 40 of 42
  1. #31
    R.I.P.
    Join Date
    Dec 2008
    Posts
    5,883
    Location
    North Carolina
    Tractor
    Kubota BX2200

    Default Re: Jinma Hydraulic Pump - Failures

    Quote Originally Posted by doxford jim View Post
    Circle D - I think you are on the right track. I did not have the extra direct relief valve installed when I put the 20ml/r pump on. Thinking about it, I am sure that the original system would be marginal at best, but with higher engine RPM, failure would most likely occur quickly. That is what happened in my case I am sure.
    I should mention that when the QD are removed from the pump outlet (pressure side), you will see the hose to the FEL valve block has a smaller internal dia - maybe 5/16" dia at most. The short pump discharge hose has a bigger ID of around 1/2" The relief vales in the valve blocks may not be too efficitient IMO.

    I have since added a 10gpm external relief valve in hyd.pump discharge line and set it to open at 1800psi (18 bar). For what I need the 1800 psi pressure is adequate. I have the hose from the relief valve returning to the hydraulic tank. Set up seems to work well so far. Will try to attach a couple of foto's (taken just a day or two ago) to show what I have done - very similar to what other owners have done also.

    Without the extra relief valve it will become expensive - the external relief valve is essential IMO.

    Cheers

    Jim
    I think you have a small typo...in bar, you are running ~ 125 bar. Just clearing up the typo, the work looks great, and I'm jealous my tractor doesn't have an external relief like yours.
    Which is bigger?: a) $100 per month since the Big Bang or b) the US National Debt.

  2. #32
    Veteran Member Bob Rooks's Avatar
    Join Date
    Feb 2007
    Posts
    2,330
    Location
    Bothell & Silverdale, WA
    Tractor
    Yuchai Bulldozer

    Default Re: Jinma Hydraulic Pump - Failures

    1,800 psig = 124.1056 bar or 122.4827 atmospheres.
    Yuchai 306R dozer, Mustang 2040 skid steer, Mitsubishi MS035 Mini-Ex with four buckets and a rake, 7' Dual Dozer with dual Trimble GCR-2 laser receivers.

  3. #33
    New Member
    Join Date
    Jun 2013
    Posts
    2
    Location
    Ogden, ks
    Tractor
    Jinma 454

    Default Re: Jinma Hydraulic Pump - Failures

    Trying to figure out how the hoses on a Jinma 454 is supposed to run. Installed new pump and need to know if anyone would have a picture to show how to route the lines. Thanks

  4. #34
    Member Cinco's Avatar
    Join Date
    Jun 2009
    Posts
    31
    Location
    West Michigan, On the river or in the woods.
    Tractor
    Jinma 354

    Default Re: Jinma Hydraulic Pump - Failures

    Sounds like several of my problems and questions have been addressed here. I will get a new filter to start, get rid of my quick connects in favor of direct threaded connections, and check for leaks on the intake side that be taking in air. I don't have any leaks coming out that are that noticeable, but may be taking in air and causing some squishness and slow responses to my hydro requests.
    To be sure, I think I only have one location that holds fluid, you fill and check right next to the gear shift lever on top of the transmission. I do not see any other place that may hold fluid. If there is, I sure haven't changed it! Jinma 345 diesel. I think there is a breather at the back behind the seat, but no way to put fluid in there. I will add a pressure gauge to the FEL controls to see what that is reading.
    One quick question, I have a hydro fitting at the back of the tractor near the 3 point. There is only one, what the heck is that for? I would think you need 2 to do anything, one power and one return. What good is one connection? Is there a return somewhere I can not find?

  5. #35
    R.I.P.
    Join Date
    Dec 2008
    Posts
    5,883
    Location
    North Carolina
    Tractor
    Kubota BX2200

    Default

    Quote Originally Posted by Cinco View Post
    One quick question, I have a hydro fitting at the back of the tractor near the 3 point. There is only one, what the heck is that for? I would think you need 2 to do anything, one power and one return. What good is one connection? Is there a return somewhere I can not find?
    My 304 has a quick connect for a dump trailer on the left. I have a similar looking pipe on the right, but that's to drain the fluid. It could be made into a return easily.
    Which is bigger?: a) $100 per month since the Big Bang or b) the US National Debt.

  6. #36
    Platinum Member
    Join Date
    Nov 2008
    Posts
    802
    Location
    US Virgin Islands
    Tractor
    Jinma JM304

    Default Re: Jinma Hydraulic Pump - Failures

    No - that fitting on the transmission is for gear oil, not hydraulic fluid. The hydraulic fluid goes in the lift box, where that breather is. Unscrew it and there's a dipstick. Do NOT put hydraulic fluid in your gear case!

    The single remote is for a dump trailer, power up, gravity down.

  7. #37
    Member Cinco's Avatar
    Join Date
    Jun 2009
    Posts
    31
    Location
    West Michigan, On the river or in the woods.
    Tractor
    Jinma 354

    Default Re: Jinma Hydraulic Pump - Failures

    I spent $2500 last year having the case split to repair busted off shift forks, and the shop put hydraulic in the gear box. They said it ran the whole tractor.
    I might have to go look all this up and do some draining/filling if that is the case.

  8. #38
    Super Star Member Diamondpilot's Avatar
    Join Date
    Jan 2007
    Posts
    15,032
    Location
    Daleville, IN
    Tractor
    Jinma 254/284 Ford 861 Powermaster at work

    Default

    Quote Originally Posted by Cinco View Post
    I spent $2500 last year having the case split to repair busted off shift forks, and the shop put hydraulic in the gear box. They said it ran the whole tractor.
    I might have to go look all this up and do some draining/filling if that is the case.
    The shop has no idea what they were doing. There is a separate hydro reservoir behind the seat.

    Chris

  9. #39
    Elite Member RonMar's Avatar
    Join Date
    May 2005
    Posts
    2,794
    Location
    Port Angeles WA
    Tractor
    Jinma 284 delivered 06/28/05

    Default Re: Jinma Hydraulic Pump - Failures

    Quote Originally Posted by Cinco View Post
    One quick question, I have a hydro fitting at the back of the tractor near the 3 point. There is only one, what the heck is that for? I would think you need 2 to do anything, one power and one return. What good is one connection? Is there a return somewhere I can not find?
    Yep, that single fitting is most likley for a dump trailer. You close the 3PH speed regulating valve, connect the dump trailer hose to that fitting and use the 3PH control lever to raise/dump the trailer with fluid flowing out the fitting to the trailer. When you lower the 3PH control lever, the weight of the trailer forces the fluid back thru the fitting and into the tractor. This is the same as you do to raise and lower the 3PH which is also a single acting cylinder.
    Ron

  10. #40
    Member Cinco's Avatar
    Join Date
    Jun 2009
    Posts
    31
    Location
    West Michigan, On the river or in the woods.
    Tractor
    Jinma 354

    Default Re: Jinma Hydraulic Pump - Failures

    Drained and filled the hydro with fresh fluid and everything works great again. Was not much to drain! Drained the gear case and filled that with all gear oil. It looks like a mix of gear oil and hydro. I should have known something was wrong with that idea, I have a barrel of each sitting in the garage from when I first bought the tractor 5 years ago and did all the changes from the factory gunk. She is running fine and sounds great now. I also had the cooling system apart to replace the lower rad hose and install a hot water heater. A flush and all new fluid with conditioner, and she is staying nice and cool now! I ran it over an hour sitting at a high idle and the needle stayed between 40 and 60 the whole time. My lil Virjinia is happy again.

Page 4 of 5 FirstFirst 12345 LastLast

Similar Threads

  1. Jinma Hydraulic pump problem
    By davesets in forum Parts/Repairs
    Replies: 1
    Last Post: 06-29-2011, 04:04 PM
  2. Oil & Fuel Magnum 18 Fuel Pump Failures
    By GWRdriver in forum Cub Cadet Tractors
    Replies: 8
    Last Post: 06-02-2009, 12:37 PM
  3. Jinma 224 Hydraulic pump question
    By ohiobenz in forum Chinese Tractors
    Replies: 8
    Last Post: 03-24-2009, 10:28 PM
  4. Replacing hydraulic pump on Jinma 454
    By ejtaylor822 in forum Hydraulics
    Replies: 1
    Last Post: 07-17-2005, 09:13 PM
  5. Replacing hydraulic pump on Jinma 454
    By ejtaylor822 in forum Parts/Repairs
    Replies: 1
    Last Post: 07-17-2005, 09:13 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.