Another NT-254 hydraulic question. |

This topic has 14 replies, 6 voices, and was last updated 11 years, 9 months ago by smokey44.

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- March 10, 2013 at 10:23 am #30740
  cn8cg
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  I appear to have a air leak on my system. I get large amount of hydraulic oil foam coming out of air vent on return of oil reservoir. My question is: This air must be coming from the suction of the pump, right? It can't be introduced on the pressure side, right? Otherwise, it would leak oil of on the pressure side. I am ignorant on hydraulics. Someone please set me straight.
  
  Jules
- March 10, 2013 at 10:46 am #35820
  Tinbender
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  Correct , or you're low on fluid.
- March 10, 2013 at 2:00 pm #35822
  cn8cg
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  Next question is: Is it much of a job to replace the hydraulic pump?
- March 10, 2013 at 2:33 pm #35823
  RichWaugh
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  Why replace the pump? It is sucking air on the intake side, which is probably happening in the sump, not at the pump itself.
- March 10, 2013 at 4:31 pm #35824
  cn8cg
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  Latest development is that nothing is happening now. No sucking nor any foaming. Just nothing. What else can I do except get a new pump???
- March 10, 2013 at 5:18 pm #35826
  RichWaugh
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  Have you checked the hydraulic fluid level in the sump?
  
  The starting point is always to diagnose the issue. Check the fluid level, also check the level of oil in the engine sump – there are times when a hydraulic pump blows a seal and dumps the hydraulic fluid into the engine sump. Something to check.
  
  If you have a FEL, and it is equipped with quick disconnect fittings on the hoses, disconnect the FEL hoses and then reconnect the hoses from the pump to each other. Also connect the hoses from the FEL to each other to prevent losing fluid. Absolutely do NOT run the tractor with the hoses disconnected or you will blowup the pump! Once the FEL is removed from the circuit and the fluid level is correct, try things out again and let us know what the story is then.
  
  Always look for the least dramatic cause of a problem, don't start by replacing a $350 pump yo may not need.
- March 11, 2013 at 9:42 am #35833
  cn8cg
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  My pump is dead. If it died from the gears disintegrating, can I expect metal in my hydraulic system? I'm ordering a pump and can anyone tell me if the pump exchange is difficult? Any cautions? Must the pump be primed somehow?
- March 11, 2013 at 10:01 am #35834
  Tinbender
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  The gears don't disintegrate. Most likely a seal blew out, that would explain the foam.
- March 11, 2013 at 10:10 am #35835
  cn8cg
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  Would that be a seal inside the pump? Hey my friend, I really appreciate you help.
- March 11, 2013 at 10:13 am #35836
  Affordable
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  The seal is on the end where the shaft comes out of the pump, Let us know if we can help you with the new pump or a rebuild kit for yours
  
  The pump has a total of 4- bolts, only 2- of those bolts hold the pump on the tractor the other 2- hold the pump together
  
  Tommy
  
  Affordable Tractor Sales
  
  “Your Jinma Parts Superstore”
  
  http://www.affordabletractorsalesco.com
- March 13, 2013 at 7:20 pm #35840
  cn8cg
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  Thanks Tommy. Jerry told me it might be a good idea to put hydraulic oil in the inlet pipe so that the pump doesn't run dry or for the least amount of time. I intend to do this. I heard a pump can burn up in less than 30 seconds of dry run.
- March 16, 2013 at 10:59 pm #35843
  cn8cg
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  My last question on this thread is, could an air leak in the intake line to the pump cause it to fail?
  
  Jules
- March 18, 2013 at 7:18 am #35858
  cn8cg
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  And now someone told me it was probably caused by the wrong hydraulic oil. I use “General Purpose” hydraulic oil from Tractor Supply. What is everyone using for hydraulic oil????
- March 18, 2013 at 6:10 pm #35866
  Bob Rooks
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  “General Purpose”?? What does that mean?
  
  What is the ISO rating?
  
  Most everyone uses ISO AW 32 or ISO AW 46 HYDRAULIC OIL.
  
  Not machine oil, R&O oil, or ATF. Universal Tractor Fluid (UTF) is not recommended for straight hydraulic systems. nor is Marvel Mystery Oil.
  
  But to answer your question; Yes, but it would have to be a leak of such magnitude that other symptoms would prevent operation of the system first. These are very inexpensive pumps, and as such are not very forgiving.
  
  Account deleted.
- March 25, 2013 at 6:44 pm #35898
  smokey44
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  I had a little air getting into my system near the hydraulic
  
  screen (filter). I pulled the screen out to check it and noticed
  
  the stem was not screwed up tight against the O ring on the
  
  cap. This screen is located under the left side of the seat. If
  
  you follow the suction line from your hydraulic pump to
  
  under the seat, you see the line attached to a cap with 3
  
  bolts on top of your hydraulic tank. Your screen is under
  
  this cap. Anyway, tightening the stem up took care of my
  
  problem. Smokey
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