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Subject: 1954 NAA Hydraulic Problem

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Steve Diehl    Posted 02-19-2019 at 10:44:09 [URL] [DELETE]        [Reply] [Email]  
  • 1954 NAA Hydraulic Problem
  • I have had this tractor since 1981 and it came with a heavy plow on the front that is raised by a cable going back to the arms on the 3pt hitch. I use it for plowing snow and it is getting weak. When I first start it it works OK lifting the plow but after 20 minutes or so it gets progressively weak and then stops being able to lift. I can let it sit for a few hours or more and it repeats the same scenario. The weather here lately has been mostly around in the 20's along with down to zero or below. I have an old shop manual and am going to remove the PTO shift cover to look for turbulence around the relief valve or leaks. Next step will be to check the hydraulics pressure at the lift cover plug. Already borrowed a 10,000 PSI gauge and fittings. Per the manual, it should be around 2000 PSI and if it drops within 10 seconds will need to replace pump. I am looking for any advice and also recommendations where to go for a new pump and whatever else is needed. I believe it is still the old vane type now.

    JMOR    Posted 02-19-2019 at 15:59:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1954 NAA Hydraulic Problem
  • In addition to info that TOH provided, note that the pressure which you measure is proportional to the load being lifted. You should only see max pressure if load is too heavy to lift or if you chain the lift arms down.

    Steve Diehl    Posted 02-20-2019 at 04:07:26 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1954 NAA Hydraulic Problem
  • Thanks JMOR, I also saw that in the shop manual.

    TheOldHokie    Posted 02-19-2019 at 12:24:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1954 NAA Hydraulic Problem
  • A common scenario for these tractors. The most likely culprits are a leaking lift cylinder and/or a worn pump. In both cases the offending component starts to bypass pressure when the oil temperature increases and viscosity drops. Generally the relief valve wouldn't exhibit this behavior - it would leak more when the oil is cold and pressure is higher. The lift cylinder is by far the cheapest to fix. Pump replacement/overhaul is relatively expensive.

    TOH

    Steve    Posted 02-19-2019 at 14:47:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1954 NAA Hydraulic Problem
  • TOH,
    I was thinking the same thing. Are there rebuild parts for the old vane pumps?
    Thanks,
    Steve

    TheOldHokie    Posted 02-19-2019 at 15:53:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1954 NAA Hydraulic Problem
  • Rebuild kits for the vane pump have recently come on the market priced around $375. I have no experience or third party reports on how well they work. I would guess a lot depends on how badly worn your pump is.

    I started making these a few years ago to address the issue of worn out vane pumps. They are hot sellers and I have a long waiting list:

    Gear Pump Conversions

    TOH

    Steve Diehl    Posted 02-20-2019 at 04:28:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1954 NAA Hydraulic Problem
  • Thanks TOH, I am glad to hear there are other options available. I am waiting for the weather to warm up a little in the next couple of days to finish checking out my tractor. I am guessing the backlog lead time for the gear pump conversion is dependent on how soon you get more cores, correct?

    TheOldHokie    Posted 02-20-2019 at 06:20:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1954 NAA Hydraulic Problem
  • The backlog is dependent on finding time to work on them. In the absence of good used cores I use new aftermarket housings and gears which is the basis for the core prices. Right now I have four sitting on the bench waiting for me. Plus I have a bunch of folks waiting on sleeve tools. I simply have more work than time.

    TOH

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