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Subject: Torque Value Hydraulic Pump Bolts

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Gregg    Posted 11-21-2019 at 12:40:58 [URL] [DELETE]        [Reply] [No Email]  
  • Torque Value Hydraulic Pump Bolts
  • I have looked extensively trying to find the specified torque value for the bolts which hold the hydraulic pump to the body of my 1950 8N tractor.I cant seem to find it.Does anyone happen to know?

    Tim Daley(MI)    Posted 11-22-2019 at 05:18:49 [URL] [DELETE]        [Reply] [No Email]  
  • TORQUE CHART VALUES
  • Gregg-
    As I said earlier, you can always check in the HOW-TO's forum for information to use. Here's a torque chart from the MISC category - SEE LINK.

    Tim Daley(MI)


    Farmer Dan    Posted 11-21-2019 at 16:43:44 [URL] [DELETE]        [Reply] [Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • I have a pdf copy of the FO4 that is 144 pages. Shoot me an email if you would like a copy.

    R Geiger    Posted 11-21-2019 at 12:56:19 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • According to my FO-4 they are torqued to 53-60 foot pounds. page 99

    Gregg    Posted 11-21-2019 at 13:13:05 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • Thank you sir, I had run across a value similar in a forum but that seemed high considering the cast aluminum pump.I must admit, I am a little confused.I only have a digital copy of the ITFO-4, my copy ends at page 39.Maybe I dont have all of it? I looked at paragraph 99 but it discusses the quadrant.

    Tim Daley(MI)    Posted 11-21-2019 at 14:27:28 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • HiYa Gregg-
    First, torque is calculated by fastener size and material, not the material it is fastened to or with. Next, the I&T FO-4 Manual (and any others) vary with page numbers depending on which version you have. My Page 99 also has the info as stated - 53-60 ft/lbs for the bolt retaining cap screws. Here is my page 99 scan. If you can't read it, save it to your PC and magnify. Many folks don't understand torque. There are several different values: in/oz; in/lbs; ft/lbs; Newton Meters; and Newton-Kilograms. You need to know what your wrench scale is set at and how to convert if needed. Torque is correctly achieved in three steps. Take absolute value required, and divide by 3. First step at lowest value, 2nd step at mid value, and final setting at required value. Use the proper sequence for each step. Always turn ratchet thimble in the forward direction, starting a few turns below setting and increase to the required setting, then lock in. Do not go beyond and try to reverse setting without going back a few turns -this takes out any backlash in the lead screw. Never use a torque wrench for loosening a fastener. FORD Part Number for the pump to center housing is 355693-S, 7/16-14 x 1-3/8 which is equivalent to a standard Grade 7 steel bolt.


    Tim Daley(MI)

    TheOldHokie    Posted 11-21-2019 at 18:12:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • "First, torque is calculated by fastener size and material, not the material it is fastened to or with."

    Fastener tightening torque is properly calculated using the yield strengths of the material used for BOTH the male AND female parts as well as length of thread engagement. The reason for that should be obvious. Here is a good engineering calculator for doing that - note the number and types of inputs required:

    Fastener Torque Calculator

    Formulas that use only bolt diameter and material are general purpose approximations and assume a lot. Using them in a situation to which they don't apply (e.g. 160 KSI steel bolt screwed into 40 KSI aluminum) is a recipe for thread failure.

    TOH

    r geiger    Posted 11-21-2019 at 13:58:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • The pump is alum but the bolts are going in to the steel cast housing. There are different versions of the FO-4 mine is 152 pages long. installing pump is paragraph 161.
    If in doubt, you an always look up the standard torque value for any bolt size and grade.

    Gregg    Posted 11-21-2019 at 15:20:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • Thank you gentlemen for your help.Learned some things with your paragraph on torque Mr. Daley, never knew not to use my torque wrench to loosen bolts.After collecting parts to repair calcium chloride damage incurred in decades of sitting in my grandfathers barn and procrastinating a long while.After taking a bath in diesel, gasoline and seventy year old hydraulic sump tar/coal slag, my family heirloom is finally clean and going back together.Some of you may laugh, but it has been five years since I pulled it home, hopefully this is the last of 500 steps, revamping her.I am slow but meticulous and persistent.She is amazing in that she sat all those decades,she fired right up after going through the oiling, firing and carb, doesn't even smoke.

    Tim Daley(MI)    Posted 11-21-2019 at 16:47:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • HiYa Gregg-
    The NTC has many documents to download for free to assist in repairs and DIY projects. Here is one (SEE LINK) on the 8N hydraulic pump repair. A total hydraulic pump rebuild may be your best bet if it is as dirty as you say. The I&T FO-4 Manual is supplied by CLYMER now and new copies available at www.just8ns.com. They also will have new parts for the pump.


    Tim *PloughNman* Daley(MI)

    *9N653I* & *8NI55I3*

    Gregg    Posted 11-21-2019 at 17:34:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • The pump was working when I pulled it out.It would lift the arms easily but would not go back down.I changed the relief valve/safety valve and got the intake and exhaust valves on the pump cleaned up and moving again.With the pump out the lift arms pushed back down and old hydraulic fluid came out of the lift piston.I assume and hope, the stuck exhaust valve was keeping it up.As you probably know, the valves are in the lowest point, all that "tar/coal slag" had collected there.Now that all of it is gone I am hoping it will be good for a while.I am however,considering pulling the top cover this spring and replacing the piston with the improved NAA piston.

    Gregg    Posted 11-21-2019 at 18:17:08 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Torque Value Hydraulic Pump Bolts
  • I would like to add something that probably will make some of you smile because have been there, done that.All this sump and pump work was part of a snowball deal, before I realized I had a hydraulic pump valve issue.I looked at the right axle trumpet, the brake backing plate, the right brake rod and saw damage from thirty years in a barn with calcium chloride dripping out of a bad tire valve.It is all interconnected so I find myself doing it all while the sump is empty.

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