2016 x738 grease zerk thread size?
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    2016 x738 grease zerk thread size?

    After installing front fenders cannot get to one of my grease zerk with the grease gun. I want to replace the straight zerk with a 45. I tried a 1/4-28 and it is not correct. So I assume it is metric.
    Attached Thumbnails Attached Thumbnails IMG_20170822_074426004.jpg

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    jgayman's Avatar
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    It is currently one of these: CH15805 However, JD Parts does not give any detail on that fitting.

    45-degree zerk: M802010

    Specification
    Weight: 0.02 LBS 0.01 Kg
    Fitting Angle 45
    Thread Diameter 6.000 MM
    Thread Pitch 0.750 MM
    Thread Length 4.500 MM
    Overall Height 23.500 MM
    Width Across Flats 9.000 MM
    Material 5.8
    Finish
    Note
    Last edited by jgayman; 08-22-2017 at 09:33 AM.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    tj1
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    Quote Originally Posted by jgayman View Post
    It should be one of these: M802010

    Specification
    Weight: 0.02 LBS 0.01 Kg
    Fitting Angle 45
    Thread Diameter 6.000 MM
    Thread Pitch 0.750 MM
    Thread Length 4.500 MM
    Overall Height 23.500 MM
    Width Across Flats 9.000 MM
    Material 5.8
    Finish
    Note
    Mike is always a good one to get great information out there...
    Jeff

    X 738 4X4/ 54" mower deck, 47" two stage snow thrower/ linear actuator spout control, Curtis hard side cab/heater, JD roof top LED work lights, Curtis fuse block, rear roof light connected to dash light switch and reverse lights, additional 20amp alternator, Curtis fast Cast 2000 sander custom fitted to tractor/ vibrator for use with dry sand, Kubota L39 TLB, JD 450 E dozer, Husky 18 horse/ 48" mower deck/Berco 42" two stage snow thrower/Berco soft side cab, Kubota RTV500-H.

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    There are two different 1/4-28 sizes. 1/4-28 taper thread (SAE-LT) and 1/4-28 straight UNF2A. I'm almost certain this is the 1/4-28 taper thread. The 0 degree is JD7844, the 45 degree is JD7788 and the 90 degree is JD7806.

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    jgayman's Avatar
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    Quote Originally Posted by ExperimentalMechanic View Post
    There are two different 1/4-28 sizes. 1/4-28 taper thread (SAE-LT) and 1/4-28 straight UNF2A. I'm almost certain this is the 1/4-28 taper thread. The 0 degree is JD7844, the 45 degree is JD7788 and the 90 degree is JD7806.
    Since he removed the original zerk wouldn't it be easy to look at the threads and tell if it is straight or taper?

    Click image for larger version.

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    TAPER


    Click image for larger version.

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ID:	436586
    STRAIGHT
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    Current production units don't even have grease zerks anymore so apparently they aren't even needed.

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    bloodrunsgreen's Avatar
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    Just another way to make the tractor wear out and sell another. They weren't making enough on the sale of a tractor once every 30 years, they want you to get one every 5 years.

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    jgayman's Avatar
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    Quote Originally Posted by ExperimentalMechanic View Post
    Current production units don't even have grease zerks anymore so apparently they aren't even needed.
    Sure, why grease when you can replace tie rod ends instead. :-) It seems with each new model they delete more and more grease points. Believe me, it is not because they aren't needed, it's purely a cheap-out cost saving action.

    Compare the number of grease zerks on an old tractor to a new one. All those moving parts still need lubrication.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    I'm going to disagree with you jgayman. The newer joints are sealed units and that's why they don't have grease zerks on them. A lot of shade tree mechanics who grease there own cars wear there joints out prematurely because they put to much grease in them. You're not supposed to put in so much grease that it blows out the seal; you're supposed to put in just enough to make it swell just a little. You blow out the seal and water gets in and that's the end of the joint. Grease doesn't wear out unless it's heated to a temperature that's beyond it's capabilities so in a sealed joint it will last the life of the joint. Old tractors and cars didn't have this technology available to them so lots of grease was the alternative.
    Ron
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    bloodrunsgreen's Avatar
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    Hun, I don't know about the newer units but the steering axle pivot and the wheel spindle arms are just rod and bushing mechanisms so they need grease, rubbing is wear. I have found sealed bearings where the internal part of the bearing was spinning on the spindle shaft and wearing it away. Had to shim it so the bearing would rotate correctly.

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