Heavy Equipment Forums Heavy Equipment Community

420D Torque Specs

Long0 · 2024-06-25 20:26

I’m hoping someone has access to and can provide me a couple torque specs on this tractor. BLN05998 Front axle yoke nut - it was damn tight when I took it off Oil pan bolts Harmonic balancer bolts Appreciate any help Andy

Replies6
  1. #1Nige2024-06-26 09:35

    Front axle yoke nut - ref #6 in the photo.? Oil pan bolts - 16 ft lb. Harmonic balancer bolts - If you mean the three bolts then 85 ft lb.

  2. #2Long02024-06-26 20:21

    Thanks Nige Actually, looking for the yoke nut for the front drive line Yup, three balancer bolts. Thats a lot for those little guys. Thanks again Andy

  3. #3edgephoto2024-06-26 20:33

    That nut is not really torqued in the usual fashion. There is a collapsible spacer between the outer and inner pinion bearings. The yoke nut is torqued until you get a certain rotating torque spec. In chassis like that will require a different method so as to not over crush that spacer and burn up the bearings. since you can't measure the rotating torque with the axle assembled.

  4. #4Nige2024-06-27 05:08

    330 ft lbs, provided that you have not interfered in any way with the bearing, etc, settings. If you have then you will need to go through the complete adjustment process for the pinion bearings, which, as @edgephoto mentioned above, is complicated. TBH the best thing you could have done would have been to mark the position of the nut before removing it and install it back to that same position on re-tightening.

  5. #5edgephoto2024-06-27 10:03

    Over-tightening that nut and putting to much load on the bearings is worse than if it is a hair loose. Typically there is a torque range you would work in. You start at the low range, measure the turning torque and keep tightening the nut until you achieve the right turning torque. If you go past the correct turning torque you start over with a new crush sleeve. If it was me I would torque to the lowest number in the range and call it done. These nuts usually are lock nuts or have a way to lock them in place by staking or a cotter pin. If you are reusing the nut put a bit of blue Loctite thread locker on it. One drop is enough. Do not use red.

  6. #6Long02024-06-28 08:45

    Good info - thanks guys For as little as this tractor gets used, I think my best approach is to snug it up good with some blue on it and call it a day. Andy