axle interlock

Discussion in 'Trucks [ Eighteen Wheelers ]' started by chrisut, Mar 19, 2013.

  1. SmokinCAT

    SmokinCAT Road Train Member

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    The slip sleeve is the power divider, when you engage it it allows power to travel into the front gear set, the rear is still being driven at the same time by the thru shaft. On a sqhd it does exactly what you said it unlocks.

    In this link you can look at the slide collar #33. When you engage the power divider it slides forward and meshes with the thru shaft and the idler gear #22 which drives the pinion of the front rear, now unlock the power divider and the collar moves back on the shaft loosing contact with the gears. So now how would any power get to the front rear end? The SQHD is the only series like this, and thus the exception to the first post, in the SQHD's case when the divider is unlocked power can only be sent to either of the two wheels on the rear axle, not any of the four like the first post implied.

    http://www.worldamerican.com/Catalogs/hd_diff_tran_pieces/SQHD_FORWARD.pdf
     
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  3. SmokinCAT

    SmokinCAT Road Train Member

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    This is the part that is not correct for the SQHD, and the only reason I brought them up. I just copy and pasted from the second post.

    A common misconception is that the front differential receives no power unless the power divider is "engaged". This is completely false. All four wheel ends receive power regardless if the interaxle is locked or not.
     
  4. Quickfarms

    Quickfarms Heavy Load Member

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    I have a 10 wheel drive truck that does that when it is empty. It is kind of embarrassing if you forget to either engage the power divider or the front axle and the truck has detroits in each axle.
     
  5. Hammer166

    Hammer166 Crusty Information Officer

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    That drawing doesn't show the power divider. Here's the original of that drawing: https://s3.amazonaws.com/helm-arm-lod/pb9424.pdf

    Page 17 is the one you posted. Look at page 21. It's labeled SL/SQHD Interaxle differential assy. The locking sleeve you point out is the power divider lock. #26 on pg 21 drives the front rear from the rear side gear #15, and the thru shaft passes thru #26 to #14, the front side gear. The lockout sleeve merely locks the two shafts together, effectively locking the spider gears in place, and causing the whole divider to turn as a single assembly, thus eliminating any differential action.
     
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  6. SmokinCAT

    SmokinCAT Road Train Member

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    Gotcha, I was unable to see the further most gear, even with the rear out and the front assembly unbolted. So the spiders are there to allow slip? And then the collar compacts the clutches and spiders to lock all together?
     
  7. SmokinCAT

    SmokinCAT Road Train Member

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    Now while I got you here, could you possibly explain why my SQHP's in my KW use the housing any layout as a SQHD, but are listed in the with SQ100's.
     
  8. snowman_w900

    snowman_w900 Road Train Member

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    well....after i read i wrote, i must correct myself. i said that inter-axle lock was the same as powerdivider. after looking at the dash of my kenworth this morning, i realized it said"internal axle lock" three little letters made a difference in my statment. dont know why i didnt catch that. my power divider is on a switch next to it. the internal axle lock is for the rear rear only.

    also, hammer i never did disagree with you on how a power divider works. i was just using the rt20-145 as example and to see what youd say.also, to prove your point further,i had a set of spicer n400 rears that when the spider cross broke in the power divider, the truck wouldnt even move. had to get it on a hook and go home.

    as far as the old rockwell. i'm with cody....i thought the only way to actullay transfer power to that sq series was to lock the collar on the thrushaft to sent power to the big gear on the pinion though? not sayin ALL of them were that way.

    but i do have a question though....when someone mentions a "full screw" what are they refering to?
     
  9. Hammer166

    Hammer166 Crusty Information Officer

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    It doesn't compact them, it locks the thru shaft to the drive gear for the front diff. More or less the same way gears are locked to mainshaft in tranny.

    Yes, the spiders work just like they do in a rear. The difference being the outputs both exit in the same direction, and the carrier is driven along the same axis, rather than by a pinion.

    From Tapatalk- for when you're really addicted.
     
  10. melpromud

    melpromud Medium Load Member

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    A lot of big companies do this to make the trucks "dummy proof". This way the rookies don't tear the power divider apart by locking it with spinning wheels. Instead of teaching them how and when to use it they just eliminate it. US Express did this to most of their trucks for a while. The lock was still their on the rear end. It just needed an air line and a switch for it to work.
     
  11. chrisut

    chrisut Bobtail Member

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    I raised the bed on my truck, and it looks like I do have the rear that has the interlock so I am in luck. thanks for the discussion
     
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