single axle drive with tag/pusher axle

Discussion in 'Trucks [ Eighteen Wheelers ]' started by lastgoodusername, Mar 20, 2009.

  1. T800H

    T800H Medium Load Member

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    Apr 2, 2010
    The Keys
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    Yes Rockwell and Eaton both make full lockers single axle, weight saving will probably be (my guess) 500 lbs.
     
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  3. 98989

    98989 Road Train Member

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    more more here in europe single drive with tag axle with single tires on tag is 500-600kg(1100-1300lbs) lighter than lightest 6x4
     
  4. Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    I do not know why but pusher axes are populat in UK, in Europe tag axe (lift) axe are more popular.

    Pusher axe is of exotic designe becouse of driveshaft.

    So just swap rear axes, remove differenttial and semi axes from rear axe and add ABS valve to rear air springs to dump air for traction help (with small button inside cabine). Lift axe is more expencive project. additional air bag to lift axe, more complicated valves.. easier to put 6x2 ecas system to controll all valves...
     
  5. Smalltruck

    Smalltruck Light Load Member

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    Here in Minnesota it's not illegal to have a control to lift the axle in the cab. If you do though the axle has to come off the ground. You can't regulate air pressure from the drivers seat. If they see you lift the axle loaded on the road you will get a ticket.
     
  6. Pablo-UA

    Pablo-UA Road Train Member

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    wabco makes pressure switches to block lifting axe laden.

    Why do I offer use ABS valve? hah! you drop pressure in lift axe springs but you do not actuate lift air bag and axe is on road. Levelleng valve adds air to drive axe and clearance is normal.

    Our drivers use ABS valves as controlled from cabine dump valves for weight controll cheating.
     
  7. 98989

    98989 Road Train Member

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    @pablo-ua you have private message
     
  8. Cowpie1

    Cowpie1 Road Train Member

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    I read up on some of doing the pusher axle idea. From what I got from various sources, it is best to use a 25K rated drive axle because of torque issues when you use lockers, and because you will be able to put a full 20K on the drive axle with the pusher lifted and it would handle the road abuse better in that situation.

    I checked with a local shop in my area that does a lot of axle, tranny, and engine rebuilds about doing a single drive with a lift pusher. I got a quote for putting a rebuilt 25k drive axle with lockers and a 20K liftable pusher on the truck for roughly $5000 -$6000 counting the trade in for my current two axles. It would save a lot of weight, the lack of having to turn gears in another drive axle would be fuel saving, and lifting the pusher on light loads or bobtailing would save even more.

    As for an actual ROI, that would be hard to tell and would depend on a person's operation. I would think it would only be truly cost effective for someone pulling light a lot, or if they are keeping their truck for a long time and would end up changing out or rebuilding axles anyway. I plan to keep mine for a considerable time so it would probably work for me and is the route I plan to go.
     
  9. lastgoodusername

    lastgoodusername Medium Load Member

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    fixing to do mine in jan. have the driveshafts already and waiting to order the axle closer to the first of the year.
     
  10. Mainframe

    Mainframe Light Load Member

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    beloit, wi
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    Hey Rick G. I wonder if that includes local dumpers. I'm from Wisconsin, we have tags and/or pushers on lot of our trucks. If you try to turn a corner in a loade truck with the tags down, you won't go anywhere but forward and never make the corner. We are allowed to raise the axles to make the corner, then put them down immediately after and you are on the straight again. Even the Staties leave us alone.
    While you are in an overload condition for a short time, it sure beats mowing through a line of waiting cars at a stoplight and plowing into the gas station (like one of our freshly hired i-know-everything idiots did).
     
  11. Pablo-UA

    Pablo-UA Road Train Member

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    lock differentials and front wheels will skid and no turn))) hah!

    Some ECAS systems do not let raise lift axe with full load more then for 30 sec, and down lift axe at 10-15 mph. these parameters are programmable. ECAS is rare system in the USA, they offer ECAS on new trucks as option.
     
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