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HELP. pwr steering overheating 6NZ in 379

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Jeron379, Nov 22, 2011.

  1. Nov 22, 2011 #1
    Jeron379

    Jeron379 Bobtail Member

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    Aug 15, 2009
    Moncton New Brunswick
    0
    Truck has been through 3 shops so far. Bought it 2mths ago and on the first trip out the pwr steering hose from the resevoir to the pump kinked over and starved the pump. (Truck dealer had installed non oil resistant hose). Replaced the hoses with proper lines. Made it a few days and noticed the lines were getting so hot they melted the plastic sheathing off of them. Not long after the hose let go. Completely cooked. Replaced pwr steering pump and installed new lines next. Made it a week and its puking fluid. Found a shot o ring on the pump. Been bout two wks now and just got a call from the driver its leaking again so I suspect the line is cooked again or the pump fitting o ring.
    Any ideas on what is goin on here??
    Truck is 01 379 6nz.
     
    Jeron379, Nov 22, 2011
    Jeron379, Nov 22, 2011
    #1
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  3. Nov 22, 2011 #2
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    When you have a pump or gear go like that, sadly, you need to replace everything! No matter what you do, if you only replace the pump, metal is still in the gear. If you only replace the gear, metal is in the pump. Metal left over will ultimately make it's way through everything again. Pump and gear needs to be replaced together. Lines have to be removed and flushed, in your case, the proper ones need to be installed. Power steering reservoir needs to be washed out and a new filter installed. Finally, refill with new fluid.
     
    Heavyd, Nov 22, 2011
    Heavyd, Nov 22, 2011
    #2
  4. Nov 22, 2011 #3
    Jeron379

    Jeron379 Bobtail Member

    22
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    Aug 15, 2009
    Moncton New Brunswick
    0
    When we did the pump it got new lines, new filter and fluid.
    When you say gear u mean the steering box also or ?
     
    Jeron379, Nov 22, 2011
    Jeron379, Nov 22, 2011
    #3
  5. Nov 23, 2011 #4
    power freak

    power freak Light Load Member

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    Apr 23, 2009
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    Yes the box is also called the steering gear.
     
    power freak, Nov 23, 2011
    power freak, Nov 23, 2011
    #4
  7. Nov 23, 2011 #5
    The Truckist

    The Truckist Medium Load Member

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    Sep 11, 2010
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    Of course you've figured it out now the hard way but some of those power steering systems, if not ALL of them, require regular filter changes of the power steering fluid. Some are more forgiving than others. You'd be surprised how many drivers had no idea there was even a filter inside the power steering reservoir. What happens...and now you know...the filter gets plugged and all kinds of problems ensue. The heat & elevated pressures will destroy seals and rubber creating more than leaking problems.

    The filters rather cheap, (NAPA handles 'em too), it's convenient to get to in most cases and it'll save your power steering system a lot of stress.

    Like the other poster said...since you've had a failure, better flush and clean it all. Seal around shaft in steer box will probably be in order also.
     
    The Truckist, Nov 23, 2011
    The Truckist, Nov 23, 2011
    #5
  8. Nov 23, 2011 #6
    Heavyd

    Heavyd Road Train Member

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    Yah, sorry, power steering gear or box.
     
    Heavyd, Nov 23, 2011
    Heavyd, Nov 23, 2011
    #6
  9. Nov 23, 2011 #7
    Jeron379

    Jeron379 Bobtail Member

    22
    6
    Aug 15, 2009
    Moncton New Brunswick
    0
    Thx! So a down power steering pump puts aluminum through the system and the only way to get rid of it is to replace everything. Ouch!
    I didn't see any sign of aluminum in anything when we did the pump swap. That normal?
     
    Jeron379, Nov 23, 2011
    Jeron379, Nov 23, 2011
    #7
  10. Nov 23, 2011 #8
    Dino1968

    Dino1968 Light Load Member

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    Sep 22, 2011
    IN MY _ If I tell ya I gotta killya
    0
    Great info here Thanx to guys who are sharing the knowledge !
    On 1996-2000 model KW T600 or W900 where is this filter located?
     
    Dino1968, Nov 23, 2011
    Dino1968, Nov 23, 2011
    #8
  11. Nov 23, 2011 #9
    The Truckist

    The Truckist Medium Load Member

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    Sep 11, 2010
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    Dino...it can be found INSIDE the power steering reservoir. A couple examples I know of are...on a couple CAT powered trucks I owned, the canister was steel and access to the filter inside was by removing a single bolt from the top. My current 07 379 with Cummins...a band clamp around the center section will allow access inside the reservoir.

    I've never had one where the filter was outside the canister but that don't mean there are none out there. Also some trucks, IIRC, may have coolers for the power steering fluid.

    This is a couple of the filter numbers...but check before you buy.

    Napa Gold #1637
    FRAM #C1720
     
    Last edited: Nov 23, 2011
    The Truckist, Nov 23, 2011
    The Truckist, Nov 23, 2011
    #9
    Dino1968 Thanks this.
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