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    Guest Message by DevFuse
     

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    King Pin Adjustment



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    10 replies to this topic

    #1 OFFLINE   HeyCharger

    HeyCharger

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    • Location:Camden South, NSW - Australia
    • Make:Mack
    • Model:B61T
    • Year:1961

    Posted 25 July 2009 - 05:22 AM

    Hi Guys. My B61 has a FA505 front axle.
    I believe the king pins can be adjusted. In the manual, it looks like I have "type III". According to the manual, I jack under the axle centre to remove the load, remove the cotter pin and adjust the thrust bearing screw to bring within tolerance.
    Has anyone done this and are there any things to watch for?
    Thanks. Rod.
    Proud owner of;
    1961 Mack B61 prime mover.
    1981 International ACCO 1810C DualCab Fire Truck

    #2 OFFLINE   Swishy

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    Posted 25 July 2009 - 07:04 AM

    Hi Guys. My B61 has a FA505 front axle.
    I believe the king pins can be adjusted. In the manual, it looks like I have "type III". According to the manual, I jack under the axle centre to remove the load, remove the cotter pin and adjust the thrust bearing screw to bring within tolerance.
    Has anyone done this and are there any things to watch for?
    Thanks. Rod.


    RodMan
    GuddayM8
    in the straight ahead poistion is where most of the work n wear iz dun
    so if U nip up the adjuster a notch then check th@ the steerin aint binding on both full locks,
    above the adjuster nut is sum encaged ball bearings ( a simpler name eludez me)
    it may B damaged n may need replacing
    jist make sure it aint lockin up on full lock
    cya
    §wishy


    #3 OFFLINE   fjh

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    Posted 25 July 2009 - 07:21 PM

    Hi Guys. My B61 has a FA505 front axle.
    I believe the king pins can be adjusted. In the manual, it looks like I have "type III". According to the manual, I jack under the axle centre to remove the load, remove the cotter pin and adjust the thrust bearing screw to bring within tolerance.
    Has anyone done this and are there any things to watch for?
    Thanks. Rod.


    The only adjustment you will get from what your doing is up and down!Don't be fooled by thinkng your able to adjust side movment if you adjust tight enough to cover up side movment its too tight.

    #4 OFFLINE   Mc OZ

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    Posted 25 July 2009 - 09:24 PM

    http://12.158.118.19...11-sb422004.pdf

    fjh is right the only adjustment to stop the knuckle binding on the beam.

    As a straight pin at either end when the bushings/ bearings are worn there is
    nothing you can do when they are worn. It is a good idea to keep the adj in specs
    as to not have too mutch float as to pound the thrust button to bits.........Mark

    #5 OFFLINE   Rob

    Rob

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    Posted 25 July 2009 - 10:03 PM

    http://12.158.118.19...11-sb422004.pdf

    fjh is right the only adjustment to stop the knuckle binding on the beam.

    As a straight pin at either end when the bushings/ bearings are worn there is
    nothing you can do when they are worn. It is a good idea to keep the adj in specs
    as to not have too mutch float as to pound the thrust button to bits.........Mark


    Hi Mark, the link does not appear to function properly.

    You would be adjusting for a clearance of about .005 between the spindle and top of the axle beam with the axle loaded. If you can't get that clearance close the thrust bearing is probably worn out and time for replacement. That is not too difficult of job but if needing to go that far just get a king pin, (or bolt) kit and replace everything. The top should be a needle bearing pack, the bottom a pre sized bushing that does not require reaming to size. Of course all the seals, and shims, (sometimes) are included.

    I've found from a labor standpoint that it is more cost advantageous to replace everything at once rather than to piece meal it together and then do it again at a later date.

    Rob

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    #6 OFFLINE   HeyCharger

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    Posted 27 July 2009 - 04:07 PM

    Thanks for your input guys.
    From my research, the FA505 has TAPERED PINS;
    http://www.meritorhv...ents/pb8951.pdf
    In this document, they are depicted as "type E". However, as mine have the adjustment nuts on the bottom, they sure do look like "Type D".
    Rod.

    And this;
    http://catalog.elgin...t=King Pin Sets
    Proud owner of;
    1961 Mack B61 prime mover.
    1981 International ACCO 1810C DualCab Fire Truck

    #7 OFFLINE   Rob

    Rob

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    • Year:1951 1957 1958 1962 1964 1973 1974 1978 1977 1980

    Posted 27 July 2009 - 05:46 PM

    Thanks for your input guys.
    From my research, the FA505 has TAPERED PINS;
    http://www.meritorhv...ents/pb8951.pdf
    In this document, they are depicted as "type E". However, as mine have the adjustment nuts on the bottom, they sure do look like "Type D".
    Rod.

    And this;
    http://catalog.elgin...t=King Pin Sets


    Hi Rod, here are a few photos of a king pin set for a 505 axle. This set is brand new.

    Rob

    Attached Files


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    #8 OFFLINE   Mc OZ

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    • Year:1968

    Posted 28 July 2009 - 03:00 AM

    Rod,Go to Mack and ask for King Pin set 501SQ45A. Fits FA,505 FA,511.

    Gleemans No for PAI AKP-9520 pin set. Keep away from Meritor stuff it is differentt to the old stuff.

    I just replaced the front axle ( found a new axle beam 538) with narrow centre bolt centres
    on the old mack 2 weeks ago king pins, new steer springs, tie rods bearings ect.
    took me 9 hours by my self. It dont get any easer as you get older but i did it in a day..... Mark

    #9 OFFLINE   Freightrain

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    Posted 10 August 2009 - 03:28 PM

    Replacing the pins on my B was easier then any old Ford I beam I've done. Couple hours to fully dismantle the front end and that included jacking it up, getting the tires off, and knocking it apart fully to bare bones. Mine has the taperd pins as shown by Rob, though don't recall what my axle number is?

    I assembled it, seating the bottom nut fully and haven't touched it in 8 yrs. Never really knew what the spec was? Still steers with two fingers, goes down the road at 65 with no hands.
    Larry

    1959 B61 Liv'n Large......................

    Posted Image

    Charter member of the "MACK PACK"

    #10 OFFLINE   HeyCharger

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    • Model:B61T
    • Year:1961

    Posted 11 August 2009 - 07:01 PM

    Hi Guys. Finally found this;
    Posted Image
    Posted Image

    It looks like I just have to adjust "F-Thrust Bearing Nut" as shown in image top, left hand side. Rod.
    Proud owner of;
    1961 Mack B61 prime mover.
    1981 International ACCO 1810C DualCab Fire Truck

    #11 OFFLINE   Rob

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    • Make:Mack
    • Model:A-40H, B-61T, B-61ST, B-67ST, B-61S, RL-797LST, RL-797LST, RL-755L, R795, R612ST
    • Year:1951 1957 1958 1962 1964 1973 1974 1978 1977 1980

    Posted 11 August 2009 - 09:49 PM

    Hi Guys. Finally found this;
    Posted Image
    Posted Image

    It looks like I just have to adjust "F-Thrust Bearing Nut" as shown in image top, left hand side. Rod.

    Hi Rod, yes that is true of what you must adjust. You need to obtain .005, (five thousandths) of an inch clearance between the top of the axle beam, and the bottom of the spindle top pivot point. This is shown on your diagram as "C", and labled the top knuckle bushing. The spindle pivots on the king pin there. If your clearance cannot be adjusted closer than about .015, (fifteen thousandths) between these two points, replace the king pins and bushings.

    Rob

    Going through life knowing considerably more about nothing than the next person.

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