From: Steve & Jeannie Keith (cckw@comcast.net)
Date: Sun Jun 13 2004 - 18:38:48 PDT
The M123 has a GIANT valve where the directional should be that
applies the brakes to one side or the other (ALA Tank)
I have noticed that my CCKW will move things that my 1.5 ton
chevy won't (spins) and I believe it is because of the tractive force of
the rear tandems.
BTW if your (unmodified) deuce will not roll with the front wheels
straight on a slight incline, your tires are probably not matched
well enough in the back....
Steve AKA Dr Deuce
----- Original Message -----
From: "David Cole" <DavidCole@tk7.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Sunday, June 13, 2004 5:58 PM
Subject: Re: [MV] Bjorn's recipe for long front tire life (M35)
> The effect you mention is really obvious in my M51 when fully loaded with
> rock or gravel. The rear tandem carries just about all of the payload
> weight and has tremendous traction. The front tires literally skid
> sideways when turning. They even make black marks on the pavement, it's
> that bad.
>
> The turning circle of a fully loaded 5 ton dump may be 100 feet or more.
>
> Hence the high speed tire wear in the front.
>
> Bjorn, after you are done with this article, can you do one on splitting
> the braking system into two separate left and right systems with an
> interlock - ala farm tractor steering brakes (;->)?
>
> Seriously, I would really like to see someone try that.
>
> Has the military tried it?
>
> Dave
>
>
> On Sun, 13 Jun 2004 17:13:48 -0400, Bjorn Brandstedt
> <super_deuce@hotmail.com> wrote:
>
> > Sonny,
> >
> > It's the drive shaft between the tandem axles. Without a differential in
> > this connection, the bogie resists any turning motion. The front tires
> > have to work overtime and get worn out very quickly.
> > The theoretical turning circle for this truck with a wheel base of 154
> > inches and a steering angle of 24 degrees is about 64 feet.
> > The manual calls out 74 feet so something isn't performing even close to
> > the ideal. When I removed this drive shaft on my deuce, the new turning
> > circle was measured to be 66 feet. Much better!
> >
> > Bjorn
> >
> >
> >> From: "Ida Heath" <spike@defuniak.com>
> >> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> >> Subject: Re: [MV] Bjorn's recipe for long front tire life (M35)
> >> Date: Sun, 13 Jun 2004 14:34:53 -0500
> >>
> >> Bjorn,
> >>
> >> Which driveshaft are you talking about taking out? The one going from
> >> the
> >> intermediate differential to the rear differential?
> >>
> >> Sonny
> >>
> >>
> >> ----- Original Message -----
> >> From: Bjorn Brandstedt <super_deuce@hotmail.com>
> >> To: Military Vehicles Mailing List <mil-veh@mil-veh.org>
> >> Sent: Sunday, June 13, 2004 10:16 AM
> >> Subject: Re: [MV] Bjorn's recipe for long front tire life (M35)
> >>
> >>
> >> > You are welcome.
> >> >
> >> > By far the most important fix is the removal of the interaxle drive
> >> shaft.
> >> > With it installed the truck suffers from severe understeer and is
> >> pushed
> >> > forward through the turns. That's what causes the cupping and tire
> >> wear.
> >> > Without the driveshaft, the turning radius is reduced to 33 feet (in
> >> my
> >> > case, measured repeatedly in a paved parking lot). The manual calls
> >> out a
> >> > turning radius of 37 feet.
> >> > As far as I know, the A3 version has the same problem.
> >> > A good front end alignment is just "gravy".
> >> > Lowering the tire pressure in the rear will put more tread on the
road
> >> for
> >> > an even wear.
> >> > More pressure in the front because 50 psi just isn't enough for the
> >> load,
> >> at
> >> > highway speed, anyway.
> >> > If you have any questions, let me know.
> >> > Bjorn
> >> >
> >> >
> >> > >From: Marc Strangfeld <curlyjoe98@yahoo.com>
> >> > >To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> >> > >Subject: Re: [MV] Bjorn's recipe for long front tire life (M35)
> >> > >Date: Sun, 13 Jun 2004 07:25:04 -0700 (PDT)
> >> > >
> >> > >Thanks Bjorn
> >> > >
> >> > >I am in the process of putting 11.00 singles on mine
> >> > >and will follow your advice, except for replacing the
> >> > >springs. My trip out west is a good test due to the
> >> > >constant driving and extreme heat. Last year two 80%
> >> > >fronts were trashed in 3,000 miles from the exteme
> >> > >cupping.
> >> > >
> >> > >Marc
> >> > >
> >> > >
> >> > >
> >> > >--- Bjorn Brandstedt <super_deuce@hotmail.com> wrote:
> >> > > > Friends,
> >> > > > Following research for a future article in the
> >> > > > Military Vehicles Magazine, I
> >> > > > have come up with a recipe that will reduce the
> >> > > > front tire wear on the M35
> >> > > > 6x6 trucks:
> >> > > >
> >> > > > 1) Remove interaxle propeller shaft (most
> >> > > > important!)
> >> > > > 2) Replace shocks and springs if they are originals.
> >> > > > 3) Tighten front wheel bearings 1/8 turn on the
> >> > > > adjusting ring (check for
> >> > > > abnormal heating after the first couple of test
> >> > > > drives). This will reduce
> >> > > > camber and toe-in errors.
> >> > > > 4) Adjust toe-in to 1/8 inch max.
> >> > > > 5) Increase front tire pressure to 60 psi and lower
> >> > > > rear (duals) tire
> >> > > > pressure to 40 psi (9.00-20 tires)
> >> > > > (Run on 60 psi on all tires if they are single
> >> > > > 900's or 70 psi on all if
> >> > > > single 1100's)
> >> > > >
> >> > > > This will also give you a turning radius, which is
> >> > > > much closer to the ideal.
> >> > > > Keep the front drive flanges installed for 4x4
> >> > > > action when needed.
> >> > > > Your fuel milage will also improve.
> >> > > >
> >> > > > Have a great day!
> >> > > >
> >> > > > Bjorn
> >> > > > MVPA 19212
> >> > > > Meadows of Dan, Virginia
> >> > > >
> >> > > >
> >> > > >
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> >> > >
> >> > >
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>
>
> --
> Dave
>
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