Greetings and salutations from my corner of the

frozen eastern wilderness@1140 feet above

mean sea level.

Please take note I have to go into great detail regarding this

TO HELP YOU, and HELP ME TO HELP YOU as I am assuming

you have a surface quarry-but the quick fix fix also works for room and pillar mining too.

Have no fear you have a common problem which is

serious and potentially fatal to a bystander but easily solved.

At what time are you checking the tire pressures?

The following information is very important because the tire pressure will vary

widely during the operating day from the use of the tire.

A few questions from me first:

Are you using a solid tire/slick tread or a lug tire?

are the tire pressures identical onn all four wheels or

greater on the bogie end -boom and bucket end of the loader?

The normal state of affairs is to have 10 KPA greater pressure

on the bucket end of the machine.

Assuming on my part you have a 5 piece Goodyear rim, or other

tubeless rim base with a tapered side for your tires consisting of a wheel with a large bore

with a welded lug nut ring attached to it but not centered in the wheel

utilizing lug nuts to attach it to the mounting flange and driven by planetary axles:

If you have tube type rim it is straight across with no slope and has a long machined slot for a tube and

valve stem.

==========================================================================

1. two side wall rings

2. wheel

3. tire sealing ring with o-ring groove

4. tire locking ring

5. wedge lock for tire split rim locking ring

a. large bore tubeless tire valve stem with oring sealing.

b. 3/8 inch metric equivalent O ring for sealing purposes if tubeless

===================================================

As I do not know how many shifts per day you operate-

The tires should be checked only when they are cold and

ONLY then because this is the only time you wil have a

a proper tire pressure- for many reasons including:

The tire is a pressure vessel it becomes a "pressure vessel affected by heat" created by simple friction

which will add air pressure and tire deflection from mucking-scooping, travel speed-tramming speed

road surface condition stressing the tire tread and sidewalls.

What you are dealing and have no physical control over is sidewall

flexing of the tires and this happens for a number of reasons

and of which is something I am very familiar with and is corrected by

you and your tire supplier as a side wall blowout of a tire is

powerfull enough to kill bystanders and not a good thing.

(Also one of the many reasons I absolutely hate and detest

tubeless mining and logging tires with o-ringseals as tube type tires

are easier to maintain from my point of having installed and removed and

repaired tires up 29.00- 26. 00 size and everthing smaller than that as part of

my previous job on a daily basis).

=========================================================================

Solving the problem and the quick fixes

1. Your use of the tire chains adds much life to

your tires and that is great for your use.

2. using smaller shot rounds to make smaller shot

muck piles to allow the loader to scoop\rather than dig



by shooting one line rather than multiple shot lines which

in itself is easier on the machines tires but affects production-

a smaller shot reduces the amount of ore brought down at

one time and reduces the effort required to enter the pile to



dig the material out to transport it to a crusher or haul truck.

This is the quickest fix for you to see immediate results as

less muck will be thrown and the operator should only have

to scoop the rock- a bit more flyrock will be created but

it will be much less weight to deal with as far as resistance

because the actual created volume of material is less.

a. resetting the loaders throttle high idle to 60 percent of actual engine high idle speed-

this will be your easiest to implement solution if you intend to keep your shot rounds

and tonnage the same size, and will be immediate in a solution to your problem.

and physically locking the transmission to limit travel speed to one speed forward,



one speed in reverse- you will see the quickest results with this method as



one one forward speed will be used to enter the muck pile and exit it.

and the engines net available torque will force the operator to

slow down to prevent wheel slip and simply keep scooping until the

bucket is nearly full- FYI you want a bucket load that is struck-level and

not heaped whch makes it harder on the machine in any case.

3. adding liquid calcium chloride ballast, will help with traction but

the loader MUST be reduced to one speed forward and one in reverse

which will totally solve the problem in either case as the tires will be

able to add tractive effort (you do not want the tires to spin while digging)

anyway and by then you have no traction because of the resistance by the shot

limestone weight and actual mass.

4. using the engine speed and travel spedd fixes are the ones with the quickest results for you.

just be sure to check the tire pressures on a cold basis.

Depending on the tire it may have 24 or more tread plies and 18 sidewall plies in its contruction

in addition to wire stengthening reinforcement plies.

Recapping.



Locking out all but the first gear in forward and reverse and changing the engine high

idle speed will show immediate results for you.

Sidewall cracking is inevitable with machines employing planetary axles.

Keep using the chains to protect the tires.

lzaharis

■

Sounds like side walls of retreads cracking. ■

for what its worth

New tire side walls will do the same thing with mining/logging tire so its a common problem-see below.

I have had loaders tear and break the bolts out of the bogie axle mounting/attaching plates due to no spin differentials and too much torque while mucking as the ground did not slip under the loader due to its being rock and the throttle was not limited ■