El Paso herald. (El Paso, Tex.) 1901-1931, 1920-05-17

b " and frankly as a layman and not
as a truck engineer
First Point TO Be Considered.
.sThe first point to be considered
I in this respect is the difficulty en-
/ countered in using a type OF tire on
I a truck different from that for which
[ il was intended. To place pneumatic
tires on a truck equipped Cor solids
requires, in the first place, that the
wheels OF the vehicle be cut down.
Moreover. proper allowance must be
provided for both body and fender
clearance as the larger sectional dia-
meter OF the pneumatic tires viii
effect the steering clearance and the
truck viii be unable TO turn in so
short radius IS It did on the solids.
This is especially important in nego-
tiating turns in narrow streets and
alleys as well as in garages with
limited floor speace.
AS the larger diameter OF pneu-
matte tires viii effect the gear re-
duction II substituted for solids the
mechanical ability Of the truck will
be affected. If the change is made,
will the truck be able to make the
grader" VIII il materially affect
the payload capacity Of the truck2
VIII il reduce the ability 70 operate
traflers? What viii the effect be on
the engineer
speed Induces Extra vibration.
The increased maximum speed due
to the larger diameter OF the pneu-
matte tires viii be relatively slight
provided the engine is governed TO
run at the. same speed as formerly.
II the change is made TO get more
speed out Of the machine. the gear
ratio must be reduced. which reduces
the ability Of the truck, or the gov
ernor must be opened and the engine
speed increased. There is danger
here, however, as speed induces ex-
ira vibration, joints begin to loosen.
and before long the engine may be
literally racked to pieces.
Additional speed calls for greater
braking ability. Brakes designed for
slower speeds, but used under more
severe circumstances viii inevitably
require more frequent renewal The
question for the truck owner TO de-
eide before making the change is
whether the truck can be equipped
with brakes having much larger ca
pacitys and 81 not whether IL will
pay 10 take the chance.
OF no less moment than the fea-
lures mentioned above, so far as the
dependability Of the truck is con-
cerned, is the question Of air supply
since pneumatic tires require from
80 to $50 lbs. initiation pressure As
mana pumping IS out OF the question Z
a power driven pump on the truck (
or close at hand becomes a necessity I
and in many cases this is not prae- I
ticable-
May Expect disappointment.
while these mechanical considera- (
tons apply particularly to using /
pneumatics on trucks now in opera 1
ton on solid tires, most OF the same I
problems are involved in changing 4
the equipment on trucks manufac-
-ursd but unsold. The truck buyer
should satisfy himself that his
AGENTS counsel on the equipment is
based on positive facts and endorsed
BY the manufacturer. Otherwise he
nay expect more or less disappoint-
nent and dissatisfaction over the
performances Of his truck II he ord
rs the equipment changed to pneu-
natics before delivery.
TO sum up since so many import
Mt technical features are involved.
be operator or prospective buyer
-ould do well to seek the advice Of 1
be manufacturer OF his truck before
hanging the equipment No one else Z
nows so well the probable effect 8
n various parts nor can advise more :
ltelligently as to the probable loss
? saving such a move would entail
n the mechanism Of his truck"