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34 DOALL INSTRUCTION MANUAL
15. Coolant Tank-—Capacity four gallons.
For types of coolant
see
paragraph “Cool-
ant
Application”
on
page 20.
For quick location of the parts listed
on
this
page the numbers above correspond
to
the
numbers
on
the lubrication chart. _(Fig. 39.)
POINTS OF WEAR
TO
BE
CHECKED MONTHLY
Wheel Tires—When the tires
are
com-
pletely
worn
out,
it
is necessary
to
replace
them by removing the tire with
a
screw
driver
or
other flat tool and stretching the band until
it
can
be broken off. Scrape the wheel clean
and apply
new
cement
before installing
new
tire.
Lower Wheel Brush—When the bristles of
the brush
no
longer
remove
chips from the
wheel tire, the brush should be reversed.
When the brush is
worn
in both directions,
it
must
be replaced.
V-Belts
on
Drive Mechanism—These belts
will stretch slightly after
use.
The stretch of
bo_th belts is automatically taken up by the
hiriged
motor
mounting. Belt tension
can
be
regulated by adjusting the
nuts
on
the motor
base equalizer springs. Do
not
run
the belts
too
tight.
Variable Pulley Assembly—-The pulleys
and sleeves should be checked for grooving.
Saw guide back-up bearings-—The roller
bearing caps
must
be replaced before they
wear
through
to
the bearing.
Saw guide inserts—-The inserts have been
made extremely hard for long
wear
and
as
a
result
are
brittle. Avoid dropping them.
When the insert is
worn
so
that the
saw
slot
is
not
parallel
it
should be reground
to
a
true
45 degree angle. Do
not
grind the flat
or
notched surfaces. They
are
accurately deter-
mined
at
the factory and
are
not
subject
to
wear.
Stone the point of the
saw
guide inserts
after grinding
so
that there is
a
slight
curve
on
the point and point edge.
Blade Shear-—If the knife blades get dull
they
can
be resharpened by grinding them
on
a
surface
or
bench grinder. Disassemble
them by removing the snap rings
on
the pivot
pin and eccentric disc. Then
remove
the
retaining
screws
on
the bottom blades.
BUTT WELDERV ADJUSTMENTS
Before servicing the Butt Welder, be
sure
to
disconnect from the electric power.
The moving welder jaw is rigidly mounted
on
a
single slide rod that slides in the welder
frame. Viewed from the front of .the panel
the slide rod carries
a
switch cut—oif knob
at
its left end. This knob is mounted
on
a
socket
head
set
screw
so
that
it
can
be adjusted in
or
out, thus regulating the timing of the weld.
The cut-off knob operating against the leaf
of'the cut-off switch, opens the circuit when
the moving jaw is in the closed position.
The moving welder jaw has been
set
to
allow
a
movement
of .052". The length of
this
movement
cannot
be changed.
If
too
much flash is formed in welding 1/16" ‘to
1/3" bands, place
saw
in the jaws
as
usual but
leave 1/64" gap between the ends of the
.
band.
A
scant
gap
cuts
down the travel of
the movable
aw.
The
most
important adjustment of the
welding
unit
is the adjustment of the length
of time the
current
flows through the jaws.
Two failures in welding will indicate when
this adjustment is needed.
1.
If
the jaws
move
when the stationary
jaw clamp is released, the circuit has been
broken before the jaw has moved its full
.052".
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