International Harvester Company TD-24 Operator's Manual page 12

DESCRIPTION
Engine Speed Control
The engine speed control lever secures
governed speeds from 500+50 r.p:m. (low
idle) to l5Z5
±
30 r.p.m. (high idle). With
the engine operating at 13.75r.p.m. full load
speed, the t r ave Ling speed range is from
approximately l-l/Z to 8 m.p.h. forward, and
from l-l/Z to 8 m.p.h. in reverse. The syn-
chromesh transmission makes possible a
quick change from forward to reverse by
disengaging the engine clutch arid shifting the
left-hand lever: forward to go ahead, and
backward for reverse.
Track Frames
The track frames are 1 piece welded
steel construction. Regular tracks have 6
lower rollers and Z upper idlers on each
side. The large bearings and the new type
seals allow high tractor traveling speeds and
long periods between track roller lubrication.
A series of saucer-like bellville springs in
an enclosed cylinder permits the front idlers
to recoil under heavy shock but holds them in
position against full load track pull when the
tr acto r travels in reverse.
Sprocket drive gears are mounted on
sleeves independent of the track frame pivot
shaft. Shock loads on the track frames,
therefore, do not affect gear alignment.
Track frames are relieved of leverage loads
and track alignment is maintained by the
same arrangement that has been so success-
ful on smaller sizes of International crawler
tractors.
Sprocket Drives
The sprocket drives consist of sprocket
drive gears and pinions which provide a fixed
gear reduction and transmit power out to the
tracks. Gears
arid
vs pr ocke t s are roller
bearing mounted on sleeves. Sprockets are
reversible, making
it
possible to use both
sides of the teeth.
OR1ENTATION
Throughout this manual the use of the
m.s "left" and "right," and "front" and
"rear," must be understood to avoid con-
fusion when following instructions. Left and
. :t:ight indicate the left and right sides of the
!'----,.
tractor when facing forward from the oper-
ator's compartment. The front of the trac-
tor is the radiator end; the rear of the
t
r a.c- .
tor is the fuel tank end .
(
..
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