The Sidney herald., 1955-05-05
Giant CrawIer
Announced By
Local Cat Dealer

craWIer tractor with turbocharged
engine became the sixth machine
in Caterpillar's track-type line on
May l.. 1t is the Cat Do Tractor
which received considerable at
tention from construction men
loggers, mining men, and nine
liners during an extensive field
testing program in 1854.
According to Tractor & Fo,,in-
ment Company, Caterpillar dealer
in this area, announcement of tba
$4,000 pound Do = the worlds
biggest, most powerful production
crawler cGmaxes 10 years of
big tractor research and deveIon-
ment at Caterpillar. Moreover tba
company has drawn upon so vearS
of track-type manufactured az
perience to produce a 'light-foot-
ed giant, with every part aimed
at the kind of service which ic
too tough and too rugged for 9th
er tractors"
A new GA X 8, six-cylinder ct
Diesel Engine is equipped with >
turbocharger, an advancement in
track-type tractor manufactI,ra
The tractor also will have Cater
pillars oil-type clutch or optional
~ a tongue converter. i~n-sea+
starting, hydraulic track adjust
ment, excellent operator visibiIitv
and many ~servicing conveniences
Caterpillar expects the DO will
be used In virtually every track
type tractor application and mar
ticularly in general construction
logging, pipelaying, mining and
quarrying. Some of the available
attachments include the No. 9s
and No. ga Bulldozers, push Gun
front and rear cable controls.
Although the tractor is big. gen
eral appearance will conform tn
the other five models of cat
crawler tractors. Length is 17'1O".
width, 911"; height Excluding ex-
haust pipe and air cIeanerl. 8'9n
Ground clearance is 21".
Nlnety-inch guage will be stand
ard as will a seven roller track
frame and fixed drawbar. A con
Sole-type control panel, seat de-
sign and location and careful ar
rangement of operating controls
make a flat, relatively open deck
There IS a six-volt electric start
er for the two-cylinder starting
engine.
The diesel engine, which deliv-
erS 286 HIP at 1900 RPM for both
the torque converter and direct
drive models, shows considerable
attention to external appearance.
Oil lines, fuel lines and water
tubes r placed internally as
much as possible.
Several features of the engine
include % short valve push rods I.
which are possible because the {,
camshaft is high in the block. (2) !
stationary oil jets provide a con- :
.lnuous stream of oil to cool the !
olstons, the camshaft and follow :
ars, (3) steel-backed aluminium
bearings with the lower half of :
he center main bearing to take ,
he camshaft thrust on a flange- }
,ype-bearing. :
All accessories are driven from c
/ gear at the rear of the crank :
shaft to avoid much torsional vi
)ratlon. There is constant power :
rive for rear-mounted equipment. ,
'uch as cable controls, providing I
power regardless of whether the :
lywheel clutch is engaged or
When the torque converter is OBJ
at lowest speeds.
Pressure fabrication and full
low filtration are provided in the
.ngIne, the transmission, s~teering
lutch release booster and each
nal drive. Pressure fabrication
S provided also for the oil clutch
nd starting engine.
The torque converter is a three
tage, 81 torque multiplication
nit using diesel fuel for the by
raulic fluid. The flywheel clutch
Sed with the torque converter is
19-inch single plate, dry-type.
converter fluid cooling is
rovided by a w~ater-type heat ex-
hanger mounted on the right
and side of the engine. Speeds
p to 7.8 MPH with three speeds
onward and six in reverse ranging
1.6 to 6. 8 MPH. With the di-
7ct drive transmission, drawbar
oundS pull of 6O,86O pounds are
osSible with adequate weight and
action.
Welded fabrication of the steer
lg clutch case and main frame
rovides a rugged backbone for
entire tractor assembly which
IS in with the severe service to
.hlch this machine will be sub
'cted. A one-piece welded track
)Iler frame includes closed oil
pc recoil spring housing and
ack guiding guards at each end
the frame. The equalizer bar
'sts on moulded rubber pads on
le track roller frame. Heavy-duty
guard and half-inch thick
nders r standard equipment
The conventional drive Do will
elgh $4,000 pounds and the tor
converter model, 56,650
FUNDS. The s~even-roller track
anne inSures great flotation and
ability. The front idler is the
orlcated disc type. It is a two
'Sltlon idler and may be adjusted
T either dozer or drawbar work.
The standard track shoe. heat