Tension can be adjusted by a knob on top of the brake
1-35. FUEL PUMP. The fuel pump is operated by the
engine camshaft eccentric directly contacting the fuel
pump rocker arm which in turn actuates the diaphragm.
1-44. ENGINE ASSEMBLY.
The vacuum created by the diaphragm movement pulls
the gasoline from the supply tank, through the inlet valve,
1-45. The gasoline engine (8) is a six-cylinder,
and into the fuel chamber. A fuel filter is an integral part
water-cooled, four-cycle, flat head engine. A positive
of the pump.
displacement, gear-type oil pump forces the engine oil
through an oil filter to lubricate the engine.
1 - 3 6 . CARBURETOR AND GOVERNOR
ASSEMBLY. A single venturi, downdraft-type carburetor
1-46. CRANKSHAFT. The crankshaft is
is installed on the engine. Fuel is supplied through a float
counterweighted and is balanced. The shaft is rifle-drilled
system which consists of a gasoline intake needle, float,
for pressure lubrication of all bearings.
and float chamber. An economizer or step-up system
provides extra fuel for maximum power under full load
1-47. CAMSHAFT. The cast iron alloy camshaft
operation. The carburetor has a manually-operated choke.
incorporates cam lobes for actuating the valve tappets and
an eccentric for operating the fuel pump. The distributor
1-37. A velocity type governor is installed on the
and oil pump are driven by a gear which is an integral
carburetor. Engine speed is governed by the throttle valve
part of the shaft. The chain case cover contains an oil seal
which is closed by the velocity of the fuel-air mixture as
which prevents leakage of oil at the front of the engine.
it passes through the governor. An accurately calibrated
spring system attached to the throttle shaft opposes the
1-48. PISTONS. The aluminum
alloy pistons are
unbalanced air velocity force and controls the position of
attached to the connecting rods by
floating type special
the throttle valve and the maximum speed of the engine.
casehardened piston pins. Each
piston carries two
When in proper operating condition, the governor does
compression rings and two oil rings,
all located above the
not affect engine performance below the speed at which
it begins to control, and does not affect fuel
1-49. CYLINDERS. The cylinder block and upper
crankcase are contained in a one-piece casting. The
1-38. COOLING SYSTEM.
cylinder bores are completely surrounded by water jackets
which extend the full length of the cylinder walls. The
1-39. The cooling system (6, figure 1-2) has a tube and
bores are honed to provide the proper piston clearance.
fin-type radiator which cools the engine. Hydraulic
transmission fluid is cooled through the use of separate
1-50. AIR CLEANER. A heavy duty, oil-bath type air
passages in the lower section of the engine coolant
cleaner provides maximum protection against dust, dirt
radiator. A radiator shroud encloses the belt-driven fan.
and abrasives entering the engine through the carburetor.
The cab heater is connected to a hot water pressure
outlet on the water pump. The coolant is returned to a
1-51. HYDRAULIC TRANSMISSION.
cold water suction inlet on the water pump.
1 - 5 2 . The tractor is equipped with a hydraulic
1-40. WATER PUMP. Circulation of the coolant
transmission (9, figure 1-2) sometimes referred to as a
through the engine is accomplished by a centrifugal pump
torque converter, located at the rear of the engine and
mounted at the front end of the engine. The pump is
connected to the engine crankshaft. The unit multiplies
the engine torque, as required, to prevent engine stall, by
driven by a V belt from the engine crankshaft.
adding power during heavy towing operations. It also
1-41 . PARKING BRAKE INSTALLATION.
permits the tractor to move heavy loads with a shock-free
1-42. The parking brake (12) is attached to the output
shaft of the mechanical transmission. It is an external,
1-53. CLUTCH, The hydraulic transmission has an
contracting band type. The band is cam actuated and is
integral hydraulic clutch unit which operates on the same
spring loaded for return to normal position.
filtered fluid as the transmission. The clutch is operated
by a solenoid which is activated by a switch on the
1-43. PARKING BRAKE LEVER. An overcenter
mechanical transmission shift lever. The clutch disengages
parking brake lever, to the right of the operator's seat, is
the transmission drive connection permitting manual gear
connected to the parking brake cam by a control rod.