Abstract: The present invention consists of a three-wheels vehicle having two front driving and steering wheels, and an engine ahead of these two wheels to counterweight the driver and passenger sitting in tandem, in order to bring the vehicle-occupants center of gravity close to these two front wheels which are alone to limit roll-over danger in curves at high speeds. Such a lay-out presents an outstanding set of advantages: weight up front for safety in collisions, stability at high speeds, traction and steerability in mud, sand or snow; and still small for ease of driving and parking, low fuel consumption and pollution, and low purchasing and operating costs.

Abstract: An air intake passage formed inside a main pipe which constitutes a portion of a body frame of a vehicle. An air chamber which provides communication between the air intake passage and an air cleaner is formed by utilizing the inside of a gusset which is provided to reinforce the connection between the main pipe and a pair of center pipes extending rearwardly from the main pipe on the right and left sides, respectively.

Abstract: A tricycle having at least one front wheel and a front fork carrying the front wheel, fuel and oil tanks positioned at the rear of the front fork, comprising at least one longitudinal frame elongated in a longitudinal direction of the tricycle and securely connected at its foremost end to the front fork structure, the fuel and oil tanks being supported on a front portion of the frame, and a rear fender structure having a front tank cover portion and at least one rear fender portion which merges rearwardly out of the front tank assembly cover portion and which is pivotally connected to the frame in the neighborhood of the rear end of the frame so that the rear fender structure as a whole is pivotally movable between a lower angular position resting on the frame and having the fuel and oil tank assemblies enclosed within the tank cover portion and an upper angular position raised above the frame and the tanks.

Abstract: A shaft drive apparatus for transmitting power from an engine through a drive shaft to driving wheels. The shaft drive apparatus has a final output mechanism and a brake mechanism disposed adjacent to each other substantially axially centrally of an axle of the driving wheels, the drive shaft being disposed substantially on a longitudinal central axis of a vehicle body and between the final output mechanism and the brake mechanism.

Abstract: The present invention relates to a three wheeled motor vehicle with an electronic speed control system for controlling the speed of the vehicle while in reverse operation. The electronic speed control system includes a speed detection circuit and reverse gear detection circuit to alter the ignition of the vehicle. By altering the ignition, further acceleration may be prevented.

Abstract: Several embodiments of improved three wheel vehicles particularly adapted for off the road use. In each embodiment, the rear wheels are suspended by a suspension system that includes a suspension element that has its line of action is disposed at a relatively shallow angle to the horizontal so as to provide a long suspension travel. A trailing arm assembly is provided in each embodiment for suspending the rear wheels. The trailing arm assembly includes a pair of spaced apart arm members that are pivotally supported by a frame at their forward end. The pivot points of the arm members on the frame are transversely spaced apart a distance substantially equal to the width of the vehicle so as to improve stability. In some embodiments, a shaft drive is incorporated that passes through one arm of the arm members. In some embodiments, the suspension element is offset from the longitudinal axis of the vehicle toward the side opposite that on which the shaft drive is located.

Abstract: An improved transmission in a motor vehicle including a body, an engine located in the vicinity of the center of the body, a pair of footrests attached to the body near the engine, and front and rear wheels. The transmission is integral with the engine and has a casing, a shift spindle having one end projecting from the casing and rotatable for shifting the transmission, and a control lever coupled to the shift spindle. According to the improvement, a cam means is interposed between the control lever and the casing for limiting shifting operation of the control lever. The cam means comprises a cam member having a cam surface and fixed to the casing, a shaft member axially slidably fitted in the control lever and having a control knob on a first end thereof, and a spring disposed between the shaft member and the control lever for urging the shaft member to cause a second end of the shaft member to abut against the cam surface of the cam member.

Abstract: An exhaust pipe apparatus for a vehicle in which an exhaust pipe for an engine is disposed below an occupant's seat. The apparatus includes an auxiliary exhaust pipe having a bent portion which is bent at a substantially right angle with respect to the axis of the exhaust pipe. The auxiliary exhaust pipe is water-tightly connected to the rear end portion of the exhaust pipe in such a manner that the auxiliary exhaust pipe is pivotable between a reclining position where it is reclined below the seat and an erect position where it is erected above the seat. This arrangement makes it possible to effectively prevent water from entering the exhaust pipe when the vehicle is running through a ford, for example, by pivoting the auxiliary exhaust pipe, which is normally placed at a relatively low position, to the erect position and retaining the auxiliary exhaust pipe in this position.

Abstract: An off-the-road vehicle having at least two rear wheels mounted on axles which are journaled for rotation within the housing of a torque transfer type differential whereby drive power from the motor is coupled to the slower rotating one of the two rear axles.

Abstract: An articulated tricycle of the swingable type employing a front body and a rear body, the front body having a front wheel and a rear body having two rear wheels mounted on an axle or axles. The rear body includes a first body member and a second body member. The first body member is pivoted about a longitudinal axis to the front body while the second body member is pivotally mounted about a transverse axis to the first body member. The second body member includes mounting for the rear wheels. The second body member may be divided into two links to provide independent rear suspension for the wheels. A gear train extends between an engine, located in the first body member, and the rear axle or axles. This gear train is shown to include a chain or belt drive and may include two such chains or belts when the second body member employs two links.

Abstract: A three wheeled shaft driven off the road vehicle having an improved driving arrangement. The driving arrangement includes an overload release coupling that is positioned between the driven gear and a drive shaft that drives the rear wheels so as to minimize the complexity of the transmission and to protect the engine and drive. A trailing arm rear suspension is employed that has widely spaced bearings for rotatably journaling the rear axle to minimize unit loadings. An arrangement is also disclosed for facilitating axial positioning of the driven gear on the output shaft without necessitating the use of shims.

Abstract: A new and unique saddle-riding type motorcar having four wheels comprising two front wheels and two rear wheels, wherein each of the front and rear wheels has a balloon tire mounted thereon and only the front wheels are rotatably supported on axles in such a manner as to turn in both directions relative to the longitudinal axis of the motorcar and the latter is steered by steering the front wheels by means of a bar handle constituting a steering mechanism.

Abstract: A three-wheeled motor vehicle including one steerable front wheel, two rear wheels serving as driving wheels, a fuel tank disposed on an upper portion of a frame, a seat disposed behind the fuel tank, and an engine mounted below the fuel tank. The above engine is a water-cooled engine. A cylinder portion of the engine is disposed on the rear side in the longitudinal direction of a case portion of the engine which case portion underlies the cylinder portion, and a radiator is disposed within a space formed in front of the cylinder portion. By the above arrangement, a large space is ensured in front of the cylinder portion without the need to enlarge the longitudinal size of the three-wheeled motor vehicle, and cooling devices can be disposed within such space.

Abstract: A Parking lock operating device for a motor tricycle is disclosed. The motor tricycle includes a front and rear bodies which are equipped with a single wheel and two wheels, respectively. The motor tricycle is also equipped with parking brake means for braking the movement of the tricycle when stopped and means for preventing the front body from rolling and swinging in parking. The parking lock operating device may effect both the parking brake means and the means for preventing roll and swing motions of the front body relative to the rear body by a single operation lever. In addition, for burglarproof of the tricycle, a key switch cannot be pulled apart unless the operating lever is rotated to a predetermined position after the operation lever is lifted up for parking lock.

Abstract: An apparatus for attaching a transmission casing and a brake casing in a motorized three-wheeled vehicle having a rear wheel axle interconnecting between a pair of right and left rear wheels, and a transmission casing housing a final stage driving mechanism and a brake casing housing a brake mechanism provided around the axis of the axle, characterized in that the transmission casing and the brake casing are composed of respective sealed casings, and the two casings are disposed side by side leaving a space therebetween, and are combined together at circumferentially arranged plural positions with plural fastening bolts. The two casings are fixed to a vehicle body of the motorized three-wheeled vehicle by utilizing at least one of fastening bolts for combining the two casings together.

Abstract: A three wheel off the road vehicle having a configuration that facilitates servicing of the air filter element. The air cleaner housing is positioned at the rear of the vehicle between the rear wheels and with a portion in an open area for direct access. The air filter element is removable for servicing through this opening upon removal of an access plate.

Abstract: A trunk storage system for use in vehicles having a front leg shield. The trunk storage system has a cavity formed within the front leg shield. A removable trunk is adapted to fit within the cavity and the trunk includes a lid member which forms a continuous surface with the front leg shield. Means are provided for selectively maintaining the trunk in the cavity.

Abstract: A two-wheeled vehicle comprising a vehicular body inclusive structure having the center of gravity thereof deviated in either transverse direction from the vehicle center line, a steering system inclusive structure transversely turnably connected with the vehicular body inclusive structure, and front and rear wheels supported by the vehicular body and steering system inclusive structures, respectively.Either one or both of the front and rear wheels are offset with respect to the vehicle center line, in the opposite transverse direction and in the same transverse direction as the center of gravity of the vehicular body inclusive structure, respectively. In this manner, the vehicle is permitted to travel in a straight course with a substantially upright position.

Abstract: A control system for a vehicle in which a vehicle operator in a first location manually turns a twist grip in one direction to exert a force on and displace an oil column in a conduit tracing a long and tortuous path to an engine throttle remotely located from the twist grip to set the throttle valve at an infinite number of positions. When the twist grip is manually turned in an opposite direction, a spring effects return of the throttle valve and the system toward a closed throttle position.

Abstract: An offroad auto tricycle embodying an improved air inlet to prevent the ingestion of foreign material and particularly water into the engine induction system. The air inlet device includes an elongated air inlet tube that has its inlet end positioned in proximity to and beneath the forwardmost portion of the seat for protecting the air inlet from foreign matter.

Abstract: A front suspension of a light vehicle having a single front wheel supported on one side thereof with a single supporting member and offset to one side of the center line of the vehicle.In this manner, the inclining tendency of the vehicle is reduced and the rectilinear travel of the vehicle is maintained, notwithstanding the imbalanced weight of the steering structure resulting from supporting the front wheel on one side thereof through a single support system.

Abstract: An individual wheel rear suspension for a vehicle having a steerable single front wheel and at least a pair of opposed rear wheels each driven from a common power source. The suspension comprises a central driven shaft with each end connected to an axle through a universal joint, the outer ends of the axles are enclosed by a collar member which allows the axles to rotate therein, a torsion bar is connected between each collar member and the central frame member to prevent horizontal displacement of the axles, and two resilient members in the form of hydraulic shock absorber and coil spring combinations are connected between the collar members and the central frame to allow resistive vertical movement of each axle independent of the other.

Abstract: An engine cover device for light vehicles including a cover main body for use in covering a driven wheel and a power unit from the outsides thereof, a first partition wall for separating the driven wheel and the power unit, and a second partition wall for separating a muffler and other associated equipment units for the engine such as an air cleaner, a carburetor and the like. The second partition wall is arranged such that a space for the installation of the muffler is formed at a rear part of an air discharge port of a forced air cooling device for the engine, and the front part of the cover main body is projected outwardly as it is extended from its front end toward its rear part so as to provide for formation of an air communication hole at the side surface of the cover.

Abstract: An articulated tricycle of the swingable type employing a front body and a rear body, the front body having a front wheel and the rear body having two rear wheels mounted on an axle. The rear body includes a first body member and a second body member. The first body member is pivoted about a transverse axis to the front body while the second body member is pivotally mounted about a longitudinal axis to the first body member. The second body member includes mounting for the rear wheels. A gear train extends between an engine, located in the front body, and the rear axle. This gear train may pass through either the first body member or second body member and includes a chain drive. Either the drive sprocket or the driven sprocket is positioned about a constant velocity universal joint which is in turn positioned about a transverse shaft or the transverse rear axle.

Abstract: A rear suspension system for motor vehicles. Both leg ends of a gate-shaped swing arm which at its free end supports the central part of a rear axle are pivotably secured to a vehicle body frame, a tension rod is provided between the lower end of a downwardly extending swing link mounted near the free end of the swing arm and a portion of the vehicle body frame near and below the above pivoted point of the swing arm, and one end of a damper disposed between both legs of the swing arm in a position above the tension rod is mounted near and above the pivoted point of the swing arm, while the other end thereof is attached to the swing link. The rear suspension system can be mounted in a relatively narrow space, and even with devices of relatively large capacities mounted thereabout, it can exhibit its damping characteristics satisfactorily.

Abstract: A floor structure for small-sized, light vehicles having a low floor, such as motorcycles and three and four-wheeled vehicles. The floor structure of the small-sized light vehicle comprises a substantially flat floor inclined forwardly downward so as to be relatively higher at the rear end thereof and relatively lower at the front end thereof. The actual longitudinal length of the floor is shortened without extending the substantial longitudinal length thereof, thereby attaining reduction in size and weight of the vehicle. The bending angle of a driver's ankle positioned on the floor when driving the vehicle can be made relatively large, thus permitting a more comfortable driving posture.

Abstract: Human-powered, front-wheel drive tricycle of a 2DS-1IS (2 driven, steerable-1 independent suspension) format having two steerable front wheels in a fully engineered front end, a multi-triangulated space frame and a single trailing rear wheel mounted in an independent swing-arm type suspension. A chain drive system (21+speeds) includes a crank assembly mounted on a prow ahead of the front wheels driving a transfer gear and differential to the split front axle. A transfer gear caliper/disc braking system ahead of the differential provides braking force equally distributed to both front wheels regardless of road conditions, resulting in anti-skid properties. Track/wheelbase ratios above 0.45 provide stability and excellent handling; FWD provides excellent traction. Preferably, all wheels are of the same 20" diameter. Rider is in a semi-recumbent, supine position with handlebars, having shift and braking controls, mounted beneath a rigid seat. Shoulder harness and seat belt system are provided.

Abstract: A rear suspension system for a motor-tricycle has a frame, a seat and a pair of rear wheels mounted on opposite ends of a rear axle. An integral engine unit includes an engine with a power train connected to the engine, for transmitting the output power of the engine to the rear axle. The rear end of the engine unit supports the rear axle. The engine unit and rear axle assembly is pivotally coupled to the frame via an elastic means, to enable the axle to swing up or down relatively to the frame. Thus, the deformation of the elastic means makes the frame slightly tiltable in the direction perpendicular to its longitudinal axis. A shifting of a rider's weight, while making a turn at a curve, is facilitated, since the frame is made tiltable relatively to the engine unit. Further, since an exhaust silencer or muffler is positioned between rear shock absorbers or cushion units, the safety is improved.

Abstract: A small, lightweight, three-wheel two-passenger automotive vehicle has a rigid, open main box frame of tubular steel formed by two spaced side rails joined by front and rear rails, with a motor mount frame extending forwardly from the main frame; a unitary, one-piece tub of molded, glass fiber reinforced resin fills most of the main frame opening and peripheral flanges on the tub are resiliently mounted on the side rails of the main frame. The bottom of the tub extends below the side rails of the main frame, affording a support floor and side walls for a passenger compartment encompassed by the main frame and also providing a cover or support, or both, for such vehicle components as a hand brake lever, gear shift lever, fuel tank, transmission, etc. A unitary, one-piece body shell of molded, glass fiber reinforced resin is resiliently mounted on the tub and covers the exterior of the main frame; a unitary one-piece fiber glass hood is provided to complete the vehicle body.

Abstract: The invention provides an improved, independent swing-arm type suspension for three-wheel vehicles and includes a special yoke frame in which the rear axle is rigidly mounted, and cross rails for mounting a storage box thereon. The box is mounted directly onto the frame cross rails. The entire rear assembly is mounted by swing-arm pivot and triple spring/shocks between the main frame and the rear swing-arm frame assembly. This assembly moves the point of travel to below the rider's seat, thus giving improved ride and handling characteristics. The rear axle employs a fully engineered off-center differential connected to an in-line drive shaft for better performance and easier maintenance.

Abstract: A drive unit for a vehicle having two juxtaposed drive wheels comprises an engine, an axle for supporting on its ends the drive wheels, a final output gear operatively coupled with the engine and mounted on the axle adjacent to one of the drive wheels, and a power transmitting assembly mounted on the axle adjacent to the other drive wheel, the engine being located between the final output gear and the power transmitting assembly. A crankshaft extends parallel to the axle and supports on one end a flywheel for a generator and on the other end a clutch including a speed changing device. The drive unit is unitized, compact in size, simple in structure, and requires a minimum number of parts.

Abstract: Three-wheel motorcycle with cambering main frame supporting a front steering column and front wheel. The cambering frame is pivotally mounted on a centralized non-cambering rear support including the engine that carries the rear suspension and laterally spaced drive wheels. Operator footrests are mounted on rear support and automatically tilt with the cambering frame to improve operator balance of the vehicle.

Abstract: A rear-wheel suspension device on a tricycle vehicle having front and rear vehicle portions interconnected by a rolling joint having a sleeve bearing. To provide increased stability between a pair of rear wheels of the tricycle vehicle, a casing of the rolling joint is pivotably mounted on a frame of the front vehicle portion for pivotable movement. The rolling joint has a spindle connected in a fixed positional relationship relative to axles of the rear wheels. A shock absorber is interposed between the frame and the casing. To increase damping and vibration-isolating ability, the casing is pivotably connected to the frame by a link, and the shock absorber is oriented so as to be substantially perpendicular to a straight line passing through an axis of the rear-wheel axles when they are loaded and a pivot point at which the link is pivotably connected to the casing.

Abstract: A three-wheeled cambering vehicle having a rear noncambering module which has a forwardly extending tongue which rotatably supports a main and front cambering module. The cambering module carries the vehicle operator who steers the vehicle by rotating a single front wheel about a substantially vertical axis and additionally leans in response to vehicle turn and his own will, the two modules are rotatable in relation to each other about an inclined camber axis extending longitudinally of the vehicle. The cambering module has cambering controls at a forward portion thereof to allow the operator to physically engage the controls with his feet for cambering the front module relative to the ground and rear modules.

Abstract: A tubing assembly provided between two movable bodies such as front and rear body portions of a three-wheeled motor vehicle. The front body is laterally swingable relative to the rear body and these bodies are relatively movable along longitudinal and vertical directions thereof. The tubing assembly includes a first flexible tubular member extending substantially vertically and having one end connected to a first rigid tubular member of said front body portion, a second flexible tubular member extending substantially horizontally and having one end connected to a second rigid tubular member of said rear body portion, and a generally L-shaped intermediate rigid tubular member connected between said first and second flexible tubular members. The tubing assembly is positioned outwardly offset from a rotational center of said movable bodies and at the same longitudinal side of said vehicle.

Abstract: A cowling for a motor-driven tricycle vehicle having two rear wheels, a front wheel, and an engine and a seat. The cowling is in two members: a front and a rear member, which are independently attached and removable to the vehicle body. A split is provided between the sections to admit cooling air to the engine inside the cowling.

Abstract: A tricycle vehicle having a forward wheel, two rear drive wheels, an engine driving said wheels, and a seat, all mounted to a body. A foot rest protrudes from each side of the body. The seat extends forwardly of the foot rests, and the crankcase of the engine is disposed rearwardly of the foot rests.

Abstract: A drive unit for a vehicle having two juxtaposed drive wheels comprises an engine, an axle for supporting on its ends the drive wheels, a final output gear operatively coupled with the engine and mounted on the axle adjacent to one of the drive wheels, and a power transmitting assembly mounted on the axle adjacent to the other drive wheel, the engine being located between the final output gear and the power transmitting assembly. A crankshaft extends parallel to the axle and supports on one end a flywheel for a generator and on the other end a clutch including a speed changing device. The drive unit is unitized, compact in size, simple in structure, and requires a minimum number of parts.

Abstract: A drive unit mounting structure for a three-wheeled vehicle which has a rear fork pivotably connected to a vehicle body and supporting thereon a drive unit. In order to suppress hopping movements of the vehicle, front and rear portions of the drive unit are pivotably mounted by front and rear link members on the rear fork. The front link member has a longitudinal axis extending obliquely, when viewed in side elevation, toward a point where a pair of rear wheels drivably coupled to the drive unit contacts the ground. The front and rear link members include rubber mounts for dampening vibrations of the drive unit in operation.

Abstract: An air driven vehicle utilizes pressurized air contained in storage tanks for actuating double-acting cylinders which in turn transmit a driving force to an axle of the vehicle. The compressed air in a first air tank under high pressure is fed to a first actuating cylinder so as to drive a crank which operates a main drive gear in communication with an axle gear attached to the vehicle axle. Upon a reversal of movement of the piston contained in the first actuating cylinder, a supply of exhaust air is directed from the cylinder to a second air pressure tank in which the exhaust air is collected under a lower pressure than the air contained in the first air pressure tank.

Abstract: A safety automobile is reduced in width compared to conventional vehicles and tapers forwardly to nearly a point to minimize head-on collision danger and provide lateral deflection of the vehicle to left or right on striking an obstruction. A dual power system is provided for maximum economy. A rear wheel electric drive is used for short range in-town operation and a front wheel internal combustion engine drive is employed for long range travel. The two drives are independent and can be employed simultaneously in heavy weather or in off-road situations.

Abstract: The device in accordance with the invention operates and controls the tilt of a body of a vehicle and is operated by a driving shaft driven in rotation by movement of the vehicle. A rocking mechanism that is capable of being driven in two opposite directions by the driving shaft employs two disengageable coupling assemblies to operate rocking of the body, each in one direction. Progressive engagement of one or other of the coupling assemblies is operated directly by a pendular mass. Deviation of the latter to one side or the other of a plane passing through its axis of oscillation and parallel with the median plane of the body, causes progressive engagement of that one of the two coupling assemblies. This causes rocking of the body in a direction which enables the median plane of the latter to be brought back into the direction of the apparent vertical passing through the axis of oscillation and the center of gravity of the pendular mass.

Abstract: A three-wheeled motorcycle having a front body portion including a relatively low floor which carries a fuel tank and a battery which are located on a floor having footrests, and below a reference level tangential to the front and rear wheels at their upper edges. The fuel tank and battery are covered with an upper hood and a lower protective cover. With the relatively heavy fuel tank and battery being disposed at a relatively low level, the motorcycle is stabilized for improved maneuverability during driving and parking, and has a wide space available for driver's activity or storing baggage.

Abstract: A three-wheeled, motor-driven, pedal-started vehicle which comprises a tubular frame supporting the wheels in triangular relationship. A seat is provided on the frame covering a trunk or receptacle relative to which the seat is pivotable in order to uncover the trunk or receptacle. A motor and pedal arrangement is provided on the frame for driving one of the wheels. A kickstand is provided to elevate this wheel selectively from the ground to facilitate the starting of the vehicle without the need for driving the weight of the same. A demountable canopy is detachably connected to the tubular frame and provides a transparent shield for the driver of the vehicle. The seat is such as to be able to accommodate the driver and at least one passenger in side by side relationship. A steering arrangement is provided having a jog therein to accommodate the offset relationship of the driver to the central axis of the vehicle when a passenger is accommodated.

Abstract: An all-terrain motorcycle attachment device for attachment to a two-wheel motorcycle to convert the motorcycle to a three-wheel all-terrain vehicle is disclosed comprising a swingarm frame adapted for detachable connection to the swingarm pivot bolt assembly of a motorcycle, an axle rotatably mounted to the swingarm frame and supporting a pair of wheels, a drive sprocket connected to the axle, a brake assembly adapted for detachable connection to the brake rod of a motorcycle and a mount for detachably connecting the rear shock absorbers of a motorcycle to the swingarm frame.

Abstract: A three-wheeled motor vehicle has a container for clothes and other things that is supported between a pair of channel-shaped bars extending rearwardly from the vehicle frame between a pair of rear wheels. The container has a pair of front resilient rollers disposed laterally thereof and fitted in a pair of respective channels fixed to and disposed in the channel-shaped bars, and a pair of rear resilient rollers fitted in the channel-shaped bars. The front resilient rollers are retained against forward movement by front vertical portions of the channels. The rear resilient rollers are retained against rearward movement by stop plates on a U-shaped guard fastened to the channel-shaped bars. The container is stably supported on the bars by the resilient rollers against vibrations and impacts.

Abstract: An improved form of three-wheeled vehicle of the type having a front wheel arranged in the longitudinal plane of symmetry of the vehicle and a pair of rear wheels arranged symmetrically with respect to the vehicle plane. The pivot joint interconnecting the front and rear frames of the vehicle has a turning axis offset from the vehicle plane to that side of the vehicle on which the driving rear wheel is arranged and extending in a direction inclined laterally outwardly from rear to front of the vehicle. Such pivot arrangement is highly effective to improve the driving stability of three-wheeled vehicles of the type concerned, without involving any structural complication or increase in cost of production.

Abstract: A fork lift truck having a frame provided with widely spaced forward supporting wheel points is directly supported on the ground through a laterally shiftable mast at a third supporting point which shifts with the mast so that increased stability is obtained.

Abstract: A narrow gauge, hydrostatic-drive tractor comprises an air-cooled prime mover, a Sundstrand hydraulic transmission mechanically coupled thereto, a fixed-displacement hydraulic motor hydraulically coupled to the Sundstrand transmission, an air conduit extending vertically upward from the fan housing of the prime mover for supplying ambient air to cool the prime mover, and cooling device disposed in the air conduit functioning to cool the hydraulic fluid. The motor is disposed beneath the fan housing and is coupled through a differential to drive wheels which, advantageously, have a diameter substantially the same as the width of the tractor. Advantageously, also, a manually-operated selector valve and a pressure-actuated cross-over relief valve is provided for by-passing the motor to protect the motor and to permit the tractor to be moved manually. There is also disclosed a scraping device for use with the above or like narrow gauge tractor.