Drive
Engines
The Kubota 3.8L High Output Tier 4 Final turbo diesel engine and the standard Kubota 3.8L DOC Tier 4 Final turbo diesel engine both utilize a two piece cylinder block for outstanding durability while reducing engine noise. Cylinders are cast into the block for optimum durability and cooling efficiency. Cylinder heads feature a helical, 4-valve “Crossflow” design within each cylinder to create additional airflow into the cylinder for added power. The turbocharger is of a simple design, but uses a variable waste-gate to ensure the proper amount of boost at all engine speeds. Both engines are certified to EPA Tier 4 Final emissions standards.
Cooling System
The cooling system employs a modular radiator system, with sections for engine coolant, transmission oil, and engine intake (charge) air. An 18” diameter blade pusher-type fan provides cooling air flow. A permanently lubricated water pump and a high capacity, cross-flow radiator ensure rapid heat dissipation. The sealed cooling system operates at a pressure of 15 psi and includes a coolant recovery tank for visual inspection of coolant level. The radiator is soft-mounted for excellent durability.
Drive Axle
The drive axles are designed to withstand heavy loads and absorb shocks. The wheel hubs rotate on large tapered roller bearings. The drive shaft transmits rotational torque to the drive axle from the engine and transmission. Transmission torque is distributed through planetary gear reduction and an industrial hypoid ring gear and pinion assembly. The drive axle is a “self contained” assembly that is isolated from the transmission by the drive shaft and heavy duty rubber isolators. The axle shafts utilize a “rolled fillet” root spline design for increased resistance to torsion stress. A magnetic sump plug is used to collect any metal particles that are circulating in the axle oil, preventing component wear.
Hydraulic Power Steering
Hydraulic Power Steering (hydrostatic steering) provides responsive control and eliminates mechanical linkages for reduced surface shock and simplified maintenance. The steering wheel is 12 inches in diameter with a textured surface grip and spinner knob, and requires only four turns lock-to-lock. The center mounted steer cylinder is located within the confines of the steer axle for protection.
Steer Axle
Constructed of cast ductile iron and mounted on phenolic bushings, allows the steer axle excellent stability and axle articulation. The steer axle system features tapered spindle bearings and non-adjustable tie rod ends for durability.
Hydraulic System
Incorporating a gear type pump with a cast iron body for quiet operation, the hydraulic system is protected from overfilling by a main relief valve for the lift circuit and a secondary relief valve for all other auxiliary functions. Oil is double filtered through a 10 micron suction line strainer and 10 micron return line filter. The hydraulic tank is integrated into the frame. An emergency lowering valve is provided to allow the load to be lowered in the event of power loss. O-ring face seal fittings are used in all high pressure hydraulic connections.