All essential driving controls are brought to a single vertical control column. Forward movement of the column opens the throttle providing control of power from the engine. Returning the control column to neutral returns the throttle to idle position. Movement of the column to neutral returns the throttle to idle position. Movement of the column toward the rear applies the vehicle brakes in proportion to the pressure applied to the column.
At the top of the column is a cross arm with a mini steering wheel directly in front of the center of the driver. Rotation of the wheel Left or Right steers the vehicle.
All systems are amplified so that the power and range of motion required of the driver are reduced to a minimum. The system provides for a minimum of 6 ounces of force required in the fore and aft and lateral planes.
For persons who do not have finger dexterity or wrist function, such as high-level spinal cord injury, a Tri-pin device mounted at the top of the vertical column with a parallel arm support provided.
The steering control is a closed loop Servo mechanism. The loop is closed by mechanical linkage; the linkage is adjustable to provide two ratios. When the steering wheel is used 270 degrees of rotation is provided. When the tri-pin is used 180 degrees of rotation is provided.
Two hydraulic power systems are provided. The primary system is the engine driven pump. A separate secondary or emergency system using an electrically driven pump is also provided which will engage automatically if the primary system fails to provide adequate Hydraulic Flow, this provides continuous steering power. A manual override is also provided for the emergency system.
The Braking System
The braking system is vacuum boosted. Reduced pressure provided by the engine intake manifold is stored in a large tank with a check valve to assure retention of pressure. The control column is mechanically connected to the normal power brake system. In addition, a separate actuator controlled by a vacuum servo valve in the mechanical link between the column and the primary system provides a backup booster system. Each system is independent of the other and either will provide adequate braking.
All of the engine and driving controls are brought to a special control box on which light pressure push button switches allow the driver full control of all electrical circuits including electrical shift actuator and front window controls. The column box can be placed anywhere convenient to the driver and any controls needed can be duplicated at any location. All electrical interface controls are located in one relay box generally located beneath the dash directly in front of the driver. Aircraft type manual and automatic circuit breakers are provided for all internal circuits. The fuse panel in the van (located on the fire wall directly ahead of the driver protects the van circuits. All electrical systems & components are plug in modular units to make field service easier.
General Service Recommendations
Routine preventative maintenance procedures are the least expensive and most effective insurance against unexpected mechanical failures available.
Follow faithfully the manufacturers service recommendations as outlined in the booklet provided with each vehicle.
We recommend two exceptions as follows:
Oil change and Lubrication
Most of the Scott systems vehicles are operated on basically shorter runs, which tends to shorten the life of the lubricants. Therefore, we suggest that the engine oil and filter should be changed at 3,000 to 3,500 mile intervals. Always have the chassis lubricated at the time of the oil change, especially in wet weather.
No routine servicing of the driving system is required except to maintain the level of oil in the power steering fluid reservoir. All other portions of the system have a lifetime self lubricated and sealed bearings. No additional services or lubrication is required.
The power steering reservoir is located under the hood at the front of the van. It is to the right of center facing the front of the van.