Download - Unit – 3 Inspection & Dynamics
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© 2006 PSEN
Unit – 3 Inspection & Dynamics
The inspection process may seem routine but every trip changes things. Always inspect carefully.
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1. Understand the value and importance of regular inspections of emergency vehicles.
2. Identify the major component system of an emergency vehicle.
3. Understand how to perform pre and post-trip inspections.
Inspections & Maintenance Objectives
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4. Understand the various classes of PM and the importance of a PM program for emergency vehicles.
5. Recognize the role of the driver in inspections and maintenance.
6. Understand the importance of keeping accurate and complete records.
Inspections & Maintenance Objectives
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Types of Preventative Maintenance
• Routine Maintenance
• Scheduled Maintenance
• Crisis Maintenance
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Vehicle Inspection Vehicle Inspection
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Inspections – Pre-Trip
– Vehicle overview
– Check engine compartment
– Start engine and check inside cab
– Check headlights, signal lights, warning lights and audio devices
– Conduct walk around inspection
– Check controls and indicators
– Check brake system (air brakes)
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Check the Log
• Maintenance Records• Operational Records
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• Chassis
• Frame• Suspension System• Steering & Braking
System• Power Train
Components
Emergency Vehicle Components
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• Suspension Systems
1. Axles2. Springs3. Wheels
Vehicle Characteristics
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• Lubrication• Oil (Engine)• Tires• Steering System• Belts• Tools, Appliances, and
Equipment
Role of the Emergency Vehicle Driver
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Role of the Emergency Vehicle Driver
• Battery or Batteries• Coolant System• Electrical System• Fuel• Hydraulic Fluids• Braking System
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• Braking Systems
– Anti-Lock Braking System (ABS)
– Secondary or Auxiliary Braking Systems
• Engine Brake• Automatic Transmission
Retarder• Driveline Retarder
Vehicle Characteristics
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• Routine– Fluid level checks– Wheels and tires– Electrical system and devices
Types of Preventative Maintenance
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Vehicle Inspection Vehicle Inspection
4/32” Front tires
2/32” Rear tires
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Vehicle Inspection Vehicle Inspection
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Preparing to Drive
• Effective Start-Up Procedures
– Circle of Safety Inspection– Adjustment of cab features– Wearing of occupant restraints– Receive signal before moving
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• Document the need for maintenance on the assigned vehicle
• Verify that the request and needed maintenance was performed.
Role of the Emergency Vehicle Driver
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• Scheduled
– Manufacturer's recommended schedule
– Amount of use– Organizational policy– Professional standards
Types of Preventative Maintenance
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Vehicle Forces and Dynamics
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• Understand the physical forces which act upon vehicles and their impact upon vehicle handling.
• Recognize that certain vehicle characteristics can influence the impact of physical forces on emergency vehicles
Vehicle Dynamics Objectives
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• Friction
• Velocity
• Momentum
• Inertia
• Centrifugal Force
Physical Forces
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• Total Weight and Weight Distribution
• Suspension system
• Braking system
• Baffling system
Vehicle Characteristics
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• Total weight and weight distribution.
– Gross Axle Weight Rating (GAWR)– Gross Vehicle Weight rating (GVWR)– Weight Distribution – horizontal & vertical centers of
gravity
Vehicle Characteristics
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• Momentum – is measures as the product of the object’s mass or weight times its velocity
• Inertia – is the force it takes for a moving object to stay in motion in the same direction
Physical Forces
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Physical Forces
• Directional Control is a derivative of three (3) factors
»Steering»Turning»Tracking
• Directional Control is a derivative of three (3) factors
»Steering»Turning»Tracking
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Centrifugal Forces
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• Friction – resistance to motion between two moving objects that touch.
• Tire/Road Friction• Brake Friction• Steering Friction
Physical Forces
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Tire Blowout
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• Velocity – Velocity is Speed
»Acceleration
»Deceleration»Braking
Physical Forces
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Braking & ABS
• Acceleration
• Deceleration• Braking
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Post Trip ConsiderationsPost Trip Considerations
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– Cleaning of the vehicle
– Replacing supplies
– Re-fueling and checking fluid levels
– Report any unusual occurrences or malfunctions.
Inspections – Post-Trip
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Unit – 3 Inspection & Dynamics