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Unit – 3 Inspection & Dynamics. The inspection process may seem routine but every trip changes things. Always inspect carefully. Inspections & Maintenance Objectives. Understand the value and importance of regular inspections of emergency vehicles. - PowerPoint PPT Presentation
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© 2006 PSEN
Unit – 3 Inspection & Dynamics
The inspection process may seem routine but every trip changes things. Always inspect carefully.
© 2006 PSEN
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
© 2006 PSEN
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
© 2006 PSEN
Types of Preventative Maintenance
• Routine Maintenance
• Scheduled Maintenance
• Crisis Maintenance
© 2006 PSEN
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)
© 2006 PSEN
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
© 2006 PSEN
Role of the Emergency Vehicle Driver
• Battery or Batteries• Coolant System• Electrical System• Fuel• Hydraulic Fluids• Braking System
© 2006 PSEN
• Braking Systems
– Anti-Lock Braking System (ABS)
– Secondary or Auxiliary Braking Systems
• Engine Brake• Automatic Transmission
Retarder• Driveline Retarder
Vehicle Characteristics
© 2006 PSEN
• Routine– Fluid level checks– Wheels and tires– Electrical system and devices
Types of Preventative Maintenance
© 2006 PSEN
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
© 2006 PSEN
• Document the need for maintenance on the assigned vehicle
• Verify that the request and needed maintenance was performed.
Role of the Emergency Vehicle Driver
© 2006 PSEN
• Scheduled
– Manufacturer's recommended schedule
– Amount of use– Organizational policy– Professional standards
Types of Preventative Maintenance
© 2006 PSEN
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
© 2006 PSEN
• Friction
• Velocity
• Momentum
• Inertia
• Centrifugal Force
Physical Forces
© 2006 PSEN
• 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
© 2006 PSEN
• 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
© 2006 PSEN
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
© 2006 PSEN
Centrifugal Forces
© 2006 PSEN
• 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
© 2006 PSEN
– Cleaning of the vehicle
– Replacing supplies
– Re-fueling and checking fluid levels
– Report any unusual occurrences or malfunctions.
Inspections – Post-Trip
© 2006 PSEN
Unit – 3 Inspection & Dynamics