1. 10/4/2015 Lake Area Tech Diesel Technology DT220 Truck Preventive Maintenance

2. Heavy Duty Truck Systems Chapter 1 Introduction to Servicing Heavy-Duty Trucks

3. Without Trucks, America Stops

4. Trucking is vital to America General Information: The trucking industry is comprised of more than 500,000 for-hire, private and government fleets, including owner operators. It employs 9.7 million people, including 3.12 million drivers, and accounts for nearly 5% of the U.S. gross domestic product. Truly, trucking is an essential part of our economy and society.essential

5. Check out the American Trucking Association ATA http://www.truckline.com/index.

6. Weight Classifications Class 1 up to 6000 LBS GVW Class 26001-10,000 Class 310,001-14,000 Class 414,001-16,000 Class 516,001-19,500 Class 619,501-26,000 Class 726,001-33,000 Class 833,001 and over

7. Major manufacturers Freightliner Navistar Kenworth Mack Sterling Peterbilt Volvo Western Star

8. Cab Configurations ConventionalCab-over-engine

9. Cab Configurations Short conventionalLow cab forward

10. Truck Classification TRUCK TOTAL WHEELS DRIVEN WHEELS TOTAL AXLES DRIVE AXLES 4X24221 4X44422 6X26231 6X46432 6X66633 8X48442 8X88844

11. Truck and Trailer dimensions

12. Electrical systems Batteries Alternator Starter Series/Parallel switch Lighting Accessories

13. Clutches Two plate clutch Push type Pull type Clutch brake

14. Transmissions Twin countershafts Triple countershafts Automatic (Allison) Auto-shift (2 or 3 pedal) Lubrication Oil coolers

15. Drive shafts End yoke U-joint 1610 size is 5.312” across the lugs 1710 size is 6.094” across the lugs 1760 size is 7” across the lugs 1810 size is 7.547” across the lugs

16. Axles Weight rating –Steering axle—8,9, 12, 14, 16K lbs –Single rear axle—14, 17, 19, 23K lbs –Tandem axles—34, 36, 38, 40K lbs Power divider Axle ratio –Find numbers on end of pinion shaft on rear-rear axle

17. Steering Manual –Worm and roller, recirculating ball, cam and lever types Hydraulic Power assist Air power assist Integral power steering (most common) –TRW (Ross) –Sheppard

18. Suspension systems Hendrickson equalizing beam

19. Four Spring Four spring

20. Four air springs (bags)

21. Torsion bar Eight bag (Kenworth)

22. Wheels and Tires Cast spoke (Dayton) Steel disc (Budd) Aluminum disc Stud piloted Hub piloted

23. Brakes Hydraulic drum Hydraulic disc Air S-cam Air wedge Air disc NHTSA FMVSS 121 ABS senders/modules (6S/6M)

24. Retarders Jacobs engine brake Mack Dynatard® Cat Brakesaver® Exhaust brake Electrical retarder

25. Chassis Frame Rails Crossmembers Flange Web

26. Fifth wheel Stationary Sliding Air slide elevating

27. HVAC Cab HVAC Sleeper HVAC APU

28. Electronic controls Engines Transmissions ABS Safety radar multiplexing

29. Fleet operations Linehaul JIT LTL P&D Courier DCC Vocational Renting and leasing O/O

30. Shops Fleets Dealerships Independent Specialty shops others

31. Jobs Service tech Specialty tech Service writer Parts manager Shop supervisor Service manager

32. As always, read the summary Remember, without trucks America stops