Freightliner Truck 108SD: Daily Pretrip Inspection and Maintenance

springs

• Pass
• Flag
• Fail

spring hangers

• Pass
• Flag
• Fail

shocks

• Pass
• Flag
• Fail

suspension arms

• Pass
• Flag
• Fail

suspension brackets

• Pass
• Flag
• Fail

axle seats

• Pass
• Flag
• Fail

bushings

• Pass
• Flag
• Fail

Inspect slack adjuster boots, if equipped, for cuts or tears.

• Pass
• Flag
• Fail

Inspect anchor straps, if equipped, for damage.

• Pass
• Flag
• Fail

valve stem caps on every tire, screwed on finger-tight

• Pass
• Flag
• Fail

bulges, cracks, cuts, and penetrations

• Pass
• Flag
• Fail

oil contamination (petroleum derivatives will soften the rubber and destroy the tire)

• Pass
• Flag
• Fail

tread depth—if tread is less than 4/32 inch (3 mm) on any front tire, or less than 2/32 inch (1.5 mm) on any rear tire, replace the tire

• Pass
• Flag
• Fail

debris lodged between duel tire sets

• Pass
• Flag
• Fail

Check air pressure build-up time.

• With the air system fully charged, make one full brake application and note the air pressure reading on the primary air gauge.

• Further reduce air pressure using moderate brake applications, then run the engine at governed rpm.

• Note the time that the pressure reaches the previously noted reading on the primary air gauge, then note the time that the air pressure reaches cut-out pressure.

• If it takes longer than 30 seconds to reach cut-out pressure after the primary air gauge passes the previously noted pressure (noted after one full brake application), eliminate any leaks or replace the air compressor before operating the vehicle.

Check air leakage in the system.

• With the parking brake applied, the transmission out of gear, and the air system fully charged, release the service brakes and shut down the engine.

• Wait one minute and note the air pressure drop in psi (kPa) per minute from the primary air reservoir.

• If the pressure drop exceeds the limits shown in Table 21.1, eliminate any leaks before operating the vehicle.

Check the air pressure reserve.

• With the engine still off, make one full brake application and observe the pressure drop on the primary air gauge. If pressure drops more than 25 psi (172 kPa), eliminate any leaks before operating the vehicle.

Check for fault codes.

• Turn the ignition switch to the ON position and check the instrumentation control unit (ICU3) for fault codes. Have any active fault codes serviced before operating the vehicle.

Check the operation of all interior lights.

• Turn on the headlights and leave them on. Ensure all equipped gauge bulbs illuminate in the dash message center.

• Ensure all equipped driver control switches illuminate.

• Ensure both turn signal indicator bulbs illuminate in the dash message center when the turn signal switch is activated.

Check the operation of all exterior lights. See Fig. 21.8.

• Activate the high-beam headlights and hazard warning lights.

• Exit the cab and check that all exterior lights and reflectors are clean and intact.

• Check that the brake lights, taillights, headlights, turn signals, marker lights, identification lights, and clearance lights are working properly.

Inspect the seat belts and tether belts.

• Check the web for fraying, cuts, extreme dirt and dust, or for severe fading from exposure to sunlight, especially near the buckle latch plate and in the D-loop guide area.

• Check operation of the buckle, latch, Komfort Latch or Sliding Komfort Latch (if equipped), web retractor, and upper seat belt mount on the door pillar. Check all visible components for wear or damage.

• Check the seat belt and tether belt connection points and tighten any that are loose.

Adjust the rearview and down view mirrors as necessary.

• With the engine running and air system fully charged, set the parking brake.

• Put the vehicle in the lowest gear and gently attempt to move it forward. The vehicle should not move.

• If the vehicle moves, the parking brakes are not operating correctly and must be repaired before the vehicle is operated.

Inspect fuel tanks for dents, scratches, gouges, or other signs of damage. Inspect the fuel lines and connections for leaks.

• Check that the fuel tanks are securely mounted. Look for signs of abrasion between components.

• Compressed Natural Gas (CNG) Fuel System: Ensure that the CNG fuel cylinder storage box is secured to the frame. Inspect for signs of looseness.

• Liquefied Natural Gas (LNG) Fuel System: Ensure that the LNG fuel tank is secured to the mounting brackets and that the mounting brackets are secured to the frame. Ensure all rubber isolator straps are secure around the LNG fuel tank.

Check for the presence of all required decals present in the following locations:

• Gas detection system overhead console;

• Above the door handle on both doors;

• Left front bumper;

• End-of-frame crossmember;

• LNG fuel tank fill port (maximum psi), if equipped.

Check for the presence of vent caps on pressure relief valves and devices. If any caps are miss- ing, have the fuel system inspected by a quali- fied technician.

• CNG Fuel System: Each fuel cylinder should have two caps (one on each end), which are visible on the back of the CNG fuel cylinder storage box. One additional cap is located on the pressure relief valve on the inboard side of the CNG fuel box, next to the fuel outlet line.

• LNG Fuel System: A red cap should be present on the secondary relief valve (Fig. 21.9).

Inspect all plumbing components, including the fuel shutoff valve(s), primary and secondary relief valves, and the LNG vapor shutoff and excess flow valves, if equipped, for signs of damage or leaks. See Fig. 21.9 or Fig. 21.10.

• Inspect the fuel fill fitting for signs of damage or leaks.

• Inspect all lines for signs of leaks or damage, and check all threaded connections.