CDL engine pre-trip

CDL ENGINE COMPARTMENT
Click on any photo to enlarge

Proper CDL pre-trip means good troubleshooting:
PART and PROBLEM.

Air filter -- holes; dirty when indicated by vacuum gauge
Hoses -- leaks, loose clamps
Belts -- >3/4" play, fraying, cuts, missing
Wires -- loose, cut, no insulation
Fluid filters -- leaks
Alternator -- loose bolts, loose wires at rear
Water pump -- leaks, it's belt driven

Air brake compressor -- air leaks, fluid leaks, no belt so it's gear driven
Steering fluid pump (not visible) -- leaks, no belt so it's gear driven
Air governor (not visible) -- not cracked

Oil dipstick -- engine off, remove & clean, seat, remove & read, fill if needed
Transmission dipstick -- engine idling, remove & clean, seat, remove & read, fill if needed
Steering fluid dipstick -- remove & clean, seat, remove & read, fill if needed
Coolant -- Fill when needed only when cold
Coolant reservoir -- leaks
Steering fluid reservoir -- leaks

Fan -- not turning, scraping
Radiator -- leaks, blockage (from debris)
Fan motor -- leaks