When conducting an under-the-hood evaluation of a commercial vehicle's powertrain and auxiliary systems, a driver must verify specific assemblies against standard safety tolerances. Match each engine compartment component on the left with its corresponding CDL inspection standard on the right.
- Accessory drive belts (alternator, water pump, compressor)Verify play does not exceed 1/2 to 3/4 inch at the center of the span, and ensure there is no visible fraying, cracking, or loose tension.
- Engine oil dipstickEnsure the level is above the refill mark and within the safe operating zone with the engine stopped.
- Power steering fluid reservoir and hydraulic linesCheck that the level is above the add mark, with the housing securely mounted and lines free of leaks or chafing.
- Coolant recovery reservoir and radiator hosesConfirm the level is visible in the reservoir or sight glass, the pressure cap is secure, and flexible lines show no swelling, cuts, or leaks.
Cevap
Accessory drive belts match with 1/2 to 3/4 inch play tolerance and no fraying; Engine oil dipstick matches with level above refill mark in safe zone; Power steering reservoir and lines match with level above add mark and leak-free hydraulic hoses; Coolant reservoir and radiator hoses match with visible level in reservoir/sight glass and intact flexible lines.
Each commercial vehicle engine compartment subsystem has distinct diagnostic criteria: drive belts are evaluated for mechanical deflection up to 3/4 inch and structural cracking; engine oil is checked on the dipstick for safe level above the refill mark; power steering fluid and lines are verified for adequate reservoir level and hydraulic leak prevention; and the cooling system is checked for coolant expansion level, tight cap seal, and pliable, leak-free hoses.
Adım Adım Çözüm
Anahtar Kavram
Under-the-hood pre-trip inspection standards and defect tolerances for commercial motor vehicles.
Tahmini Süre:1m 15s