ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) case studies
ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) · Put your knowledge to work in context.
ASE T8, Preventive Maintenance Inspection for Medium/Heavy Trucks, is one of the specialty credentials in the ASE testing program for professional technicians. It targets technicians who perform scheduled inspections and service on Class 3 through Class 8 trucks - the work that catches worn components, leaks, and out-of-adjustment systems before they become roadside breakdowns or out-of-service violations. The ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) case studies are 5 cases and about 2,457 words.
1Pre-Trip Air Brake Check After Wheel Seal Replacement
A 2019 tandem-axle tractor with a 3-axle trailer is in the shop for a leaking right rear drive wheel seal. The technician replaces the seal, repacks the bearings, refills the hub to the fill line, and reinstalls the wheel.
506 words, about 3 min2Intermittent No-Crank on a Day Cab
A 2017 Class 8 day cab with a 12.7L engine and automated manual transmission will not crank intermittently - roughly 1 in 5 key cycles. The driver reports it happens more often after the truck sits overnight in cold weather and after fueling.
500 words, about 3 min3PMI Discrepancies on a High-Mileage Sleeper
A 2015 sleeper tractor with 612,000 miles comes in for a scheduled PMI. The previous inspection sheet (90 days ago, 598,000 miles) noted: left steer tire at 6/32", right steer at 7/32", front brake lining at 40%, rear drive linings at 25%, and a "minor" power steering seep at the gear box.
483 words, about 2 min4Coolant Loss and Oil Analysis on a Vocational Truck
A 2016 vocational dump truck with a 13L diesel and 340,000 miles is in for PM. The operator reports adding about 1 gallon of coolant every 1,500 miles for the last month, no visible puddle, and the coolant reservoir is dark.
454 words, about 2 min5Fifth Wheel and Suspension Findings at Annual Inspection
A 2018 tractor with air-ride rear suspension and a sliding fifth wheel arrives for an annual inspection. Findings: the fifth wheel jaw shows visible wear and the lock will close but the release handle has about 1/2" of free play before it engages; the air-ride height is 1" below spec at the drive axle; one rear shock has a light oil mist on the body; the left rear air spring has a small abrasion mark but holds air; and the driver reports the trailer "feels loose" in turns.
514 words, about 3 min