IICL Chassis Inspector Exam with Complete Solutions.docx

IICL Chassis Inspector Exam with Complete S What is traction control? - Answer-Helps the ABS improve vehicle traction by minimizing wheel slip on the drive axle during acceleration. What is ABS? - Answer-Antilock braking systems are electronic systems that monitor and control wheel slip during vehicle braking. What are the components of ABS? - Answer-electronic control unit (ECU), wheel speed sensors, modulator valves, exciter rings In ABS, what is the function of the electronic control unit (ECU)? - Answer-Processes all ABS info and signal functions. Receives and interprets voltage pulses generated by the sensor pickup as the exciter teeth pass by, and uses this info to determine: (a) impending wheel lock, and (b) when/how to activate the ABS modulator valves. In ABS, what is the function of the modulator valves? - Answer-Regulate air pressure to the brakes during ABS action. ECU commands mod valve to either change the air pressure to the brake chamber, or hold the existing pressure. In ABS, what are the 2 main components of the wheel speed sensors? - Answer-(1) exciter, and (2) pickup In ABS, what is an exciter? - Answer-A ring with notched teeth, also known as sensor ring, tooth wheel, tone ring, and exciter. In ABS, what is an pickup? - Answer-Commonly called "the sensor" which contains a wire coil/magnet assembly, which generates pulses of electricity as teeth of the exciter pass in front of it. Which pin/wire is the power supply for ground on a 7-way plug? - Answer-Pin 1 - white Which pin/wire is the power supply for stop and antilock on a 7-way plug? - Answer-Pin 2 - red Which pin/wire is the power supply for power for electronic control unit (ECU) on a 7- way plug? - Answer-Pin 3 - blue Which pin/wire is the power supply for identification, front and intermediate markers, front clearance, rear markers, license, tail and rear clearance on a 7-way plug? - Answer-Pin 4 - brown Which pin/wire is the power supply for right directional on a 7-way plug? - Answer-Pin 5 - green Which pin/wire is the power supply for left directional on a 7-way plug? - Answer-Pin 6 - yellow Which pin/wire is the power supply for ABS warning light on a 7-way plug? - Answer-Pin 7 - green/white What is the transition area? - Answer-Location where the gooseneck meets the main rails What is a "horn" on a chassis? - Answer-Large gathering structure extending above the top flange of the front of the chassis. It is a gathering device used to guide containers lifted on/off chassis, and to restrict forward movement. What is a kingpin? - Answer-Critical structural member and connecting link between the chassis and the tractor fifth wheel. What is the inspection criteria for kingpin? - Answer-Excessive wear beyond acceptable limits; chipped, broken, or cracked collar; looseness in upper coupler construction What is the required diameter of a kingpin? - Answer-Upper section: between 2-11/16" & 2-7/8" Lower section: between 1-7/8" & 2" What is the inspection criteria for the upper coupler plate? - Answer-Examine for gouges from fifth wheel, lubricated with grease, excessive/uneven wear, dishing, bulging, or distortion upwards. Check for corrosion and/or blockage of drain holes. What is the inspection criteria for the main rails? - Answer-Sight along main rails to notice deformation (twist, bow, dent, or bend) in framework; examine frame welds for cracks What is the deciding factor in repairing main rails? - Answer-Rails must be repaired when deformation influences the ability of a container to be seated properly and secured to the chassis, or its ability to track properly. What is the inspection criteria for the landing legs? - Answer-Inspect support mounting brackets for bending and tight bolts; bolt holes on brackets and legs are same size; missing/damaged bolts replaced; uneven height; out of alignment (out of plumb condition in all directions) What are the components of the landing gear? - Answer-Landing leg brace (diagonal or cross brace), landing legs, gear box, cross shaft, crank handle, crank handle retainer, sand shoes (or wheels), sand shoe axle What is the inspection criteria for ICC bumpers? - Answer-Must not lie more than 22" from road surface What is another name for ICC bumper? - Answer-Under ride protection What is the maximum height of an ICC bumper from the road surface? - Answer-22" Under USDOT rules, what are the requirements of ICC bumper measurements? - Answer-a) Must extend to within 4" of max width of chassis, but not extend beyond side extremity b)Must be within 12" of the rear extremity When must a damaged ICC bumper be repaired? - Answer-Bending of hangars or struts to where protection zone has been displaced 2" or more from original position; damage causes safety hazard What is the inspection criteria for mud flaps? - Answer-a) Cover full tread of tire b) Tear more than 2" in length c)Approximately 6" above road What is the inspection criteria for mud flap brackets? - Answer-Check for deformity which causes mud flap or brackets to touch tires, ground/road or under ride protection. What are examples of securing devices? - Answer-Twistlocks, locking pins, index pins What are the restraining regulations for securing devices? - Answer-Must restrain a container from moving more than 1/2" in any horizontal direction or 1" vertically while chassis is in motion What is the inspection criteria for securing devices? - Answer-Determine if operate properly; look for missing components, bent shanks, bent levers, bent latches; check for missing springs, retainers, or handles; ensure there are no thrust collar weld separations. What are the 2 types of slider assemblies? - Answer-Sliding bogie and sliding frame (extendable)