Before performing service work under a raised dump body or loader bucket, what is the correct procedure to prevent the implement from dropping?
Safety Common Skills
Question · Easy
Lockout/tagout, called like a cup final
Short
When de-energizing a machine for service, lockout/tagout requires that the energy-isolating device be secured so that it:
Canadian program, law since 1988, that requires supplier labels, training and documents describing dangerous products used on the job.
Chemical handling
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Chapter 1: Safety, Regulations & Environmental Compliance
1.1 Workplace Safety, PPE, Lockout/Tagout & Zero-Energy State
Study guide
A WHMIS 2015 Safety Data Sheet (SDS) is organized into how many standardized sections, and which section lists first-aid measures?
Question · Medium
Read the clue and guess the term in 6 tries.
Game
When rigging a load with a sling, what does the term 'working load limit' (WLL) refer to?
Supplier document that must accompany a dangerous product when it is sold, covering its dangers, correct handling, storage and first aid.
Why must a technician never use compressed air above roughly 200 kPa (about 30 psi) to clean clothing or blow debris off skin?
Spin the wheel: name the extinguisher
A hydraulic hose develops a pinhole leak under high pressure. Why is it dangerous to run a hand along the hose to find the leak?
Exhaust device that traps soot and burns it off during regeneration, with reductions greater than 85 percent.
Engines and emissions
1.2 WHMIS 2015/GHS, Hazardous Materials & Environmental Regulations
Which class of fire extinguisher is appropriate for a flammable-liquid fire such as burning diesel or hydraulic oil?
Swap tiles to line up three of the same term.
Term Match
Before welding near a machine's electronic control modules, what is the recommended practice to protect the ECMs?
Question · Hard
Emission strategy in which a valve sends a controlled share of spent combustion products back into the intake, lowering peak combustion temperature to cut NOx.
What is the primary reason a technician should wear a face shield in addition to safety glasses when grinding?
When charging a maintenance-free lead-acid battery indoors, the main reason for adequate ventilation is that charging produces:
Consumable kept in its own tank and injected upstream of the SCR catalyst to cut NOx; running out can force a drastic speed cut or shutdown.
1.3 Fire Prevention, Emergency Preparedness & Stored-Energy Hazards
A four-stroke diesel engine completes its cycle in how many crankshaft revolutions, and how many strokes?
Engines And Fuel
Flip two cards at a time to find matching terms.
Term Pairs
Diesel engines ignite fuel by which method?
Wheel at the front or rear of the track frame that guides the chain in and out of the track rollers.
Steering, brakes and tracks
Typical compression ratios for a direct-injection heavy-duty diesel engine fall in which range?
In a high-pressure common-rail (HPCR) diesel fuel system, what is the main advantage of decoupling injection pressure from engine speed?
___ adjuster: crank lever that turns a brake chamber's pushrod motion into camshaft twist and sets free play as linings wear.
Chapter 2: Trade Tools, Fasteners, Rigging & Shop Practices
2.1 Precision Measuring Tools & Diagnostic Instruments
A unit injector (HEUI or electronic unit injector) differs from a common-rail injector in that the unit injector:
Find five hidden terms in a grid of letters.
Term Search
What is the function of a turbocharger wastegate on a diesel engine?
Wheel angle measured from vertical when the machine is viewed head-on; positive means the tire's top leans away from the body.
A charge-air cooler (aftercooler) improves engine performance primarily by:
Valve lash (valve clearance) on a diesel engine is set to:
Message protocol, standardized as ISO 11898, that lets a machine's electronic modules share one data link, each message winning access by identifier priority.
Electrical systems
2.2 Fasteners, Thread Pitch, Grades & Torque-to-Yield Procedures
Excessive blue-grey exhaust smoke from a diesel engine most commonly indicates:
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In a diesel exhaust aftertreatment system, the diesel particulate filter (DPF) primarily:
Onboard computer, also called the ECU, that reads a network of sensors to adjust fuel injection and timing and logs diagnostic trouble codes.
Selective catalytic reduction (SCR) reduces NOx emissions by injecting diesel exhaust fluid (DEF), which is a solution of:
What is the purpose of exhaust gas recirculation (EGR) on a modern diesel engine?
Battery rating tested at -18°C: the current a new, fully charged battery can supply for 30 seconds while holding 7.2 volts at its terminals.
2.3 Rigging Hardware, Slings, Crane Hand Signals & Hoisting Safety
When performing a cylinder compression test on a diesel engine, what is the most important preparation step compared with a gasoline engine?
A primary fuel filter with a water separator is installed in a diesel fuel system mainly to:
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