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Backing up a tractor with a semi-trailer
combination Backing up a tractor-trailer is complex due to the articulation point where the units pivot, unlike backing a single-unit vehicle.
Key Rules
- ✓Turn your steering wheel in the direction opposite to where you want the trailer to go when you start backing up
- ✓Turn the steering wheel the other way as soon as the trailer begins to turn, matching the tractor's path to the trailer's to avoid jackknifing
- ✓A tractor-trailer backing into a normal right-angle turn follows an S-shaped curve
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Preventing trailer rollovers
combination A sudden movement could cause a trailer to roll over, a major cause of death among truck drivers. Loaded vehicles roll over more easily than empty ones.
Key Rules
- ✓Drive slowly around curves and make turns gradually — rollovers happen when you turn too quickly
- ✓Keep cargo close to the centre of the rig so it doesn't cause the trailer to lean, and spread it out low on the deck to lower the centre of gravity
- ✓A vehicle with a higher centre of gravity is more likely to roll over
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Towing double trailers
combination Towing two trailers increases the chance of jackknife or rollover; the last trailer is most likely to roll over.
Key Rules
- ✓Drive smoothly — accelerate, brake and steer smoothly, and allow extra following distance and time when accelerating, passing or overtaking
- ✓Couple the more heavily loaded trailer to the tractor with the lighter trailer behind
- ✓There is more offtrack with two trailers, so stay centred and remember extra length and articulation may encroach on adjacent lanes
- ✓Never unlock the pintle hook with the dolly still under the rear trailer as the tow bar may fly up causing injury
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Coupling with a fifth wheel
combination Coupling requires great care to protect your safety, your load and others. Follow the ordered steps for inspection, positioning, connection and testing.
Key Rules
- ✓Inspect the fifth wheel for damage/lubrication, ensure it's locked to the frame, tilted downward toward the rear, and coupler jaws are open
- ✓Block the trailer wheels and ensure spring brakes are applied (or connect air, charge, and apply brakes if no spring brakes) before backing under
- ✓Back up so the fifth wheel just touches the trailer apron directly above the pivot points; use lowest reverse gear and stop when the kingpin locks in
- ✓After connecting there must be no space or daylight between the fifth wheel and trailer apron, and the release handle must be locked
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Securing and tug testing the connection
combination After connecting, secure air/electrical lines and verify the coupling with a visual check and tug test.
Key Rules
- ✓Use a flashlight to check the locking jaws are securely closed around the kingpin, and remove keys so nobody moves the tractor while underneath
- ✓Raise landing gear until legs are slightly off the ground, then gently tug against the trailer parking brakes to check the connection holds
- ✓Check turning clearance between rear of tractor and trailer landing gear, and between the tractor cab and front of the trailer
- ✓At slow speed apply the trailer hand valve to check trailer service brake operation before pulling away
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Uncoupling a tractor and trailer
combination Uncoupling requires proper positioning, easing jaw pressure, and safely lowering the landing gear before separating units.
Key Rules
- ✓Line up the tractor and trailer straight and ensure the ground is level and will support the trailer
- ✓Ease pressure on the fifth wheel locking jaws by backing up gently, then set the parking brakes while pushing against the trailer
- ✓Block trailer wheels and lower landing gear until both supports touch the ground and pressure is off the fifth wheel before pulling the release handle
- ✓Keep clear of the tractor wheels while uncoupling as they may roll slightly when the jaws open; drain air suspension if fitted
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Backing Up a Tractor with Semi-Trailer
combination Backing up a tractor with a semi-trailer differs from a single unit due to the articulation point where it pivots. The steering must be turned opposite to where you want the trailer to go, then reversed as the trailer begins to turn. A tractor-trailer backing into a right-angle turn follows an S-shaped curve.
Key Rules
- ✓Turn the steering wheel opposite to where you want the trailer to go when starting to back up
- ✓Turn the steering wheel the other way as soon as the trailer begins to turn, so you're steering in the same direction the trailer is travelling
- ✓The tractor must follow a path matching the trailer's path or you risk jackknifing
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Towing Trailers and Preventing Rollovers
combination Towing requires more skill than a single unit. Sudden movements can cause a trailer to roll over, a major cause of death among truck drivers. A loaded vehicle is more likely to roll over than an empty one. Correct loading and low centre of gravity help prevent rollovers.
Key Rules
- ✓Drive slowly around curves and make turns gradually as rollovers happen when turning too quickly
- ✓Keep cargo close to the centre of the rig, spread out, and as close to the trailer deck as possible to lower the centre of gravity
- ✓A vehicle with a higher centre of gravity is more likely to roll over
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Towing Doubles Safely
combination Towing two trailers increases chances of jackknife or rollover, with the last trailer most likely to roll. Drive smoothly, allow extra following distance, and remember that a safe speed for a single trailer may be too fast with multiple trailers. Extra offtrack occurs with two trailers.
Key Rules
- ✓Couple the more heavily loaded trailer to the tractor with the lighter trailer behind
- ✓When coupling multiple trailers, ensure spring brakes are applied, or block the trailer if it doesn't have spring brakes
- ✓Never unlock the pintle hook with the dolly still under the rear trailer as the tow bar may fly up causing injury
- ✓The last trailer in a combination is the most likely to roll over
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Trailer Swerving and Whipping
combination Whipping or swerving occurs when the trailer moves quickly and independently of the tractor across the roadway. This is extremely dangerous and must be dealt with immediately by slowing down and stopping to check.
Key Rules
- ✓Whipping and swerving may be caused by driving too fast, sudden steering changes, improper connections, shifting loads, dragging brakes or a flat tire
- ✓If the trailer whips or swerves, slow down and stop as soon as it's safe, then stop and check the vehicle and load even if swerving stops
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Parking a Trailer
combination Block the wheels of a parked trailer so it can't roll. Air pressure in the trailer air tank bleeds down over time depending on system leaks. Trailer brake behaviour depends on whether spring brakes are equipped.
Key Rules
- ✓Block the wheels of a parked trailer so it can't roll
- ✓If a trailer without spring brakes has its air tank drain, the trailer brakes will release; if equipped with spring brakes, the brakes will remain applied
- ✓Brakes must be properly adjusted for the spring brakes to remain applied and effective
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Coupling with a Fifth Wheel - Inspection
combination Coupling must be done with great care. Before coupling, inspect the fifth wheel for damage, lubrication and security, ensure it's tilted downward and coupler jaws are open, and inspect the trailer including kingpin, apron and cargo security.
Key Rules
- ✓Set tractor parking brakes and inspect the fifth wheel for damage, lubrication and security, ensuring it is tilted downward toward the rear and coupler jaws are open
- ✓Block the trailer wheels and if equipped with spring brakes make sure they have applied; check the kingpin isn't bent or broken and the apron is flat
- ✓Ensure air lines and electrical cable are supported and routed so they don't get in the way when backing under the trailer
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Coupling with a Fifth Wheel - Positioning and Connection
combination Position the tractor directly in front of and in line with the trailer, using mirrors to verify alignment. Back up slowly stopping when the fifth wheel just touches the apron, then check height and alignment before connecting fully.
Key Rules
- ✓When aligned, you should see an equal portion of each side of the trailer in each mirror
- ✓Stop when the fifth wheel just touches the trailer apron and don't back up too far or at an angle
- ✓The trailer apron should touch directly above the fifth wheel pivot points; if touching behind or ahead, adjust trailer height with landing gear or air suspension
- ✓Use the lowest reverse gear to back up very slowly and stop when the kingpin locks into the fifth wheel jaws
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Coupling - Connection Checks and Securing
combination After connecting, verify the fifth wheel jaws engaged the kingpin with no space or daylight between fifth wheel and apron, and the release handle is locked. Connect air lines and electrical cable, check trailer lights, and go under to visually confirm the locking jaws are securely closed.
Key Rules
- ✓Confirm no space or daylight between the fifth wheel and trailer apron and the release handle is in the locked position
- ✓Use a flashlight to check the locking jaws are securely closed around the kingpin, and remove keys from the ignition before going underneath
- ✓Check trailer electrical connection by verifying tail lights, brake lights, licence plate light and clearance lights
- ✓A trip inspection report is required for every new trailer you pick up each day
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Coupling - Tug Test and Pulling Away
combination After securing, raise the landing gear slightly, release tractor brakes and gently tug against the trailer parking brakes to confirm the connection holds. Check turning clearance, then fully raise landing gear before pulling away. Test the trailer hand valve at slow speed.
Key Rules
- ✓Perform a tug test by gently pulling against the trailer parking brakes to confirm the kingpin is securely held by the fifth wheel jaws
- ✓Check clearance between rear of tractor and trailer landing gear, and between rear of cab and front of trailer
- ✓Raise landing gear completely and ensure the crank handle is locked in gear before pulling away, then check trailer service brakes with the hand valve at slow speed
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Uncoupling a Tractor and Trailer
combination To uncouple, line up the tractor and trailer, ease pressure on the fifth wheel locking jaws by backing gently, block trailer wheels, lower landing gear until supports touch ground, disconnect lines, pull the release handle, and move the tractor slowly clear.
Key Rules
- ✓Ensure the tractor and trailer are lined up (not at an angle) and the ground is level and firm to support the trailer
- ✓Both landing gear supports must touch the ground to support a trailer
- ✓Keep clear of the tractor wheels during uncoupling as they may roll slightly when the fifth wheel jaws open
- ✓For trailers with air suspension, drain the suspension air supply before leaving the trailer parked
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Pintle Hitch and Other Coupling Devices
combination A pintle hitch uses a hook on the front vehicle and an eye on the rear. When using any coupling device other than a fifth wheel, chains or cables are required. A converter dolly with an axle, fifth wheel and hitch is used when towing more than one trailer.
Key Rules
- ✓When using any coupling device other than a fifth wheel, you must use chains or metal cables equal to the strength of the coupling device
- ✓The drawbar or connection between the motor vehicle and trailer may not exceed five metres unless towing a pole trailer
- ✓Use the safety catch to secure the pintle hitch connection along with safety chains and/or cables
- ✓Coupling devices must be strong enough to hold loaded vehicles together and fastened to a structurally adequate part of each vehicle's frame
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Trailer swerving and whipping
combination Whipping or swerving occurs when the trailer moves independently of the tractor back and forth across the roadway; it is extremely dangerous.
Key Rules
- ✓Whipping/swerving may be caused by driving too fast, sudden steering changes, improper connections, shifting loads, dragging brakes or a flat tire
- ✓If the trailer whips or swerves, slow down and stop as soon as it's safe, then stop and check your vehicle and load even if swerving stopped
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Parking a trailer safely
combination Trailer air pressure bleeds down over time when parked, affecting brakes depending on whether spring brakes are fitted.
Key Rules
- ✓Block the wheels of a parked trailer so it can't roll
- ✓If a trailer without spring brakes drains its air tank, the trailer brakes will release; if equipped with spring brakes they remain applied
- ✓Brakes must be properly adjusted for spring brakes to remain applied and effective
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Pintle hitch and other connections
combination A pintle hitch uses a hook on the front vehicle and an eye on the rear vehicle; converter dollies are used when towing multiple trailers.
Key Rules
- ✓With any coupling device other than a fifth wheel you must also use chains or metal cables equal to the strength of the coupling device
- ✓The drawbar or connection between motor vehicle and trailer may not exceed five metres unless towing a pole trailer
- ✓Use the safety catch to secure the pintle hitch connection along with safety chains/cables
- ✓Coupling devices must be strong enough to hold loaded vehicles and fastened to a structurally adequate part of each frame