DMV PA - CDL Doubles and Triples Endorsement Text Book Questions (And Answers)

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Tibrious
ID:
2283
Filename:
DMV PA - CDL Doubles and Triples Endorsement Text Book Questions (And Answers)
Updated:
2009-12-12 16:24:31
Tags:
Pennsylvania Department of Motor Vehicles; DMV; Commercial Drivers License; CDL; Doubles and Triples; Double; Doubles; Triple; Triples; Trailer; Trailers; Doubles and Triples Endorsement Test; Endorsement; Textbook
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Test Questions (and answers,) for the Doubles and Triples Endorsement portion of the Commercial Drivers License Exam of Pennsylvania, but taken directly from the Commercial Drivers Manual.
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  1. 1. What is a converter dolly?
    • A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semitrailer
    • can be coupled to the rear of a tractor-trailer combination forming a double bottom rig.

    (Page 7-2)
  2. 2. Do converter dollies have spring brakes?
    Yes, as explained below:

    POSITION CONVERTER DOLLY IN FRONT OF SECOND (REAR) TRAILER

    • • Release dolly brakes by opening the air tank petcock. (Or, if the dolly has spring brakes, use
    • the dolly parking brake control.)

    (Page 7-2)
  3. 3. What three methods can you use to secure a second trailer before coupling?
    • COUPLING TWIN TRAILERS
    • SECURE SECOND (REAR) TRAILER

    • • If the second trailer doesn't have spring brakes, drive the tractor close to the trailer, connect the
    • emergency line, charge the trailer air tank, and disconnect the emergency line. This will set the
    • trailer emergency brakes (if the slack adjusters are correctly adjusted). Chock the wheels if you
    • have any doubt about the brakes.

    • COUPLE TRACTOR AND FIRST SEMI-TRAILER AS DESCRIBED EARLIER
    • ***Caution:For the safest handling on the road, the more heavily loaded semi-trailer should
    • be in first position behind the tractor. The lighter trailer should be in the rear.***
    • A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semitrailer
    • can be coupled to the rear of a tractor-trailer combination forming a double bottom rig.

    • 1.) POSITION CONVERTER DOLLY IN FRONT OF SECOND (REAR) TRAILER
    • • Release dolly brakes by opening the air tank petcock. (Or, if the dolly has spring brakes, use
    • the dolly parking brake control.)

    • If the distance is not too great, wheel dolly into position by hand so it is in line with the kingpin.

    • Or, use the tractor and first semi-trailer to pick up the converter dolly:

    - Position combination as close as possible to converter dolly.

    - Move dolly to rear of first semi-trailer and couple it to the trailer.

    - Lock pintle hook.

    - Secure dolly support in raised position.

    - Pull dolly into position as close as possible to nose of the second semi-trailer.

    - Lower dolly support.

    - Unhook dolly from first trailer.

    - Wheel dolly into position in front of second trailer in line with the kingpin.

    2.) CONNECT CONVERTER DOLLY TO FRONT TRAILER

    • Back first semi-trailer into position in front of dolly tongue.

    • Hook dolly to front trailer.

    - Lock pintle hook.

    - Secure converter gear support in raised position.

    3.) CONNECT CONVERTER DOLLY TO REAR TRAILER

    • Make sure trailer brakes are locked and/or wheels chocked.

    • • Make sure trailer height is correct. (It must be slightly lower than the center of the fifth wheel, so
    • trailer is raised slightly when dolly is pushed under.)

    • Back converter dolly under rear trailer.

    • Raise landing gear slightly off ground to prevent damage if trailer moves.

    • Test coupling by pulling against pin of number two semi-trailer.

    • • Make visual check of coupling. (No space between upper and lower fifth wheel. Locking jaws
    • closed on kingpin.)

    • Connect safety chains, air hoses, and light cords.

    • • Close converter dolly air tank petcock and shut-off valves at rear of second trailer (service and
    • emergency shut-offs).

    • Open shut-off valves at rear of first trailer (and on dolly if so equipped).

    • Raise landing gear completely.

    • • Charge trailers (push "air supply" knob in) and check for air at rear of second trailer by opening
    • the emergency line shut-off. If air pressure isn't there, something is wrong and the brakes won't
    • work.

    (Page 7-2/7-3)
  4. 4. What do you check when making a visual check of coupling?
    • COUPLING SYSTEM AREAS
    • • Check fifth wheel (lower):
    • - Securely mounted to frame.

    - No missing, damaged parts.

    - Enough grease.

    - No visible space between upper and lower fifth wheel.

    - Locking jaws around the shank, not the head of kingpin.

    - Release arm properly seated and safety latch/lock engaged.

    • Fifth wheel (upper):

    - Glide plate securely mounted to trailer frame.

    - Kingpin not damaged.

    • Air and electric lines to trailer:

    - Electrical cord firmly plugged in and secured.

    • - Air lines properly connected to glad hands, no air leaks, properly secured with enough slack
    • for turns.

    - All lines free from damage.

    • Sliding fifth wheel:

    - Slide not damaged or parts missing.

    - Properly greased.

    - All locking pins present and locked in place.

    - If air powered–no air leaks.

    • - Check that fifth wheel is not so far forward that tractor frame will hit landing gear, or cab hit
    • the trailer, during turns.

    (Page 7-4/7-5)
  5. 5. Why should you pull a dolly out from under a trailer before you disconnect it
    from the trailer in front?
    • UNCOUPLING TWIN TRAILERS
    • UNCOUPLE REAR TRAILER

    • Park rig in a straight line on firm level ground.

    • Apply parking brakes so rig won't move.

    • Chock wheels of second trailer if it doesn't have spring brakes.

    • Lower landing gear of second semi-trailer enough to remove some weight from dolly.

    • Close air shut-offs at rear of first semi-trailer (and on dolly if so equipped).

    • Disconnect all dolly air and electric lines and secure them.

    • Release dolly brakes.

    • Release converter dolly fifth wheel latch.

    • Slowly pull tractor, first semi-trailer and dolly forward to pull dolly out from under rear semitrailer.

    UNCOUPLE CONVERTER DOLLY

    • Lower dolly landing gear.

    • Disconnect safety chains.

    • Apply converter gear spring brakes or chock wheels.

    • Release pintle hook on first semi-trailer.

    • Slowly pull clear of dolly.

    • ***Caution:Never unlock the pintle hook with the dolly still under the rear trailer. The
    • dolly tow bar may fly up, possibly causing injury and making it very difficult to
    • re-couple.***
    • (Page 7-3)
  6. 6. A. What should you check for when inspecting the converter dolly?

    B. The pintle hook?
    A. Converter dolly air tank drain valve: CLOSED.

    B. Make sure pintle hook is latched.


    • DOUBLE AND TRIPLE TRAILERS
    • • Shut-off valves (at rear of trailers, in service and emergency lines):

    - Rear of front trailers: OPEN.

    - Rear of last trailer: CLOSED.

    - Converter dolly air tank drain valve: CLOSED.

    • Be sure air lines are supported and glad hands are properly connected.

    • If spare tire is carried on converter gear (dolly), make sure it's secured.

    • Be sure pintle-eye of dolly is in place in pintle hook of trailer(s).

    • • Make sure pintle hook is latched.
    • • Safety chains should be secured to trailer(s).

    • Be sure light cords are firmly in sockets on trailers.

    (Page 7-5)
  7. 7. A. Should the shut-off valves on the rear of the last trailer be open or closed?

    B. On the first trailer in a set of doubles?

    C. On the middle trailer in a set of triples?
    A. Closed

    B. Open

    C. Closed

    Read below for full explanation:

    • DOUBLE AND TRIPLE TRAILERS
    • • Shut-off valves (at rear of trailers, in service and emergency lines):

    - Rear of front trailers:OPEN.

    - Rear of last trailer:CLOSED.

    • - Converter dolly air tank drain valve:CLOSED.
    • • Be sure air lines are supported and glad hands are properly connected.

    • If spare tire is carried on converter gear (dolly), make sure it's secured.

    • Be sure pintle-eye of dolly is in place in pintle hook of trailer(s).

    • Make sure pintle hook is latched.

    • Safety chains should be secured to trailer(s).

    • Be sure light cords are firmly in sockets on trailers.

    Do these checks in addition to Section 5.3, "Inspecting Air Brake Systems."

    (Page 7-5)
  8. 8. How can you test that air flows to all trailers?
    CHECK THAT AIR FLOWS TO ALL TRAILERS (Double and Triple Trailers)

    • Use the tractor parking brake and/or chock the wheels to hold the vehicle. Wait for air pressure to
    • reach normal, then push in the red "trailer air supply" knob. This will supply air to the emergency
    • (supply) lines. Use the trailer handbrake to provide air to the service line. Go to the rear of the rig.
    • Open the emergency line shut-off valve at the rear of the last trailer. You should hear air escaping,
    • showing the entire system is charged. Close the emergency line valve. Open the service line valve
    • to check that service pressure goes through all the trailers (this test assumes that the trailer
    • handbrake or the service brake pedal is on), then close the valve. If you do NOT hear air escaping
    • from both lines, check that the shut-off valves on the trailer(s) and dolly(s) are in the OPEN position.
    • You MUST have air all the way to the back for all the brakes to work.
    • TEST TRACTOR PROTECTION VALVE
    • Charge the trailer air brake system. (That is, build up normal air pressure and push the "air supply"
    • knob in.) Shut the engine off.
    • Step on and off the brake pedal several times to reduce the air pressure in the tanks. The trailer air
    • supply control (also called the tractor protection valve control) should pop out (or go from "normal"
    • to "emergency" position) when the air pressure falls into the pressure range specified by the
    • manufacturer. (Usually within the range of 20 to 45 psi.)
    • If the tractor protection valve doesn't work right, an air hose or trailer brake leak could drain all the
    • air from the tractor. This would cause the emergency brakes to come on, with possible loss of
    • control.

    • TEST TRAILER EMERGENCY BRAKES
    • Charge the trailer air brake system and check that the trailer rolls freely. Then, stop and pull out the
    • trailer air supply control (also called tractor protection valve control or trailer emergency valve) or
    • place it in the "emergency" position. Pull gently on the trailer with the tractor to check that the trailer
    • emergency brakes are on.

    TEST TRAILER SERVICE BRAKES

    • Check for normal air pressure, release the parking brakes, move the vehicle forward slowly, and
    • apply trailer brakes with the hand control (trolley valve), if so equipped. You should feel the brakes
    • come on. This tells you the trailer brakes are connected and working. (The trailer brakes should be
    • tested with the hand valve, but controlled in normal operation with the foot pedal, which applies air
    • to the service brakes at all wheels.)

    (Page 7-5/7-6)

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