Table of Contents
- 1 What is the purpose of a converter dolly?
- 2 When uncoupling the converter dolly Why should you never unhook the pintle hook while it is still under the trailer?
- 3 How can you test air flow to all trailers?
- 4 When uncoupling the rear semi trailer you should lower the converter dolly landing gear?
- 5 How can you test the air flows to all trailers?
- 6 How do you know if your converter dolly is equipped with antilock brakes?
What is the purpose of a converter dolly?
A converter dolly, or simply a dolly, is used to support the front end of a semitrailer when it is used as the second or third trailer of a combination vehicle. The semitrailer has suspension and wheels of it’s own only in the rear.
When uncoupling the converter dolly Why should you never unhook the pintle hook while it is still under the trailer?
D. Remove the dolly as quickly as possible. Never unlock the pintle hook with the dolly still under the rear trailer. This could cause the dolly tow bar to fly up, possibly causing serious injury.
When connecting the converter dolly to the front trailer What do you do first?
- Release dolly brake by opening the air tank petcock or if the dolly has spring brake, use the dolly parking brake control;
- Wheel the dolly into position by hand so it is in line with the kingpin;
- Use the tractor and first semi trailer to pick up the converter dolly and move it into position.
What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
What is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? The dolly tow bar may fly up. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed.
How can you test air flow to all trailers?
Check air flow to all 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.
When uncoupling the rear semi trailer you should lower the converter dolly landing gear?
Uncouple rear trailer: Lower landing gear of second semitrailer enough to remove some weight from dolly. Close air shut-offs at rear of first semitrailer (and on dolly if so equipped). Disconnect all dolly air and electric lines and secure them. Release dolly brakes.
How do you test tractor protection valve?
You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.
At what PSI is the safety valve set to open?
5.1.6 – Safety Valve The safety valve protects the tank and the rest of the system from too much pressure. The valve is usually set to open at 150 psi.
How can you test the air flows to all trailers?
How can you test that air flows to all trailers? Use parking brake and/or chock wheels. Wait for normal air pressure, then push “trailer air supply” knob. You just studied 5 terms!
How do you know if your converter dolly is equipped with antilock brakes?
There is a yellow lamp on the left side of the dolly. Converter dollies built on or after March 1, 1998 are required to have Anti-Lock Braking Systems (ABS). The presence of ABS will be indicated by a yellow lamp on the left side of the dolly.