J

J1587 Timeouts
Number of times the J1587 data link to ProDriver was disrupted. ( Detroit )

JACK

1) Mechanical lifting device to raise chassis for repairs or tire changes. 2) (slang) Locomotive.

JACK KNIFE

(1) To place the trailer at a sharp angle to the tractor; (2) a type of skid in which either the tractor or trailer loses traction and slides sideways

JACK SHAFT

An intermediate driving shaft.

JACKING

Turning a tractor while backing so as to cause the trailer to assume a "Jackknife" position. Combines with "chasing" to allow the trailer to be steered along the prescribed path. See chasing.

JACKING IT AROUND

Backing a semi-trailer around a very sharp curve.

JAKE BRAKE

(Slang) The Jacob engine brake. Used as an auxiliary braking device on a tractor. Builds up back pressure in the engine by preventing the exhaust from escaping so that the engine slows.

JAM BUSTER

Assistant yardmaster.

JANNY

To couple.

JEEP WHEEL

See Joe dog.

JINGLE LINE

Weld line weld gun area, after body framing.

JOB NO. 1

The date on which volume production is initiated at the affected Assembly Plants.

JOE DOG

Device with a dead axle that converts a single axle tractor to a tandem axle tractor. It hooks over the tractor's fifth wheel, replacing it with another for the semi to be hooked onto.

JOHNSON BAR

Type of pry bar used to maneuver heavy cargo.

JOINED THE BIRDS

(slang) To jump from a moving train when collision is imminent.

JOINT

A length of rail, usually thirty-three feet. To "ride to a joint" is to bring cars together so that they are coupled.

JOUNCE

Jounce is the upward travel of the vehicle wheel against the spring and shock absorber, measured from the normal static position.

JOUNCE CLEARANCE

Clearance between wheel and wheel house.

JUGGLER

Brakeman who must load and unload less than carload lots at way stations.

JUMPED THE PIN

Missing the fifth wheel pin on the trailer when coupling tractor to trailer.

JUNCTION

The general area where two or more highways join or cross, within which are included the roadway and roadside facilities for traffic movement in the area. A junction may include several intersections of roadways.

References

Detroit Diesel

Caterpillar User's Manual