1
What height are most 5th wheels intended to be?
47-inch. 1203
What is the size of Allen wrench needed to adjust an A-type locking mechanism?
½ inch 1212
What is the maximum height that trailers can be in North America?
13 feet 6 inches 1203
How many turns out do you do after tightening the adjuster all the way?
1.5 turns out 1212
What does a relay do?
Uses a small amount of electricity to control a larger amount of electricity.
What are the two most popular mounts in 5th wheel mounting?
Single-angle outboard mount, Double-angle inboard-outboard mount 1216
What is the interval after the initial?
30,000 miles 1210
What is one of the better known locking mechanisms?
Holland A-type locking mechanism. 1203
What is the first interval for maintenance on many 5th wheels?
1000-1500 miles 1210
What is the difference between fuses and circuit breakers?
Fuses are a one time use, circuit breakers can be reset.
How must a sliding 5th wheel be before they are used to haul a trailer?
Locked into a set position. 1200
How many steps are there in sliding procedures of the 5th wheel?
6. 1218-1219
What are The two SAE standard king pin sizes in North America?
2 inch and 3.5 inch 1220
What are the types of 5th wheels used in North America?
SAF Holland, Fontaine, JOST. 1199
What is the main purpose of the final drive?
To increase torque and decrease speed. 460
With an ELI what three status conditions can it tell you?
Ready to couple, proper couple improper couple. 1210
What are most 5th wheels made of?
Cast steel plate, forged steel plate, pressed steel plate, forged aluminum alloy plate. 1200
What is the third kingpin size in offshore applications?
3 inch 1220
What can happen if you do not have the trailer properly supported when you go to uncouple?
The load may move uncontrollably and cause serious injury or damage to the person or equipment.
During a tandem drive oil change what is used to remove the sludge build up?
Diesel fuel 470
What are the three types of primary 5th wheel locks?
Trigger-activated (no slack) Fontaine style, kingpin-activated (euro-style) JOST style, double-jaw: jaws spread by king pin to release, kingpin and spring locked. 1199
What is step three of the sliding procedures of the 5th wheel?
Visual check that both plungers have disengaged from the rail teeth. Release the tractor brakes and drive the tractor forward or backwards slowly to position the 5th wheel. 1218
What are the advantages claimed for JOST 5th wheels?
Integral secondary and third lock, anti-high hitch lugs, easy pull handle, kingpin cushion, lock assembly rebuildable on tractor in less than 30 min. 1208
What are some of the problems if it is hard to uncouple?
Trailer weight is loaded onto the lock, trailer air suspension has been deflated, improper fifth wheel jaw lock adjustment, Damaged upper coupler bolster plate. 1216
About how many rpms need to drop when shifting?
750 RPM 489