5.1 Close the fifth wheel on a standard 2-inch
(50-mm) kingpin or similar 2-inch (50-mm)
diameter shaft so that it locks.
5.2 Push on the wedge stop rod with hand
pressure. It should move in 1/4 inch (6
mm) and spring back out on release.
If the free travel is not 1/4 inch (6 mm),
adjust the distance to 1/4 inch (6 mm) by
turning the wedge stop rod, on the right
side of the top plate, clockwise to reduce
the gap and counterclockwise to increase
it.
ConMet Simplex®
1. Disconnect the tractor from the trailer. For
instructions, see Chapter 10 of the Business
Class M2 Plus Driver’s Manual.
2. Thoroughly steam-clean the fifth wheel.
3. Check the fifth wheel plate for cracks. Check for
sharp edges on top; the chamfer should be 1/8
to 1/4 inch (3 to 6 mm).
4. When the wheel is locked, the safety latch must
swing free and fall freely into position. See
Fig. 1.
5. The lever bar and operating handle must be in
proper alignment. See
Fig. 2. Replace any bent
or misaligned lever bar or operating rod.
6. Check all clinch pins for cracking or damage.
Replace any clinch pin that shows signs of
damage.
7. Measure the top plate lift. See
Fig. 3.
7.1 Level the fifth wheel plate to a horizontal
position.
f310353b
1
2
3
4
10/26/2010
1. Lubricant Grooves
2. Safety Latch
3. Lock Control Handle
4. Mount
Fig. 1, Simplex Series Fifth Wheel
04/11/2011
f310470
1
2
1. Operating Handle 2. Lever Bar
Fig. 2, Lever Bar and Operating Handle Alignment
f310475
04/11/2011
1
2
3
A
4
5
A. Extended Top Plate Lift Height
1. Fifth Wheel Top Plate
2. Fifth Wheel Frame Mount
3. Frame Rail
4. Lifting Point
5. Static Top Plate Height
Fig. 3, Measuring Fifth Wheel Top Plate Lift
Frame and Frame Components31
Business Class M2 Plus Maintenance Manual, 02/10/202331/2
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