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.
5
.
5. The lever bar and operating handle must be in
proper alignment. See
Fig. 6. Compare the lever
bar and operating handle alignment to a new, or
a properly operating lever bar and operating
handle. Replace any bent or misaligned lever bar
or operating rod.
6. Check all cotter pins for cracking or damage. Re-
place any cotter pin that shows any signs of
damage.
7. Level the fifth wheel plate to a horizontal posi-
tion. Measure the height from a stationary
mounting point (see
Fig. 7, Ref. 3), such as the
frame rail to the top of the fifth wheel plate (Ref.
1). Pry up on the fifth wheel plate (Ref. 4) below
the pin boss, and measure the vertical move-
ment (Ref. 5). The bracket connection provides a
9/32-inch (7-mm) vertical clearance to provide
cushioning and to avoid downward pin-loading
while retaining minimum plate lift. If the plate lift
(Ref. A) exceeds 5/16 inch (8 mm) as a result of
wear or rubber deterioration, install new, stan-
dard or oversized bracket-shoe rubber pads; see
Group 31 of the Century Class Trucks Workshop
Manual for replacement instructions.
NOTE: Do not measure plate lift immediately
after a trailer has been uncoupled from the fifth
wheel. The rubber may have taken a temporary
04/11/2011
f310887
A
B
A. The nut and washer should be snug against the fifth
wheel.
B. The locks should be completely closed around the
kingpin.
Fig. 4, Holland Fifth Wheel Properly Closed
f310353b
1
2
3
4
10/26/2010
1. Lubricant Grooves
2. Safety Latch
3. Lock Control Handle
4. Mount
Fig. 5, Simplex Series Fifth Wheel
04/11/2011
f310470
1
2
1. Operating Handle 2. Lever Bar
Fig. 6, Lever Bar and Operating Handle Alignment
Frame and Frame Components31
Century Class Trucks Maintenance Manual, January 201631/4
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