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Freightliner Century Class. Manual - part 15

12/02/2010

f311134

NOTE: 6000 Series shown; 7000 Series fifth wheels use similar parts.

Wedge Stop Rod Nut

Flat Washer, 5/8"

Wedge Stop Rod Spring

Wedge Stop Rod

Grease Fitting

Bracket Pin

Bracket Retainer Pin

Cotter Pin, 3/16" x 1"

Bumper Spring

10. Handle Spring

11. Bolt, Secondary Safety Lock
12. Flat Washer
13. Secondary Safety Lock
14. Bushing, Secondary Safety

Lock

15. Hex Locknut
16. Pull Handle
17. Bolt, Bumper
18. Bushing

19. Bumper
20. Timer Spring
21. Timer
22. Operating Handle
23. Bolt, Operating Handle
24. Bushing, Operating Handle
25. Hair Pin Cotter
26. Wedge
27. Step Jaw

Fig. 1, Fontaine Fifth Wheel

Frame and Frame Components

31/2

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).

When the wheel is locked, the safety latch must
swing free and fall freely into position. See

Fig.

The lever bar and release handle must be in
proper alignment. See

Fig. 3

. Compare the lever

bar and release handle alignment to a new, or a
properly operating lever bar and release handle.
Replace any bent or misaligned lever bar or re-
lease handle.

Check all cotter pins for cracking or damage. Re-
place any cotter pin that shows any signs of
damage.

Check all mounting bolts for signs of fatigue, and
tighten them to the proper torque. For torque
specifications, see

Group 00

. Inspect all angles,

plates, and brackets for cracks or other damage.

Replace cracked, worn, or damaged parts with
new parts. Replace all loose mounting bolts with
5/8–11 SAE grade 8 bolts, grade C locknuts, and
hardened washers. Do not re-use bolts, nuts,
and washers on fifth wheel mountings.

After inspecting the fifth wheel, lubricate all mov-
ing parts with a chassis or multipurpose grease.
See

MOP 31–02

for lubrication instructions.

Holland FW35

Thoroughly steam clean all fifth wheel compo-
nents before inspection.

Check for cracks in the fifth wheel assembly,
mounting brackets, and mounting parts.

Check the fastener torques on the fifth wheel
assembly and fifth wheel mounting. Tighten bolts
and nuts as needed. Replace missing or dam-
aged bolts.

Inspect the fifth wheel for bent, worn, damaged,
and missing parts; replace them as needed with
genuine Holland parts.

Using a Holland Kingpin Lock Tester (Holland
tool number TF-TLN-5001, available through the
PDCs as HLD TFTLN5001), check the operation
of the locking mechanism by opening and closing
the locks. See

Fig. 4

After inspecting the fifth wheel, lubricate all mov-
ing parts with a chassis or multipurpose grease.
See

MOP 31–02

for lubrication instructions.

Castloc II and Simplex Series

Disconnect the tractor from the trailer. For in-
structions, see the vehicle driver’s manual.

Thoroughly steam clean the fifth wheel.

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).

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10/29/2007

Lubricant Grooves

Safety Latch

Release Handle

Mount

Fig. 2, Holland FWS1 Fifth Wheel

03/28/2013

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Release Handle

Lever Bar

Fig. 3, Lever Bar and Release Handle Alignment

Frame and Frame Components

31/3

When the wheel is locked, the safety latch must
swing free and fall freely into position. See

Fig.

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.

Check all cotter pins for cracking or damage. Re-
place any cotter pin that shows any signs of
damage.

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
set, which will normally recover after being un-
coupled for a short period of time.

Check all mounting bolts for signs of fatigue, and
tighten them to the proper torque. For torque
specifications, see

Group 00

. Inspect all angles,

plates, and brackets for cracks or other damage.

04/11/2011

f310887

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

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10/26/2010

Lubricant Grooves

Safety Latch

Lock Control Handle

Mount

Fig. 5, Simplex Series Fifth Wheel

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Operating Handle

Lever Bar

Fig. 6, Lever Bar and Operating Handle Alignment

Frame and Frame Components

31/4

10. After inspecting the fifth wheel, lubricate all mov-

ing parts with a chassis or multipurpose grease.
See

Maintenance Operation 31–02

for lubrica-

tion instructions.

Jost

Disconnect the tractor from the trailer. For in-
structions, see the Century Class Driver’s
Manual.

Thoroughly steam clean the fifth wheel.

Check the mounting for missing or damaged fas-
teners, and broken components. Replace or re-
pair as needed.

Inspect the bracket pin bolts. Make sure the lock-
ing tabs are properly securing the bolts in place.
See

Fig. 8

Check the fifth wheel for bent, worn, or broken
parts. Replace as needed.

If the fifth wheel is equipped with low-lube plates,
check the plates and replace if damaged or worn
down to the securing bolts. It is normal for out-

side edges of the plate to pucker slightly; this
does not affect performance.

Check the fifth wheel adjustment. Using a lock
tester, lock and unlock the fifth wheel several
times. Make sure that the locking mechanism
works properly.

The lock is properly adjusted if: the wheel locks
and unlocks easily each time and the lock tester
rotates freely.

The lock is too loose if: you feel fore-aft play
when pulling and pushing on the lock tester
handle. See

Fig. 9

, Ref. A.

The lock is too tight if: the lock tester does not
rotate freely in the lock. See

Fig. 9

, Ref. B.

If the lock is improperly adjusted, correct as fol-
lows.

If the lock is too tight, loosen the jam nut, turn
the adjustment bolt clockwise one full turn, then
reset the jam nut. Lock and unlock the mecha-
nism several times to test. Repeat if necessary.
See

Fig. 10

If the lock is too loose, loosen the jam nut, turn
the adjustment bolt counterclockwise one full
turn, then reset the jam nut. Lock and unlock the
mechanism several times to test. Repeat if nec-
essary. See

Fig. 10

If the fifth wheel is equipped with a sliding
mechanism, inspect and adjust it as follows.

9.1

Check the bracket for any cracks or miss-
ing and damaged parts.

9.2

Inspect the locking plungers for full en-
gagement.

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04/11/2011

A. Extended Top Plate Lift Height
1.

Fifth Wheel Top Plate

Fifth Wheel Frame Mount

Frame Rail

Lifting Point

Static Top Plate Height

Fig. 7, Measuring Fifth Wheel Top Plate Lift

09/01/2009

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Fig. 8, Bracket Pin Bolt Locking Tabs

Frame and Frame Components

31/5

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