7.3
Pry up on the fifth wheel plate below the
pin boss, and measure the vertical move-
ment.
NOTE: The bracket connection provides a
9/32-inch (7-mm) vertical clearance to pro-
vide cushioning and to avoid downward pin-
loading while retaining minimum plate lift.
7.4
If the plate lift exceeds 5/16 inch (8 mm)
as a result of wear or rubber deteriora-
tion, install new, standard or oversized
bracket-shoe rubber pads; see the
Sim-
plex Fifth Wheel Operating and Mainte-
nance Manual
for replacement instruc-
tions.
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.
8.
Check the clearance between the kingpin and
the jaw of the fifth wheel. If the clearance is
greater than 1/8 inch (3 mm), dial out the slack
using the eccentric jaw pin. For detailed instruc-
tions, see the
Simplex Fifth Wheel Operating and
Maintenance Manual
.
9.
Check all mounting bolts for signs of fatigue, and
tighten them to the proper torque. For torque
specifications, see
. Inspect all angles,
plates, and brackets for cracks or other damage.
10. 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.
11. After inspecting the fifth wheel, lubricate all mov-
ing parts with a chassis or multipurpose grease.
See
for lubrica-
tion instructions.
Holland
1.
Thoroughly steam clean all fifth wheel compo-
nents before inspection.
2.
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. Replace bent, worn, or damaged
parts with genuine Holland parts.
3.
Using a Holland Kingpin Lock Tester, part num-
ber TF-TLN-1000 or TF-TLN-5000, check the
operation of the locking mechanism by opening
and closing the locks. See
31–03 Fifth Wheel Lubricating
Fontaine
1.
Tilt the top plate forward (the front of the fifth
wheel is down) and apply grease to each bearing
area through the zerk fittings located on each
side of the top plate just to the front of the
bracket pins. Continue to apply grease until it is
coming out of the back of the bearing. It may be
necessary to raise the rear of the fifth wheel with
a pry bar to open up the pocket slightly and
allow the grease to flow through. A substantial
amount of grease may be required initially to fill
the reservoir.
Tilt the fifth wheel rearward (the rear of the fifth
wheel is down) and repeat the greasing proce-
dure. Rock the top plate back and forth several
times to spread the grease over the bearing sur-
face.
2.
Inspect the trailer kingpin plate and top surface
of the fifth wheel to make sure each is properly
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
Frame and Frame Components
31
Business Class M2 Maintenance Manual, March 2016
31/3
Property of American Airlines
