freightliner M2 Plus Maintenance Manual page 69

Frame and Frame Components
7.2 Measure the height from a stationary
mounting point, such as the frame rail to
the top of the fifth wheel plate.
7.3 Pry up on the fifth wheel plate below the
pin boss, and measure the vertical
movement.
NOTE: 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.
7.4 If the plate lift exceeds 5/16 inch (8 mm)
as a result of wear or rubber
deterioration, install new, standard or
oversized bracket-shoe rubber pads; see
the Simplex Fifth Wheel Operating and
Maintenance 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
uncoupled 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
instructions, 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 Group 00 in the Business
Class M2 Plus Workshop Manual. 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
moving parts with a chassis or multipurpose
grease. See Group 31
instructions.
Holland
1. Thoroughly steam clean all fifth wheel
components before inspection.
Business Class M2 Plus Maintenance Manual, 02/10/2023
for lubrication
2. Check the fastener torques on the fifth wheel
assembly and fifth wheel mounting. Tighten bolts
and nuts as needed. Replace missing or
damaged bolts. Replace bent, worn, or damaged
parts with genuine Holland parts.
3. Using a Holland Kingpin Lock Tester, part
number TF-TLN-1000 or TF-TLN-5000, check the
operation of the locking mechanism by opening
and closing the locks. See
A
04/11/2011
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
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
31
Fig. 4.
B
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31/3