Holland Fifth Wheels
General Information
The 2535 sliding fifth wheel models incorporate a
Model 3500 fifth wheel (
Fig. 10.1
), equipped with
either an air-operated release slide, or a manual re-
lease slide. Sliding fifth wheel assemblies are
mounted on a baseplate which permits forward and
rear movement along notched rails. Plungers are
meshed into teeth on the baseplate to lock the slid-
ing mechanism. Disengagement of the sliding mem-
ber is accomplished when the plungers are with-
drawn (manually or air-operated), releasing the fifth
wheel assembly so that it can be positioned for opti-
mum weight distribution over the tractor axles.
The air-operated release slide assembly (
Fig. 10.2
)
contains a double-ended air cylinder which locks and
unlocks both sides of the sliding member at the
same time. The air cylinder is activated by a two-
position air-control valve in the tractor cab.
The manual release slide assembly (
Fig. 10.3
) is
equipped with a single release lever. Pulling on the
release lever unlocks both plungers.
Type "B" Kingpin Lock Mechanism
(Fig. 10.4)
The Type "B" kingpin lock mechanism utilizes two
spring-loaded lock halves. The final forward motion
of the kingpin into the open lock halves forces the
locks to close in a 360 degree grip around the shoul-
der and neck of the kingpin, positioning sliding yokes
between the lock halves and tapered rib members of
the fifth wheel understructure. The kingpin can be
released only by manually operating the kingpin lock
1
2
3
01/19/95
f310046a
1.
Kingpin Lock Mechanism
2.
Kingpin Control Handle
3.
Mounting Bracket
Fig. 10.1, Holland Fifth Wheel
1
2
3
f310369
05/19/93
NOTE: Baseplate rails not shown.
1.
Kingpin Lock Control Handle
2.
Double-Ended Air Cylinder
3.
Slide Plunger Release
Fig. 10.2, Air-Operated Release Slide Assembly
1
2
3
02/01/96
f310438
4
NOTE: Baseplate rails not shown.
1.
Kingpin Lock Control Handle
2.
Plunger Release Handle
3.
Plunger Release Spring
4.
Plunger
Fig. 10.3, Manual Release Slide
Fifth Wheels and Trailer Couplings
10.1
