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Page 6
Model 330 / 330A Hinge Assembly
INSTALLATION
The 330 and 330A Hinge Assemblies are ONLY
to be used and maintained with Premier parts.
Any substitution or use of non-Premier parts
in a 330/330A Hinge Assembly will VOID ALL
PRODUCT WARRANTY.
Installation Procedure:
1. 330 and 330A Hinge Assemblies must be
installed to comply with the Federal Motor
Carrier Safety Regulations. Specifically,
Section 393.70, Paragraph C: “Towing of Full
Trailers.” Prior to install or operation, consult
with local, State and Federal agencies, as there
may be additional applicable laws governing
the installation and use of this product.
2. Prior to welding, Premier strongly suggests
building a jig to properly locate each mating
356 Housing and 350 Bracket. The jig should
ensure the two Hinge Assemblies are of
equal height above the ground, parallel and
equidistant from the trailer centerline. The
outside edge of each housing is to be placed
3/8” from the adjacent inside surface of the
bracket as shown in Figure 1.
3. All welds used to install the 330 and 330A
Hinge Assemblies must follow one of the three
attached Welding Procedure Specifications;
GMAW, SMAW or FCAW. Welding should only
be performed by a certified welder skilled in
structural welding practices.
4. All weld locations must be clean, paint free
and void of any moisture, oil, grease, oxides or
loose or thick scale.
Because 330/330A Hinge Assemblies operate in
pairs, the installation instructions below are
to be simultaneously followed for each hinge
assembly.
356 Housing Installation:
5. The 356 Housings accommodate a front end
structure consisting of 2 ½” round tubing.
The converging angle of each tube into each
housing is 12° (see Figure 2). Note that when
the install is complete, the two housings are to
be equidistant from the trailer centerline and
their bores aligned.
6. Fit-up, between the 2 ½” tube and the mounting
surface of the 356 Housing, must be flush, as
shown in Figure 2. Failure to have a flush fit
prior to welding will cause the capacities to
be negatively affected. Figure 2A shows one
possible example of an improper fit-up that
must be avoided.
7. Attach the 356 Housing to the front end
tube with a minimum 3/8” fillet weld that
encompasses the entire interface between the
housing and tube as shown in Figure 2.
350 Bracket Installation:
8. The two 350 Brackets must be equal in height
above the ground, parallel, equidistant from the
trailer centerline and their bases must be flush
with the mounting structure surface. Misaligned
brackets or a failure to have a flush fit with the
mounting surface prior to welding will cause
poor hinge operation as well as negatively
affect their capacities.
9. Tack weld the 350 Brackets in place and test
fit the 356 Housings. Before proceeding, make
sure the bores of the housings align with the
bores of the brackets and the 3/8” gap exists
between each housing and bracket as shown in
Figure 1.
10. Attach the 350 Bracket to the mounting surface
with a minimum 3/8” fillet weld around the outer
and inner surfaces of the bracket as shown in
Figure 3.
330 / 330A Hinge Assembly after Welding
(330: Premier 344 Rubber Bushings only)
(330A: Premier 344A Poly Bushings only)
11. Allow the finished structures to cool.
12. Place the 359 Flange into the bore on the
vehicle centerline side of the 350 Bracket as
illustrated in Figure 4. Make certain that the slit
in the flange lines up with the slit in the bracket
(shown in Figure 3).
13. Slide the 344/344A Bushing into the 356
Housing making sure that the smaller diameter
end of the tapered bore in the bushing is
towards the 359 Flange. Place the housing into
the 350 Bracket aligning the bores as much as
possible.
14. Slide the 352 Taper pin into the 350 Bracket
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