Northstar Trailers SPORTSTAR III User Manual
NORTHSTAR TRAILERS
Assembly Guide for SPORTSTAR III Trailer
Congratulations! You are the proud owner of a NORTHSTAR trailer. Please follow
the instructions and steps in this manual for proper assembly. You can also watch
our clip on YouTube to help you through the assembly process.
Part
No.
Part Description
Qty.
1
Frame (deck)
1
2
Tongue (with wiring harness)
and Coupler (hitch)
1
3
Side-Rail
2
4
Front Corner Bracket
2 5 Ramp
2 6 Wheel and Hub Assembly
2 7 Leaf-Spring
2
8
Axle
1
9
Fender
2
10
Tongue Side Brace
2
11
Rear Gate
1
12
Rear Corner Bracket
2
Part
No.
Description
Qty.
A
U-Bolt
4
B
Spring Plate
2 C Large Locknut
3 D 3 ½” threaded Pin-Bolt
5 E 3 5/8” threaded Pin-Bolt
2
F
Side-Rail/Gate-Pin
10
G
Ramp Pin-Bolt
2 H Large Nut
7 I Large Lock-Washer
2 J Small Lock-Washer
2
K
Small Flat-Washer
22
L
Small Bolts 1”
4 M Cotter-Pin
15
N
Spare Tire Lug Nut
2 O Taillight/Brake Light
2
P
Running Light
2
Q
Taillight/Brake Light L-Bracket
2 R License Plate Bracket
1 S Retaining Cable with Cotter-Pin
2
T
Small Brass Screw (included in
bag with blue wire connectors)
4
U
Wire Connectors
8 V Small Locknut
30
W
3 ¾” Bolt
8
X
3” Bolt
12
TRAILER PARTS LIST HARDWARE
Make sure that all parts, as listed above, are included in your shipment. If any parts
are missing please contact NORTHSTAR at 1-855-375-3088.
Other tools needed for assembly: grease gun, flathead screwdriver, socket set,
wrench set, small zip-ties, small rubber mallet.
IMAGES OF PARTS AND HARDWARE
**On some trailers the spare tire mount is found on the top of the tongue.**
INVERTED ASSEMBLY
[
This trailer requires inverted assembly. (Assembled upside-down). Start by turning
the trailer frame upside-down so the trailer deck is facing the ground. Use a table
robust enough to support the weight of the trailer frame and high enough to elevate
the frame to waist-height, or place the corners of the frame on buckets, or use
sawhorses to elevate each end.
CAUTION: This trailer is heavy. More than one person is required to flip the trailer
frame and assembly this trailer. Personal injury may occur if you try to assemble this
trailer alone.
STEP 1: LEAF SPRING & AXLE ASSEMBLY
a. Flip the trailer frame (1) upside-down, and place the frame on a waist-high
table or other elevated supports in order to facilitate assembly.
b. Position the leaf-spring (7) on the frame’s spring casing (welded to the
frame) so the eye in the leaf-spring is positioned toward the front of the
trailer and aligns with the bolt eyehole in the spring casing.
c. Fasten the leaf-spring to the casing with 3 ½” pin-bolt (D) and a large nut (H)
by inserting the bolt through the leaf-spring and through the eyeholes in the
casing. (Leave tension loose to allow play when aligning the axel; you will
securely tighten bolts in step “i”.)
d. Secure the hooked end of the leaf-spring to the casing by running a 3 ½” pin-
bolt (D) through the eyeholes of the leaf-spring casing and over the flat side
of the leaf-spring. Fasten the bolt with a large nut (H).
e. Lay the axel (8) on top of the leaf-springs, and align the holes in the axel
knobs with the posts on the leaf-springs. The axle will lie snug on top of the
springs.
FASTEN AXLE TO LEAF SPRINGS
f. Take two U-bolts (A) and slide them over the axle, so the bolts hang over the
axle and on both sides of the leaf-springs. Attach the spring-plate (B) to the
U-bolts using the small locknuts (V), and then tighten the locknuts to fingertightness.
g. Once all of the locknuts are on the U-bolts, tighten the locknuts in alternating
sequence in order to ensure an even, level plate pressure.
h. Continue to tighten the locknuts until the spring-plate just begins to bend
and conform to the shape of the leaf-spring. (Approximately 35 ft-lbs of
torque).
i. Securely tighten the bolts from step “c” and “d”. After tightening the bolts,
insert a cotter-pin (M), then secure the cotter-pin by bending at least one leg
to 90 degrees.
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