Installation Guide

Item# Qty Description
1 1 Hitch head
2 1 Adjustable shank bar
3 2 Spring trunnion bar
4 2 Snap-up bracket
5 1 Pipe handle
6 2 Lift chain, 8mm x 400mm
7 1 Bolt, 5/8" - 11 x 1 1/2" long
8 2 Hex bolt, 3/4" - 10 x 5" long
9 4 Conical washer, 3/4"
10 2 Nylock nut, 3/4" - 10
11 1 Hitch pin, 5/8" x 3" long
12 1 Clip
13 2 U-bolt, 3/8" - 16, 3/4" thread length
14 4 Nylock nut, 3/8" - 16
15 2 Bolt, 1/2" - 13 x 2"
16 2 Bolt, 1/2" - 13 x 4"
17 2 Clip for snap-up bracket
18 1 Adjustment rod, short
19 1 Adjustment rod, long
20 2 Flat washer, 1/2"
Top of coupler
to pavement
Trailer
coupler
height
Figure 2
Figure 3
Figure 4
Upright
position
Inverted
position
Closest position to
height determined
in Step 3
Measure trailer coupler height
Measure the tow vehicle
Determine the 'target' uncoupled
ball height for the tow vehicle
Install shank, hitch head and ball
Line up the tow vehicle and trailer on level pavement, in
a straight position. Use the trailer tongue jack to level the
trailer. Measure the distance from pavement to the top
of the coupler socket and record here
For vehicles with air springs, air shocks or automatic
leveling systems only, check the vehicle's owners manual
or other instructions on these items. Unless otherwise
indicated, air springs and air shocks should be deflated
to their minimum recommended pressure before
assembling and adjusting the weight distributing hitch.
Pick reference points on the front and rear bumper of the
towing vehicle. Measure and record height to pavement.
Front bumper to pavement
Rear bumper to pavement
Step 2
Select 1 1/4" threaded-shank hitch ball to match trailer
coupler and load capacity equal to or exceeding the gross
trailer weight. Attach the ball to the head assembly (#1) using a
lock washer and nut. NOTE: If a 1" threaded shank hitch ball
is desired, a CURT reducer bushing #21101 must be used.
(ordered separately)
Step 3
Position head assembly on shank. Slide head up or
down to the nearest bolt hole alignment position which
corresponds with the target ball height determined
earlier. Mark the position on the shank. See Figure 4.
Tow vehicle's uncoupled ball height will be set higher
than the coupler height measured in Step 2 to allow
for vehicle squat when coupled to trailer.
For passenger cars, add 1/8" for each 100 lbs. of tongue
weight. Record ball height
Step 1
Insert adjustable shank bar (#2) into receiver tube on tow
vehicle and secure with hitch pin & clip (#11, #12). NOTE: To
obtain proper ball height on high ground clearance vehicles,
shank may be inverted as shown in Figure 3. If shank is used
in the inverted position, check for adequate ground clearance.
PARTS LIST
ASSEMBLY
1
3
2
10
11
19
13
12
9
9
16
7
14
15
17
5
4
6
8
Figure 1
20
18
CURTMFG.COM • NEED ASSISTANCE? • 1.877.287.8634 • PAGE 2