CURTMFG.COM
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PRODUCT SUPPORT: 877.287.8634
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17601-INS-RB
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09/23/2021
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ECN8903
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PAGE 2
ASSEMBLY & INSTALLATION
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Parts List
Item Qty Description
1 1 Hitch head
2 2 Spring bar
3 2 Spring bar support bracket
4 1 Adjustable shank
5 1 Snap-up handle
6 1 Hitch pin & clip
7 1 Hitch ball, 2-5/16"
8 1 Lock washer, 1-1/4"
9 1 Hex nut, 1-1/4"-12
10 2 Hex bolt, 3/4"-10 X 5"
11 4 Serrated conical washer 3/4"
12 2 Nylock nut, 3/4"-10
13 2 Hex bolt, 5/8"-11 X 1-3/4"
14 2 Square head bolt,
5/8"-11 X 1-3/4"
Measure the tow vehicle
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
Determine the 'target' uncoupled
ball height for the tow vehicle
Tow vehicle's uncoupled ball height will be
set higher than the coupler height measured
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
Measure trailer coupler height
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
Top of coupler
to pavement
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