Draw-Tite 7903 TRUNNION BAR WT.-DIST. User Manual
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For vehicles with air springs, air shocks or automatic leveling system, check vehicle owners manual. Unless otherwise
specified, level the vehicle with the vehicle loaded as it will be when towing before setting ball height and attaching
trailer.
PRELIMINARY BALLMOUNT ADJUSTMENT
1.
Install hardware in lower hole of ballmount as shown. Tighten nut enough to prevent easy rotation of ballmount.
2.
Determine spring bar height "Y" using table below. Insert spring bar and trunnion into the ball mount. Swing bar
outward to the same angle as when connected to trailer. Lift up on bar to remove slack. Tilt ball mount for proper "Y”
dimension at end of spring bar.
SPRING BAR HEIGHT (Y)
( )
15" TO 18"
18" TO 20"
20" TO 22"
22" TO 24"
24" TO 26"
COUPLER HEIGHT
X
COUPLER STYLE
A B C
7" 4-1/2" 5-1/2"
8" 5-1/2" 6-1/2"
9" 6-1/2" 7-1/2"
10" 7-1/2" 8-1/2"
11' 8-1/2" 9-1/2"
Y
* ADD 1” TO Y DIMENSION FOR NON INTEGRATED CAM SPRING BARS
3.
The ballmount (G) is adjustable through a 15° angle range for proper spring bar adjustment. See chart above.
HIGH-PERFORMANCE BALLMOUNT ADJUSTMENT
* ADD 1” TO Y DIMENSION FOR NON-INTEGRATED CAM SPRING BARS.
EQUAL NUMBER OF
TEETH MUST SHOW
15°
TEETH MUST
BE PARALLEL
Install longer 3/4” bolt (J) with two serrated washers (E) as shown. Install lockwasher (L) and nut (K), but allow space
for washers to be positioned and aligned. Align the washers as shown, hold in position, and tighten nut. Torque the
two nuts (K) to 300 ft/lbs. If proper torque wrench is not available, torque nuts to 150 ft/lbs then turn nuts an additional
1/4 turn. Do not lubricate the threads.
66006IN-13JAN06H
PCN7968
©2006 TOWING PRODUCTS, INC
Litho in USA
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CAUTION: Washer MUST BE aligned parallel with teeth on ballmount. Re-check washer alignment after nut is
tightened. Equal number of teeth must show at top and bottom. Teeth can be stripped when loaded if not properly
aligned.