G & #1 SCALE

USA TRAINS EMD NW-2 DIESEL LOCOMOTIVE

This locomotive can be converted to Kadee®couplers using one of two methods:

Option 1 (#787 packet) is for larger radius track and requires only drilling a hole in the gear box shank.
Option 2 is for smaller radius track and requires some cutting of the USA's pivot arm and the Kadee^® gear box shank and lid. Note: for G scale use #831 & #1 scale use #1831 for Option 2.

Please read thoroughly before proceeding.

For both options on the front and rear: Remove the original couplers. Loosen pivot arm mounting screw, disconnect spring from floor, and then remove the screw and pivot arm.

	Fig. 1 Modified  Fig. 2	For #831(#1831) trim slot in lid 11/32" (.344" wide and 5/32" (.156") deep to match sides of pivot arm        For #836 (#1836) Coupler mounting drill 1/8" (.125) hole centered in the boss clearance hole  For #831 (#1831) trim 7/16" (.438") off of #831 (#1831) gear box shank
OPTION 2: Is for smaller (tight) radius track, even down to 1100, depending on the coupler mounting and length of car coupled to the locomotive. Trim 5/8" (.625") off the end of the original pivot arm (see FIG. 3).  Trim 7/16" (.4375") off the end of the shank of the #831 draft gear box (see FIG. 2). Cut a slot in the lid 11/32" (.344") wide and 5/32" (.156") deep to match the sides of the pivot arm (see FIG. 1). This also exposes the mounting hole.	For #831 (#1831) pivot mounting  trim 5/8" (.625") off of end  Fig. 3	U.S.A. pivot arm
Assemble the #831 coupler. Check fit to the pivot arm matching the mounting holes. Trim and adjust until holes match and fit is even. Reinstall pivot arm to mounting block. Use a graphite lubricant (Kadee® #231) on mounting surfaces for best performance. Leave the original screw a little loose and hook the spring to the floor. Note: the centering action of the pivot arm performs better when the spring's hook is pointing up (see FIG. 4). Attach the coupler to the pivot arm with a #4 x 1/2" screw (see FIG. 4).	#4 x 1/2" screw  Fig. 4 Inverted coupler mounting with  trimmed pivot arm	Hook on spring should point up

Check for correct coupler height, function, and clearance and make any adjustments necessary. If too high, loosen pivot arm screw slightly.