The Spring Frog Tester is designed for the testing and inspection of the wing rail return spring used in spring frog turnouts. The instrument is comprised of two sides.

The one side (Spring Tester) is used for testing the spring tension of the spring box assembly to ensure sufficient pressure is being exerted by the spring on the wing rail.

• The spring tester side is placed on the plunger with the forks between the rail and the plunger.
• The tester must be aligned parallel with the centerline of the spring box to ensure that there is no side loading when used. Use the leveling screw to align.
• Zero the pressure gauge reading before testing.
• Pump the pump to build the pressure and keep an eye on the spring plunger.

As soon as the spring plunger starts to move STOP and take the pressure gauge reading. Use the chart to read off the corresponding load. This is the spring load. The common normal force for the spring is ± 600 lbf (268 psi.) The load tolerance is between 582 lbf (260 psi) and 762 lbf (340 psi). Adjust spring tension as needed. Check with the supplier of the spring rail frog for the correct settings for the frog being tested. Also refer to the track standards for correct spring tensions and loads. Loads might be different than the common load quoted above for different frogs and applications.

The opposite side (Spreader Side) is used to spread open the wing rail to inspect for wear. The spreader is used in the throat area of the frog. Place the spreader jaws into the throat of the switch. Ensure that the 2 stabilizer bars are lying flat on top of the rails. Zero the pressure gauge before spreading. Pump the pump to build pressure and spread the wing rail open. Do not exceed 1,500 psi. on the spreader jaws.