User's Manual

68 Revision 2 GM550 v1043 FCC-IC.doc

The GS050 Anti-Two-Block Switch

What Is Needed

• An adjustable wrench

• Four (4) new high quality “C” cell batteries: 3.6 V lithium, or alkaline

• RTV non-corrosive silicone

Tip: Four 3.6 volt lithium “C” cell batteries will provide over four years of battery life, while four

alkaline “C” cell batteries will provide about one year of battery life.

Important! Replace all four batteries of the anti-two-block switch at the same time.

Unchanged batteries will reverse polarity severely reducing battery life.

Important! Protect the interior of the anti-two-block switch from dirt and humidity at

all times.

Step 1. Remove the anti-two-block from the crane and clean off dust and grime.

Important! Do not unscrew the white nylon hex bolt of the antenna.

Important! Do not unscrew the small screw to the left of the antenna.

Step 2. Place the anti-two-block on the edge of flat surface. Use the adjustable wrench to

unscrew the large white nylon hex bolt of the wire rope about one half-inch.

Step 3. Carefully remove the plunger assembly without separating it from the cover, and place

it on a clean and dry surface.

Step 4. Slide out the four batteries.

Step 5. Insert the four new batteries following the positive – negative schema printed on the

back of the sensor.

Step 6. Replace the plunger assembly. Correctly align the bottom cover before screwing in the

white nylon hex bolt of the wire rope. Tighten well.

Step 7. Pull and release the wire rope, the light emitting diode (LED) on the bottom of the

sensor should flash red.

Step 8. Reinstall the anti-two-block switch.

Step 9. Test the anti-two-block system for alarm and lockout before use.

Actual battery life will vary greatly depending on the application, the frequency of use, the age and

quality of the batteries etc.

Figures: Changing batteries of a GS050 anti-two-block switch