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A cone shaped cable drum changes the lever arm during cable extension which results in minimal or no pulling force. The load can be adjusted to float with no increasing or decreasing forces. Kromer “ZeroGravity" Tool Balancers have wide cold rolled springs made from thin strips of steel, where all other balancers use narrow thick strips of steel that are heat treated. This heat treating process results in hydrogen embrittlement and notch sensitive steel with 1/5 of the life of a Kromer cold rolled spring.

Basic Cable

Available with the anchoring ferrule compressed on the free end. The cable ferrule for the free end should be ordered for installation. Refer to model’s parts’ list for various lengths.

Cable Assembly

Includes the basic cable, rubber buffer or ball, cable clamp, socket, wedge, trigger snap and ferrule.

Cable Clamp


A critical part of the cable assembly that positions the rubber buffer or ball on the cable. It must be tightened securely to prevent excessive cable drum rotation. It should be positioned to provide specified cable travel, which will maximize spring life and optimize Zero Gravity performance. The cable clamp and buffer must be at the nozzle before any service or repair is safe.

Cable Drum Assembly

Precision injected aluminum with 20% more strength and 50% of the weight of cast steel. The drum for the 7241 series and larger, must use factory supplied anti-rotational 5mm cable only to prevent premature failure. Replacement includes bearings and cable limiter.

Cable Ferrule


This oblong metal clip slides over the free end of the cable and must be firmly secured. It is an integral safety feature of the cable socket and wedge to prevent the free end of the cable from slipping through the socket when uploading occurs. It also prevents the free end of the cable from fraying resulting in loose strands of wire projecting and causing an injury.

Cable Limiter

Safety feature on models 7241 and larger. It is a spring-loaded detent that engages through the bottom of the housing wall next to the nozzle to prevent the cable from bottoming out where the load would pull against the ferrule. When quick changing the cable on line, the cable limiter must be depressed with a screwdriver to position the cable anchor where it is accessible from the window on the side of the housing.

Cable Socket

The free end of the cable can be lengthened or shortened at the time of installation, using the socket and wedge to position the load. It is critical that the wedge is installed inside the socket or the load will fall. The trigger snap prevents the wedge from falling out. A SAFETY REQUIREMENT Dictates THAT A CABLE FERRULE BE INSTALLED, ONLY ON THE FREE END OF THE CABLE AT LEAST 1 INCH ABOVE THE SOCKET.

Drum Locking Pin


Recessed into the back of the housing on models 7230 and 7241, and on the bottom of the 7251 series. It is recessed and spring loaded to prevent accidental contact or damage. Its function is to prevent the drum from rotating during on line quick cable changes, and any other emergency. It is engaged by depressing the screw pin and rotating 1/4 turn clockwise. To unlocked rotate back and insure it springs back flush with the outer edge of the housing.

Hanging Suspension

7221 - Includes a Locking Safety Hanger, a floating and rotating suspension, and a suspension dowel with a cotter pin. It should be installed with the Locking Screw Cap up.

7228 - Includes 3 Locking Safety Hanger and pin. The older version includes a safety latching hook with shank, washer, nut and cotter pin. It is a complete assembly only.

7230 - Includes safety latching hook, hanger, pin, washers, cotter pins, bearing, washer and nut (spot welded). It is a complete assembly only. Optional Crosby Bullard Hook available.

7241 - Includes Safety latching hook, cast holder, load leveling pin, hanger pin, and cotter pins. It also comes with an optional Crosby Bullard Golden Gate Hook with core exchange of a cast holder. It comes as a complete unit only.

7251 - Same as above.

Load Range Table

Used as a reference to determine the number of rotations of the shaft needed to load the spring to the high side of its capacity. Mark the rear cover disc’s position in relation to the housing. A full rotation of the cover disc is equal to one full rotation of the shaft. Always load the unit to its maximum capacity. Rotation of the worm clockwise loads the spring and rotation counter clockwise unloads the tension.

Locking Trigger Snap

This type of trigger snap must be unscrewed completely before the latch will open. After installing the load the lock should be screwed down tight.



The plastic insert that fits into the cable cone where the cable extends through the housing as the cable unrolls off the cable drum. It is a cable and cable drum wear indicator and is intended to provide early warning of hanging suspension misalignment on models 7241 and larger. Regular monitoring will prevent cable wear in the drum cavity, and cable drum groove damage.


Tension increases as the cable is extended because the outer diameter of the cable drum is constant. Therefore, the pulling force increases resulting in unnecessary stresses on the worker. Repetitive and cumulative stress disorders will increases using this type of device on production tools. It is better suited for robots, hoses and cables.

Rubber Buffer or Ball

A hard rubber ball or buffer located above the cable clamp to cushion the impact of tool retraction. The force is determined by the disparity of the tool weight in relation to the spring tension.

Safety Chain


Required safety device that must be installed following local safety requirements to stop the balancer from falling in the event of suspension failure. It should be installed so that it does not impede the rotation and floatation of the hanging suspension, and to insure the maximum distance the balancer could fall is 4 inches.

Safety Detent

This is a spring loaded brake that is pushed against the outer wall of the cable drum by spring tension against its inner lip. When spring tension is released; intentionally during adjustment or when a spring breaks, the detent is released into the ribs of the housing blocking drum rotation. In the case of a broken spring, the activated safety detent prevents the load from falling.

Spring Latch Trigger Snap

This type of trigger snap is used on light weight tools and should be greased during routine maintenance.


Used on Models 7230 and larger for stepless load adjustment. Use a 17 or 19-mm deep socket on a speed wrench or drill. An impact tool should not be used nor high speed when rotating the worm. The worm interacts with the worm gear to turn the shaft which applies or reduces tension to the spring.

Worm Gear

Interacts with the worm to rotate the shaft. The shaft slides through the worm gear and is then held in place with keys inserted into the key ways. It is held on the shaft with an inverted snap ring, and protected from impact by a cover disc.