Genie 24701R Chain Dog Limit Actuator Set – 3 Pack for Older Chain Drive Openers

The Genie 24701R Chain Dog Set is a replacement set of three external chain-mounted limit actuators designed for select older Genie chain-drive garage door openers.

The chain dogs attach directly to the opener drive chain and work with the opener's mechanical limit-switch system. As the chain travels during opening and closing, the properly positioned chain dogs activate the corresponding limit mechanism so the opener knows where to stop the garage door.

This listing includes THREE chain dogs.

### Product Features

- Genuine-style Genie replacement chain dog set
- Part number 24701R / 24701R.S
- Sold as a set of 3
- External chain-mounted design
- Used with early Genie chain-drive limit systems
- Helps establish garage door open and closed stopping positions
- Attaches directly to the opener chain
- Designed for select older steel T-rail chain-drive openers
- Replacement for worn, broken, damaged, or missing chain dogs
- No electronic programming required

### Specifications

- Manufacturer / Brand: Genie
- Part Number: 24701R / 24701R.S
- Product Type: Chain Dog / Limit Actuator Set
- Quantity: 3 Pieces
- Mounting: External / Chain Mounted
- Drive Type: Chain Drive
- Function: Mechanical Travel Limit Activation
- Application: Residential Garage Door Openers

### What Is a Chain Dog?

A chain dog is a small mechanical actuator mounted directly to the garage door opener drive chain.

As the opener chain moves:

Motor → Chain → Chain Dog → Limit Switch

the chain dog reaches the predetermined limit-switch position and activates the switch.

This tells the opener that the garage door has reached its intended travel limit.

Proper positioning of the chain dogs is therefore important for correct opening and closing travel.

### What Is It Used For?

The 24701R set is used with older Genie chain-drive openers that use external chain-mounted actuators for their mechanical travel limits.

The chain dogs help control:

- Fully open stopping position
- Fully closed stopping position
- Mechanical travel-limit activation

A damaged or incorrectly positioned chain dog can cause the opener to stop at the wrong location or fail to activate the intended limit switch.

### Common Replacement Reasons

Replacement may be needed if:

- Existing chain dog is broken
- Chain dog is missing
- Chain dog will not remain securely mounted
- Limit actuator hardware is damaged
- Door stops in the wrong location
- Chain travels past the intended limit position
- Existing chain-mounted limit components are worn

Travel problems can also be caused by failed limit switches, chain adjustment, rail problems, or other opener components.

### Compatibility

The 24701R.S is intended for select older Genie chain-drive openers using the compatible external chain-mounted limit system and steel T-rail configuration.

Known older applications include select:

- Genie SP99
- Genie 129
- Genie 229
- Genie 200
- Other compatible Genie chain-drive openers using the 24701R limit-actuator system

Always verify the original part number and opener configuration before ordering.

### Important Compatibility Notice

This part is NOT universal across all Genie chain-drive openers.

Many newer Genie openers use:

- Different mechanical limit systems
- Magnetic limits
- Electronic travel modules
- Encoder-based travel systems

Do not order based only on the fact that the opener is chain driven.

Confirm that the existing opener uses the external chain-mounted 24701R-style limit actuators.

### Set of Three

This listing includes:

3 – Genie 24701R Chain Dogs

SSC specifies this product as a three-piece set.

Do not confuse this listing with an individual limit switch or a complete chain assembly.

### Package Contents

Includes:

- 3 – Genie 24701R Chain Dog Limit Actuators

Drive chain, rail, limit switches, opener, trolley, and other hardware are not included unless specifically stated.

### Important Installation Note

Disconnect electrical power to the garage door opener before servicing the chain or travel-limit system.

Chain dogs must be positioned correctly to establish the proper garage door travel limits.

After installation:

- Verify chain-dog attachment
- Confirm open-limit position
- Confirm closed-limit position
- Test the opener through several complete cycles
- Confirm the door does not over-travel
- Test the safety reversing system

Do not operate the opener if the garage door is binding, improperly balanced, or if the travel limits cannot be set correctly.