Genuine Multipoint Gearbox - With Pre-Fitted Ball Bearing, Spring, and Screw - Lift Lever

Product Information

Fuhr multipoint door lock gearboxes are designed for durability and security, featuring a robust deadbolt that throws 20mm, except for the 25mm and 30mm backset locks, which throw 14mm. The gearbox dimensions are 220mm in length and a width of 18mm. Both the latch and deadbolt stand at 31mm high, with a 61mm gap between the bottom of the latch and the top of the deadbolt. Installation is straightforward, as gearboxes are secured to faceplates with three screws. The top screw is positioned 91mm from the middle screw, while the distance from the middle to the bottom screw is 108mm.

Fuhr locks are equipped with a pre-fitted ball bearing and spring, enhancing the locking mechanism's feel when operated. This feature ensures a more positive locking experience. It's important to note that some replacement gearboxes available in the market may lack this essential spring and ball bearing. However, all of Duffells' replacement Fuhr gearboxes come with these components pre-fitted, allowing for a seamless swap.

When replacing an existing Fuhr multipoint lock or gearbox, be aware that the latch height may vary. Older models featured a latch height of 28mm, while newer versions have a height of 33mm. If the latch from the old lock is intact, it can be removed by loosening the Allen key bolt in the old gearbox, allowing for reinstallation in the new lock.

Additionally, take note of the 30mm gearboxes commonly used in bifold doors, particularly Smarts Aluminium doors, as these do not interchange with the standard 856 gearbox.

We offer a comprehensive range of associated products for Fuhr 856 - Lift Lever gearboxes, including multipoint door locks, keeps, spindles, handles, and various accessories.

Operation: Lift Lever

Latch Reversal: To reverse the latch, simply undo the screw located on the side of the lock case adjacent to the latch. Remove the latch, reverse its position, reinsert it, and replace the screw.

To measure the backset, follow these steps:

1. Identify the Door Edge: Start by locating the edge of the door where the lock will be installed.

2. Measure from the Edge: Use a tape measure to determine the distance from the edge of the door to the center of the lock cylinder or the latch. This distance is your backset measurement.

3. Check Standard Sizes: Common backset sizes include 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, and 60mm. Ensure your measurement aligns with these standards.

To measure the centres (PZ measurement):

1. Locate the Cylinder: Identify the position of the cylinder on the door.

2. Measure from the Centre of the Cylinder: Measure the distance from the center of the cylinder to the center of the latch or deadbolt. This distance is your PZ measurement.

3. Standard Measurement: The standard PZ measurement is typically 92mm.

Understanding the operation of the Lift Lever:

• Lift Lever Mechanism: The Lift Lever operation involves lifting the handle to engage the locking mechanism. This action simultaneously retracts the latch and deadbolt, allowing the door to open.

• Ease of Use: This type of operation is designed for convenience, providing a smooth and efficient way to secure and unlock your door.

By following these guidelines, you can ensure accurate measurements and a clear understanding of the lock's operation.