Replacing a GU / Ferco Multipoint Lock in a Pella Door
Older Pella doors were manufactured with GU/Ferco shootbolt multipoint locks (part #499033299 and #499033199). Pella no longer manufactures doors with these particular mechanisms, but we can help you replace your lock if it breaks.
If your lock is not a GU/Ferco lock, this article will not help you. To identify whether or not your lock is a GU/Ferco, look at the lock faceplate for the GU or G-U/Ferco logo (shown in picture below). It should be about 7 inches up from the spring latch.
If this is your lock, it can easily be replaced with a new GU replacement lock, part #4990330--this is a Cremona-style GU/Ferco lock. Even if your door is not a Pella door, this article will help you replace or install a Cremona lock.
Pella original GU/Ferco lock is a three-point lock with a shootbolt at top, a shootbolt at bottom and a deadbolt and latch at handle. Replacement lock also has these three locking points, same handle-height (35") and same backset (50mm).
It is important to understand the few differences between the original and new locks:
One Piece vs. Two-Piece lock (diagram below):
New lock comes in two pieces: 1) main gear, 2) top shootbolt tip
Most original locks were one-piece locks, although there were some two-piece locks as well.
Loosen the set screw on the interior handle with a hex wrench.
Use a flathead screwdriver on interior side to unscrew faceplate.
Remove faceplates; spindle and cylinder tailpiece willl pull out with faceplates.
Lock runs entire length of vertical edge of door. Remove all screws and remove multipoint lock from door edge.
Determine how much lock needs to be trimmed to make lock fit in door panel with shootbolt tip*:
Lay old lock next to replacement lock, lining up bottoms so handles are both at same height. Make sure both locks are disengaged (shootbolt tips and deadbolts retracted)
If old lock is a two-piece, make a mark on replacement lock to match where heights of locks match up (without shootbolt tips attached).
If old lock is a one-piece, lay shootbolt tip so top lines up with original lock top. Mark on new lock where the difference must be trimmed down so lock fits in door with shootbolt tip attached.
Option 1 if old lock is not available: Install bottom gear and secure with 1 or 2 screws. Place shootbolt tip at top of door and mark where alligator teeth will fit into shootbolt tip. Remove lock from door and trim excess.
Option 2 if old lock is not available: Determine the amount to be trimmed by subtracting the overall length of assembled lock, 81", from the height of your door.
If door panel is 77-1/4" with shootbolt tip 6-3/4", the cut-off would be 3-3/4". So: 81" lock - 77-1/4" height of door = 3-3/4" amount to be trimmed, i.e. 81 - 77-1/4 = 3-3/4 cut off.
*Note: See picture below. When trimming, cut can be about 1/8" short; alligator teeth must fit in conncetor, but connecting plate will cover up a small gap. All three placements shown in the picture are acceptable lengths of lock.
Once the measurements have been determined, mark this length to be trimmed with a sharpie on the lock itself.
Clamp lock to table and carefully trim with hacksaw. NOTE: This step requires caution and knowledge of safety procedures. Watch figures and keep children away. Extension will be hot during and after cutting.
Use a file, sandpaper or a sander to smooth cut edge of trimmed extension piece.
Slip newly trimmed lock body into mortise in door edge.
Attach top shootbolt tip by fitting alligator teeth of backplate into connector on shootbolt tip.
Use fingertips or a screwdriver to slide connector plate over gap between main gear and shootbolt.
Screw lock in place in two or three places. Stick handle with spindle into lock and check operation with door open. Deadbolt and shootbolt should engage when handle is lifted; turning thumbturn should lock deadbolt, shootbolts and handle in place.
If lock functions properly, unlock lock and install and tighten all screws running up and down length of faceplate.
Close door almost completely, watching how deadbolt and spring latch line up with strike plate. Try lifting handle; lock and strike plate are most likely slightly off. Use pencil to mark on strike plate location of deadbolt and spring latch.
Open door and remove strike plate.
Using a rasp or file, carefully remove excess material from bottom of each hole in strike plate, about 1/8".
Reinstall strike plate and test operation.
Reinstall faceplates and handles, making sure to tighten set screw.
*NOTE: If door is greater than 81", attach middle extension (part #40325) to main gear and trim middle extension in the same manner as described above before attaching shootbolt tip.
Click below to download your own printable guide from All About Doors & Windows to help you replace the GU / Ferco lock in your Pella door.