Spring 843450

Removed sander backing plate held by four screws. Removed tape over bearing. Inserted screwdriver in hole to keep sander shaft from rotating while I used an allen wrench to remove offset base plate screw and special washer. Bearing retaining circlip can be removed with special pliers that have two pins that can be pulled together or spread apart made for retaining clips such as these. I modified a pair of end nippers to do the same job. Bearing is in the base plate that was held in by the special screw and washer that secured it to the rotating shaft and can be knocked out or pushed out with a press or a hammer and something that spans the width of the bearing. New bearing gets pressed in with same tools and retaining clip reinserted with special pliers. A specially shaped block of wood was used to seat the bearing at the bottom of its hole in the base plate. Clear shipping tape was replaced over screw and washer. To replace the broken sand paper clamping spring, I drove the steel rod out of the clamping device which is held onto the base plate by a hole in a raised part of the base plate in the center of it on the edge. Once the rod is removed the clamp falls off and the pieces of broken spring can be removed. Install the new spring the same way the other side's spring is mounted with the rod in place but slightly off center to one side. The base plate should be held in a vice while all this is going on. I made two metal rods with a 1/16" hole in the end of each so I could insert the springs' straight ends into each rod, then the rod is bent down toward the opposite side of the base plate and held down while the hole of one side of the clamping lever is slid over the rod that extends slightly out to one side. The hole in the clamping lever on the opposite side will have to be forced into position by tapping the rod inward thru the entire mechanism while you do whatever is necessary to get the hole at the other end of the clamp to line up with the rod that is being tapped across to meet it. This is the most difficult step and may require someone to help push the clamping piece inward toward the rod, as the spring is trying to force the rod to bend away from it. Without the vice and the two brass rods with holes in the end, this is almost an impossible task. Now that I've done it about a dozen times, it takes no more than about 15 minutes. My terms base plate and backing plate are for the cast aluminum base that secures the backing plate for the sand paper and has the spring rod and clamps attached to it. The four screws remove the sand paper backing plate and also go through the base plate but the base plate is still held on by the special washer and screw attached to the rotating shaft. The cast aluminum base holds the bearing and the sand paper clamps and springs, so it has to be removed to fix either problem. Good luck. Geoff S.

Removed the pad from the sander. lined up the spring, clamp, and retaining rod. Put the roll pins on the ends of the spring with the hold-down clamp half in place. Bent the spring into position then clamp the piece of wood over them, and carefully secured them. Tapped the rod into place, removed the clamp. I suggest safety glasses and leather gloves for this project as the spring has quite a bit of Torx to it. FYI 1 of the roll pins shot of the spring and have yet to find it. Be careful when installing these items.

Removing broken spring was easy. Replacing broken spring was difficult due to alignment problems with new spring tension during reassembly. Used clamps to realign rod with holes then completed. It was learn as you go using whatever tool I had to solve the problem. In the end, determination and success! Sander back to normal.

Had to use vise to hold spring and cross rod in position so rod could be put back in place.

Installed the spring and a new rod

1. Removed the sanding pad.
2. Removed the metal base.
3. Installed the retaining spring on the rod that secures the sandpaper retaining clamp.
4. Used three clamps to hold the retaining clamp and rod in position.
5. Tapped rod through retaining clamp.
6. Reassembled metal base and sanding pad.
7. Tested sander under workshop conditions.