the shoe on my saw is stuck and won't slide forward or back, i've tried loosening the knob

Diagnosis

The adjustable shoe on the Makita XRJ05Z is held in place by a tensioning screw mechanism controlled by the adjustment knob. When the shoe becomes immobile despite the knob being loosened, the root cause is almost always mechanical interference within the guide rails. Over time, fine particulates—specifically a mixture of sawdust, metal filings, and moisture—compact into the sliding channels, creating a "cement" effect that welds the shoe to the tool body. In more severe cases, if you have been cutting plastics or PVC, friction-induced heat can melt small amounts of polymer into the tracks, creating a physical bond that the knob's clamping mechanism cannot overcome. You can confirm this by attempting to wiggle the shoe; if there is zero lateral play even with the knob fully unscrewed, you are dealing with a physical obstruction rather than a failure of the tightening mechanism itself.

How to Fix It

To free the shoe without damaging the aluminum guide rails or stripping the adjustment threads, follow this sequence:

1. Unscrew the adjustment knob completely. Do not just loosen it; remove the knob entirely from the housing to ensure there is no residual tension on the internal clamping plate.
2. Invert the tool so the shoe is facing upward. Use a high-pressure blast of compressed air (minimum 90 PSI) directed specifically into the gaps between the shoe and the tool body to blow out loose debris.
3. Apply a penetrating lubricant, such as WD-40 Specialist Penetrant or PB Blaster, directly into the slide tracks. Let it soak for 10 to 15 minutes to break down the compacted grime.
4. Insert a thin, flat-head screwdriver or a stiff putty knife into the gap between the shoe and the main chassis. Gently tap the tool with a rubber mallet on the side of the shoe, alternating directions (forward and backward) to break the surface tension of the debris.
5. Once the shoe begins to budge, slide it fully forward and backward several times to clear the channels.
6. Wipe the rails clean with a lint-free cloth soaked in mineral spirits to remove the lubricant and remaining residue before reinstalling the adjustment knob.

If That Didn't Work

• Check for Bent Rails: Inspect the guide rails for any dents or bends caused by dropping the tool. If the rail is deformed, the shoe will be physically pinched. Use a small needle-nose plier to gently straighten any burrs in the metal track.
• Internal Screw Seizure: If the knob spins but the internal clamping screw is seized, the screw may have rusted or stripped. You will need to disassemble the shoe assembly by removing the mounting bolts to inspect the threaded rod. Replace the screw if the threads are flattened.
• Chemical Solvent Bath: For melted plastic, use a small amount of acetone on a cotton swab to dissolve the polymer. Be extremely careful not to let the acetone touch the plastic housing of the saw, as it will melt the tool's casing.
• Mechanical Forced Displacement: If the shoe is still stuck, place the tool in a bench vise, securing the body (not the shoe). Use a dead-blow hammer to deliver a sharp, singular strike to the end of the shoe to force it backward.

Heads Up

• Avoid over-tightening the adjustment knob once the shoe is free; over-torquing can strip the plastic threads inside the tool body, rendering the shoe permanently unstable.
• Periodically apply a dry silicone spray to the rails. Avoid using heavy grease, as grease attracts sawdust and will cause the shoe to jam again much faster.
• Always ensure the shoe is pressed firmly against the workpiece during cuts. Allowing the shoe to "bounce" or hang off the material increases vibration and forces debris deeper into the slide channels.
• Inspect the shoe for wear; if the edges are rounded or pitted, it may not seat correctly, leading to increased friction and more frequent jamming.