About this video

Pump pressure slowly dropping? Before you tear into a full rebuild, there's a quick adjustment most guys don't know about, and it can buy you months (or longer) of strong performance with parts you probably already have in the box. 👇 🔩 WHAT SHIMS ACTUALLY DO Shims sit between the impeller and the insert. They control the CLEARANCE between those two parts and that clearance is what generates pressure and suction. As the impeller and insert wear over time, the gap between them opens up. More gap = less performance. Adding shims closes that gap back up. ⚡ THE FIX (5 MINUTES, NO NEW PARTS) A few months down the road, when you notice: • Pressure reading a little off • Slight drop in flow • Pump working harder for the same output …you can skip the rebuild entirely. Just: 1. Pull the volute 2. Drop in a couple of shims 3. Close that tolerance back up 4. Re-assemble and test That's it. Pressure restored, no parts ordered. 💡 PRO TIP — DON'T THROW LEFTOVER SHIMS AWAY When you rebuild with a new impeller and new insert, you won't need all the shims that came in the kit (we usually pull the thickest one and leave the thin ones in). KEEP the leftovers in your toolbox. They're exactly what you need to fine-tune performance months from now. ⚠️ WHEN SHIMMING WON'T BE ENOUGH Shims close small gaps, not big ones. If your impeller or insert is severely worn, no amount of shimming will recover full performance — that's when it's time for a full rebuild with the DHS Equipment Pump Overhaul Kit. The right move: shim it now while you can, rebuild when shimming stops doing the job. 🛒 Pump Overhaul Kits (with shims, impellers, inserts, and hardware) at DHS Equipment. Wacker Neuson, Multiquip, Honda & more.