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You're rebuilding a hydraulic cylinder and the gland nut won't break loose. You've tried the pin wrench — the pins keep slipping out. You've tried the 2-jaw wrench — it cams off under torque and strips the wrench holes. You've tried a pipe wrench — it scarred the gland nut and now it's starting to oval. You need a tool that actually works. This is that tool.
The 3-jaw full-contact wrench clamps around the entire circumference of the gland nut, applying equal pressure from three points simultaneously. It doesn't slip. It doesn't strip pin holes. It doesn't deform the nut. You put it on, attach your 3/4" breaker bar, and the gland nut breaks loose — even after years of being seized by corrosion, thread lock, and hydraulic pressure.
There are four common ways to remove a hydraulic cylinder gland nut. Three of them damage the nut. One doesn't:
Unlike the cheap "V-shape" 2-jaw wrenches, this tool is a full-circle clamp design. The three adjustable jaws encircle the gland nut completely, creating uniform clamping pressure around the entire diameter. This equal 3-point contact means:
The 105mm–145mm capacity covers the boom, arm, and bucket cylinder gland nuts on the most popular 20-ton class excavators and similar-sized equipment:
This wrench is adjustable and works on any gland nut between 105mm and 145mm in diameter, regardless of brand. Measure the outside diameter of your gland nut before ordering.
3-jaw gland nut wrenches come in three standard size ranges. Measure the outside diameter of your cylinder gland nut to determine which one you need:
If you only own one gland nut wrench, this is the size to get. The 105mm–145mm range covers the cylinders on the machines most commonly found in the field.
Will this work with a 1/2" drive breaker bar?
This wrench has a 3/4" square drive. If you only have a 1/2" breaker bar, use a 1/2" to 3/4" adapter. However, for seized gland nuts on 20-ton machines, we strongly recommend using a proper 3/4" breaker bar — you'll need the extra length and strength to break the nut loose.
Can I use this with an impact wrench?
Yes — a 3/4" or 1" pneumatic or electric impact wrench works well, especially on heavily seized gland nuts. The 3-jaw design holds the nut securely even under impact forces.
What if my gland nut is already damaged / ovaled from a pipe wrench?
The 3-jaw wrench can often still grip a lightly damaged gland nut because it contacts the full circumference — it finds purchase even on slightly deformed surfaces. For severely damaged nuts, you may need to file or grind the high spots first to allow the jaws to seat evenly.
Is this just for excavators?
No. This wrench works on any hydraulic cylinder gland nut between 105mm and 145mm in diameter — excavators, loaders, cranes, boom trucks, telescopic handlers, agricultural equipment, industrial presses, and any other machine with hydraulic cylinders in this size range.
Professional 3-jaw full-contact hydraulic cylinder gland nut wrench. Adjustable 105mm to 145mm (4" to 5.75"). 3/4" square drive for breaker bar. Full-circle clamp applies equal pressure — no slipping, no stripping, no deforming. Fits 20-ton class machines: Cat 320, Komatsu PC200, Deere 200D, Hitachi ZX200, Kobelco SK210, and more.