Your Kinshofer grab has lost its bite. It grips weakly, turns slowly, or sheds metal from the shells. Every idle hour costs you money on a live site. Here is the good news. Most faults need a Kinshofer grab repair, not a costly replacement. The damage almost always traces back to a few known wear points. This guide covers the common faults, how each is fixed, and when to repair, rebuild or replace. It draws on hands-on overhauls of grabs run hard by demolition, recycling and hazardous-waste operators.
Common Kinshofer Grab Problems and Their Wear Points
Most Kinshofer grab faults come from five or six wear points. Knowing them helps you describe the problem and get a faster fix.
- Hydraulic cylinders. Worn seals and scored rods cause leaks and weak closing force.
- Rotation unit and slew ring. Worn bearings or drive faults stop smooth turning.
- Internal hoses. Hoses routed inside the hub chafe, kink or collapse.
- Pressure relief valve. A failing valve starves the grab of force.
- Shells. Cracked, distorted or worn shell plate weakens the grip.
- Cutting edges. Replaceable 500 HB steel edges wear down and stop holding material.
Each fault shows up as a clear symptom. Read on to match your symptom to its likely cause.
Why Your Kinshofer Grab Has Lost Its Closing Force
Closing force fails when the cylinders cannot build or hold pressure. The common causes are worn seals, a scored piston rod, internal bypass, or a relief valve set too low. A good workshop pressure-tests the circuit first. It then strips the cylinder to find the real fault before quoting.
The fix depends on what the strip-down shows. We reseal the cylinder, hone the bore, or re-chrome the rod where needed. A badly damaged cylinder gets a full rebuild. We also reset or replace a faulty relief valve, then re-test under load.
We handle this work in-house. See our grab and grab cylinder repair service for the cylinder side of the job. For wider faults, our hydraulic cylinder repair and rebuild page explains more.
Why Won’t My Kinshofer Grab Rotate?
Rotation faults come from the integrated rotation unit. On Kinshofer selector grabs the slew ring, drive and hoses sit inside one hub, as Kinshofer notes. So a rotation problem can be mechanical or hydraulic.
Common symptoms include:
- No rotation at all
- Rotation in one direction only
- Jerky or slow turning
- A hydraulic weep at the hub
Mechanical faults usually mean a worn slew ring or bearing. Hydraulic faults often point to failed internal hoses or worn seals. We strip the unit, inspect the slew ring, and replace the worn parts. We then re-test for smooth 360-degree rotation.
Repairing Worn Shells and Cutting Edges
Worn shells and blunt edges stop a grab holding material cleanly. The cutting edges are replaceable wear items made from 500 HB steel. Once they wear through, shell damage speeds up.
Shell repair can involve several jobs:
- Hard-facing or re-facing worn shell plate
- Crack repair by coded welding
- Straightening distorted shells
- Re-machining elongated pivot bores
- Re-pinning and re-bushing the joints
Renew the cutting edges before they wear into the shell itself. Catching this early keeps the repair cheap. Leaving it costs far more later.
Heavy machining like line boring happens in our workshop. Read about our in-house machining and engineering capability for the detail.
How a Kinshofer Grab Overhaul Works
A full hydraulic grab overhaul follows five clear steps. This keeps the work transparent and the grab reliable on return.
- Strip and clean. We dismantle the grab and clean every part.
- Inspect and measure. We check the cylinders, rotation unit, shells, pins and hoses.
- Report and quote. You get a clear quote before any repair starts.
- Repair or re-engineer. We fix the fault, and redesign any part that keeps failing.
- Re-test. We pressure-test and function-test the grab before it ships back.
Step four is where we differ from a simple parts swap. A recurring fault gets engineered out, not just replaced. Our bespoke hydraulic design service supports this work.
Should You Repair, Rebuild or Replace Your Grab?
Repair suits an isolated fault on a sound grab. A rebuild fits a grab with several worn systems but a solid core. Replacement only makes sense after major structural failure.
Use this table as a quick guide:
| Option | Best when |
|---|---|
| Repair | One clear fault, shells and frame still sound |
| Rebuild | Several worn systems, but the core structure is solid |
| Replace | Catastrophic structural failure or beyond economic repair |
Factor in downtime cost and any history of repeat faults. A grab that keeps failing the same way is a design problem. We can re-engineer that weakness out rather than sell you the same flaw twice.
Lifting equipment must be kept in safe working order. According to the Health and Safety Executive, lifting equipment needs regular inspection and maintenance. A worn grab is both a downtime risk and a safety risk.
Why Choose an Independent Kinshofer Grab Repairer?
You do not have to send a Kinshofer grab back to its original supplier. An independent specialist can overhaul it fully, often faster and at lower cost. We repair hydraulic grabs of all major makes on 1 to 27 tonne excavators, whatever the supply route.
Our in-house design and workshop handle the whole job under one roof. We strip, inspect, repair, re-test and re-engineer. We hold ISO 9001:2015 and Achilles accreditation for proven quality.
Experience backs this up. We overhaul grabs run hard by demolition, recycling and hazardous-waste operators. One sorting grab kept losing its closing force. The real fault was the relief valve, so we re-engineered it out.
See examples of our grab overhaul work for proof. We also offer on-site repair and fault finding when a grab cannot travel.
Kinshofer Grab Repair FAQs
Can a Kinshofer grab be repaired by a third party?
Yes. An independent specialist can fully overhaul a Kinshofer grab, whatever its supply route. A capable workshop strips, inspects, repairs and re-tests the cylinders, rotation unit and shells. It can also re-engineer a recurring fault. You do not need to use the original supplier.
Why has my Kinshofer grab lost its closing force?
Lost closing force usually means the cylinders cannot hold pressure. The causes are worn seals, a scored rod, internal bypass, or a low relief valve. The repair is to pressure-test the circuit, strip the cylinder, then reseal or rebuild it and re-test.
Why won’t my grab rotate?
Turning problems come from the integrated rotation unit. The slew ring or bearing may be worn, or the internal hoses may have failed. Symptoms include no rotation, one-way movement or jerky turning. We strip and rebuild the unit for smooth 360-degree rotation.
How much does a Kinshofer grab repair cost?
Cost depends on the fault, the grab size and how many systems are affected. A single cylinder reseal differs greatly from a full overhaul. The reliable way to price it is a strip-and-inspect. You then get a clear quote before any work begins.
Is it worth repairing a grab or replacing it?
Often repair is the better value choice. It suits an isolated fault on a grab with sound shells and frame. A full rebuild fits several worn systems on a solid core. Replacement only makes sense after major structural damage.
Get Your Kinshofer Grab Back to Work
Nearly every Kinshofer grab fault traces back to a few wear points. Almost all are fixable by an accredited specialist. The right repair restores closing force, smooth rotation and a clean grip.
Send us the symptoms and a few photos for a no-obligation quote. We are based in Kent and serve operators across England. Call the workshop or request a grab repair quote today.
Not sure if it is a cylinder or a relief-valve fault? Tell us the symptoms and we will point you the right way.