Excavator · wheel loader · mining loader pivot pins
Ground pins and one-piece slotted sleeves are made to your drawing for worn joints, with installation possible without line boring in suitable applications.
Four short steps show how tightening creates controlled sleeve expansion in the worn joint.
expanding pivot pin manufacturer
As an expanding pivot pin manufacturer, we produce custom expanding pins for a worn lug bore from the customer’s approved drawing. A ground tapered pin moves through one-piece slotted sleeves; tightening the end hardware drives each sleeve along the taper and seats its straight outside diameter against the bore. The arrangement can remove play without line boring when the measured wear, loads and joint geometry are suitable. Excavator, wheel loader and mining loader pivot pins are reviewed as application-specific parts, not catalogue items. Diameter, length, sleeve travel, material, hardness, surface finish and acceptance dimensions are fixed on the drawing before production.
Include bore measurements, pin length, material and quantity.
No account needed · or by email: info@cnc-turkey.com
Technical scope
| Parameter | Specification | Detail |
|---|---|---|
| Pin diameter | Ø30–500 mm | Drawing-defined |
| Length | Up to 4000 mm | Workholding and straightness reviewed from the drawing |
| Materials | 42CrMo4 · 34CrNiMo6 · 8620 · 20NiCrMo2-2 | Quenched & tempered/induction hardened, or case hardened |
| Surface | Ground, Ra down to 0.4 µm | On functional surfaces |
| Coating | Optional hard chrome | Specified on the drawing |
| Sleeves | One-piece slotted, straight OD | Internal taper matches the pin |
| Expansion range | Defined by sleeve design | Defined on the drawing |
| Documents | Inspection report + material certificate | EN 10204 3.1 on request |
The system is considered for moving, highly loaded joints where restoring the bore by on-machine work would create long downtime. Each position still needs measured bores and a drawing review.
Measure the worn lug bore in two directions rather than reporting one nominal diameter. These readings let us review the sleeve geometry and define the expansion range on the drawing.
Reference work: long pivot pins up to 4 m for underground mining loaders, produced to drawing.
Lead time starts after drawing approval and material confirmation. The figures below are planning ranges; final timing is confirmed with diameter, length, heat treatment, coating and quantity.
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FAQ
Yes, in suitable joints. The sleeves can seat in a worn lug bore with no line boring, but the decision depends on 0°/90° measurements on both ears, load and joint geometry.
There is no universal value. Capacity depends on sleeve design and is defined on the drawing from the measured worn lug bore diameters.
Typical applications include excavator boom, arm and bucket linkage; wheel loaders; underground mining loaders; cranes, material handlers, forestry and agricultural machines.
42CrMo4 and 34CrNiMo6 can be quenched and tempered or induction hardened; 8620 and 20NiCrMo2-2 can be case hardened. Target hardness is drawing-defined.
Yes. Pins from Ø30–500 mm and up to 4000 mm long can be produced after drawing review confirms weight, straightness, grinding and heat-treatment feasibility.
Yes. The pin, matched slotted sleeves and drawing-defined end hardware can be supplied together as a revision-controlled replacement set for repeat orders.
RFQ
Quantity, material, quality requirements and delivery country help us review the appropriate manufacturing and shipment route.
No account needed.
Your drawings are kept confidential and used only for quotation.
