LIS® Replacement Parts for the CAT® J550 Tooth System
The massive heavy-duty system for mass excavation and rock handling in the 50- to 70-ton class.
The J550 system is designed for applications with very high shock and continuous loads, where maximum system reserves and holding forces are required.
LIS® carries precisely fitting J550 components (side-pin) for uncompromising use in heavy earthmoving and quarrying.
- Typical Machine Class: Frequently used on large excavators and heavy wheel loaders in the 50–70 t class (e.g., CAT 365, 374, 988, 990)
- Locking Mechanism: Horizontal locking (side-pin) with a highly dimensioned Ø 25 mm pin
- Warranty: Lifetime breakage warranty* on LIS® teeth and adapters
📞 +49 (0)2241 26 56 700
→ To the overview of all: Cat J-System
Notice: Brand names such as CAT® and J-Series serve exclusively for the technical identification of the mounting geometry. The items offered are high-quality LIS® replacement parts, not original parts from the machine manufacturer.
System Differentiation: The J550 Size
The J550 size is used exactly where locking elements or adapters of the smaller J460 class are disproportionately stressed in hard rock handling and a higher system reserve is required.
Tooth tips, adapters, and locking parts are only compatible within the J550 size.
→ Do you need a different system size?
[J200] | [J225] | [J250] | [J300] | [J350] | [J400] | [J450] | [J460] | [J550] | [J600] | [J700] | [J800] | ...back to J-Series overview
Technical Identification: Is it really J550?
In mass excavation, unambiguous system identification is essential. Use these reference values on the old part:
- 1. Typical J550 Part Numbers (Cast Numbers):
Common reference numbers for J550 tooth points end in "...552" (e.g., the standard tooth 9W-8552 or the rock tooth 9W-8552RC). - 2. Adapter Nose Dimension (Inch Rule):
As a rough technical guide, the thickness of the adapter nose for the J550 size is approx. 5.5 inches (approx. 140 mm). - 3. Dimensions of J550 Locking Elements:
The J550 locking pin (reference number 6Y-8558) has a diameter of Ø approx. 25.0 mm and an enormous length of approx. 163.0 mm. The corresponding retainer (8E-5559) measures approx. 52.0 mm in outer diameter.
Workshop Hint: Danger to life due to material fatigue
In the J550 load range, locking pins and retaining rings are extremely function-critical wear parts. In practice, reused retainers lead to reduced locking due to the loss of tension. The consequences are massive secondary damage to the adapter or sudden tooth loss during operation. Strict workshop rule: Consistently and systematically replace locking elements with every tooth change – especially if there is visible deformation or an unclear history of the old part.
Tooth Shapes and Adapters for Mass Excavation
The J550 tooth system offers high wear reserves for hard continuous use. LIS® carries the following profiles:
- Standard / Long (e.g., 1U3552 ): Universal profile for heavy mass excavation.
- Rock / Rock Chisel (RC): Massively reinforced for direct rock excavation.
- Rock Loader: Specific profile for the heaviest loading buckets in rock handling.
- Heavy Duty Abrasion (HD): Maximum wear volume on the back of the tooth.
- Penetration & Tiger / Twin-Tiger: Sharp profiles for extremely tough, compacted material.
- Wide / Paddle: For large-area clearing work.
To safely transfer the extreme breakout forces into the bucket, LIS® carries massive two-strap weld-on adapters (Heavy Duty) in the J550 segment for highly stable power transmission.
System Comparison: Alternatives to the J-System
Only the strongest tooth systems compete in the heavy-duty sector above 50 tons. If your machine is not equipped with the J550 side-pin locking mechanism, you will find these alternatives at LIS®:
- LIS® Replacement for CAT K-System: Vertical locking (twist-on) for extreme operations.
- Original ESCO® Ultralok®: Premium system with fully integrated locking (hammerless).
- LIS® Replacement for Bofors B-Lock: Widely used European tooth system with wedge locking.
What you should check before ordering
To avoid incorrect orders and fatal machine damage, please verify the following points:
- Is the stamp "J550" or a known part number (e.g., 9W-8552) legible on the old part?
- Is the adapter nose approx. 140 mm (5.5 inches) thick?
- Does the locking pin have a diameter of Ø approx. 25 mm and a length of approx. 163 mm?
- Have you added completely new locking elements (pin & retainer) to your cart?
If you are unsure, the LIS® technical sales team will be happy to assist you at any time.
📞 +49 (0)2241 26 56 700
Notice: Brand names such as CAT® and J-Series serve exclusively for the technical identification of the mounting geometry. The items offered are high-quality LIS® replacement parts, not original parts from the machine manufacturer.