Protect your breaker’s front head and optimize tool alignment with the Merit Lower Tool Bushing, specifically engineered for the Rammer 5011E hydraulic hammer. As a primary wear part, the lower bushing is designed to be the sacrificial component that absorbs abrasive friction and side loads, preventing expensive damage to the hammer’s main housing and internal piston.
Product Specifications
| Feature | Details |
|---|---|
| Product Name | Lower Tool Bushing / Lower Bushing |
| Part Number | 178418 (also matches 171139) |
| Compatible Model | Rammer 5011E / 5011 |
| Material | Wear-Resistant High-Alloy Steel |
| Inner Diameter | Optimized for 190mm Tools |
Why Choose the Merit Lower Bushing for Rammer 5011E?
The Rammer 5011E is a high-production hammer. When the lower bushing wears out, the tool begins to “wobble,” causing uneven piston strikes. Merit bushings are built to maintain perfect tool geometry:
1. Field-Replaceable Design
The 178418 bushing is designed for easy field replacement. Our precision machining ensures a “slip-fit” that stays secure during operation but can be removed using standard extraction tools, minimizing your downtime during scheduled maintenance.
2. Advanced Lubrication Channels
Merit bushings feature deep, optimized grease grooves. These channels ensure that chisel paste is distributed evenly around the tool shank, reducing heat buildup and preventing the “galling” (metal-to-metal welding) that can seize a tool inside the breaker.
3. Superior Hardness & Ductility
Using a specialized heat-treatment process, we create a bushing with high surface hardness to resist abrasion from rock dust, while maintaining a ductile core to withstand the intense side-loading forces common in trenching and primary breaking.
Maintenance & Wear Limits
To protect your Rammer 5011E, monitor the lower bushing regularly:
- The “Groove” Rule: On a Rammer 5011E, if the first three internal grease grooves are no longer visible due to wear, the bushing must be replaced.
- Measure Clearance: If the gap between the tool and the bushing exceeds the factory wear limit (typically 5-8mmdepending on the application), it will cause the piston to strike the tool at an angle, leading to catastrophic internal scoring.
- Rotation Tip: If the bushing shows uneven wear but is still within limits, it can often be rotated 90 degrees to extend its service life before a full replacement is needed.
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