Ensure perfect piston-to-tool alignment with the Merit Upper Tool Bushing, specifically designed for the Rammer 5011E hydraulic hammer. While the lower bushing handles side loads, the upper bushing is critical for centering the tool (chisel) so that the piston delivers 100% of its impact energy directly into the center of the tool. A worn upper bushing is the leading cause of “offset” strikes, which can result in a cracked piston or damaged cylinder.
Product Specifications
| Feature | Details |
|---|---|
| Product Name | Upper Tool Bushing / Thrust Bushing |
| Part Number | 168291 |
| Compatible Model | Rammer 5011E / 5011 |
| Material | Hardened High-Tensile Alloy Steel |
| Function | Upper Tool Guide and Piston Protection |
Why Choose the Merit Upper Bushing for Rammer 5011E?
The Rammer 5011E is a heavy-duty breaker where precision is everything. Merit upper bushings are engineered to handle the intense vibrations of the 5-ton class:
1. Precision Centering
Our 168291 bushing is machined to micron-level tolerances. This ensures that the tool is held perfectly vertical. By keeping the tool centered, you protect the strike face of the piston from “corner loading,” which is the primary cause of piston chipping and fracturing.
2. Superior Surface Hardness
The upper bushing operates in a high-temperature environment. Merit uses a specialized induction hardening process that allows the bushing to resist the abrasive “sliding wear” of the tool shank without becoming brittle under the hammer’s high-frequency impact.
3. Optimized Oil and Grease Flow
Designed with internal channels that match the Rammer 5011E lubrication system, this bushing allows chisel paste to flow correctly to the upper part of the tool shank. This prevents “dry-rubbing” and seizures between the tool and the guide.
Key Benefits
- Piston Safety: Dramatically reduces the risk of expensive piston failure due to misalignment.
- Extended Tool Life: Prevents the tool shank from sustaining uneven wear patterns.
- OEM Standard: 100% dimensional match for Rammer part number 168291.
Maintenance Tip: The “Chain Reaction” of Wear
Never replace just the lower bushing if the Upper Bushing (168291) is worn.
- If the upper bushing is loose, the tool will tilt, putting massive leverage on the lower bushing and causing it to wear out twice as fast.
- The Rule: Always check the clearance of both bushings during your 500-hour service. If the tool can “rock” more than a few millimeters inside the housing, it is time to replace the upper guide.
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