3 footer cone crusher manual drawing

Technical Overview of 3-Footer Cone Crusher Manual Drawing

This article provides a technical examination of manual drawings for a 3-foot cone crusher, focusing on their critical role in maintenance, part identification, and assembly. It will detail the essential components typically illustrated in such manuals, compare key design aspects, and underscore their practical application through a real-world case study. Furthermore, a FAQ section will address common queries related to these technical documents.

Manual drawings for a Symons 3-foot cone crusher are not merely illustrations; they are foundational engineering documents. They serve as the primary reference for correct assembly sequence, part interchangeability, and understanding the relationship between components. Key views typically include:

• Exploded Assembly Views: Showing the disassembled relationship of all parts.
• Cross-Sectional Views: Revealing internal assemblies like the eccentric bushing, main shaft, and crushing cavity.
• Detailed Part Drawings: Specifying dimensions, tolerances, and material callouts for individual wear parts like mantles, concaves, and gears.

A crucial function of these manuals is to differentiate between various models and configurations. For instance, there are distinctions between standard and shorthead configurations for finer product. The table below contrasts some core aspects often detailed in manual drawings for these two common 3-foot cone crusher types:

Feature	3-Foot Standard Cone	3-Foot Shorthead Cone
Crushing Cavity Profile	Designed for secondary crushing; steeper head angle coarser product.	Designed for tertiary/fine crushing; flatter head angle finer product.
Feed Opening	Larger relative to mantle diameter.	Smaller relative to mantle diameter.
Typical Drawings Focus	Illustrates heavier frame components for coarser feed.	Emphasizes finer liner profiles (mantle & concave) and adjustment mechanisms.
Product Size Range	Coarser output (e.g., 20-50mm).	Finer output (e.g., 5-20mm).

Real-World Application: A Maintenance Case Study
A mining operation in Chile experienced repeated premature failure of the eccentric bushing on their Symons 3-foot standard cone crusher. The maintenance team relied heavily on the manual's cross-sectional drawings and bill of materials (BOM). The drawings clearly illustrated the oil flow paths and lubrication grooves on the bushing's exterior surface. By comparing the drawing to the failed part, they identified that a non-OEM replacement bushing had been installed with incorrectly machined grooves, leading to insufficient lubrication and overheating. Following the manual's specified part number and dimensional drawing, they sourced the correct OEM-specified bushing. The subsequent installation followed the assembly sequence in the manual, ensuring proper clearances as per the sectional views. This resolved the failure issue, extending component life by over 40% and validating the drawing's critical role in correct part procurement and assembly.

Frequently Asked Questions (FAQ)

1. Q: Why is it important to use the specific manual drawing for my crusher's serial number?
   A: Even within 3-foot cone crushers from the same manufacturer (like Symons/Nordberg), there were engineering revisions over decades of production. Using an incorrect manual may lead to errors in part numbers (e.g., for seals or thrust bearings), assembly tolerances, or bolt specifications, resulting in improper assembly and potential machine damage.

2. Q: What are the most critical dimensions to check on a cone crusher manual drawing during a rebuild?
   A: Key dimensions include: Main shaft clearance with eccentric bushing; Piston ring gap for the hydraulic adjustment system; Gear backlash between bevel gear and pinion; and specified thread engagement for locking nuts on the main shaft.

3. Q: Can I use CAD models instead of paper or PDF manual drawings?
   A: While modern CAD models are valuable, original manufacturer manual drawings remain authoritative for legacy equipment like many 3-foot cones. They contain approved engineering notes, revision histories, material specs, and proprietary tolerances that may not be fully replicated in unofficial CAD files.

4. Q: How do I identify which liner (mantle/concave) profile my crusher uses from the drawing?
   A: The parts list or schedule within the manual will correlate a specific drawing number or code (e.g., "Profile C") to a part number. The corresponding detailed drawing will show the exact contour radii and thicknesses that define that crushing cavity profile.

5. Q: The manual shows a "wrench flat" or special tool—is it necessary?
   A: Yes. Drawings often specify special tools (like a hook wrench for adjusting caps) to apply correct torque without damaging components during disassembly/assembly (e.g., looseningthe mantle locking nut). Using improvised tools can lead to rounded fittings,dangerous slippage,and incorrect preload