Koehring 440 Excavator and Crane Model Insights

[MikePhua]

Company Background and Product History
Koehring Company, established in 1907 in Milwaukee, Wisconsin by Phillip Koehring, became synonymous with rugged excavators and cranes throughout the 20th century. Koehring was a pioneer in cable and hydraulic machinery for construction and mining, continuously expanding its lineup. In 1967, Koehring acquired Thew-Lorain, further growing its product portfolio; by 1987, crane and excavator assets had become part of Terex Corporation after several mergers. Koehring-branded machines, including the 440 series, were sold across North America and globally, with thousands delivered during the brand’s peak decades.
Koehring 440 Spanner Lattice Boom Crawler Crane Specifications

• Capacity: 40 US tons (36,300 kg)
  
• Main boom length: 110 ft (33.5 m)
  
• Jib extension: 30 ft (9.2 m)
  
• Lifting limit: Up to 80,000 lbs (36,300 kg)
  
• Engine: Detroit 453, 4-cylinder diesel
  
• Transmission: Direct drive
  
• Base weight: Approx. 71,710 lbs (32,527 kg)
  
• Track shoes: 36 inches
  
• Drum configuration: Three drums (for crane, dragline, clamshell)
  
• Configured as both lifting crane and excavator, versatile for multiple site applications
  
• Years manufactured: 1970s through early 1980s
  

Key Features and Functions

• Multi-purpose capability for lifting, dragline excavation, clamshell digging, foundation work.
  
• Interchangeable boom and jib sections allow adaptation for different jobs.
  
• Rugged undercarriage with wide tracks for stability on soft ground and improved flotation.
  
• Mechanical brake system for load holding and smooth operation.
  
• Direct-drive transmission maximizes torque for demanding work cycles.
  

Performance and Applications

• Suitable for bridge building, quarry operations, heavy civil engineering tasks.
  
• Outstanding in tough environments due to durable powertrain and reliable Detroit Diesel engines.
  
• The 440’s central cab positioning and mechanical controls offer the operator clear visibility and tactile feedback, crucial for precise load movements.
  

Maintenance and Troubleshooting

• Regular service of engine, drums, and brake system is essential for maximum uptime.
  
• Track tension and shoe wear must be monitored to prevent ground engagement problems.
  
• Hydraulic components (when equipped) should be maintained with clean oil and prompt seal replacement.
  
• Genuine Koehring and Terex parts remain available through major suppliers for ongoing support.
  

User Experience and Anecdotes
A Minnesota contractor recalled a Koehring 440 hauling steel beams for a bridge project in the mid-1970s, citing reliability in cold conditions and minimal downtime. Another operator in Kansas noted the simplicity of Detroit Diesel engines allowed field repairs, keeping the crew productive despite challenging terrain.
On demolition sites, Koehring 440 cranes have been praised for their heavy-lift capacity and quick reconfiguration from crane to dragline, maximizing fleet efficiency.
Glossary

• Lattice Boom: A lightweight, strong truss-style boom ideal for long-reach lifts.
  
• Dragline: Excavation configuration where a bucket is dragged by cables for bulk earth moving.
  
• Clamshell: Bucket attachment for vertical digging or material loading.
  
• Direct Drive: Transmission design transmitting engine power directly to the work mechanism.
  
• Jib Extension: An additional, narrower boom section increasing reach or lift height.
  

Recommendations

• Maintain rigorous service schedules for engine and drivetrain components.
  
• Train operators thoroughly in mechanical control systems for safety and performance.
  
• Refer to historical service manuals and Terex parts catalogs for technical support.
  
• Regularly inspect boom and jib connections for fatigue or corrosion due to age.
  

The Koehring 440 remains a testament to American engineering principles, blending mechanical reliability and versatility, and continues to serve where strength and durability are still top priorities.