Case 621D Wheel Loader Detailed Specifications and Performance

[MikePhua]

Machine Overview
The Case 621D is a mid-sized wheel loader designed for versatile applications including material handling, construction, and earthmoving. Known for reliable power, balanced hydraulics, and operator comfort, it is favored in diverse jobsite environments.
Dimensions and Capacity

• Operating weight is about 26,083 pounds (11,831 kg), providing stability with maneuverability.
  
• Length with bucket on ground measures approximately 23.1 feet (7,036 mm).
  
• Width over tires is near 7.8 feet (2,382 mm).
  
• Height to cab top is around 10.8 feet (3,306 mm).
  
• Wheelbase is 9.5 feet (2,900 mm).
  
• Ground clearance is about 1.6 feet (474 mm).
  
• Bucket capacity ranges up to 3 cubic yards (2.3 cubic meters) heaped, with struck capacity near 2.6 cubic yards (2 m³).
  
• Bucket width measures 8.5 feet (2,602 mm).
  

Engine and Power

• Powered by a Case Family III 668TA/M2 turbocharged engine with air-to-air cooling.
  
• Net power output is approximately 136 hp (101.4 kW) at 2,000 rpm.
  
• Gross power is near 148 hp (110.4 kW).
  
• Maximum torque is 495 lb-ft (671.1 Nm) measured at 1,200 rpm.
  
• Torque rise of 33% helps provide power under load.
  

Hydraulic System

• Hydraulic fluid capacity is approximately 30 gallons (113.6 liters).
  
• The system operates with a closed center pressure/flow compensated pump.
  
• Pump delivers about 45.2 gallons per minute (171 L/min).
  
• Relief valve pressure set around 3,600 psi (172.4 bar).
  
• Hydraulic functions operate with raise times around 5.4 seconds, dump times near 1.5 seconds, and lower times at 5 seconds.
  
• Bucket breakout force measures about 23,237 pounds.
  

Transmission and Drive

• Transmission features 4 forward and 3 reverse gears with autoshift/manual shift options.
  
• Max forward speed reaches roughly 24 mph (38.6 km/h).
  
• Max reverse speed is about 15.6 mph (25.1 km/h).
  
• Torque sensing electronic control module handles torque modulation.
  

Additional Specs

• Tire size is 20.5x25 L3.
  
• Turning radius is approximately 17 feet (5,175 mm).
  
• Operating voltage is 24 volts with a 70-amp alternator.
  
• Rear axle oscillation angle about 24 degrees for enhanced traction.
  

Maintenance and Parts Availability

• Fluid capacities for engine oil, transmission, cooling, and differentials range from 4.3 gallons to 6.4 gallons depending on subsystem.
  
• Replacement parts for hydraulic cylinders, pins, bushings, sheet metal, and other components are widely available through OEM and aftermarket suppliers ensuring quick turnaround.
  
• Proper maintenance reduces downtime and preserves machine longevity.
  

Glossary

• Torque Rise: Percentage increase in engine torque output available under load.
  
• Closed Center Hydraulic System: A system where the pump flow is controlled and delivered as needed rather than continuously.
  
• Breakout Force: Maximum force the bucket can exert to break soil or material.
  
• Autoshift Transmission: Transmission that automatically shifts gears based on load and speed.
  
• Rear Axle Oscillation: Swinging movement of rear axle to maintain ground contact on uneven terrain.
  

Summary
The Case 621D wheel loader combines efficient turbocharged power with a responsive hydraulic system and versatile transmission options, suitable for a broad range of heavy-duty applications. Ample bucket capacity and breakout force, along with nimble dimensions and a strong hydraulic flow rate, ensure productivity and operational agility. Coupled with available maintenance support and robust design, the 621D remains a dependable choice in wheel loader fleets.