Case 721C Wheel Loader – Parts, Specs

Description:

Serial Number Location:

For the Case 721C (manufactured from 1999 to 2005), the serial number plate is typically located on the left side of the main frame, just behind the front left tire or near the articulation joint. Confirm the serial number before ordering parts, as several upgrades were introduced during this series.

Key Specifications

• Years Manufactured: 1999 – 2005

• Engine Model: Cummins 6CTA8.3 (6-cylinder turbo diesel)

• Net Horsepower: 155 HP @ 2,200 rpm

• Maximum Torque: 525 lb-ft @ 1,500 rpm

• Displacement: 504 cu in (8.3 L)

• Transmission Type: 4-speed full powershift with 4 forward and 3 reverse gears

• Hydraulic Flow Rate: 42 gal/min

• Hydraulic Pressure: 3,100 psi

• Operating Weight: Approx. 30,000 lbs

• Bucket Capacity: 2.75 – 3.5 cubic yards

• Breakout Force: 27,500 lbs

• Top Travel Speed: 23 mph

• Dimensions (L×W×H): Approx. 27 ft × 8.2 ft × 11.2 ft

Performance & Design Highlights

• More Power, Bigger Capacity: The 721C featured a larger Cummins 8.3L engine and higher breakout force, designed for quarry, aggregate, and high-volume material handling.

• Upgraded Transmission: Full powershift transmission delivers smooth gear changes, with improved clutch durability and manual/auto modes.

• Improved Cooling System: Enhanced airflow design reduces overheating in dusty or high-load environments.

• Precision Hydraulics: Closed-center hydraulic system delivers better control over lift/dump cycles and reduces operator fatigue.

• Spacious, Modernized Cab: Isolation-mounted cab reduces noise and vibration while improving visibility and control access.

Routine Maintenance

• Engine Oil & Filter: Every 250 hours

• Hydraulic Fluid & Filters: Every 1,000 hours

• Transmission Fluid: Every 1,000 hours

• Fuel Filters: Every 500 hours

• Air Filters: Inspect every 250 hours; replace as needed

• Cooling System: Flush and inspect annually or every 1,000 hours

Common Issues & Fixes

• Loader Hydraulics Slow or Noisy: Check for air in system, inspect pump condition, and replace clogged return filters

• Transmission Harsh Shifting or Hesitation: Inspect clutch solenoids and recalibrate shift logic using a diagnostic tool

• Loader Pin Wear or Arm Slop: Replace worn pins and bushings, especially at bucket pivot and tilt linkage

• Overheating During Load Cycles: Clean radiator and coolers; inspect fan clutch and verify airflow clearance

• Cab Electrical Problems: Inspect wiring under dash and behind fuse box—common source of short circuits and display faults

Pro Tip:

The 721C’s cooling and hydraulic systems are high-capacity but sensitive to contamination—regular filter changes and clean work environments are key. Transmission shift delays often come down to solenoid or clutch pack wear, which can be caught early with performance testing.