Case 621B Wheel Loader | Specs & Serial Number Guide

Description:

Serial Number Location

To determine the exact year and part compatibility for your Case 621B Wheel Loader, locate the serial number:

• Primary Location: On the left-hand side of the front frame, near the cab entry step

• Alternate Location: Inside the cab, typically on the data plate behind or under the seat

Serial numbers for this model start with JAL and are essential when ordering engine, hydraulic, or control system components.

Serial Number Reference by Year

Key Specifications

Key Features

• ✅ Upgraded Hydraulic Flow (47 GPM) – Increases cycle speed and loader responsiveness

• ✅ Case 6T-590 Engine – Reliable power with turbocharged efficiency

• ✅ Heavy-Duty Frame & Linkage – Built for high-cycle jobsite operations

• ✅ Improved Operator Comfort – Enhanced cab layout, better visibility, and easier control access

• ✅ High Lift & Dump Clearance – Great for loading tall trucks and material bins

Maintenance & Common Issues

 Routine Maintenance

• Engine & Fuel Filters – Every 250 hours

• Hydraulic Filter & Fluid – Every 500 hours

• Transmission & Differential Service – Every 1,000 hours

• Loader Linkage Greasing – Weekly or daily in abrasive environments

• Brake System – Check master cylinders and accumulators regularly

⚠️ Common Issues & Solutions

• Hydraulic Drift or Weak Lift – Replace cylinder seals or inspect control valves – shop hydraulic kits

• Loader Arm Pin Wear – Install replacement bushings and pins for proper alignment

• Overheating – Check radiator, fan clutch, and thermostat function

• Transmission Hesitation – Service shuttle solenoids and pressure sensors – view transmission parts