Case 621 Wheel Loader - Specs & Serial Number Guide

Description:

Serial Number Location

To identify the year and correct parts for the Case 621 Wheel Loader, locate the serial number in one of the following spots:

• Primary Location: On the left side of the front frame, near the cab mounting point

• Alternate Location: Inside the cab, on the metal data plate behind the operator seat or near the floor panel

Serial numbers typically start with JAK, followed by a 6-digit numeric code. Always reference this before ordering drivetrain, hydraulic, or engine components.

Serial Number Reference by Year

Key Specifications

Key Features

• ✅ High-Capacity 3.0 yd³ Bucket – Ideal for aggregates, sand, and bulk handling

• ✅ Turbocharged 130 HP Engine – Proven Case 6T-590 power and fuel efficiency

• ✅ Strong Breakout Force – Over 28,000 lbs for tough dig and lift conditions

• ✅ Advanced Hydraulics – Smooth, responsive controls for fast cycle times

• ✅ Durable Frame & Axles – Built for extreme construction and material yard environments

Maintenance & Common Issues

 Routine Maintenance

• Engine Oil & Filters – Change every 250 hours

• Hydraulic Fluid & Filters – Service every 500 hours

• Transmission Oil – Inspect every 1,000 hours

• Bucket & Loader Pins – Grease weekly or daily for high use

• Brake & Steering Fluid – Check regularly under heavy load cycles

⚠️ Common Issues & Fixes

• Hydraulic Cylinder Drift – Replace rod seals – shop seal kits

• Engine Overheating – Clean radiator, replace thermostat – engine parts here

• Transmission Shift Delay – Inspect power shuttle solenoids and fluid pressure

• Loader Arm Creep – Worn piston seals or defective control valve