Model Spotlight

Case 420 Skid Steer Loader: 2005-2008 400-Series Tier 3 Skid Steer

The Case 420 is part of Case's 400-series skid steer / compact track loader family - Tier 3 compact diesel, hydrostatic dual-path drive, and the operator interface that bridged the XT-series and the modern alpha (SR/SV/TR/TV) lineup. Produced from 2005 through 2008, the 420 represents the mid-2000s mid-class Case skid steer loader.

BT

Broken Tractor Editorial Team• Updated May 2026• 8 min read

Where the 420 fits in the Case skid steer / CTL line

The 420 sits in the Case 400-series skid steer / CTL range between the Case 410 and the Case 420CT compact track loader. Tier 3 compact diesel architecture, electronic engine controls, and the cab and instrumentation that defined Case's mid-2000s skid steer / CTL line before the alpha rename to the SR/SV/TR/TV family.

Engine, hydraulics, and drivetrain

The 420 runs a Tier 3 compact diesel through a hydrostatic dual-path drivetrain. Loader hydraulics use a piston pump with electrohydraulic control valves, and a wet-disc park brake is integrated with the hydrostatic deceleration logic. The cab and instrumentation moved a generation ahead of the XT-series predecessor with electronic engine controls and a modern instrument cluster.

Loader lift and bucket tilt cylinders run common Case/New Holland alpha-series cross-fit seal kits, which keeps rebuild parts well-supported across the broader skid steer family.

Common service items on the 420

• Engine internals: Tier 3 compact diesel - pistons, rings, sleeves, bearings, gaskets.
• Fuel system: Common-rail injectors, lift pump, tight water-separator filtration, fuel filters.
• Cooling system: Radiator, water pump, thermostat, fan, charge-air cooler, hoses, belts.
• Hydraulics: Loader lift and bucket tilt cylinder seal kits (86570919 / 86570931 / 86570922 cross-fit on NH/Case alpha-series), piston-pump rebuilds, electrohydraulic control valves.
• Drivetrain: Hydrostatic dual-path pumps and drive motors, charge pump, hydraulic filters.
• Hardware: 191048A2 axle stud & nut cross-fits broadly across the Case skid steer line.
• Brakes / control: Park brake, control linkage, 48139268 control shock absorber on Case/NH alpha-series control valves.
• Electrical / ECU: Engine ECU, machine controller, instrument cluster, sensors, wiring harness.
• Cab / operator station: Cab HVAC, seat, gauges, joystick controls, cab glass, 47405956 windshield wiper blade on cab-equipped units.

Parts we carry for the Case 420 Skid Steer Loader

What to verify before ordering

• Serial number. Confirm the serial on the 420 before ordering year-specific parts - the 400-series saw running changes.
• Engine serial. Internal engine parts must match the engine serial number.
• Aftertreatment configuration. Tier 3 configuration varies by build year - confirm EGR/aftertreatment layout before ordering.
• Hydraulic cylinder bore. Cylinder seal kit fit depends on bore dimension - measure before ordering.
• Cab vs. ROPS canopy. Operator station equipment varies between cab-equipped and ROPS canopy configurations.

Why the 420 still earns a paycheck

The Case 420 is the mid-2000s Case skid steer loader that bridged the XT-series and the current alpha lineup. Tier 3 emissions, modern electronics, and the cab ergonomics that put the operator in a better seat than the XT predecessor. The 400-series shares a deep parts pool with the New Holland LS/L-series and the later Case alpha-series, which keeps rebuild components well-supported.

Maintenance priorities on a 420: clean fuel and tight water separation for common-rail injection, hydrostatic charge pressure, drive-chain tension, and cylinder seal condition. Broken Tractor maintains parts coverage across the 400-series and the broader Case skid steer / CTL family.