Case CX31B Mini Excavator

Description:

The Case CX31B Mini Excavator is a compact yet powerful machine ideal for residential, utility, and light construction jobs. With its tight tail swing and impressive digging power, the CX31B delivers high performance in confined spaces. Known for ease of operation, fuel efficiency, and low maintenance needs, it's a favorite for contractors seeking reliable compact equipment.

Engine & Power

• Engine: Yanmar 3TNV88

• Horsepower: 29.9 hp (22.3 kW) @ 2,400 rpm

• Displacement: 1.642L (100 cu in)

• Fuel Capacity: 10.5 gallons

Hydraulic System

• Main Pumps: Two variable displacement axial piston pumps + one gear pump

• Hydraulic Flow: 17.4 gpm (combined)

• System Pressure: 3,133 psi

• Control System: Load-sensing hydraulics for smoother multi-function control

Performance & Capacity

• Operating Weight: 7,110 lbs

• Maximum Dig Depth: 9 ft 11 in

• Max Reach at Ground Level: 16 ft 6 in

• Bucket Breakout Force: 6,900 lbf

• Arm Digging Force: 4,180 lbf

Travel & Swing

• Travel Speeds: 1.4 mph (low), 2.7 mph (high)

• Swing Speed: 9.1 rpm

• Tail Swing: Minimal for tight job sites

Key Features

• Zero tail swing design for tight space operation

• Spacious operator station with pilot controls

• Optional hydraulic thumb and quick coupler

• Foldable ROPS canopy or enclosed cab option

• Easy-access maintenance points and onboard diagnostics

Maintenance & Common Issues

• Frequently Replaced Parts:

  • Hydraulic cylinder kits

  • Rubber tracks

  • Track rollers and sprockets

  • Engine belts and filters

• Common Issues & Fixes:

  • Track tension issues: Caused by wear or debris buildup – Shop mini excavator undercarriage parts

  • Hydraulic leaks at boom or bucket: Typically due to worn seals – Explore cylinder seal kits

  • Starter failure in cold weather: Check battery health and glow plugs – See Case electrical parts

Pro Tip: The serial number is stamped on the right side of the boom near the boom cylinder or inside the operator’s compartment. Always confirm serial before ordering any parts.

Browse Case CX31B parts for affordable, durable replacements that keep your mini excavator running strong.