Kubota KX71-3 Mini Excavator – Parts, Specs & Serial Number Guide

Description:

The Kubota KX71-3 is a versatile 3-ton class mini excavator known for its compact design, strong breakout force, and easy service access. Designed with a conventional tail swing and a wide working range, the KX71-3 is ideal for trenching, grading, utility work, and residential construction. Its robust performance and reliability have made it a go-to machine for contractors and rental companies alike.

Key Specifications:

Engine:

• Model: Kubota V1505-E2-BH-1

• Type: 4-cylinder, liquid-cooled diesel

• Displacement: 91.5 cu in (1.498 L)

• Gross Power: 23.5 hp (17.5 kW) @ 2,350 rpm

Transmission & Travel:

• Travel Speed: Low: 1.6 mph (2.6 km/h), High: 2.9 mph (4.6 km/h)

• Drive Motors: Hydraulic piston motors with 2-speed automatic downshift

Hydraulic System:

• Pump Capacity: 32.2 + 32.2 + 19.2 l/min (triple pump system)

• Auxiliary Flow: 13.2 gpm (50 L/min)

• Max Hydraulic Pressure: 2,560 psi (176 bar)

• Controls: Pilot-operated joystick with auxiliary circuit

Dimensions:

• Operating Weight: 6,305 lbs (2,860 kg)

• Max Digging Depth: 9 ft 9 in (2.97 m)

• Max Reach at Ground Level: 15 ft 9 in (4.8 m)

• Tail Swing Radius: 3 ft 5 in (conventional)

Performance:

• Bucket Breakout Force: 6,350 lbf (28.3 kN)

• Arm Digging Force: 3,290 lbf (14.6 kN)

Maintenance & Common Parts:

Routine Maintenance Schedule:

• Engine oil/filter: every 250 hours

• Hydraulic fluid/filter: every 500 hours

• Air filter: inspect every 100 hours

• Grease pivot points and track rollers: daily during use

Frequently Replaced Parts:

• KX71-3 Hydraulic Cylinder Seal Kits

• Final Drive Motors

• Rubber Tracks & Undercarriage Parts

• Fuel, Air & Oil Filters

• Thumb Kits & Quick Couplers

Common Issues & Quick Fixes:

• Hydraulic thumb not working: Check the auxiliary valve flow rate and switch—replace faulty joystick or control valve components.

• De-tracking or rough travel: Likely due to worn sprockets or loose track tension—adjust or replace with track and undercarriage kits.

• Low hydraulic power: Often due to clogged filters or failing pump—replace filters and inspect lines for contamination.

Pro Tips:

• Keep the auxiliary circuit capped when not in use to prevent debris from contaminating the system.

• Use the blade float function when grading or backfilling for smoother operation.

• Monitor idler wear monthly—early replacement can prevent costly undercarriage repairs.

Serial Number Location:

• Located on a metal plate on the front-right side of the frame, near the boom swing pivot, and inside the cab below the operator seat.

• Always reference the serial number before ordering Kubota KX71-3 parts to ensure compatibility.