Bulldozer Komatsu D39EX-22 D39PX-22 Hydraulic Pump Main Pump Piston Pump 720-2M-00070 708-2M-00071 708-2M-04210

High-performance hydraulic main pump designed specifically for Komatsu D39EX-22 and D39PX-22 bulldozer models. This piston pump ensures reliable operation and optimal hydraulic system performance.

Compatible Models: Komatsu D39EX-22, D39PX-22

Part Numbers: 720-2M-00070, 708-2M-00071, 708-2M-04210

• Abnormal pump noise: Worn pistons & slippers, scratched valve plate; air ingress in suction line, contaminated hydraulic oil
• Insufficient output pressure: Internal leakage caused by worn piston assembly and aged seals; faulty pressure regulator
• Slow movement: Reduced volumetric efficiency and insufficient flow; clogged filter element, excessive suction resistance
• Abnormally high oil temperature: Heavy internal leakage and increased friction; wrong hydraulic oil grade or deteriorated oil
• Pump housing leakage: Aged or damaged end cover seals & O-rings; uneven bolt torque, cracked pump housing

• Verify stamped part number on old pump and bulldozer model before ordering
• New or remanufactured assemblies available - confirm test report and warranty for reman units
• Inspect hydraulic oil and suction filter simultaneously during replacement
• Replace full seal kit during installation to prevent premature failure
• Pre-commissioning inspection: Check housing for damage, verify port threads and nameplate
• Perform no-load test for pressure and noise after delivery
• Storage: Keep in dry, dark environment; seal oil ports against dust and moisture