A4VSO40EO1/10R-VPB13N00A4VSO40EO1/10R-PPB13N00A4VSO40LR2/10R-VPB25N00Rexroth axial mechanical piston pump imported from Germany

A13: Main causes and solutions: 1) Severe internal leakage: Check the piston-cylinder pair, swashplate, and valve plate for wear (if wear exceeds 0.1 mm, replace the parts); 2) Load-sensing control valve failure: Disassemble the PZB13 valve, clean the pressure feedback oil passage, and replace the aging spring; 3) Relief valve is set too low: Re-calibrate the relief valve to the rated pressure (31.5 MPa); 4) Air in the system: Bleed the air as per Q12; 5) Clogged oil filter: Replace the filter element and clean the oil tank; 6) Hydraulic oil viscosity is too low: Replace with oil of the correct viscosity (ISO VG 46).

A14: Common reasons and fixes: 1) Unstable load-sensing signal: Check the pressure feedback pipeline for blockage, clean the pipeline, and ensure the signal line is tightly connected; 2) Worn control valve core: Replace the PZB13 control valve core or apply lapping to restore sealing; 3) Air mixed in the oil: Bleed the system; 4) Clogged oil suction filter: Clean or replace the filter element; 5) Variable mechanism jamming: Disassemble the swashplate mechanism, clean the guide rail, and apply molybdenum disulfide lubricant; 6) Voltage fluctuation of the control circuit (if equipped with electric control): Stabilize the power supply voltage (±5% of rated value).