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The repair process of the Bobcat M44 Sauer Danfoss hydraulic travel pump requires precise diagnostic analysis, as the pump operates at pressures up to 350 bar and flow rates near 90 liters per minute. Mechanical wear of pistons, valve plates, or bearings can reduce volumetric efficiency by more than 15 percent, leading to significant loss of travel power. Early symptoms often include unusual vibration, high oil temperature exceeding 85°C, and reduced response time in forward or reverse drive cycles.
Common causes of hydraulic pump failure in the Bobcat M44 include oil contamination above ISO 18/16/13 levels, cavitation due to improper suction line sizing, and overheating caused by insufficient cooling. Even a 10 µm particle entering the pump chamber can damage the swash plate surface, reducing service life by over 30 percent. Preventive maintenance such as oil filtration checks, seal inspection, and pressure relief valve calibration is critical for extending operational hours.
Repair costs for a Bobcat M44 Sauer Danfoss travel pump vary from 1,200 to 2,500 depending on the extent of component replacement, labor, and testing procedures. A full rebuild may require up to 12 working hours, including disassembly, precision lapping of valve plates, piston shoe replacement, and performance testing under load conditions. Professional workshops use test benches calibrated at 300 bar to verify efficiency recovery above 90 percent before delivery, ensuring reliability and long service life for demanding construction environments.
WEBSITE: N44 sauer danfoss bobcat pump repair Iran
