John Deere AT487256 Hydraulic External Gear Pump

John Deere AT487256 Hydraulic External Gear Pump is a dual sections gear pump that has confirmed displacement of 39.5cc and 24.9 cc. Published information shows that the pump weight is 69.31 lb and measurements of 6.6 inches height, 11.8 inches width and 13 inches length. With its two sections, the drive assembly will provide hydraulic power to different or related demands within the corresponding machine circuit.

External gears move the oil through the interior of each housing from the inlet to the outlet. Since the displacement determines the theoretical output for every revolution, the 39.5 cc and 24.9 cc sections have to be connected to the corresponding parts of the circuit. Connection has to confirm the AT487256 model, equipment model, serial number range, shaft, rotation, mounting, and ports. Misconnection between the sections may result in different flow rate.

The proper oil flow and absence of contamination is essential for both sections. If there is some resistance in the suction side, any air entry, or inappropriate oil viscosity, then the cavitation and noise will occur. Contaminated oil may damage the gear faces, bushings and housing surfaces which causes more leakage. Technicians should also inspect the reservoir, filters, suction lines, cooler and relief settings before installation. The circuit needs to be cleaned if the previous pump produced any particles that could enter the replacement pump.

The mounting and drive alignments need to be verified because shaft loading can influence bearings and seals. Once the pump is primed, it must be turned on under low loads and the rotation, section deliveries, pressure responses, sounds, leaks and temperatures should be verified by the technicians. Section-by-section circuit testing might assist to determine whether the weak function is caused by the pump sections or other components.

We offer aftermarket new John Deere AT487256 Hydraulic External Gear Pumps and perform independent repairs, testing, maintenance, troubleshooting and installations of pumps. We also assist in pump section identification and configuration and supply spare parts through our independent hydraulic service team.