YA00019027 Original Excavator Swing Motor for ZX870-5A

The original rotary motor (part number YA00019027, also commonly labeled as 4698624) is a hydraulic rotary motor assembly for the Hitachi ZX870-5G large excavator, mainly used to drive the upper rotary platform to achieve 360 ° continuous rotation. This motor is also widely used in Hitachi ZX870-5A, ZX870-5B and other series of 5th generation large models, and its common number YA00019027/4698624 is its unified identification in Hitachi's original factory and third-party accessory systems. When ordering, the complete model and serial number of the excavator must be provided for verification to ensure that the installation interface matches the performance parameters perfectly.

This product belongs to the axial piston hydraulic motor specialized for construction machinery, integrating planetary gear reducer and using KYB or similar brand core hydraulic components. The main technical indicators include: rated working pressure ≥ 35 MPa, displacement of about 80-100 cc/rev, maximum output torque ≥ 15 kN · m, and rotation speed 5-12 rpm. The motor housing is made of high-strength cast iron, and the shaft end adopts dual oil seals and dust-proof design. The protection level is IP67, and it can operate for a long time in the oil temperature range of -30 ° C to+100 ° C. It is equipped with overload relief valve and oil replenishment valve internally, supporting bidirectional smooth start stop and buffer braking, and is suitable for the flow requirements of Hitachi HPV112+112 dual pump hydraulic system.

It is recommended to check the tightening torque of the motor installation bolts (usually 200-300 N · m) and the sealing status of the oil pipe joints every 500 working hours. Replace the hydraulic oil filter every 2000 hours of operation and check the cleanliness of the system oil (NAS level 9 or below). Long term overload rotation or emergency stop and start should be avoided in daily life, and the cooling fins of the motor housing should be cleaned regularly under dusty conditions. If there is slow rotation, abnormal noise or oil leakage, the pilot pressure (usually 3.5-4.0 MPa) and the set value of the main safety valve should be checked first; If the motor is internally worn (such as the plunger and port plate), it is recommended to replace it as a whole (YA00019027). After replacement, it is necessary to exhaust the air and test run at low load for 10-15 minutes to confirm that there are no abnormalities before putting it into operation. It is recommended to have a professional hydraulic technician operate and use the original factory specified hydraulic oil (such as HITACHI HLP-V 46).