Hydraulic Swing Motor 162-3689 for Caterpillar CAT 320B Excavator The 162-3689 hydraulic swing motor (also recognized as the rotary motor or slewing motor drive) is a core fluid power assembly engineered exclusively for medium-sized tracked excavators. This high-pressure component converts mechanical fluid energy into high-torque rotary movement, controlling the upper carriage rotation with complete precision. Built with hardened steel valve plates, heavy-duty casing, and precision-ground piston groups, it eliminates positional drift and maintains optimal pressure balances during high-cycle swinging and dumping operations. Product Specifications Precision-manufactured to exact dimensional and hydraulic tolerances to guarantee a seamless drop-in installation into heavy crawler machinery chassis networks. Part Number: 162-3689 Alternative Format: 1623689 Product Class: Heavy Equipment Hydraulic Swing Motors & Rotary Group Drives Design Configuration: Fixed Displacement Axial Piston Type System Voltage/Control: Integrated with standard 24V DC solenoid braking valves Cross-Reference & Interchangeable Part Numbers This high-torque swing mechanism corresponds with multiple engineering revisions, factory-remanufactured codes, and alternative manufacturing numbers: 114-1534 / 1141534 (Legacy Production Reference) 114-1544 / 1141544 (Earlier Rotating Group Reference) 204-2795 / 2042795 (Updated Component Interchange) 10R-3011 (Factory Remanufactured Complete Assembly Equivalent) Application and Machinery Compatibility Accurately matched to deliver optimum rotational acceleration and swift structural braking responses for the following heavy equipment series: Compatible Caterpillar (CAT) Excavators 320B Series Crawler Excavators 320B L Series Long Undercarriage Excavators 320B N Series Narrow Tracking Excavators 320C / 320C L Series (Specific Early Production Lines) Associated Powertrain Units Cat 3066T / 3116T Diesel Engine-driven hydraulic configurations Main hydraulic swing reduction planetary gearboxes Installation and Hydraulic System Flushing Notes Technical Recommendation: Catastrophic internal swing motor failures regularly contaminate hydraulic oil lines with microscopic metallic shards. Prior to mounting the replacement 162-3689 rotary motor, completely flush the swing circuit, clean out the primary hydraulic reservoir, and renew all system return and pilot filters. Case pressure settings must be measured at initial startup to ensure immediate lubrication and avoid premature shaft seal blowout. Related Part Numbers NO P.N. NAME 1 92480040 Komatsu 92480040 / 90603140 Travel Gearbox Final Drive for PC4000-6 Mi... 2 2881834 Cummins QST30 Fuel Pump 2881834 2881835 Bosch 0402796212 0402796213 3 594-1623 594-1623 Main Wiring Harness for Caterpillar CAT 374 Excavator 4 600-051-2180 Komatsu Clip 600-051-2180 for D65 WA470-6 GD675 5 368-9171 High Pressure Fuel Pump 368-9171 for Perkins & CAT Heavy-Duty Engi... 6 VOE14636561 Swing Motor VOE14636561 Slewing Assembly fro Volvo EC80 7 HM5X45 LiuGong 9075 906 905 HM5X45 HM5X27 Swing Motor Assembly 8 22L-26-21002 Komatsu PC35 Swing Gearbox 22L-26-21002 Planetary Reduction 9 708-2K-00113 708-2K-00113 Main Hydraulic Pump for Komatsu PC850-8 PC800-8 Excavator 10 21N-38-00080 Komatsu PC1250 PTO Assembly 21N-38-00080 / 21N-38-00082 11 SAA6D125E-5 SAA6D125E-5 Engine Assembly for Komatsu PC400-8 PC450-8 Excavator 12 569-22-71002 Rear Axle Differential Assembly 569-22-71002 for Komatsu HD605-7 Dump ... 13 9286324 Hitachi ZX60-2 ZX60-3 Swing Motor 9286324 Slewing Assembly 14 21T-27-00400 Komatsu PC2000-8 Travel Assembly 21T-27-00400 15 95930840 Komatsu PC3000 PC4000 Swing Motor 95930840 Assembly 16 7835-34-1008 Komatsu Monitor 7835-34-1008 - PC390LC-8M0 Cab Display 17 6204-31-1100 6204-31-1100 Crankshaft for Komatsu S4D95LE-3 PC78MR-6 WA70-7 18 AK5337 AK5337 Flange for Komatsu 830E Mining Truck Front Wheel Rim Assembly 19 254-0786 Caterpillar Turbocharger 254-0786 TURBO GP-BAS for G3516C G3520C G3520... 20 212-8559 Caterpillar Fuel Injection Pump 212-8559 for 3066 Engine 320C 320D 321... 21 4903319 Cummins M11 ISM11 QSM11 Fuel Injector 4903319 4026222 & Fuel Pump ... 22 6245-11-1100 Komatsu Cylinder Head 6245-11-1100 for HD465 HD785 Trucks 23 602-5994 Caterpillar 350GC Swing Motor 602-5994 Drive Assembly 24 6210-81-3122 Komatsu PC1250SP-8R Air Compressor Assembly 6210-81-3122 25 21N-68-32680 Komatsu PC1250-7 Solenoid Valve 21N-68-32680 26 6245-51-9100 Komatsu Oil Pump 6245-51-9100 - SAA6D170E-5C/5A-01/5-B EGR Valve Lubri... 27 708-1W-00882 708-1W-00882 Steering Fan Pump for Komatsu WA380-6 Wheel Loader
