Hitachi ZX120-6 Swing Motor and Planetary Slewing Drive Components Optimize the superstructure rotational performance, torque delivery, and cycle-time efficiency of your medium crawler machinery with premium-grade replacement swing motors designed for the Hitachi ZX120-6 excavator series. Specifically built to process relentless dynamic shock loads during municipal construction, utility trenching, and bulk earthmoving, these high-pressure hydraulic drive groups guarantee continuous field stability and exceptional wear resistance. Applicable Excavator Models and Specifications Compatible Excavators: Hitachi Zaxis ZX120-6, ZX120, ZX135, ZX135US, ZX130-3, ZX135-3, ZAX120-6 Associated Engine Models: Isuzu 4JJ1, Isuzu 4JJ1X Diesel Engines Hitachi ZX120-6 Hydraulic Swing Motor Assembly The high-pressure axial piston swing motor serves as the vital mechanism for managing the 12-ton upper structure turntable’s rotational inertia. Precision-engineered internal barrel configurations, swashplates, and piston guide retainers protect the primary hydraulic network from sudden pressure variations and fluid cavitation during aggressive work cycles. Part Numbers & Technical Cross-References Primary Motor Series Reference: HMS072AG-2UA Interchangeable Production Codes: HMS072AG2UA, 9196961, 9177550, 9262018 Planetary Reduction Gearbox & Internal Maintenance Spares To support high-wear fleet preventative maintenance schedules and facilitate efficient workshop overhauls, a full range of high-tolerance internal components is supported for direct mechanical replacement. Related Service and Repair Elements Rotary Motor Parts: Cylinder blocks, piston shoes, valve plates, set retention plates, and ball guides Slewing Reduction Gears: Output drive pinion shafts, central sun gears, and multi-stage planetary carrier blocks Dynamic Sealing Systems: High-pressure shaft oil seals, heavy-duty casing roller bearings, and complete swing motor seal repair kits Key Technical Advantages Integrated Dynamic Shock Relief: Built-in dynamic cushion and crossover relief valves dampen heavy hydraulic pressure spikes during immediate stopping actions, shielding the primary slewing ring teeth from micro-fractures. Induction-Hardened Gearing Metallurgy: Critical internal sliding surfaces and planetary gear profiles undergo specialized heat treatment to resist premature surface pitting caused by particle-heavy lubricants under high thermal conditions. Direct Drop-In Structural Alignment: Machined precisely to match original factory bolt-hole configurations and output spline structures, enabling an immediate drop-in field installation with zero retrofitting required. Related Part Numbers NO P.N. NAME 1 708-1U-00151 708-1U-00151 Steering Fan Hydraulic Pump for Komatsu WA380-6 Wheel Loa... 2 VOE11886865 Volvo Brake Control Valve VOE11886865 VOE11886053 for BL60 BL61 Backho... 3 6252-41-9100 Komatsu EGR Valve 6252-41-9100 for 6D125E-6 PC490-10 4 95601040 95601040 Main Hydraulic Pump for Komatsu PC4000-6 Mining Excavator 5 172-0916 Caterpillar 3516 Crankshaft 172-0916 128-6788 506-1982 6 9285566 9285566 YB60000770 Main Hydraulic Pump Assembly for Hitachi ZAX130 7 7249380 Fuel Injection Pump 7249380 400912-00219B for Heavy-Duty Diesel Engine... 8 219-2622 Caterpillar D6R Transmission Assembly 219-2622 315-9959 180-3431 for D... 9 21N-68-32680 Komatsu PC1250-7 Solenoid Valve 21N-68-32680 10 468-5121 Caterpillar C18 Tier 4 Final Crankshaft 468-5121 4685121 11 6245-11-5500 6245-11-5500 muffler for SAA6D170E-5CR-W engine for Komatsu PC1250SP-8... 12 708-1S-00240 708-1S-00240 Hydraulic Pump Assembly for Komatsu D65-12 D65-15 D275-5D... 13 720-2L-00021 720-2L-00021 Main Hydraulic Pump Assembly for Komatsu D51 14 2096348 Wirtgen Clutch Insert Assembly 2096348 for W195 W200 W210 W215 W250 Co... 15 21T-70-33131 Komatsu Connecting Rod Shim 21T-70-33131 21N-70-33221 for PC1250 PC200... 16 708-2L-00760 708-2L-00760 HPV165 Main Hydraulic Pump for Komatsu PC750-8 PC800-8 17 3417674 Cummins 3417674 Fuel Injection Pump for N14 / M11 / ISM11 Engine Serie... 18 7831-68-9000 Komatsu Panel 7831-68-9000 for D155 D375 bulldozers dozers 19 561-30-91104 Komatsu 561-30-91104 561-30-81101 Rim Assembly for HD465 HD785 20 708-2L-41230 708-2L-41230 Main Hydraulic Pump for Komatsu PC200-8K 21 702-16-02190 Komatsu HD785-7 HM300 Control Lever assembly 702-16-02190 22 183-0691 Caterpillar Fuel Injector BN1830691C1 183-0691 for 3126 3126B C7 Engin... 23 374-2640 Caterpillar C7.1 Engine ECM Controller 374-2640 for 320D2 323D2 329D2 ... 24 130-6381 130-6381 Ripper Tilt Hydraulic Cylinder LH for Caterpillar D11T D11R 25 21N-38-00080 Komatsu PC1250 PTO Assembly 21N-38-00080 / 21N-38-00082
