Doosan DX340 Swing Motor Swing Reducer K1004825B
2 month ago
Product details
Doosan DX340 Swing Motor & Swing Reducer
Model No.: K1004825B (JMF‑250)
Detailed Specifications
1. Basic Part Information
· Part Name: Swing Motor & Swing Reducer Assembly
· Doosan Genuine Part Number: K1004825B
· Motor Model: JMF‑250
· Applicable Models: Doosan DX340LC series (including DX340LC‑7, DX340LCA, and other 34‑ton class excavators)
· Primary Supplier: JMF (Korean specialist hydraulic component manufacturer, also a common OE supplier for Doosan)
2. Hydraulic Motor Technical Specifications (JMF‑250)
Item Specification
Motor Type Swash‑plate axial piston motor (with counterbalance valve, relief valve, and anti‑cavitation check valve)
Geometric Displacement 250 cc/rev
Rated Pressure 250 bar (25 MPa)
Maximum Pressure 280 bar (28 MPa)
Rated Speed Approx. 1,500 – 1,600 rpm
Maximum Flow Input Approx. 375 L/min
Brake Type Normally closed multi‑disc brake (hydraulic release)
Brake Release Pressure Approx. 20 – 30 bar
3. Swing Reducer Technical Specifications
Item Specification
Reduction Structure Two‑stage planetary gear reduction
Reduction Ratio 59.27 : 1 (commonly used exact ratio)
Output Shaft Rated Torque Approx. 10,780 N·m (≈ 1,100 kgf·m)
Output Shaft Max. Instantaneous Torque Approx. 18,600 N·m
Rated Output Speed Approx. 12 – 13 rpm
Assembly Dead Weight Approx. 370 – 390 kg
Gear Oil Capacity Approx. 6.5 – 7.5 liters (SAE 80W‑90, API GL‑5 gear oil recommended)
Output Gear Specification Standard module/number of teeth (please verify against the inner teeth of the swing bearing on the actual machine)
4. Structure and Installation Key Points
· Integrated Design: K1004825B is a factory‑assembled motor and reducer unit, already filled with gear oil and sealed/tested for leakage before delivery.
· Port Connections: Includes inlet ports (A/B), tank return port (T), case drain port (L), and brake release port (PG). When replacing, ensure all ports are clean and connected correctly in a one‑to‑one correspondence.
· Common Faults Reference:
· Weak or slipping swing: Check internal motor leakage, relief valve setting pressure, and brake disc wear.
· Reducer abnormal noise / high temperature: Mostly caused by worn planetary gears or bearings, insufficient gear oil, or degraded oil quality.
· Oil leakage: Pay close attention to the motor shaft seal and floating seal.
5. Maintenance and Service Recommendations
· Initial Oil Change: Replace the swing reducer gear oil after the first 500 hours of operation on a new machine; thereafter, replace every 2,000 hours.
· Routine Inspection: Check the gear oil level every 250 hours (via dipstick or sight glass) and examine the magnetic drain plug for excessive metal particles.
· Lubrication: The meshing area between the output shaft pinion and the swing bearing must be regularly greased.
The heart of this assembly (K1004825B) is a high-performance swash-plate axial piston hydraulic motor (model JMF‑250). The high-speed, low-torque output from the motor is fed directly into a two-stage planetary reduction gear box. Through a large reduction ratio of 59.27:1, torque is multiplied and speed is reduced, and the final drive pinion then drives the swing bearing to rotate the upper structure smoothly. Functionally, the overall structure and working logic of this unit are similar to a precision hydraulic winch designed for heavy-duty slewing — it also uses a hydraulic motor as the prime mover, amplifies torque through a planetary gear box, and provides parking brake functionality. The key difference is that instead of paying out or hauling in wire rope, it delivers precise rotary motion of the swing platform.
Similar Video Recommendation
<
>
Bossgoovideo.com Contact Now
If you are interested in the product, contact Bossgoovideo.com for more information
- *To:
- Ningbo Hengnuo Hydraulic Drive Co.,Ltd
- *Message:
-
Submit
Disclaimer :
The information of Bossgoovideo.com limited shown above is provided by the user or collected on the network. Video 2B does not guarantee the authenticity,accuracy and legitimacy of Bossgoovideo.com limited information. Video 2B does not involve legal relationships and disputes between users arising from
transactions other than secured transactions on this website. Disputes shall be settled by you through negotiation.
If you are the person in charge or relevant employee of this enterprise, if you find that the enterprise information is incorrect or want to manage thiscompany, please contact us jacklee1558@gmail.com, after you claim the enterprise, you can obtain management permission, publish supplyand demand information, bring consulting orders, and remove page advertisements.
Suppliers
Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
4 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch ,
hydraulic system