DH220-5 R210-7 EC210B 31N6-40011 14528281 TM40 TM40VC Final Drive Travel Motor Assembly Compatible with Doosan Hyundai VOL

The TM40 / TM40VC / TM40VD Final Drive Travel Motor Assembly (OEM Part # 31N6-40011 / 31N6-40050 / 14528281 / 2401-9188) is an integrated 2-speed axial piston hydraulic travel motor combined with a heavy-duty 2-stage planetary reduction gearbox, engineered for 20-to-24-ton tracked excavators.

• Factory Wholesale Price: $1,800 – $3,500 USD (Direct manufacturer supply — Save up to 50% vs regional dealer markups)
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for batch container orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with 100% bench pressure test video proof

Engineered with high torque reduction gearboxes to deliver powerful track traction under extreme ground conditions:

• Heavy Mining & Quarry Loading: High driving torque output for navigating steep rocky inclines and muddy quarry haul roads with Doosan DH220-5 machines.
• Swamp Land Reclamation & Muddy Soil: Sealed heavy-duty main floating seals prevent water, silt, and sand ingress during wetland excavation.
• Demolition & Heavy Debris Navigation: Reinforced ductile iron casing absorbs high shock loads from uneven concrete debris and rubble.
• Long-Distance Site Travel & Grading: Built-in 2-speed automatic speed changeover mechanism ensures fast jobsite relocation without overheating.

If your 20–24 ton excavator is experiencing track travel failure, consult the diagnostic guide below:

• Fault 1: Single Side Track Walking Weak or Machine Pulling to One Side (单边行走无力/掉速跑偏)
  Root Cause: Severe wear on the travel motor valve plate face or internal high-pressure oil bypass across cylinder pistons.
  Solution: Replace worn motor rotary group components or install a complete drop-in TM40 travel motor assembly (OEM 31N6-40011).
• Fault 2: Travel Gearbox Locked Up, Cracking Noise, or Metal Crunching (行走卡死/抖动异响)
  Root Cause: Planetary gear teeth breakage, needle bearing disintegration, or lack of gear oil causing gear tooth galling.
  Solution: Inspect reduction planetary gears and replace complete gearbox reduction section immediately.
• Fault 3: Hydraulic Oil Leakage at Sprocket Floating Seal or Drive Shaft (行走马达/浮动封漏油)
  Root Cause: Damaged floating seal rings caused by mud ingress, or aged high-pressure shaft seal from clogged drain lines.
  Solution: Replace floating seal group, clear travel drain circuit line, and refill clean 90# gear oil.
• Fault 4: High/Low 2-Speed Travel Mode Fails to Changeover (高低速无法切换/无法加挡)
  Root Cause: 2-speed changover valve spool jammed by hydraulic oil sludge or pilot solenoid valve electrical fault.
  Solution: Clean 2-speed control valve spool and check pilot line pressure (20–70 Bar).
• Fault 5: Final Drive Reduction Gearbox Overheating & Burning Oil Smell (减速机发烫油温过高)
  Root Cause: Insufficient planetary gear oil level or excessive friction between worn swashplate thrust bearings.
  Solution: Check gear oil level, flush motor casing, and replace worn travel motor section.

Explore our factory-direct replacement hydraulic components compatible with major global excavator brands:

Q1: How do I verify if this TM40 final drive travel motor fits my Doosan DH220-5 excavator?
A: Check your original travel motor nameplate for model TM40, TM40VC, or OEM part number 31N6-40011. You can also measure the sprocket bolt hole count and frame mounting diameter for 100% confirmation.

Q2: Does this TM40 travel motor come complete with gear oil ready to install?
A: Yes, our TM40 final drive motor comes 100% pre-assembled with hydraulic motor, 2-speed valve, and planetary gearbox filled with fresh gear oil for plug-and-play installation.

Q3: My VOL EC210B excavator travels slowly on one side. Will replacing the TM40 motor solve this?
A: Yes, single-track speed loss is caused by internal pressure bypass in the worn travel motor. Installing our complete TM40 final drive restores equal track travel speed and driving power.