SK120-6 SK135SR SH120-3 YN15V00015F1 TM40VD Nabtesco TM40 Travel Motor Final Drive Assembly Compatible with Kobelco Sumitomo Kato

1. Product Overview & Wholesale Price Range

The Nabtesco TM40 / TM40VD Travel Motor Final Drive Assembly (OEM Part # YN15V00015F1 / YN15V00015F2 / 18251-11000 / TM40VD) combines both the 2-speed axial piston hydraulic travel motor and the heavy-duty planetary gear reduction box, designed for 12-to-15-ton track excavators operating under continuous muddy crawling, slope climbing, and rough terrain operations.

• Factory Wholesale Price: $1,850 – $3,600 USD (Direct manufacturer pricing — 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

2. Application Worksite Checklist (施工场景清单)

High-torque planetary gears engineered to deliver reliable track driving power across harsh jobsite environments:

• Highway Construction & Earthmoving: High continuous track speed under heavy soil hauling with Kobelco SK135SR short-radius excavators.
• Deep Trenching & Steep Incline Digging: High climbing torque prevents track slipping when traveling up steep ditch slopes on Sumitomo SH120-3 excavators.
• Forestry Land Clearing & Swampy Ground: Floating mechanical seals protect internal planetary gears against mud, water, and tree debris ingress.
• Demolition & Heavy Breaker Operations: Heavy-wall cast iron housing absorbs continuous track impact vibration from rock hammers.

3. Travel Motor Final Drive Troubleshooting & Diagnostic Guide (行走马达常见故障排查)

If your 12–15 ton excavator travel mechanism is exhibiting driving failure, consult the diagnostic guide below:

• Fault 1: Machine Off-Track / Deviating to One Side During Straight Travel (单边行走跑偏)
  Root Cause: Severe volumetric oil bypass across the cylinder block valve plate or worn piston slippers in one travel motor.
  Solution: Replace with a complete drop-in TM40 travel motor assembly (OEM YN15V00015F1) to restore dual-track torque balance.
• Fault 2: Weak Crawling Torque / Unable to Climb Steep Inclines (爬坡无力/行走瘫软)
  Root Cause: Main travel relief valve springs worn out or internal swashplate shoe friction galling.
  Solution: Recalibrate travel relief valve pressure or swap the complete pre-tested TM40 final drive unit.
• Fault 3: Abnormal Metallic Chattering & Grinding Noise From Reduction Gearbox (减速机异响/齿轮打齿)
  Root Cause: Broken teeth on planetary sun gears or severe race pitting on main drive shaft bearings.
  Solution: Inspect final drive oil for metallic filings and install a factory-new TM40 travel gearbox assembly.
• Fault 4: Gear Oil Leakage From Floating Seal / Drive Shaft Area (浮动封/驱动轴封漏油)
  Root Cause: High casing backpressure caused by a clogged motor drain line, or worn mechanical duo-cone floating seal rings.
  Solution: Flush casing drain line and replace with high-pressure duo-cone floating seal group.
• Fault 5: Travel Speed Switching Failure / Locked in Low Speed (高低速无法切换/单速死锁)
  Root Cause: Sticking 2-speed shifting pilot spool or damaged swashplate control piston seals.
  Solution: Clean 2-speed pilot shift valve gallery or replace complete TM40 motor control block.

4. Hot Machinery Replacement Parts Recommendation (5大品类热门推荐表)

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

5. Frequently Asked Questions & Technical Support (QA 问答专区)

Q1: How do I verify if this TM40 travel motor fits my Kobelco SK135SR or Sumitomo SH120-3 excavator?
A: Check your original travel motor tag for OEM part numbers YN15V00015F1, YN15V00015F2, or TM40VD stamp. You can also send us photos of your sprocket bolt holes and oil hose connection pattern for instant verification.

Q2: My Kobelco SK135SR excavator travels off-track to the left side. Will replacing the TM40 motor solve this?
A: Yes, off-track deviation during straight travel is caused by internal volumetric bypass in the weak side travel motor. Installing our new pre-tested TM40 travel motor restores equal dual-track drive torque.

Q3: Is this Nabtesco TM40 travel motor final drive bench tested before shipment?
A: Yes, every single TM40 travel motor undergoes a high-pressure hydraulic bench test verifying high/low speed shifting, gear torque output (up to 320 Bar), and mechanical duo-cone floating seal tightness.