SK120-5 SK135SR SH120-3 M5X80 YN15V00001F1 Kawasaki M5X80 Slewing Swing Motor Repair Kit Compatible with Kobelco Sumitomo Kato Hyundai

1. Product Overview & Wholesale Price Range

The Kawasaki M5X80 Slewing Swing Motor Repair Kit (OEM Part # M5X80 / M5X80CHB / YN15V00001F1 / 18251-09000) includes the complete internal rotary group overhaul set: cylinder block, piston shoes with bronze slippers, distributor valve plate, retainer plate, ball guide, swash plate cradle, drive shaft, and brake discs designed for 12-to-15-ton excavators undergoing swing motor overhauls.

• Factory Wholesale Price: $280 – $580 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• Included Core Spare Parts: Cylinder Block (1pc) + Piston Shoes (9pcs) + Valve Plate (1pc) + Retainer Plate (1pc) + Ball Guide (1pc) + Swash Plate (1pc) + Brake Discs Set
• MOQ & Bulk Discount: 1 Set (Tiered wholesale discounts available for hydraulic repair shop batch orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with high-lead bimetallic bronze durability guarantee

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

Engineered to restore original rotation torque and smooth swing control across demanding 12-15 ton excavator jobsites:

• Urban Infrastructure & Utility Trenching: Micro-lapped valve faces ensure precise 360-degree positioning control during pipe laying with Kobelco SK135SR excavators.
• Highway Repair & Earthmoving: Restores maximum swing torque during continuous bucket loading cycles on Sumitomo SH120-3 excavators.
• Forestry Land Clearing & Agriculture Drainage: High thermal resistance bimetallic plates prevent swing power loss during continuous long-hour digging.
• Demolition & Concrete Breaker Operations: Forged alloy steel pistons absorb continuous side-impact shocks from rock breakers.

3. Slewing Swing Motor Overhaul & Fault Diagnostic Guide (维修包常见故障排查)

If your 12–15 ton excavator swing mechanism is exhibiting performance degradation, check the wear symptoms below:

• Fault 1: Thermal Swing Pressure Loss & Rotation Slowdown After 1 Hour (热车回转掉压发慢/内泄)
  Root Cause: Wear gap between the cylinder block face and distributor valve plate surface causing internal high-pressure thermal oil bypass.
  Solution: Replace the worn rotary group with our precision lapped M5X80 cylinder block and valve plate kit (OEM YN15V00001F1).
• Fault 2: Swing Drift / Auto-Slewing Slip When Parked on an Incline (斜坡停车自动溜车)
  Root Cause: Mechanical parking brake disc wear or score marks on the swashplate cradle pivot.
  Solution: Install our M5X80 overhaul kit with new friction brake discs and swashplate group to restore firm holding torque.
• Fault 3: Severe Shaking, Jerking or Metallic Noise During Swing (回转抖动卡顿异响)
  Root Cause: Loose piston slipper heads, broken retainer plate spring, or worn ball guide.
  Solution: Replace retainer plate, ball guide, and piston shoe set to eliminate mechanical play and chatter.
• Fault 4: Black Copper Filings Found in Hydraulic Return Oil Filter (油箱内有黑粉铜屑)
  Root Cause: Friction galling and thermal melting of the bronze layer on the piston slippers under high pressure.
  Solution: Flush the entire hydraulic oil circuit, clean control valves, and rebuild motor with high-lead bronze M5X80 pistons.

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 M5X80 repair kit fits my Kobelco SK135SR or Sumitomo SH120-3 swing motor?
A: Check your original swing motor tag for OEM part numbers M5X80, M5X80CHB, or YN15V00001F1. You can also send us clear photos of your old cylinder block and piston slippers for instant fitment verification.

Q2: What is the material hardness of the M5X80 cylinder block and piston slippers?
A: Our M5X80 cylinder blocks are made of high-density forged alloy steel with bimetallic copper-alloy distribution faces, and the piston shoes feature high-lead bronze slippers rated for continuous 320 Bar working pressure.

Q3: Is this M5X80 repair kit a complete overhaul solution for swing motor rebuilds?
A: Yes, it includes all major internal wear components (cylinder block, 9 pistons, valve plate, retainer plate, ball guide, swashplate, and friction brake discs) required for a complete motor rebuild.