SK330-8 SK350-8 YN15V00018F1 MSF340VP KYB MSF340VP Hydraulic Motor Repair Kit Compatible with Kobelco Sumitomo Kato

1. Product Overview & Wholesale Price Range

The KYB MSF340VP Hydraulic Motor Repair Kit (OEM Part # YN15V00018F1 / YN15V00021F1 / MSF340VP / MSF-340VP) contains a complete precision rotary group overhaul set including cylinder block, piston shoes with bronze slippers, distributor valve plate, retainer plate, drive shaft, and swashplate built for 30-to-35-ton heavy hydraulic excavators.

• Factory Wholesale Price: $480 – $980 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• Included Spare Parts: Cylinder Block (1pc) + Piston Shoes (9pcs) + Valve Plate (1pc) + Retainer Plate (1pc) + Ball Guide (1pc) + Swash Plate (1pc) + Drive Shaft (1pc)
• 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 dispatch)
• Warranty: 12 Months full replacement warranty with high-lead bimetallic alloy durability guarantee

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

Precision-ground surfaces engineered to withstand severe torque spikes under heavy mining conditions:

• Heavy Open-Pit Mining & Quarrying: Restores maximum rotation torque during continuous rock truck loading with Kobelco SK350-8 excavators.
• Deep Rock Excavation & Foundation Digging: Bimetallic valve plates prevent internal oil bypass during high-temperature continuous digging cycles.
• Highway Infrastructure & Earthmoving: High volumetric efficiency ensures steady travel and swing power matching under heavy clay loading.
• Building Demolition & Heavy Breaker Crushing: Forged alloy steel components absorb severe hydraulic pressure shockwaves from heavy shear attachments.

3. Hydraulic Motor Overhaul & Diagnostic Guide (马达配件常见故障排查)

If your 30–35 ton excavator travel or swing motor is experiencing hydraulic degradation, check the diagnostic symptoms below:

• Fault 1: Motor Weakness & Torque Drop Under Heavy Mining Load (马达无力/旋转掉压)
  Root Cause: Micro-cracks or excessive clearance wear between the cylinder block face and valve plate surface causing internal oil bypass.
  Solution: Install our precision lapped MSF340VP cylinder block and valve plate kit (OEM YN15V00018F1) to restore 100% working pressure.
• Fault 2: Severe Shaking or Abnormal Knocking Noise From Motor Housing (马达抖动异响)
  Root Cause: Worn ball guide retainer plate or loose piston slipper heads on the swashplate.
  Solution: Replace with a complete MSF340VP rotary group kit including new ball guide and piston shoes.
• Fault 3: Black Copper Debris Found in Hydraulic Return Oil Filter (油箱内有铜粉黑屑)
  Root Cause: High-temperature friction melting of the bronze layer on the piston slipper shoes.
  Solution: Flush the entire hydraulic oil circuit, clean control valves, and rebuild motor with high-copper alloy MSF340VP pistons.
• Fault 4: Slow Motor Speed & Thermal Overheating After 1 Hour (热车发慢高温)
  Root Cause: Thermal expansion gap expansion on scored valve plate distributor faces.
  Solution: Replace with new bimetallic MSF340VP valve plate and cylinder 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 MSF340VP repair kit fits my Kobelco SK350-8 excavator motor?
A: Check your original hydraulic motor tag for OEM numbers YN15V00018F1 or MSF340VP stamp. You can also send us clear photos of your old cylinder block and piston slippers for instant fitment check.

Q2: What is the alloy composition of the MSF340VP piston shoe slippers?
A: Our MSF340VP piston shoes feature high-density forged steel bodies with high-lead bimetallic bronze slippers, heat-treated for extreme durability under 350 Bar peak pressure.

Q3: Is this MSF340VP kit a complete overhaul solution for hydraulic motor rebuilds?
A: Yes, it includes all major internal wear components (cylinder block, 9 pistons, valve plate, retainer plate, ball guide, swashplate, and drive shaft) needed for a complete motor rebuild.