PC30-7 PC35MR TB135 K3SP36C 708-3S-00030 KYB K3SP36C Hydraulic Pump Assembly Compatible with Komatsu Takeuchi Sany LiuGong

The KYB K3SP36C Hydraulic Pump Assembly (OEM Part # 708-3S-00030 / 708-3S-00040 / 19010-21300 / K3SP36) is a compact hydraulic piston/gear combination pump designed for 1.5-to-3.5-ton mini excavators operating under urban trenching, landscaping, and residential digging works.

• Factory Wholesale Price: $750 – $1,600 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 test video proof

Precision-matched flow displacement engineered to deliver smooth hydraulic action in tight spaces:

• Urban Pipe Trenching & Cable Installation: Fine hydraulic control for narrow ditch excavation with Komatsu PC30-7 and PC35MR mini excavators.
• Residential Foundation & Backfilling: Consistent working pressure during basement digging and site leveling with Takeuchi TB135 excavators.
• Agricultural Drainage & Orchard Maintenance: Smooth oil flow for fence pole digging and garden landscaping with Sany SY35U and LiuGong 903.5 machines.
• Small Building Renolition & Concrete Patching: Compact pump casing protects against pressure pulsation caused by hydraulic breaker attachments.

If your 1.5–3.5 ton mini excavator is exhibiting hydraulic system failure, consult the diagnostic guide below:

• Fault 1: Cold Machine Operates Normally, But Machine Slows Down & Drops Pressure After 1 Hour (冷车正常,热车掉压发慢)
  Root Cause: Thermal expansion wear gap inside the cylinder block and valve plate, causing internal high-pressure oil thermal bypass.
  Solution: Replace with a complete drop-in K3SP36C hydraulic pump assembly (OEM 708-3S-00030) or overhaul the internal rotary kit.
• Fault 2: Engine Stalls or Overloads When Actuating Hydraulic Boom/Arm (憋车/发动机过载熄火)
  Root Cause: K3SP36C pump regulator control spool jammed or pilot pressure relief valve miscalibrated.
  Solution: Recalibrate pump regulator pilot pressure or replace the complete regulator assembly to restore engine horsepower matching.
• Fault 3: Hydraulic Oil Leakage From Drive Shaft Seal Area (主驱动轴封高压串油漏油)
  Root Cause: Clogged casing drain line causing excessive internal housing backpressure, blowing out the drive shaft skeleton seal.
  Solution: Flush housing drain lines, replace front drive shaft seal, and check gear pilot pump relief pressure.
• Fault 4: Abnormal Cavitation Noise or Severe Vibration From Main Pump (泵体异响抖动/气蚀)
  Root Cause: Air suction at inlet suction pipe, contaminated hydraulic tank filter, or worn drive shaft bearings.
  Solution: Replace suction line seals, flush hydraulic fluid tank, and replace drive shaft roller bearings.
• Fault 5: Black Metallic Filings Found Inside Hydraulic Tank Filter (油箱内有黑粉或金属屑)
  Root Cause: Severe friction galling on swashplate bronze layer or cylinder block face failure.
  Solution: Flush entire hydraulic piping system, clean main control valve, and install a new K3SP36C main pump assembly.

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

Q1: How do I verify if this KYB K3SP36C pump fits my Komatsu PC35MR or Takeuchi TB135 excavator?
A: Check your original pump nameplate for OEM numbers 708-3S-00030, 19010-21300, or K3SP36C stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My Komatsu PC30 excavator stalls the engine when lifting the boom. Will replacing the K3SP36C pump solve this?
A: Yes, engine stalling is usually caused by a sticking pump regulator valve failing to de-stroke under load. Installing our pre-calibrated K3SP36C pump restores smooth engine power matching.

Q3: Is this KYB K3SP36C hydraulic pump bench tested before shipment?
A: Yes, every single K3SP36C pump undergoes a 5-step factory bench test, verifying pressure up to 250 Bar and volumetric efficiency above 95%. A live test video is provided before shipping.