中文
Welcome to Guangzhou HanRui Hydraulic Co., Ltd. We specialize in providing the complete K7SP36 / K7SP36B excavator hydraulic main pump assembly and spare parts repair kit (including cylinder blocks, piston shoes, valve plates, swashplate assemblies, drive shafts, and high-pressure seal kits), precision-manufactured as heavy-duty aftermarket replacement parts compatible with Kawasaki, Hyundai, Doosan, and Yanmar engineering machinery equipment. Located in Guangzhou Tianhe Engineering Machinery Business Circle, we supply OEM-quality hydraulic components directly to global clients at factory-wholesale prices.
Heavy-Duty Application & Working Scenarios
Engineered to withstand compact excavator digging cycles and continuous high-pressure hydraulic output:
- Urban Trenching & Foundation Excavation: Micro-lapped bronze valve plates and alloy pistons maintain peak flow efficiency under 24.5 MPa working pressure.
- Continuous Landscaping & Earthmoving: High volumetric efficiency guarantees rapid boom hoist and bucket stroke compound movements for 5-6 ton excavators.
- Hydraulic Breaker Operations: Heavy-duty swashplates and cradle bearings absorb violent hydraulic shock spikes from breaker attachments.
- Fleet Overhaul & Remanufacturing: Complete packaged overhaul kits enable fast, cost-effective on-site main pump rebuilding for mini excavators.
K7SP36 Hydraulic Main Pump Fault Diagnosis & Troubleshooting
Experiencing main pump performance loss or operational sluggishness? Over 90% of field repair searches involve internal pump wear. Here is how our K7SP36 Spare Parts & Overhaul Kit resolves them:
1. Engine Stalling / Overloading Under Heavy Load (控泵熄火 / 闷车)
Symptom: Engine bogs down or stalls completely when pulling heavy digging loads or raising the boom.
Cause: Sticking pump regulators, worn swashplate cradle bearings, or damaged servo pistons failing to reduce pump displacement.
Solution: Replacing worn K7SP36 swashplate cradles and servo tilt pins restores accurate displacement control and prevents engine stalling.
2. System Pressure Drop & Weak Digging Force (系统掉压 / 工作无力)
Symptom: Slow attachment speeds, weak bucket break-out force, and speed fade as hydraulic oil temperature rises.
Cause: Micro-abrasion scoring on cylinder block faces, spherical bushes, or valve plates causing internal fluid bypass.
Solution: Precision-milled K7SP36 cylinder blocks and spherical valve plates eliminate inner slippage and rebuild full operating pressure.
3. Hydraulic Oil Leakage at Main Shaft & Housing (主泵漏油)
Symptom: Hydraulic fluid leaking around the front drive shaft oil seal or intermediate housing mating joints.
Cause: Shaft seal journal grooving wear or seal lip hardening caused by high case drain backpressure and oil heat.
Solution: Induction-hardened drive shafts combined with premium NOK high-pressure shaft seals stop oil leaks completely.
4. Pump Cavitation Noise & Severe Vibration (泵体异响 / 抖动)
Symptom: High-pitched whining noise or heavy hydraulic hose shuddering during pump rotation.
Cause: Worn piston shoe heads, damaged drive shaft splines, or loose cylinder block center pin supports.
Solution: Precision-matched piston shoes and center pin press assemblies restore smooth, vibration-free hydraulic rotation.
5. Hydraulic Oil Overheating & Thermal Fade (主泵发热高温)
Symptom: Hydraulic tank oil temperature spikes rapidly after 30 minutes of continuous machine operation.
Cause: High fluid friction and severe internal pressure recirculating bypass within worn rotary group components.
Solution: Installing a complete new K7SP36 rotary group overhaul kit minimizes internal friction and operational oil heat.
Hot Popular Excavator Hydraulic Main Pumps & Spare Parts Catalog
Explore our factory-direct aftermarket catalog for major construction equipment brands:
| Machine Model (型号) | Part Number (零件号) | Component Name (品名) | Compatible Brand (适配品牌) | Target Fault Solved |
|---|---|---|---|---|
| R55-7 / R60-7 / DX60 | K7SP36 / K7SP36B Kit | Main Pump Overhaul Repair Kit | Compatible with Hyundai / Doosan / Kawasaki | Fixes Engine Stalling & Low Pressure Loss |
| SK200-8 / SK210-8 / R215-7 | K5V80 / K5V80DT Kit | Main Pump Overhaul Repair Kit | Compatible with Kobelco / Kawasaki | Fixes Engine Stalling & Low Pressure Loss |
| Cat 336GC / 336E | 509-5142 / K5V160DTP | Hydraulic Main Pump Assembly | Compatible with Caterpillar | Fixes Low Digging Pressure & Oil Leakage |
| EX200-5 / EX200-6 / ZX200 | HPV0102 / HPV102 Parts Kit | Main Pump Overhaul Repair Kit | Compatible with Hitachi | Fixes Casing Leakage & Bearing Seat Wear |
| PC300-8 / PC350-8 | 708-2G-00020 / HPV160 | Hydraulic Main Piston Pump Parts | Compatible with Komatsu | Fixes Slow Movement & Pump Noise |
Frequently Asked Questions (Troubleshooting & Fitment)
Q: What is the price range for a K7SP36 / K7SP36B hydraulic pump repair kit?
A: Direct from our Guangzhou factory, the wholesale price range for a complete K7SP36 / K7SP36B Hydraulic Main Pump Repair Kit (rotary group overhaul set) is $150.00 – $480.00 USD per set, depending on components included (piston shoes, cylinder block, valve plate, swashplate, shafts). Purchasing directly saves 30% to 50% compared to local OEM dealer prices.
Q: Which mini excavator models use the Kawasaki K7SP36 / K7SP36B hydraulic pump?
A: The K7SP36 / K7SP36B hydraulic main pump is widely used on 5-to-8-ton mini and midi excavators, including Hyundai R55-7, R60-7, Doosan DX60, DH60-7, SANY SY60, and Yanmar mini excavators.
Q: What main parts are included in a full K7SP36 pump overhaul kit?
A: A complete K7SP36 overhaul kit includes: Cylinder Block, Piston Shoes, Valve Plate (Right or Left), Swashplate Assembly, Spherical Bushes, Center Pins, Drive Shafts, Bearings, and a High-Pressure Seal Kit.
