PC120-6 PC130-6 4D102 708-1W-00020 HPV75 Hydraulic Main Pump Repair Kit Compatible with Komatsu
1. Product Overview & Wholesale Price Range
The Komatsu PC120-6 HPV75 Hydraulic Main Pump Repair Kit (OEM Part # 708-1W-00020 / 708-1W-00010 / HPV75) includes the complete internal rotary group: cylinder block, piston shoes, distributor valve plate (RH/LH), retainer plate, ball guide, and swash plate built for 12-to-13-ton excavators undergoing main pump overhauls.
- Factory Wholesale Price: $320 – $750 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)
- 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 hydraulic working pressure across demanding mid-size excavator jobsites:
- Urban Pipe Trenching & Utility Laying: Restores smooth hydraulic power matching for ditch excavation with Komatsu PC120-6 excavators.
- Highway Infrastructure & Earthmoving: High thermal resistance bimetallic plates prevent power loss during continuous long-hour digging.
- Agricultural Drainage & Land Clearing: Precision lapped cylinder faces ensure zero internal oil bypass under high ambient temperatures.
- Small Demolition & Hammer Breaking: Case-hardened steel pistons withstand continuous high hydraulic pressure spikes.
3. Hydraulic Pump Overhaul & Fault Diagnostic Guide (维修包常见故障排查)
If your Komatsu PC120-6 excavator main pump is exhibiting performance degradation, check the wear symptoms below:
- Fault 1: Thermal Pressure Loss & Machine Slowdown After 1 Hour (热车掉压发慢/内泄)
Root Cause: Wear gap between the cylinder block face and valve plate surface causing internal high-pressure thermal oil bypass.
Solution: Replace the worn rotary group with our precision lapped HPV75 cylinder block and valve plate kit (OEM 708-1W-00020). - Fault 2: Engine Stalls or Lacks Digging Force Under Heavy Bucket Load (憋车熄火/无力)
Root Cause: Scoring on piston shoe brass slippers or stickiness in the swashplate cradle pivot.
Solution: Install new HPV75 copper-coated piston shoes and swashplate group to restore smooth stroke control. - Fault 3: Black Copper Filings Found in Hydraulic Tank 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.
Solution: Flush the entire hydraulic oil system, clean main control valve, and rebuild pump with a new HPV75 repair kit. - Fault 4: Abnormal Pulsation Noise & Chattering From Pump Housing (泵体异响/震动)
Root Cause: Broken retainer plate spring, worn ball guide, or pitted swashplate surface.
Solution: Replace ball guide, retainer plate, and swashplate assembly to eliminate mechanical chatter.
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:
| Category (品类) | Machine Model (适用型号) | OEM Part Number (零件号) | Compatibility (适配品牌) |
|---|---|---|---|
| Hydraulic Pump Repair Kit | PC120-6 / PC130-6 / 4D102 | 708-1W-00020 / HPV75 | Compatible with Komatsu |
| Hydraulic Pump Repair Kit | PC60-5 / PC60-6 / PC60-7 | 708-1W-00030 / HPV35 | Compatible with Komatsu |
| Hydraulic Pump Repair Kit | SK330-8 / SK350-8 | YN15V00018F1 / MSF340VP | Compatible with Kobelco |
| Hydraulic Main Pump | EX120-5 / EX130-5 | 4372038 / HPV091DS | Compatible with Hitachi |
| Hydraulic Main Pump | CAT 320C / 320D | 200-3269 / SBS120 | Compatible with Cat-erpillar |
| Slewing Motor Assembly | SK120-5 / SH120 | YN15V00001F1 / MSG-85P | Compatible with Kobelco Sumitomo |
| Diesel Engine Assembly | EX120-5 / ZX120 | 8-97100-388-0 / 4BG1T | Compatible with Isuzu Hitachi |
5. Frequently Asked Questions & Technical Support (QA 问答专区)
Q1: How do I verify if this HPV75 repair kit fits my Komatsu PC120-6 excavator main pump?
A: Check your original pump nameplate for OEM part numbers 708-1W-00020, 708-1W-00010, or HPV75 stamp. You can also send us photos of your old cylinder block and pistons for instant verification.
Q2: What is the material composition of the HPV75 cylinder block and piston slippers?
A: Our HPV75 cylinder blocks are made of high-density alloy steel with bimetallic copper-alloy distribution faces, and the piston shoes feature high-lead bronze slippers rated for continuous 320 Bar pressure.
Q3: Is this HPV75 repair kit a complete drop-in overhaul solution?
A: Yes, the kit includes all major internal wear components (cylinder, 9 pistons, valve plate, retainer plate, ball guide, and swashplate) required for a complete pump rebuild.
