Komatsu PC300-7 HPV140 Main Pump: Complete Specifications, Features & Buying Guide (2026)
Author
JERY WANG
Guangzhou Rito Hydraulic Co.,Ltd., located in Guangzhou, China, is a leading manufacturer and distributor of hydraulic pumps, final drives, swing motors, and main control valves for earthmoving machinery. We supply genuine, OEM, and high-quality aftermarket parts.
We are committed to continuously sharing our expertise regarding construction machinery and excavator hydraulic systems. Our goal is to help you gain a deeper understanding of equipment principles and applications—enabling you to work more efficiently—while also showcasing our professional knowledge and capabilities. We invite you to learn more about us.
Choose us, and you will enjoy the best service, the most favorable prices, and the most reliable supplier!
Marie R. Winters
Quick Answer
Key Takeaways
- The HPV140 is the main hydraulic pump of the Komatsu PC300-7, a 31-ton-class excavator with the SAA6D114E engine (approx. 31,200 kg operating weight, approx. 1.4 m3 bucket).
- It is a variable-displacement piston pump of approx. 140 cc/rev - the Komatsu HPV140 belongs to the same pump family as the Kawasaki K3V140.
- RITO HYDRAULIC's HPV140 features variable piston structure, precision friction-pair reinforcement and high volumetric efficiency for long service life.
- The pump weighs approx. 270 kg with packing of approx. 60 x 63 x 83 cm - plan sea freight accordingly.
- Typical failure signs: weak boom/arm action, slow or jerky movements, abnormal noise, overheating, or low hydraulic pressure.
- Before ordering, confirm your machine serial number, the old pump's part number, and whether you need a single pump or complete assembly.
Table of Contents
- Introduction: The PC300-7 and Its Main Pump
- Komatsu PC300-7 Excavator Key Specifications
- HPV140 Main Pump Specifications
- HPV140 vs K3V140 vs Other Main Pumps: Comparison Table
- RITO HYDRAULIC PC300-7 HPV140 Main Pump: Key Features
- Common Main Pump Problems & Symptoms
- Main Pump Maintenance & Service Tips
- Buying Guide: What to Check Before Buying
- Real-World Case Study: HPV140 Supply for PC300-7 (Export Project)
- FAQ - HPV140 Main Pump
- Conclusion: Get the Right HPV140 for Your Machine
1. Introduction: The PC300-7 and Its Main Pump
- Position: the PC300-7 is Komatsu's proven 31-ton-class excavator, widely used in mining, construction and earthmoving.
- Hydraulic heart: the main pump (HPV140) delivers oil flow and pressure to the boom, arm, bucket, swing and travel circuits - the component that powers every working action.
- Why it matters: a worn main pump means weak digging force, slow cycle times and high fuel consumption; replacement quality decides how long the machine keeps working.
- This guide combines verified specifications with hands-on export experience supplying PC300-7 HPV140 main pumps.
2. Komatsu PC300-7 Excavator Key Specifications
| Parameter | Value |
|---|---|
| Machine Class | 31-ton-class hydraulic excavator |
| Engine | Komatsu SAA6D114E |
| Operating Weight | approx. 31,200 kg (68,800 lb) |
| Bucket Capacity | approx. 1.4 m3 |
| Main Pump | HPV140 (Kawasaki K3V140 family) |
| Typical Applications | Mining, construction, earthmoving |
- Specifications vary by configuration and market - confirm with the official Komatsu specification sheet for your machine serial number.
3. HPV140 Main Pump Specifications
| Parameter | Value |
|---|---|
| Model | HPV140 (Komatsu designation; Kawasaki K3V140 family) |
| Type | Variable-displacement swash-plate piston pump |
| Displacement | approx. 140 cc/rev |
| Max Pressure | approx. 350 bar (varies by machine setting) |
| Weight | approx. 270 kg |
| Packing Size | approx. 60 x 63 x 83 cm |
| Typical Machines | Komatsu PC300-7 (PC300-6 / PC360-7 per aftermarket fit) |
- HPV140 and K3V140 are the Komatsu and Kawasaki designations of the same pump family; confirm the exact version with your machine's part number.
4. HPV140 vs K3V140 vs Other Main Pumps: Comparison Table
| Pump Model | Displacement | Max Pressure | Typical Application |
|---|---|---|---|
| HPV140 (K3V140) | approx. 140 cc/rev | approx. 350 bar | 30-ton class (Komatsu PC300-7) |
| K3V112 | approx. 112 cc/rev | approx. 350 bar | 20-22 ton class excavators |
| K3V180 | approx. 180 cc/rev | approx. 350 bar | 40-ton class excavators |
- Choose by machine size: displacement grows with machine class - matching the wrong pump means wrong flow and pressure for the machine.
5. RITO HYDRAULIC PC300-7 HPV140 Main Pump: Key Features
- Variable Piston Structure: stable output flow with rapid compound-action response - smooth, powerful simultaneous boom, arm and bucket movements.
- Precision Friction Pair Reinforcement: wear- and impact-resistant construction for a longer service life in mining duty.
- High Volumetric Efficiency: low hydraulic loss, energy saving and reduced emissions.
- Complete unit: supplied as a tested main pump with export packing (approx. 270 kg / 60 x 63 x 83 cm), ready for PC300-7 installation.
6. Common Main Pump Problems & Symptoms
- Weak digging force / slow boom: worn pistons, slippers or port plate inside the pump - the classic main pump failure.
- Jerky or slow compound actions: reduced flow due to worn swash plate or control valve issues.
- Abnormal noise (whining/growling): cavitation, low oil level, blocked suction filter, or worn bearings.
- Overheating: internal leakage raises oil temperature; check relief valve settings and oil cooler.
- Low system pressure: check pressure settings first, then the pump's internal condition.
- Quick diagnosis: oil level and condition, suction filter, main relief pressure, then pump flow test.
7. Main Pump Maintenance & Service Tips
- Keep hydraulic oil clean - contamination is the number-one killer of piston pumps; change oil and filters per the Komatsu schedule.
- Check suction filters and breathers regularly; a blocked suction line causes cavitation damage.
- Monitor operating temperature and pressure; sudden changes signal internal wear.
- Do not run the machine with low oil level - pump starvation destroys the friction pairs quickly.
- When the pump shows early wear signs, repair or replace early before debris damages the whole hydraulic system.
8. Buying Guide: What to Check Before Buying
- Machine identity: PC300-7 model year and machine serial number (S/N).
- Part number: the Komatsu part number on the old pump nameplate - match it exactly.
- Unit type: single pump vs complete assembly; confirm mounting, ports and control configuration.
- Quality tier: genuine / OEM / aftermarket / rebuilt with warranty terms; ask for the test report where available.
- Logistics: the pump weighs approx. 270 kg (packing 60 x 63 x 83 cm) - sea freight is usually the economical choice; confirm Incoterms and lead time.
9. Real-World Case Study: HPV140 Supply for PC300-7 (Export Project)
RITO HYDRAULIC supplies the PC300-7 HPV140 main pump with a variable piston structure (stable output flow, rapid compound-action response), precision friction-pair reinforcement (wear- and impact-resistant, longer service life) and high volumetric efficiency (low hydraulic loss, energy saving). The unit is export-packed at approx. 270 kg / 60 x 63 x 83 cm.
Based on our export experience, buyers should confirm the following before ordering an HPV140:
- Machine serial number (S/N) and model year of the PC300-7.
- The Komatsu part number on the old pump for exact matching.
- Single pump or complete assembly, and control/mounting configuration.
- Quality tier and warranty terms; ask for the test report where available.
- Freight plan based on the 270 kg weight; payment terms and lead time.
10. FAQ - HPV140 Main Pump
1. What excavators use the HPV140 main pump?
The HPV140 is the main pump for the Komatsu PC300-7, a 31-ton-class excavator; per aftermarket fitment it also covers PC300-6 and PC360-7 applications. Confirm with your machine serial number and old part number.
2. What is the displacement of the HPV140 pump?
The HPV140 is a variable-displacement piston pump of approx. 140 cc/rev, operating at approx. 350 bar (depending on machine setting).
3. Is HPV140 the same as K3V140?
HPV140 is the Komatsu designation and K3V140 the Kawasaki designation of the same pump family - they are commonly treated as interchangeable in the aftermarket. Always verify by part number.
4. How heavy is the HPV140 main pump?
Approx. 270 kg, with export packing of approx. 60 x 63 x 83 cm - important figures for sea-freight planning.
5. How do I know if my main pump is failing?
Typical signs: weak digging force, slow or jerky movements, abnormal noise, overheating or low system pressure. Diagnose oil, filters and relief pressure before replacing the pump.
6. Can I repair the HPV140 instead of replacing it?
Yes - HPV140 repair kits (pistons, slippers, plate, seals) are available in the aftermarket. The condition of the pump body decides whether repair or replacement is more economical.
7. How much does an HPV140 main pump cost?
Prices vary by quality tier (genuine / OEM / aftermarket / rebuilt). Request a quote with your machine serial number and the old pump part number for accurate pricing.
8. How often should I service the hydraulic system?
Follow the Komatsu maintenance schedule: change hydraulic oil and filters at the recommended intervals, check suction filters and keep the oil clean - contamination is the main cause of pump failure.
9. How do I check my pump's part number?
The Komatsu part number is stamped on the pump nameplate. Record it together with the machine serial number when ordering to guarantee fit.
10. Where can I buy an HPV140 main pump?
RITO HYDRAULIC supplies the PC300-7 HPV140 main pump with export packing and warranty. Send your machine serial number and old pump part number for a quote.
11. Conclusion: Get the Right HPV140 for Your Machine
A quality main pump restores the digging force, speed and efficiency of your PC300-7. Confirm the machine serial number and old pump part number, choose the right quality tier, and plan the freight based on the 270 kg weight - and your excavator will be back to full production quickly.
Request a quote today - send your PC300-7 machine serial number and old main pump part number to RITO HYDRAULIC for pricing, warranty and lead time.
- CAT 330GC Final Drive — Which Part Number Fits and What Should You Check Before You Buy?
- Why Do Customers Need the TM40 Travel Assembly? When It Is Used, What It Does, and What It Changes
- Komatsu PC300-8 / PC350-8 Hydraulic Pump: Which 708-2G Number Fits, and Why PC300-7 Numbers Keep Appearing
- Why Does a CAT 320C / 320D Hydraulic Pump Lose Power Under Heavy Load?
- Why Does Your CAT 312C Need the SBS80 Hydraulic Pump?
