Komatsu PC20-7 Main Hydraulic Pump Assembly (OEM 705-41-01050)

The hydraulic power plant on the Komatsu PC20-7 compact excavator relies on an engine-mounted multi-stage gear pump to feed the 709-35-11100 control valve. Tatan Machinery stocks and supplies 100% Brand New replacement hydraulic main pump assemblies (OEM reference: 705-41-01050 / 705-41-01051, backward compatible with 705-41-01030). Each complete pump is manufactured with precision-machined alloy housings, hardened gear pairs, and high-temperature shaft seals to restore factory breakout force and cycle speeds to 2.6-ton Komatsu machines.

Source Verification: First-Party Physical Stockholding

We are a specialized stocking supplier of excavator hydraulic components. We do not dropship unverified goods. All hydraulic pumps, control valves, and final drives supplied on our site are 100% Brand New (our diesel engine assemblies are remanufactured to OEM tolerances).

Field Reality: Why Rebuilding Worn PC20-7 Gear Pumps Fails

When a 2.6-ton excavator loses digging power under heat, mechanics often attempt to install an aftermarket seal kit. On gear pumps, this rarely restores pressure. Here is why replacing the complete unit makes economic sense:

• Internal Aluminum Body Clearance Scoring: Pressure loss is not caused by dead O-rings—it is caused by gear tip friction eating deep tracks into the aluminum pump housing chamber. New seals cannot close a 0.1mm metal gap. Once oil heats past 50°C, high-pressure fluid slips back to suction.
• End-Plate Bronze Bushing Ovality: Continuous side load from the drive coupling wears the internal bronze journal bushings into an oval shape. This causes the gear teeth to wobble and chew into the pump casing walls, generating metallic glitter.
• Risk of Destroying the 709-35-11100 Control Valve: A failing pump sheds microscopic aluminum and bronze particles directly into the multi-spool main valve. Trying to “limp” an old pump along frequently ruins the $2,000+ control valve.
• Labor Cost Comparison: Disassembling, cleaning, and resealing an old pump consumes 4–6 hours of shop labor with a 70% risk of low pressure upon re-installation. Installing a 100% Brand New unit takes 90 minutes and guarantees factory breakout force.

Factory Dyno Testing & 12-Month Component Warranty

To guarantee plug-and-play reliability overseas, every 705-41-01050 pump is tested on our automated hydraulic test bench under full working parameters before export approval:

1. Peak Pressure Hold Integrity: Pressurized to full 20.6 MPa (210 bar) relief threshold to verify casting density and joint face seal compression.
2. Stage-by-Stage Flow Delivery: Measuring volumetric output across both primary implement circuits to guarantee synchronous tracking and arm speed.
3. Shaft Seal Backpressure Hold: Pneumatic air decay check on the front lip seal to verify zero risk of hydraulic fluid blowing into the engine flywheel housing.

Export Packing & Moisture Defense

Hydraulic gear pumps require rigorous sealing against ocean humidity and physical impact during international courier handling:

• Machined Port Blanking: Every suction and discharge port is sealed with heavy-gauge O-ring plugs to prevent grit ingress.
• Anti-Oxidation Coating: The bare steel drive spline and mounting face are treated with industrial rust inhibitor and wrapped in VCI barrier film.
• Shock-Absorbing Solid Enclosure: Supported in tailored internal high-density cushioning inside an ISPM 15 compliant fumigation-free wooden export box.

Sealed ports, protective anti-corrosion wrap, and reinforced wooden crating

Worldwide Express & Freight Transit

Prompt logistics dispatch adapted for urgent machine-down emergencies and trade stock:

• Air Express (3–7 Days Door-to-Door): Handled via DHL Express, FedEx, or air cargo for rapid jobsite recovery.
• Sea Freight Consolidation: Economical LCL shipping for distributors stocking multiple units.
• Tariff-Ready Paperwork: Commercial invoice detailing official HS Code (8413.60), packing lists, and Certificate of Origin (COO) upon request.

Daily overseas air express dispatches and consolidated container freight

Field Commissioning Rules: Protect Your New Pump

Gear pumps rely entirely on clean hydraulic fluid for shaft bushing lubrication. You MUST perform these steps during assembly:

1. Manual Fluid Priming: Pour clean hydraulic oil into the pump suction port and rotate the input spline shaft several turns by hand before bolting on the suction flange. Never start a gear pump dry!
2. Replace Suction Strainer & Filter Cartridge: If the previous pump suffered bronze wear, metal debris is sitting in the return filter. Install fresh 10-micron filtration elements and inspect the suction hose for inner lining collapse.
3. Inspect Flywheel Drive Coupling: Inspect the rubber drive damper attached to the 3D84N-2H engine flywheel. If the rubber is hardened or missing teeth, replace it to avoid side-loading the pump shaft.
4. Initial 10-Minute De-Aeration Cycle: Crank the engine with the fuel solenoid disconnected to circulate fluid. Start the engine and let it run at low idle (800 RPM) for 10 minutes without touching the levers to vent all air bubbles back to tank.

Procurement Decision FAQ: What Buyers Ask

🔗 Frequently Purchased Together with Komatsu PC20-7 Main Hydraulic Pump:

• DIESEL ENGINE:
  Komatsu PC20-7 3D84N-2H Diesel Engine Assembly (YM129158-77010)
  Remanufactured
• MAIN VALVE:
  Main Control Valve Assembly (709-35-11100) for Komatsu PC20-7
  100% Brand New
• SWING MOTOR:
  Hydraulic Swing Motor Assembly for Komatsu PC20-7
  100% Brand New
• FINAL DRIVE:
  Final Drive Travel Motor Assembly for Komatsu PC20-7
  100% Brand New
• BRAND CATALOG:
  View All Komatsu Excavator & Heavy Equipment Parts Collection

Get Wholesale Factory Quote for PC20-7 Main Pump 705-41-01050

Looking for direct factory pricing, stock availability, or 12-month warranty terms for Komatsu PC20-7 main pumps? Contact senior specialist Gavin now!

💡 Fast Quote: Send your machine serial number or current pump photos for an accurate match within 10 minutes!