Komatsu PC20-7 Main Control Valve Assembly (OEM 709-35-11100)

Tatan Machinery supplies 100% Brand New multi-spool hydraulic main control valve assemblies (OEM part numbers: 709-35-11100 / 709-35-11101, interchangeable with 7093511100 / 723-17-11100) specifically built for Komatsu PC20-7 and PC25-1 mini crawler excavators. Serving as the primary hydraulic distribution hub on 2.6-ton excavators, this multi-section monoblock directs pressurized oil from the main pump to the boom, arm, bucket, dozer blade, offset boom swing, and dual travel motors. Backed by our 12-Month Comprehensive Replacement Warranty, each assembly is pre-fitted with factory-calibrated relief cartridges, dynamically bench-tested for zero internal spool bypass drift.

Supplier Information & Build Status

When to Replace the Main Control Valve on Komatsu PC20-7: Field Diagnostics

The Komatsu PC20-7 is a classic multi-task utility excavator often tasked with both deep trenching and grading with the dozer blade. When internal spool galling or micro-cracking strikes, replace the complete assembly under these severe symptoms:

• Dozer Blade Creep & Loss of Machine Jacking Support: When lifting the front tracks off the ground using the dozer blade to cross a trench or mud, the blade slowly bleeds down within 2–3 minutes. The pilot-operated check valve seat or the blade spool bore is scored past salvage limits.
• Boom Swing Offset Cylinder Drift: When digging trenches parallel to walls, high lateral leverage forces high-pressure oil past the boom swing port relief valves. Worn holding seats cause the boom to slowly skew off-center, ruining trench alignment.
• Uncontrolled Boom & Arm Drift Under Suspended Bucket: When lifting a trench box or bucket of gravel, the boom steadily creeps down with joysticks in neutral. Spool-to-bore clearances have worn past service limits (>0.015mm), allowing high-pressure oil to bypass to tank.
• Mechanical Control Lever Binding & Sticky Joysticks: Dirt packing behind the spool rubber dust boots combined with warped valve body sections causes spools to bind, preventing the machine from stopping track movement when levers are released.

Workshop Bench Testing & 12-Month Warranty Guarantee

Every 100% Brand New 709-35-11100 control valve supplied by Tatan Machinery comes backed by a 12-Month Comprehensive Replacement Warranty. Before export packaging, our technicians complete a 5-point quality validation:

1. Main & Port Overload Relief Pressure Calibration: Main relief valve calibrated to exact Komatsu PC20-7 factory specifications (20.6 MPa / 210 bar) on a digital hydraulic test bench.
2. Spool Neutral Holding & Bypass Leakage Test: Individual circuit testing under full working pressure to verify zero cylinder creeping and tight check-valve seat sealing.
3. Dozer Blade Lock Valve Pressure Hold Test: Testing the dedicated pilot check valve section to certify zero bleed-down under full machine weight simulation.
4. Mechanical Spool Centering & Return Spring Force: Confirming all spools return smoothly to neutral without mechanical sticking under full stroke.
5. Port Thread Gauge & Flange Inspection: Checking all O-ring boss and BSPP port threads to ensure leak-free field hose installation.

Export Heavy-Duty Packaging Process

Precision valve spools must be guarded against particulate contamination and rough transit:

• 100% Sealed Port Caps: Every hydraulic work port, pump inlet, tank return, and auxiliary line port is sealed with heavy-duty threaded protective plugs.
• Anti-Corrosion VCI Foil Wrapping: The valve block is sprayed with rust-preventive hydraulic oil and sealed inside moisture-proof VCI film.
• Custom Internal High-Density Cushioning: Bolted securely onto structural base timbers inside the crate to prevent any shift.
• ISPM 15 Fumigation-Free Solid Plywood Box: Fully enclosed export crate banded with high-tensile galvanized steel straps.

Actual sealed port caps and heavy-duty crating for 709-35-11100 control valve

Global Shipping & Customs Documentation

Fast, reliable dispatch tailored for commercial contractors and parts wholesalers worldwide:

• Emergency Machine Down Air Cargo: Fast air express via DHL Aviation, FedEx Freight, or international airlines within 3–7 business days.
• Consolidated Ocean Sea Freight (LCL / FCL): Direct containerized shipping to worldwide commercial ports.
• Clean Customs Clearance Paperwork: Commercial Invoices with correct HS Code (8481.20 – Valves for Oleohydraulic Transmission), Packing Lists, and Certificates of Origin for tariff optimization.

Container loading and air freight dispatch supported by global logistics partners

Critical Installation Guidelines (PC20-7 Hydraulic Technician Checklist)

To prevent instant spool contamination and maintain your 12-month warranty, technicians MUST adhere to these field rules:

1. MANDATORY: Drain Reservoir & Clean Tank Floor: If the previous valve block failed due to metal contamination from pump seizure, flush the tank floor completely. Residual metallic particles will lodge in the post-spool pressure compensators within 60 seconds!
2. Dozer Blade & Boom Swing Hose Tagging: The PC20-7 valve compartment is very tight. Tag each hose carefully before unbolting. Swapping the dozer blade lines with the boom swing lines will cause immediate control confusion and cylinder over-extension!
3. Mechanical Linkage Freedom Check: If your PC20-7 uses mechanical control rods, lubricate all linkage pins. Never allow bent rods to side-load the spool ends, as lateral binding will jam the spools inside the valve bores.
4. Bleed Air from Hydraulic Cylinders: Cycle all boom, arm, bucket, and blade cylinders slowly to both end-stops without hitting relief pressure to purge trapped air back to tank.
5. Check Relief Pressure on Test Port: Hook up a 30 MPa pressure gauge to the pump delivery test port. Verify that main relief operates at 20.6 MPa before placing machine under heavy digging load.

Buyer Frequently Asked Questions (Purchasing FAQ)

🔗 Frequently Purchased Together with Komatsu PC20-7 Main Control Valve:

• DIESEL ENGINE:
  Komatsu PC20-7 3D84N-2H Diesel Engine Assembly (YM129158-77010)
  Remanufactured
• HYDRAULIC PUMP:
  Main Hydraulic Pump Assembly (705-41-01050) 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 Control Valve 709-35-11100

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

💡 Fast Quote: Send your machine serial number or old valve nameplate photos for an accurate match within 10 minutes!