Description
The hydraulic command center of the 20-ton Caterpillar 320C excavator must manage high-volume oil delivery from dual main pumps while compound digging, swinging, and tracking simultaneously. Tatan Machinery stocks and supplies 100% Brand New KMX15R main control valve assemblies (OEM reference: 172-5636 / 190-7856, interchangeable with 244-1704 / 206-3305). Built with micro-finished hardened alloy spools and factory-set relief cartridges, each complete valve block eliminates the dreaded boom-sink and sluggish travel typical of worn 320C machines. Backed by our 12-Month Comprehensive Replacement Warranty.
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).
| Supplying Entity: | Tatan Machinery (Excavator Component Exporter) |
| Component Classification: | Main Control Valve Assembly / Hydraulic Parts |
| Valve Series: | KMX15R Multi-Section Proportional Distributor |
| OEM Master Assembly Code: | 172-5636 / 190-7856 (Cross Ref: 244-1704, 206-3305, 161-0080) |
| Manufacturing Standard: | 100% Factory Brand New (Unused, Full Bench Pressure Tested) |
| Target Machine Brand: | Caterpillar Excavator Parts Collection |
📦 Heavy Valve Block Inventory & Inspection Facility
Physical inventory staging, steel port blanking inspection, and export crating facility:
Physical inventory verified — ready for global crating. Video inspection calls and warehouse visits welcome.
Hydraulic & Mechanical Fitment Specifications
| Engineering Property | Design Metric |
|---|---|
| Main Circuit Rated Pressure | 34.3 MPa (350 bar / 4,978 PSI) Heavy Digging Threshold |
| Combined Dual-Pump Flow Intake | 2 × 205 L/min (410 L/min total flow delivery from main pump) |
| Flow Logic Integration | Negative Flow Control (NFC), Boom/Stick Regeneration & Straight Travel Logic |
| Port Connection Standard | SAE Code 62 High-Pressure 4-Bolt Flanges & O-Ring Boss Pilot Ports |
| Total Assembly Weight | Approx. 165 kg (364 lbs) Cast Alloy Sectional Monoblock |
| Standard Machine Match | Caterpillar 320C, 320C L, 320C LN (20-Ton Excavator Class) |
Field Reality: Why Re-Sealing Old CAT 320C Control Valves Fails
The CAT 320C has logged 15,000 to 25,000 operating hours worldwide. Field mechanics often attempt to fix low digging speed or boom drift by installing an aftermarket valve seal kit. On 320C valves, this almost always fails to restore factory performance:
- Internal Spool Bore Ovality & Washout: Decades of pressurized fluid erosion washes out the cast iron internal valve bores. Replacing external O-rings does nothing to fix the enlarged 0.025mm clearance between the hardened steel spool and the cast housing. Once oil warms up, pump delivery slips directly into the tank return gallery.
- Regeneration & Flow-Merging Spool Galling: The boom regeneration circuit on the 320C depends on razor-sharp metering notches. Particulate contamination galls the spool edges, preventing dual-pump flow from merging. The excavator hesitates and jerks when lifting the boom and crowding the stick at the same time.
- Anti-Drift Check Valve Seat Erosion: Boom holding valves develop micro-grooves on their hardened poppet seats. A suspended rock bucket or heavy pipe attachment slowly creeps downward, failing safety inspections on commercial jobsites.
- Cracked Internal Partition Lands under 350 Bar Surges: Years of hammer breaking or hard rock ripping fatigue the thin internal cast dividers between adjacent slices. High pressure bleeds into the swing circuit, causing uncommanded cab rotation when traveling.
Factory Dyno Testing & 12-Month Component Warranty
To guarantee immediate factory performance overseas, every 172-5636 control valve is bench-tested on our automated digital hydraulic test stand before export approval:
- Main & Port Relief Setting Lock: Main relief cartridges set and locked to Cat 320C factory specifications (34.3 MPa working relief) on our high-pressure test stand.
- Spool Neutral Holding & Bypass Leakage Test: Individual circuit testing under full working pressure to verify zero cylinder creeping and tight check-valve seat sealing.
- Flow-Merging Spool Actuation Timing: Dynamic pilot actuation testing to verify seamless hydraulic oil merging for fast boom-up and stick-in cycle times.
- Straight-Travel Logic Verification: Testing the dedicated straight-travel spool under simultaneous tracking and boom actuation to ensure straight-line tracking without steering veer.
📹 Workshop Control Valve Dyno Testing Live Clip
Watch our technician inspect valve ports, relief cartridges, and casting stamps:
✓ Live unit filmed on hydraulic test stand at Tatan Machinery facility
Export Packing & Logistics Dispatch
A heavy 165 kg valve block requires clinical protection against contamination and transit shock:
- Solid Steel Port Blanking: All SAE high-pressure split-flange ports and pilot connections sealed with O-ring steel blanking plates.
- VCI Vapor-Phase Anti-Corrosion Wrap: The bare valve block is coated with rust-inhibiting hydraulic film and hermetically vacuum-sealed in VCI plastic foil.
- Custom Internal Structural Timber Bolting: The valve block is bolted down to heavy timber skids to prevent tipping.
- Prompt Global Shipping: Air express via DHL/FedEx (3–7 days) for machine-down emergencies, or consolidated sea freight (LCL/FCL) with complete HS Code (8481.20) paperwork.
Sealed steel port plates, protective anti-corrosion wax, and reinforced wooden crating
Field Commissioning Rules: Protect Your New Control Valve
To prevent instant spool contamination and maintain your 12-month warranty, technicians MUST adhere to these field rules:
- MANDATORY: Drain & Chemical Flush Hydraulic Oil Tank: If the previous valve block was replaced due to pump disintegration, metallic particles coat the tank floor. You MUST drain all old fluid, clean the reservoir floor, and install brand-new suction and return filter elements!
- Reverse-Flush Steel Delivery Hardlines: High-pressure hardlines between the SBS80 main pump and the 172-5636 valve block must be chemically flushed. A single trapped metal flake will instantly score a brand-new spool bore!
- Pre-Fill Pilot Filter & Purge Air: Fill the pilot circuit filter bowl with clean hydraulic oil. Air trapped in the pilot logic lines will cause jerky joystick response and violent pressure spikes.
- SAE Split-Flange Torque Pattern: Lubricate all SAE Code 62 O-rings with clean hydraulic oil. Torque 4-bolt flange clamps evenly in a cross-pattern to prevent high-pressure blowout under 350 bar surges.
- Initial Relief Pressure Verification: Connect a 60 MPa pressure gauge to the main pump delivery test port. Cycle boom and stick slowly at low idle before placing the machine under heavy digging loads.
Procurement Decision FAQ: What Buyers Ask
Q: Is this 172-5636 control valve brand new or remanufactured? Does it include relief valves?
A: This main control valve assembly is 100% Brand New with zero operating hours. It comes completely assembled with brand-new main relief valves, port overload relief valves, flow-merging spools, and pilot logic manifold blocks. It is a complete drop-in replacement ready for installation.
Q: Are your hydraulic components brand new? Why are your engines remanufactured?
A: Every hydraulic pump, main control valve, travel motor, and swing motor on our site is 100% Brand New. Only our heavy diesel engine assemblies on this site are professionally remanufactured with brand-new internal wear components. You can order with absolute confidence in factory-new metallurgical reliability.
Q: My CAT 320C has part number 190-7856 or 244-1704. How do you confirm fitment?
A: These are interchangeable Caterpillar OEM assembly part numbers used across different 320C and 320C L production batches (prefixes AMC, ANH, BCK, BPR, RAW). Send your machine’s 17-digit PIN number from the cab tag and clear photos of your current valve’s top port arrangement to Gavin. We cross-verify the exact hydraulic schematic in the official Caterpillar parts database within 10 minutes.
Q: Can I see live photos and serial tags of the exact valve assigned to my order before paying?
A: Absolutely yes. Transparency is our core commitment. Prior to balance payment and dispatch, we send clear high-resolution photos and video showing the stamped valve body numbers, port sealing plugs, relief valve cartridges, and the export wooden box crating process.
Q: What happens if the valve crate is damaged during sea freight, and what customs documentation is supplied?
A: Every shipment from Tatan Machinery is covered by full commercial marine cargo insurance. The valve block is sealed with heavy steel plates and bolted into an ISPM 15 solid wooden crate. We supply commercial invoices with accurate HS Codes (8481.20 – Valves for Oleohydraulic Transmission), packing lists, and Certificates of Origin for smooth customs clearance at your destination port.
🔗 Frequently Purchased Together with CAT 320C Main Control Valve:
- DIESEL ENGINE:
Caterpillar 320C 3066T Diesel Engine Assembly (172-5184)
Remanufactured - HYDRAULIC PUMP:
SBS80 / AP-12 Main Hydraulic Pump for Caterpillar 320C
100% Brand New - SWING MOTOR:
M2X150 Swing Motor Assembly for Caterpillar 320C
100% Brand New - FINAL DRIVE:
Final Drive Travel Motor Assembly for Caterpillar 320C
100% Brand New - BRAND CATALOG:
View All Caterpillar Excavator & Heavy Equipment Parts Collection
Get Wholesale Factory Quote for CAT 320C Control Valve 172-5636
Looking for direct factory pricing, stock availability, or 12-month warranty terms for Cat 320C 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!
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote based on freight destination and configuration.
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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