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PC30-7 Mini Excavator Hydraulic Travel Motor Final Drive Assembly (Nachi PHV-3B / PHX-300N Type OEM 20S-60-72120 843000148)
Place of Origin:China
Brand Name:HanRui
Model Number:PC30-7
Product Description
Mini Excavator Undercarriage & Drivetrain
HanRui PC30-7 Hydraulic Travel Motor & Final Drive Assembly (Nachi PHV-3B Type)
Factory-direct OEM replacement engineered for 3.0-to-3.5 ton compact excavators. Driven by the heavy-duty Nachi PHV-3B / PHX-300N dual-speed axial piston motor integrated with a multi-stage planetary gearbox (Cross Ref: 20S-60-72120 / 843000148 / 843000166). Provides powerful climbing torque, smooth dual-speed automatic shifting, and zero oil leakage under severe job site mud and rock conditions.
⚙️ Motor Model: Nachi PHV-3B / PHX-300N Dual-Speed Motor ⚡ Rated Pressure: 26.5 MPa (3840 PSI) 🛢️ Pre-Filled with Extreme Pressure Gear Oil
Wholesale Price
$850 – $1,750 USD/Unit
Direct factory price — complete track motor with gearbox
MOQ & Dispatch
1 Unit (In Stock)
Fast worldwide express air freight in 1–3 business days
Quality Assurance
12 Months
100% dynamometer torque & seal pressure tested
High-Torque Drivetrain Engineering Highlights
⚡ Nachi PHV-3B Piston Mechanism
Equipped with high-pressure swashplate axial pistons for rapid acceleration, powerful gradeability, and seamless 2-speed automatic downshifting under heavy resistance.
🛡️ Precision Duo-Cone Floating Seals
Fitted with precision-lapped alloy mechanical face seals that permanently lock lubricant inside and prevent wet mud, grit, and abrasive slurry contamination.
🔩 Carburized Planetary Reduction Train
Planet gears and sun shafts forged from 20CrMnTi alloy steel with multi-stage heat treating to ensure outstanding impact toughness and tooth shear resistance.
Technical Specifications & Travel Motor Fitment Matrix
| Applicable Machine Models | PC30-7, PC30-7E, PC30R-7, PC38UU-2 (3.0–3.5 Ton Mini Excavator Class) |
| Original Motor Type / Model | Nachi PHV-3B / PHX-300N Series (2-Speed Axial Piston Motor) |
| Cross-Reference OEM Numbers | 20S-60-72120, 843000148, 843000166, 20R-60-72120, 842010084 |
| Sprocket & Frame Flange Pattern | 9-Hole or 12-Hole Sprocket / Frame (Frame pilot: 165mm, Sprocket pilot: 210mm) |
| Rated Operating Pressure | 24.5 MPa ~ 26.5 MPa (245 – 265 Bar) |
| Hydraulic Port Configuration | 3 or 4 Ports (Forward Main, Reverse Main, Case Drain, 2-Speed Pilot Line) |
| Assembly Status | 100% Complete Plug-and-Play Assembly (Motor + Planetary Gearbox + Pre-filled Lube) |
PC30-7 Travel Motor & Final Drive Field Diagnostic Guide
Fault 1: Excavator Veers or Tracks to One Side with Weak Tractive Effort
Root Cause: Excessive wear or scoring between the cylinder barrel and valve plate inside the hydraulic motor, causing severe internal high-pressure bypass directly to the case drain.
Field Remedy: Install a brand-new calibrated HanRui PC30-7 (PHV-3B) travel motor assembly to restore balanced track speed and climbing power.
Field Remedy: Install a brand-new calibrated HanRui PC30-7 (PHV-3B) travel motor assembly to restore balanced track speed and climbing power.
Fault 2: Gear Oil Dripping from the Sprocket Rim or Slurry Inside Gearbox
Root Cause: Duo-Cone floating seal failure caused by wire/debris entanglement, allowing planetary gear lubricant to leak out and grit to cause bearing seizure.
Field Remedy: Immediately inspect; if planetary gears or bearings are damaged from oil starvation, replace the complete final drive unit.
Field Remedy: Immediately inspect; if planetary gears or bearings are damaged from oil starvation, replace the complete final drive unit.
Fault 3: Two-Speed Shifting Fails (Machine Stuck in Low Speed or High Speed)
Root Cause: Stuck 2-speed pilot shift control spool or inadequate pilot control pressure (<3.5 MPa) failing to stroke the motor swashplate.
Field Remedy: Check the 2-speed pilot line pressure; if pilot pressure is normal, replace the travel motor head to restore automatic high/low shifting.
Field Remedy: Check the 2-speed pilot line pressure; if pilot pressure is normal, replace the travel motor head to restore automatic high/low shifting.
Frequently Asked Questions (FAQ)
Q: What is the exact motor model and OEM number for this PC30-7 travel drive?
A: It is manufactured to Nachi PHV-3B / PHX-300N 2-speed axial piston motor standards, cross-referenced under OEM part numbers 20S-60-72120, 843000148, and 843000166.
Q: Is this a complete final drive unit ready to bolt on?
A: Yes. It is a 100% turnkey unit including the dual-speed hydraulic piston motor, planetary gearbox, mechanical floating seals, and pre-filled gear oil.
Q: How do I verify bolt hole counts (9-hole vs 12-hole) for my PC30-7?
A: Simply count the bolt holes on your sprocket and frame mounting flanges. We have both 9-hole and 12-hole configurations in stock for immediate shipment.
Looking for a Replacement Final Drive for PC30-7?
Provide your machine serial number or sprocket bolt count for immediate fitment confirmation, express courier air rates, and competitive wholesale quotes.
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