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PC30-7 Mini Excavator Hydraulic Swing Motor Assembly (708-7S Type OEM 708-7S-00022 20S-26-00020)
Place of Origin:China
Brand Name:HanRui
Model Number:PC30-7
Product Description
Compact Excavator Slew Mechanism
HanRui PC30-7 Excavator Hydraulic Swing Motor & Slew Gearbox Assembly (708-7S Series)
Factory-direct OEM replacement engineered for 3.0-to-3.5 ton compact excavators. Powered by the high-torque 708-7S series fixed displacement axial piston motor coupled with a heavy-duty planetary gear reduction box (Cross Ref: 708-7S-00022 / 20S-26-00020). Equipped with automatic wet multi-disc parking brake and dual cushion relief valves, ensuring smooth starting, zero swing drift, and precise slewing positioning.
⚙️ Motor Model: 708-7S Series Axial Piston Slew Motor ⚡ Rated Pressure: 24.5 MPa (3550 PSI) 🛡️ Integrated Multi-Disc Brake & Planetary Drive
Wholesale Price
$650 – $1,450 USD/Unit
Direct factory price — complete swing 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 & brake holding tested
Precision Slew Drivetrain Engineering Highlights
⚙️ 708-7S Plunger Mechanism
Features a high-pressure axial rotary group with nitrided cylinder block and bimetal valve plate, ensuring fast acceleration and zero internal bypass.
🛡️ Anti-Drift Multi-Disc Wet Brake
Spring-applied, hydraulic-release mechanical holding brake locks the superstructure instantly when controls return to neutral, preventing boom slewing drift on slopes.
🔩 Forged Pinion & Planetary Gears
Heavy-duty 20CrMnTi gear reduction train and integrally hardened output drive pinion mesh perfectly with the excavator's swing ring bearing.
Technical Specifications & Motor Fitment Matrix
| Applicable Machine Models | PC30-7, PC30-7E, PC30R-7, PC38UU-2 (3.0–3.5 Ton Mini Excavator) |
| Original Motor Type / Model | 708-7S Series (Fixed Displacement Axial Piston Slew Motor) |
| Cross-Reference OEM Numbers | 708-7S-00022, 20S-26-00020, 708-7S-00040, 20S-26-00010 |
| Rotary Group Kit Number | 708-7S-13110 / 708-7S-13230 / 708-7S-13311 |
| Rated Working Pressure | 20.6 MPa ~ 24.5 MPa (206 – 245 Bar) |
| Integrated Valve Block | Pre-installed Cross-Over Shock Relief Valves + Anti-Reaction Cushion Valves |
| Assembly Status | 100% Complete Plug-and-Play Assembly (Motor + Gearbox + Drive Pinion + Brake) |
PC30-7 Swing Motor & Slew Gearbox Field Diagnostic Guide
Fault 1: Upperstructure Drifts on Slopes / Swing Arm Creeps When Neutralized
Root Cause: Worn internal mechanical wet brake friction discs, weakened brake springs, or pressure bypass inside the 708-7S piston barrel allowing fluid slippage.
Field Remedy: Install a brand-new calibrated HanRui PC30-7 swing motor assembly (708-7S-00022) to instantly restore rock-solid brake holding.
Field Remedy: Install a brand-new calibrated HanRui PC30-7 swing motor assembly (708-7S-00022) to instantly restore rock-solid brake holding.
Fault 2: Heavy Slew Shaking, Jerking, or Metallic Grinding During 360° Rotation
Root Cause: Severe pitting on planetary gears, damaged needle roller bearings, or excessive backlash on the drive pinion shaft meshing with the swing bearing.
Field Remedy: Replace the complete swing motor and planetary gearbox unit to prevent catastrophic gear tooth fragmentation.
Field Remedy: Replace the complete swing motor and planetary gearbox unit to prevent catastrophic gear tooth fragmentation.
Fault 3: Slow Slew Speed & Weak Rotation Force Once Oil Reaches Operating Heat (>60°C)
Root Cause: High oil temperature lowers fluid viscosity; radial wear between the rotary cylinder block and distribution valve plate causes severe internal oil bypass.
Field Remedy: Inspect hydraulic oil cleanliness and swap in a fresh bench-tested swing device to recover original rotation speed.
Field Remedy: Inspect hydraulic oil cleanliness and swap in a fresh bench-tested swing device to recover original rotation speed.
Frequently Asked Questions (FAQ)
Q: What is the exact motor model and OEM part number for this PC30-7 swing device?
A: It is built on the 708-7S series axial piston motor design, primarily cross-referenced under OEM numbers 708-7S-00022 and 20S-26-00020.
Q: Is this a complete unit ready for immediate drop-in replacement?
A: Yes. It is a 100% turnkey unit including the hydraulic piston motor, integrated planetary reduction gearbox, drive pinion shaft, and internal parking brake mechanism.
Q: How do you verify and test the swing motor before dispatch?
A: Each HanRui swing device undergoes a complete test bench run: we verify rotation torque, holding brake torque under full load, cross-over relief valve pressure, and check for zero case leakage.
Looking for a Replacement Swing Motor for PC30-7?
Share your machine serial number or photo of your existing swing motor nameplate (708-7S-00022 / 20S-26-00020) for instant fitment verification and competitive wholesale quotes.
Request Instant Quote & Delivery Schedule
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