PCR-4B-20A-FP

PCR-4B-20A-FP

2 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 3 year year

Product details

1. Product Overview

TheVolvo 55 Swing Motor Assembly PCR-4B-20A-FPis a core component of the swing system for Volvo EC55 series excavators, responsible for driving the rotation of the upper structure (cab, boom, etc.). The model numberPCR-4B-20A-FPindicates its design version, displacement, and interface compatibility, tailored for medium-sized hydraulic excavators.

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2. Core Functions

• Swing Drive: Converts hydraulic energy into mechanical rotational energy, enabling ±360° continuous rotation of the excavator’s upper structure.

• Load Control: Integrated brake valve and damping device reduce impact during startup/stoppage, enhancing operational stability.

• Sealing Design: Features dual-lip seals and dust-proof rings to prevent hydraulic oil leakage and contamination ingress.

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3. Technical Specifications

【表格】

Parameter Specification

Model PCR-4B-20A-FP

Compatible Models Volvo EC55B/EC55D/EC55E

Displacement 20 mL/r (per revolution)

Rated Pressure 280 bar (continuous operation)

Peak Pressure 320 bar (instantaneous max)

Speed Range 0–15 rpm (stepless adjustment)

Braking Torque 1,200 N·m (static braking)

Port Type SAE O-ring (port size: M22×1.5)

Weight Approx. 45 kg

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4. Structural Components

(1) Hydraulic Motor Body

• Cylinder Block & Piston Group: 7 axial-piston units with high-strength alloy steel (e.g., 42CrMo4), hard-chrome plated (≥850 HV).

• Port Plate: Copper-based alloy (ZQSn6-6-3) with dual-kidney oil passages for optimized high/low-pressure switching.

• Bearing System: Tapered roller bearings (model 32010) for combined axial/radial load support.

(2) Brake Assembly

• Spring Brake: Disc spring set provides 1,200 N·m braking torque; hydraulic release requires ≥18 bar pressure.

• Damping Valve: Built-in to limit pressure shock during swing startup/stoppage (≤50 bar).

(3) Sealing System

• Shaft Seal: Fluororubber (FKM) dual-lip seal, resistant to -40°C–+150°C.

• Dust Wiper: Polyurethane (PU) scraper ring to prevent particle ingress.

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5. Common Failures & Solutions

【表格】

Symptom Possible Causes Solutions

Weak Swing/Slow Speed Hydraulic oil contamination, brake not released, internal leakage Replace hydraulic oil, check brake pressure, replace seals

Swing Vibration Worn port plate, piston seizure Grind port plate, clean/replace pistons

Abnormal Noise Bearing failure, gear misalignment Replace bearings, inspect brake gears

Oil Leakage Aged shaft seal, cracked housing Replace shaft seal, weld-repair housing

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6. Maintenance Recommendations

• Routine Inspection: Check oil level, seal condition, and brake pressure every 500 hours.

• Oil Requirements: Use ISO VG46 anti-wear hydraulic oil with cleanliness ≤ NAS 1638 Class 9.

• Replacement Intervals: Seals every 2,000 hours; bearings inspected every 4,000 hours.

• Storage Conditions: Fill with hydraulic oil during long-term storage (-20°C–+60°C).

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

3 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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