JCB 85Z-1 100C-1 Swing Motor 333/W4439 NACHI PCR-5B-30A-FGP-9407A Excavator Rotary Reducer

Name: JCB 85Z-1 100C-1 Swing Motor 333/W4439 NACHI PCR-5B-30A-FGP-9407A Excavator Rotary Reducer
Brand: BELPARTS MACHINERY LIMITED

Price Negotiable

Price: Negotiation

MOQ: 1 PCS

Delivery Time: 3-7 Day

Brand: Belparts

Product Description

Original Nachi PCR‑5B‑30A‑FGP‑9407A Integrated Swing Motor Reducer Device 333/W4439 336/E4311 336/E4315 for JCB 85Z‑1 86C‑1 90Z‑1 100C‑1 Midi Excavator

1. OEM Part Number & Machine Compatibility

Original swing motor model: Nachi PCR‑5B‑30A‑FGP‑9407A fixed‑displacement integrated swing motor with 2‑stage planetary reduction gearbox
JCB OEM interchange part numbers: 333/W4439, 336/E4311, 336/E4315
Fully compatible excavator models: JCB 85Z‑1, 86C‑1, 90Z‑1, 100C‑1
All listed part numbers are iterative supersession revision codes for the same complete swing assembly. Unified mounting flange bolt pattern, output pinion spline specification, hydraulic inlet‑outlet port layout and factory pressure calibration. Genuine original unit supports direct bolt‑on replacement with no modification to revolving platform or hydraulic pipelines required.

2. Core Technical Specifications

Structure type: Fixed‑displacement axial piston swing motor + two‑stage compact planetary reduction gear reducer, integrated multi‑disc mechanical parking brake
Motor displacement: 30.5 cm³/rev
Total gear reduction ratio: 82

Standard Working Parameters

Rated working pressure: 24.5 MPa
Maximum relief pressure: 27.0 MPa
Rated swing speed: 13 rpm
Max swing output torque: 5120 N·m
Full 360° continuous rotation, perfectly matched to factory hydraulic system for 8‑10 ton JCB midi excavator platform
Mounting PCD, pinion tooth profile and oil‑port position strictly comply with JCB OEM dimensional drawings
Motor housing and gearbox casing are high‑strength cast iron; internal piston shoes, valve plate, planetary gears, carrier and heavy‑load bearings adopt quenched wear‑resistant alloy steel for urban construction, site development and general contracting operations.

3. Internal Structure & Functional Introduction

Axial piston swing motor delivers stable low‑speed high torque to drive upper structure left‑right slewing for digging and material positioning.
Built‑in multi‑disc spring‑applied hydraulic‑release parking brake automatically locks the revolving table when hydraulic pressure drops, preventing free swing on sloped ground.
Two‑stage compact planetary gear set amplifies motor torque, delivering steady slewing output under full bucket load conditions.
Integrated buffer relief valve absorbs hydraulic pressure spikes at swing start‑stop, protecting internal components from pressure‑shock damage.
Compact integrated layout fits the confined installation space of JCB 85Z‑1 / 86C‑1 / 90Z‑1 / 100C‑1 upper revolving frame.

4. Product Advantages

Genuine original Nachi complete swing reducer assembly, 1:1 OEM outer casting dimensions, plug‑and‑play fitment, no cutting or re‑working of hoses, revolving platform or mounting brackets.
Every original swing motor passes full factory hydraulic bench inspection before shipment: swing speed test, pressure stability test, internal leakage test and brake holding torque verification.
Full overhaul spare parts available: complete seal repair kits, piston assemblies, valve plate, planetary gear sets, carrier, bearings and friction brake discs for component‑level maintenance.
Multiple cross‑reference JCB OEM numbers cover four midi‑excavator models, simplifying order processing, stock classification and inventory management for dealers and repair workshops.
Standard 12‑month full warranty for original unit, performance consistent with factory‑installed swing motor assembly.

5. Packaging & Global Delivery Details

Hydraulic oil ports and output pinion are coated with anti‑rust grease and fitted with dust‑proof protective plugs.
Entire swing motor reducer wrapped with moisture‑proof plastic film and secured inside export‑grade solid wooden crate to avoid collision and damp corrosion during long‑distance sea or air transit.
In‑stock original units can be dispatched within 3‑5 working days after order confirmation.
Multiple global shipping solutions available: international air express, sea LCL bulk shipment, overland truck transport for global midi‑excavator aftermarket markets.

6. FAQ

Q: Are 333/W4439, 336/E4311, 336/E4315 mutually interchangeable? A: Yes, these are JCB iterative supersession part numbers for Nachi PCR‑5B‑30A‑FGP‑9407A swing assembly, fully cross‑replaceable for JCB 85Z‑1, 86C‑1, 90Z‑1, 100C‑1.
Q: Does this original swing reducer fit directly on the listed JCB midi excavators? A: Yes, unified OEM mounting dimensions and factory‑calibrated hydraulic parameters support direct bolt‑on installation without extra adjustment or modification.
Q: What is the relation between PCR‑5B‑30A‑FGP‑9407A and JCB OEM part numbers? A: PCR‑5B‑30A‑FGP‑9407A is Nachi original swing motor model designation; 333/W4439, 336/E4311, 336/E4315 are JCB‑assigned OEM part numbers for this full swing motor reducer assembly.
Q: Are overhaul spare parts available for PCR‑5B‑30A‑FGP‑9407A? A: Matching full seal kits, piston shoe assemblies, valve plates, planetary gear carriers and brake friction discs are available for partial overhaul and single‑component replacement work.