Planetary Gearboxes and Transmission Units

JSH Series Hydraulic Slewing Drives and Rotary Drive Units

JSH hydraulic slewing drives combine hydraulic motor, planetary gearbox, brake and pinion output for cranes, drilling rigs and rotary systems.

Focus: Slewing torque, positioning accuracy and holding brake matching
Engineering boundary: Final sizing, configuration and interface require JST engineering confirmation.

Product Overview

Series capability and selection context

JSH hydraulic slewing drives combine hydraulic motor, planetary gearbox, brake and pinion output for cranes, drilling rigs and rotary systems.

Designed for slewing and indexing duties where compact high-torque rotary output is required.

Reducer ratio, brake holding torque and motor displacement can be matched to the rotating structure.

Flange, bolt pattern, output interface and port direction can be matched from the installation drawing.

Technical Data

Item	JSH Hydraulic Slewing Drive
Main function	Controlled rotation through pinion and slewing ring
Output interface	Pinion gear for slew bearing or ring gear
Typical use	Crane swing, drilling rig rotation, aerial platform rotation
Selection focus	Torque, gear module, backlash, brake and rotation speed

Configuration Reference

Final sizing, configuration and interface require JST engineering confirmation.

Brake	Spring-applied hydraulic-release multi-disc brake available.
Hydraulic options	Open circuit, closed circuit, counterbalance valve, relief valve and distributor options.
Customization	Pinion gear, mounting flange, oil ports, paint, seals and documentation can be customized.

Applications

Selection Guide

Required output torque: confirm continuous torque, peak torque and safety factor for wind load, boom load or eccentric load.
Slewing speed: define target rpm at the rotating structure and available hydraulic flow.
Ring gear interface: provide module, pressure angle, tooth number, pitch diameter and gear direction for the pinion output.
Hydraulic pressure and flow: confirm rated pressure, maximum pressure, pump flow and motor displacement preference.
Brake requirement: choose static holding brake, dynamic braking control or brake release pressure according to machine safety needs.
Mounting space: check flange size, pilot diameter, bolt circle, pinion position and installation orientation.
Control circuit: specify open circuit, closed circuit, counterbalance valve, relief valve or integrated distributor options.
Pinion gear module, tooth number, pressure angle and heat treatment according to the slewing ring.

Engineering Notes

Product type: Integrated hydraulic slewing drive / rotary drive unit.
Core components: Hydraulic motor, planetary gearbox, brake, valve or distributor options and output pinion.
Output style: Pinion output for slewing ring or rotary gear engagement.
Torque capacity: Selected according to continuous torque, peak torque and safety factor.
Speed range: Configured by motor displacement, gearbox ratio and available flow rate.
Brake: Spring-applied hydraulic-release multi-disc brake available.
Hydraulic options: Open circuit, closed circuit, counterbalance valve, relief valve and distributor options.
Customization: Pinion gear, mounting flange, oil ports, paint, seals and documentation can be customized.

Final sizing, configuration and interface require JST engineering confirmation.

Technical Support