JSTJST HYDRAULICHydraulic Motors & Drive Systems Manufacturer

Home / Products / Product Detail

JNM Series hydraulic motor seen from the distributor end, showing ports A/B and the five-cylinder star housing
01Distributor
02Ports A / B
03Five-cylinder star housing

Typical JNM configuration shown. Actual construction is per the approved drawing.

Hydraulic motor · Mainly custom-built

JNM Series
Hydraulic Motor

An oscillating-cylinder crankshaft radial piston motor for low speed and high torque. The pistons and oscillating cylinders carry no side load, and force passes from piston to crankshaft through rolling bearings, giving a starting mechanical efficiency above 0.92. A flat distributor design reaches a volumetric efficiency of up to 0.98. Displacement, output shaft and distributor can be configured to suit the machine.

Submit a custom request View catalog models
Catalog models
55models · 8 frame sizes
Rated output torque
235–17,100N·m
Displacement
59–4,298ml/r

Rated pressure 25 MPa (20 MPa for JNM1-350), maximum pressure up to 45 MPa. All displacements within a frame size share the same mounting dimensions, so torque and speed can be changed on the same mounting interface.

Technical data

JNM Series model data

Use the selection map to locate models by the torque and speed you need, then see the full data for that frame size in the table below.

Selection map

Each dot is one catalog model

N·m r/min

Showing all 55 models

Horizontal axis: rated torque (N·m, log scale).

Click any model on the map to see its data, or enter the torque you need.

Frame size

Unit
JNM Series hydraulic motor model data
ModelDisplacement (ml/r)Rated torque (N·m)Rated / max. pressure (MPa)Continuous speed (r/min)Weight (kg)
JNM05-605923525 / 451~70022
JNM05-757429525 / 42.51~70022
JNM05-908634325 / 37.51~70022
JNM05-11011545825 / 401~65022
JNM05-13012951325 / 37.51~65022
JNM05-15015160025 / 32.51~65022
JNM05-17016666025 / 32.51~60022
JNM05-20019176025 / 281~60022

Showing 8 of 55 models

Click a model to see its full data.

Ratings: rated torque is the theoretical torque at rated pressure (approximately specific torque × rated pressure), not the output at maximum pressure; maximum pressure is not a continuous working pressure. Continuous speed is the range for sustained operation; maximum speed is a short-term limit. JNM7 has a maximum power of 210 kW, so torque and speed cannot both be at their upper limits. Weight is the motor weight; distributor weights are listed separately (see below). The weight of a complete configuration is confirmed with the order.

Model code

What each part of the model code means

Example: JNM2-400BD31

JNM2-400BD31

  1. JNMJST oscillating-cylinder crankshaft radial piston motor
  2. 2Frame size; all displacements in a frame size share the same mounting dimensions
  3. 400Nominal displacement (ml/r)
  4. BShaft type: no letter = straight-sided external spline, A = involute external spline, B = parallel key, Z = tapered shaft with key, I = internal spline
  5. D31Distributor type, to be stated when ordering
  • The shaft type and distributor type must be stated when ordering.
  • The motor is reversible. With the inlet port closed it can run at high speed in freewheeling, and it can also run as a pump.
  • The shaft can take radial loads; please confirm the permissible value for your duty.

JNM1 construction

Sectioned operation and internal structure

In the section, red is high-pressure oil and blue is return oil. The distributor feeds the five oscillating cylinders in turn with the crank angle, and the pistons drive the crankshaft round continuously.

The animation shows one JNM1 configuration to explain the construction; refer to the data table and the matching drawings for a specific model.

Distributors

Distributor port faces

The distributor sets the port size and flow capacity and must be stated at the end of the model code when ordering. Click an image to enlarge it.

D31 distributor port face dimensions
D31Weight 3 kg
D40 distributor port face dimensions
D40Weight 5 kg
D47 distributor port face dimensions
D47Weight 6 kg
D90 distributor port face dimensions
D90Weight 14.5 kg
D250 distributor port face dimensions
D250High flow · Weight 25 kg

Custom builds

Mainly custom-built, designed around your machine

The catalog models are a starting point for selection. Each item below can be designed to the torque, speed and mounting conditions of your equipment.

A

Displacement & performance

  • Displacement changed within a frame size
  • Torque, speed and pressure matched to the duty
  • Pump or freewheeling operation
B

Shaft & mounting

  • External spline, parallel key, internal spline and other shaft ends
  • Mounting pilot and flange
  • Interfaces to gearboxes and winches
C

Distributor & valves

  • D31–D250 distributors
  • Integrated valve blocks such as counterbalance and relief valves
  • Drain port and port orientation

  • Typical applications

    Common application areas; the solution is confirmed for each machine's duty.

  • Hoisting winches & drum drivesWinches, hoists and drum drives
  • Slewing drivesSlewing and rotating mechanisms of all kinds
  • Track & wheel drivesLow-speed, high-torque travel drives
  • Mining, oil & coal machineryHeavy, metallurgical and mining equipment
  • Marine deck machineryDeck machinery, lifting and handling equipment

Related products

The JNM motor is a common drive unit for the JSC hydraulic transmission unit and the JSJ hydraulic winch; for larger displacements, see the JHM Series.

JSC hydraulic transmission unitMatching driveJSC Transmission Unit JSJ hydraulic winchMatching driveJSJ Hydraulic Winch JHM hydraulic motorOther motorsJHM Hydraulic Motor QJM hydraulic motorOther motorsQJM Hydraulic Motor
Technical articles JHM vs JNM hydraulic motors Radial piston vs orbital motors Motor case drain: flow, pressure and checks

Selection support

Tell us your duty,
we'll confirm the right motor configuration.

Send the information in the checklist and we will check it against the catalog models or assess a custom design. The product catalog and installation drawing are provided once the model and mounting interface are confirmed.

Request selection support Find the right model Request the catalog Request an installation drawing

Please include

  1. 01Required output torque (continuous and peak) and speed
  2. 02System pressure, flow and duty cycle
  3. 03Shaft type, mounting pilot and available space
  4. 04Distributor and valve requirements, or your current motor model

Model comparison