QJM family · Order by full model code
LSWR QJM hydraulic motor family
LSWR builds QJM as a radial steel-ball hydraulic motor family and lists it by application: marine, tunnelling and construction machinery. The catalogue has no numerical model table, so quote with a full designation, an interface drawing and your duty.
QJM names the family; your order needs the full code
LSWR describes QJM as a radial steel-ball hydraulic motor family. It sells orbital BM, crankshaft/connecting-rod JMDG and swinging-cylinder NGM motors as separate mechanisms. [1] Each is its own design, so settle the family before you compare models.
The QJM catalogue lists motors by application, such as marine, tunnelling and construction machinery motors. The marine entry is dated 24 November 2023 and shows a photograph of the motor with no numerical specification table. [2] [3] To size a QJM motor you need its displacement, operating pressure, permitted speed, external load limits and mounting drawing. Ask LSWR for all of these against one selected code.
This page lists no displacement, torque or pressure for QJM. Ask LSWR to select a full code and send its technical package. Approve the installation and compare quotes against that package.
Compare the old and proposed unit line by line
| Interface or requirement | Your existing unit | Proposed LSWR unit |
|---|---|---|
| Designation | Full nameplate code, serial identity and original documents | Complete code and controlled specification revision |
| Flange / envelope | Pilot, fixing pattern, orientation and available clearance | Dimensioned drawing and any installation differences |
| Output connection | Shaft/spline/key geometry and driven coupling | Matching drawing, connection limits and approved adaptation |
| Hydraulics | Ports, circuit, supply/return and case-drain arrangement | Port drawing and permitted circuit conditions |
| Service duty | Required starting, running and transient conditions | Performance data and limits for the selected variant |
A flange that bolts up can still differ in shaft-load capacity or in permitted return and drain conditions. Ask LSWR to mark every difference on its drawing. LSWR says its products replace imports. When the old unit is unidentified, ask for a written interchange approval before you order.
What if the original nameplate cannot be read?
Send clear photographs, interface dimensions, the driven equipment and any circuit or operating records. Ask LSWR to identify the unit as a first step, then quote a full code against that identification.
Describe the load and the hydraulic supply separately
Describe the load
Required torque and speed across the duty, start-up and reversal, intermittent peaks and external shaft loads. Include the coupling or reduction and the installation arrangement.
Describe the circuit
Available pressure and flow, return and drain arrangement, control and relief circuit, fluid, temperature and cleanliness requirements. Ask for the permitted conditions of the selected unit.
Say whether you want the motor alone or with a reducer, brake and controls. A travel drive, slew drive or winch needs its own design and acceptance for loads, braking and control. The motor’s performance result is one input to that work.
Ask for a test tied to your unit
- Connect documents to the unit. Full code, drawing or specification revision, and identification of the delivered configuration.
- Agree performance conditions. Operating points, fluid and temperature, instrumentation and acceptance criteria. Ask whether the data is representative family data or a test of the actual unit.
- Cover the transients. Ask separately about starting, transient behaviour and external loads. Steady-state curves leave these out unless LSWR states otherwise.
- Keep service running. Get installation, maintenance and parts identification documents, warranty and remedy terms, and approval rights over design or material changes.
ISO 4409 covers steady-state performance testing and presentation for hydraulic pumps, motors and transmissions. [4] Use it to frame the test you request. Ask LSWR to state in writing which tests it ran on your unit and which certificates, if any, apply to it.
Quotation brief for a QJM motor
Ask LSWR to confirm in writing: one full model code, a controlled drawing with differences from your existing unit marked, performance data and test conditions for that variant, plus lead time, warranty cover and how design changes get approved.
Sources & review
- LSWR company introduction ↗
Describes QJM as a radial steel-ball motor and lists BM, JMDG and NGM motors and drive assemblies alongside it.
2026-10-11 - LSWR QJM catalogue ↗
QJM entries listed by application, with no numerical model selection table.
2026-10-11 - LSWR marine motor entry in the QJM category ↗
2023 entry with title and illustration. It gives no displacement, pressure, torque, speed or dimension table.
2026-10-11 - ISO 4409:2019 scope ↗
Steady-state performance testing and presentation for hydraulic pumps, motors and transmissions. Useful wording for a test request.
2026-10-11
Specifications come from the manufacturer’s published information and the sources above; buying advice is written by CivilEquip with AI assistance. Ask the manufacturer to confirm the data for your configuration. Editorial policy · Report a correction.