A gearless elevator uses a traction machine whose motor drives the sheave directly, without an intervening gearbox. For a building owner, the useful decision is how the complete elevator serves occupants today and which changes will improve reliability, access and passenger service.
This guide explains the system and helps owners and property managers prepare a modernization brief. Gather equipment records, maintenance history, inspection findings and examples of service problems. An elevator consultant or qualified design professional can turn those records into a condition assessment and project-specific scope.
How gearless traction fits into the elevator
In a traction elevator, suspension ropes or belts run over a driven sheave and connect the car and counterweight through the system's roping arrangement. The motor turns the sheave; traction between the suspension members and sheave transmits motion. A geared machine uses a gearbox between motor and sheave. A gearless machine directly combines the motor and traction sheave.
Otis's elevator safety-chain illustration identifies the gearless machine, brake, controller and other protective systems. It shows why the drive is one part of a coordinated installation. Equipment selection and changes to that installation need an engineering assessment of the complete system.
Gearless describes the drive arrangement. Machine-room-less (MRL) describes where equipment is accommodated. KONE's description of its MRL traction elevators explains the use of shaft space for machinery, while Otis's Elevonic R modernization system includes geared or gearless solutions for existing machine rooms. Ask for the proposed equipment layout, access and clearances; a gearless conversion alone does not establish that a machine room can be removed.
Likewise, regenerative drives and permanent-magnet motors are features to identify in the quoted system. If energy savings form part of the proposal, request the baseline, operating assumptions, measurement boundary and proposed verification method. Motor power alone cannot establish annual building energy savings.
Define the passenger service you want to improve
Record complaints in observable terms: long morning queues, repeated door reopening, inconsistent stopping at floors, unavailable cars or difficulty using controls. Keep dates, times, floors and outage durations so the service provider can investigate patterns. Avoid assigning a mechanical cause from the symptom alone.
Travel speed is only one input to service. A passenger waits for a car, boards through the doors, travels with possible intermediate stops and exits. A useful assessment considers car capacity, number of cars, door operation, dispatching, acceleration and the traffic pattern together.
- Waiting time: define the start and end events, such as registering a call and the assigned car becoming available to board.
- Time to destination: define whether the reported measure includes waiting, boarding and intermediate stops.
- Availability: define the required service hours, which cars are counted and how planned outages are treated.
- Demand: record when and where people arrive, including deliveries, visitors and occupants using mobility aids.
KONE's monitoring documentation lists reports for calls, availability, waiting time and time to destination. These are useful examples of distinct measures to request; confirm what the existing controls can actually record and how each field is defined.
Agree on representative traffic scenarios with the consultant: a residential morning departure, office arrival peak, hospital movement or mixed-use lunch period can produce different priorities. Ask for assumptions and results for your building, including the conditions during a phased outage.
Compare scopes by what changes and what remains
Start with a condition survey and the building's intended future use. Make a component schedule that marks each item as retain, repair, replace or investigate. Require a reason, a responsible party and compatibility evidence for retained equipment.
Manufacturers offer different levels of intervention. For example, Otis's modernization overview distinguishes a controls-and-fixtures package from a package that also replaces the traction system. Use that distinction to compare the actual contents of proposals.
On a narrow screen, scroll the table sideways; keyboard users can focus the table region and use the arrow keys.
| Approach | When to investigate it | Evidence to request |
|---|---|---|
| Focused repairs or upgrades | A defined fault or service issue, with otherwise supportable equipment | Diagnosis, remaining condition, parts availability and how the intervention addresses the measured problem |
| Controls, drives, doors or fixtures | Reliability, dispatching, door performance or user-interface needs | Exact component list, interfaces, retained equipment compatibility and commissioning plan |
| Traction-system modernization | Machine condition, support limitations or a substantiated performance objective | Engineering review of machine, brake, suspension arrangement, supports, electrical supply and clearances |
| Comprehensive replacement | Several major limitations or a changed building use that warrants a broader study | Feasibility in the existing shaft, construction interfaces, access implications, outage plan and lifecycle comparison |
Price the surrounding work explicitly: electrical supply, cooling or ventilation, fire-alarm interfaces, communications, building finishes, structural work and inspections may involve other trades. Ask who designs, supplies, coordinates and accepts each interface. The facade coordination guide uses a similar responsibility-matrix approach for another building system.
Compare future service arrangements too: access to documentation and diagnostics, software or connectivity charges, supported replacement parts, response coverage, warranty exclusions and maintenance pricing. Ask how an owner can retrieve service records and what support is available after the initial contract.
Example: a queue needs a diagnosis before a faster machine
Make the conclusion traceable: connect every proposed change to a condition finding, code requirement or agreed service objective. Keep optional appearance upgrades visible as separate choices so they can be assessed alongside operational work.
Plan outages, accessibility and approvals before ordering
For projects in North America, ASME A17.1/CSA B44 covers elevator installation, operation, maintenance, alteration and related work. The ASME A17 standards overview also identifies A17.3 for existing elevators. Have the project professional establish the locally adopted editions, amendments and requirements triggered by the proposed work; the newest published edition alone is not a project approval.
For U.S. accessibility planning, the U.S. Access Board's elevator guide covers landing controls, signals, doors, car features and alterations. Ask the designer to document the applicable requirements and any existing-condition provisions for the scope. A new cab interior leaves questions about controls, entrances and access to the elevator that still need review.
Confirm local filings, inspections, testing, notices and return-to-service conditions with the responsible elevator authority. For example, New York City's owner guidance addresses modernization notices, maintenance records and permit responsibilities. It illustrates the administrative work to plan; its requirements apply to NYC, so use the equivalent authority for another location.
- Set service priorities. Identify residents or operations dependent on elevator access, delivery needs and the limits of remaining capacity.
- Agree on phasing. Obtain a sequence for each car, with dependencies, inspections and a contingency if the remaining elevator fails.
- Plan access during the outage. Coordinate with occupants and the design team on appropriate accommodations and building operations before fixing dates.
- Define the schedule milestones. Distinguish design approval, manufacturing, site readiness, installation, testing and authorization to return to service.
- Name the coordinator. Assign notices, trade interfaces, inspection bookings, issue tracking and occupant updates to specific people.
Verify the handover against the agreed brief
Before contract award, define how compliance and promised service outcomes will be checked. Required inspections and acceptance tests belong to the appropriately qualified parties. Owner review should also confirm that records, training, support and unresolved items are complete.
- Approved drawings, the installed component schedule and records of retained equipment.
- Required inspection/test reports, approvals and any outstanding conditions.
- Operating information, maintenance documentation, service contacts and the authorized fault-reporting process.
- Warranty dates, support arrangements, communications subscriptions and record access.
- A follow-up review of availability, complaints and agreed traffic measures under comparable operating conditions.
Use the editable elevator-modernization brief to gather the baseline, compare scope and allocate delivery responsibilities. Ask the consultant to resolve unknowns before inviting final prices. Keep physical inspection, adjustment and rescue procedures with trained elevator professionals.