Azimuth Thrusters Parts
Select a manufacturer and model to inquire about specific parts.
9 manufacturers · 35 models available · All on request
Understanding azimuth thrusters
How azimuth thrusters work — and what we supply
Azimuth thrusters are 360°-steerable propulsion units (Z-drive or L-drive) that combine propulsion and steering in a single unit, so the whole drive rotates to direct thrust wherever it is needed. That makes them the standard choice on tugs, offshore supply vessels, ferries and dynamic-positioning vessels, where precise low-speed control and full directional thrust are essential.
Exakt supplies and overhauls the wear-critical components — upper and lower gears, slew (steering) bearings, propeller-shaft and steering seals, couplings and propellers — and coordinates full unit overhauls. We keep azimuth-thruster parts moving so your unit returns to service aligned, sealed and ready for duty.
As a Dubai-based marine service company, Exakt brings parts distribution, workshop and on-board service, and on-site installation together under one roof — sourced from our global OEM network and backed by 24/7 technical support.
Request a quote for any azimuth thrusters part on request.
Request a quoteZ-drive and L-drive arrangements
Azimuth thrusters are built in two layouts. A Z-drive takes horizontal engine output through an upper gearbox, down a vertical shaft, and through a lower gearbox to the propeller — two right-angle turns, hence the name. An L-drive takes vertical input from a motor mounted directly above the unit, so only the lower gear turns the drive through ninety degrees.
L-drives are common on diesel-electric and DP vessels where an electric motor sits directly above the thruster. Z-drives remain the norm where a diesel engine drives the unit through a horizontal shaft, as on most conventional tugs. The distinction matters when ordering: upper gear components, input couplings and the vertical shaft arrangement differ entirely between the two.
Units are further divided into fixed-pitch and controllable-pitch, and into in-hull and underwater-mountable designs. Underwater-mountable units can be exchanged afloat by divers, which changes the whole economics of a major failure and is worth confirming before planning a repair.
The wear-critical components
Across makes and sizes, the same short list accounts for most azimuth thruster parts enquiries.
- Upper and lower bevel gear sets, and their bearings
- Slew (steering) bearing and slew gear, including the sealing arrangement
- Propeller shaft seals and steering tube seals — the units' most frequent single part requirement
- Vertical shaft, couplings and coupling bolts
- Steering hydraulic components: motors, pumps, valves and rotary unions
- Propeller, nozzle and, on CPP units, hub and blade sealing components
- Lubricating oil system components — pumps, coolers, filters, level and temperature sensors
Why oil analysis is the first diagnostic
An azimuth thruster lower gear is a sealed, submerged gearbox that cannot be inspected without a docking or a diver. Its oil is the only continuously available evidence of what is happening inside, which makes trended oil analysis disproportionately valuable on these units compared with machinery you can open.
Two parameters carry most of the signal. Water content indicates seal condition: a rising trend means the propeller shaft or steering tube seals are passing. Ferrous particle count indicates gear and bearing condition: a step change after a grounding or a rope strike usually means mechanical damage rather than gradual wear.
A single sample is close to useless for decision-making. Three or more samples at consistent intervals, from the same sampling point, are what turn oil analysis into a maintenance trigger rather than a number in a file.
Common azimuth thruster failure modes
What tends to bring an azimuth thruster enquiry to us, and what the symptom usually indicates. Send the symptom with the enquiry — it frequently changes which parts are actually needed.
Water in the lower gear oil
Propeller shaft seal or steering tube seal wear, or damage from rope or netting. Emulsified oil means it has been present for some time and the bearings should be assessed, not just the seals.
Rising ferrous content in oil analysis
Bevel gear or bearing wear. A gradual rise is normal ageing; a step change usually follows a shock load such as a grounding, ice contact or a rope strike.
Slow or uneven steering response
Steering hydraulic pressure loss, filter blockage, worn slew gear, or a failing proportional valve. On twin installations, comparing port and starboard response isolates the fault quickly.
Noise or vibration at specific headings
Slew bearing wear, or a damaged propeller or nozzle. Heading dependence points to the steering path rather than the drive train.
Oil loss with no visible internal water ingress
Seal wear leaking outward, or a failed static seal at a housing joint. On an oil-to-sea interface this is also a pollution exposure, not only a maintenance item.
Steering angle feedback mismatch
Feedback transmitter fault, linkage wear, or a slipped encoder. The bridge indication and actual thrust direction diverge, which matters most in DP operation.
Lower gear running hot
Low oil level, cooler fouling, degraded oil, or early bearing distress. Establish whether the temperature rise tracks load or is present at idle before opening anything.
What to send when enquiring for azimuth thruster parts
Azimuth thruster components are specific to the make, the size and frequently the build. These ten lines are what let us identify a part rather than guess at one.
- Thruster maker and type designation, exactly as on the unit data plate
- Serial number of the unit
- Z-drive or L-drive, and fixed or controllable pitch
- Input power and the vessel's duty — tug, OSV, ferry, DP
- Running hours, and hours since the last overhaul
- The symptom, and when it started
- Recent oil analysis reports, ideally the last three
- Photographs of the data plate and of the component concerned
- Maker drawing or part number if the documentation is on board
- Port, delivery window, and whether the work is afloat or in dock