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Kongsberg Maritime AS

Kongsberg Maritime Kamewa Controllable Pitch Propeller

Name: Kongsberg Maritime AS Kongsberg Maritime Kamewa Controllable Pitch Propeller
Brand: Kongsberg Maritime AS
SKU: OSE-64550

A Kongsberg Maritime Kamewa Controllable Pitch Propeller (CPP) provides variable blade pitch to deliver thrust, allowing rapid reversal and fine speed control without changing shaft rotation direction.

Inspector Detail

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Common issues

Hub seal leakage allowing seawater ingress into the pitch mechanism oil
Blade seal / O-ring wear at the blade root leading to oil loss
Contamination of hub oil (water or metal particles) from worn seals
Pitch feedback (indicator) misalignment against actual blade angle
Oil distribution box (OD box) leakage at the shaft seal
Blade bolt corrosion or loosening over long service periods
Cavitation erosion on blade tips and leading edges

Inspection checklist

Take a hub oil sample and check for water content and metal particles
Check external hub seal and OD box for visible leaks or oil sheen in the water
Verify pitch indicator reading matches actual blade angle at set reference positions
Check servo oil system pressure and response time for pitch changes
Inspect blade surfaces for cavitation pitting, erosion or impact damage
Check blade bolt condition and torque where accessible
Inspect shaft coupling and stern tube seal condition
Confirm emergency/local pitch control operates correctly

Service intervals

Hub oil sample analysis	typically every 3-6 months or per class PMS
Hub oil change	per Kongsberg's schedule for the hub size fitted, commonly on a multi-year interval unless sample results dictate earlier change
Blade bolt torque check	at each drydock or per class-required interval
OD box seal inspection	annually or when leakage is observed

Typical wear limits

Blade bolt condition

reject on any visible corrosion pitting, thread damage or evidence of previous loosening - torque values are propeller-size specific, confirm against Kongsberg documentation

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

Hub seal kit
OD box shaft seal set
Blade O-ring / seal set
Blade bolts
Servo system filter elements

Safety

Hydraulic system holds stored pressure - isolate and depressurise before opening the servo or OD box
Underwater/blade work requires drydock or diving precautions with the shaft locked
Blade components are heavy - use proper lifting gear during removal
Loss of pitch control affects vessel manoeuvrability - always verify backup/manual control before relying on it operationally

Class survey

Propulsion shafting/CPP surveyed under class rules for tailshaft and propeller; hub oil condition monitoring can in some class systems support extended survey intervals. Seal integrity and pitch feedback calibration are typically checked at survey.

Estimated lifetime: CPP hub and blade service life is generally governed by drydock cycle and oil condition rather than running hours - internal examination of underwater parts is commonly tied to tailshaft/propeller survey intervals of roughly 2.5-5 years, not a fixed hour count.