Annual Maintenance - Lewmar 140 Product And Installation Manual

GB
6 Maintenance

Annual Maintenance

1. Clean thruster and tunnel as necessary.
2. Replace anode if necessary.
3. Check that all nuts and bolts are tight.
4. Check that the battery cables are still firmly connected.
5. Run the bowthruster up and down and check that everything is moving freely.
6. Check that the connectors are not corroded.
7. Inspect the rubber bellows in the bowthruster articulation. Replace if necessary. The manufacturer recom-
mends replacement every 5 years. ONLY FOR LEWMAR 250 AND ALL RMC BRANDED THRUSTERS
Other Maintenance
Replacement of the drive shear pin on models 140 and 185 only. The shear pin is located below the electric
motor. Remove the electric motor, replace the shear pin and fit a new cable tie to lock the shear pin. Refit the
electric motor.
Replacement of the actuator shear pin. Deploy the bowthruster and switch off the electrical power before the
bowthruster is fully extended. This reduces the load on the shear pin. Remove the shear pin and fit the new one.
Reconnect the power and run the bowthruster up and down.
Replacement of Rubber Bellows (Lewmar 250 And RMC Branded
Thrusters Only)
The rubber bellows must be replaced every 5 years.
1. Remove the drive motor by unscrewing the 4 screws.
2. Unscrew the central nut.
3. Unscrew the hexagonal screw on the upper side of the motor yoke.
4. Deploy the thruster with the actuator.
5. Slacken the two hose-clips and lower the hatch, pipe and the support-
ing arm as one unit.
6. Unscrew the eight M6 nuts on the inside of the ring fastener. A support
will then be needed on the outside.
7. Lift off the ring fastener.
8. Take out the old bellows and fit the new one.
9. Place the ring fastener over the rubber bellow, so that the bellows sits
correctly in the ring profile. Attach nuts and washers. If the screws were
removed, new sealant (butyl) must be applied under the washers on the
outside.
10. Apply a little grease to the threads on the supporting arm, thread on
the hose-clips and locate them so that they can be tightened.
11. Pass the supporting arm through the bellows and the motor yoke, and
fit the central nut.
12. Tighten the hose-clips round the supporting arm.
13. Retract the thruster and tighten the hexagonal screw on the motor sup-
porting arm. Use Loctite.
14. Refit the drive motor.
15. Test run the up/down function.
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