Lewmar Ocean Hatch (Flat Base) (PDF)

FITTING INSTRUCTIONS

Cut-out, bedding and fastening for a Lewmar Ocean hatch, the hinge backing plates, everyday use and how to reset the friction levers when the lid will not hold its position.

DocumentLewmar Ocean Hatch (Flat Base) Fitting & Adjustment Instructions

FormatPDF · 2 pages · 0.1 MB

LanguageEnglish

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Standard Fitting Use & Care Products

Lewmar Ocean Hatch (Flat Base) — Fitting & Adjustment Instructions

Compliance

Ocean hatches are for all craft types in accordance with ISO/DIS 12216.2(E), design category "A", areas II, III and IV. Fitting vents or other modifications invalidates the compliance.

Cut-Out

Flat mounting surface within +/- 1mm; deck/hull thickness 25-70mm (flanged version only).
Keep fastenings clear of moulding radii and allow room for the lid to open. Don't work the lid until the lower frame is fixed.
Pencil round the inside edge of the lower frame; for hatches with a lower frame flange, enlarge the aperture by 3mm all round. The frame must sit square on the opening; make a template for several hatches.
Seal exposed laminate on composite decks; deburr metal decks. The hatch is not a stiffener: stiffen the deck against heavy-weather distortion.

Bedding & Fixing

Bedding compound in the lower frame channel: adhesive marine sealant (e.g. silicone), 3mm minimum thickness and compressible so the screws pull the frame down onto the deck.
Drill two holes in opposite corners first, then the rest, tightening from the centre out to the edges; clean off surplus sealant.
Wood decks: M5 through bolts or marine-grade wood screws. GRP / steel / alloy: M5 through bolts or machine screws into tapped plates.
Fixing sizes: M5, 10UNC, 2BA, 3/16", wood screws minimum 40mm long. Hinge fixings: M6 or 1/4" through bolts only.
Check the lid closes and locks with even seal pressure.

Catalogue no.	Hinge backing plate	Thread size
3669913999	Backing plate for through-bolting the hinge units	M6	Ask us to source it →
3669914999	Backing plate for through-bolting the hinge units	1/4" UNC	Ask us to source it →

Use & Care

Small vent hatches stop at 90 degrees: don't force them past the stop. Larger hatches are not self-supporting past vertical and will fall fully open.
Locked ventilation position: handles closed into the centre slot of the catch block. Don't stand on or load the lid in this position.
Wash with soap, water and a soft cloth; never abrasive or solvent cleaners on the acrylic.
Keep hands clear of the lever and lid pinch zones.

Friction Lever Adjustment

Levers are preset at the factory for correct positioning with minimum opening load.
Adjust with the socket head screws on each side of the lever: 4mm (5/32") hex key, about 1/8th of a turn clockwise to increase the holding force, easiest fully open or closed.
Don't overtighten. With several levers, set them all to a similar load.
Never lubricate the friction levers: it stops them working.

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.