"Bij hydrolieksystemen, tandwielkasten en ankerlieroliekasten meet je het oliepeil met behulp van ronde controleglaasjes"

.... the oil level is checked using round sight glasses.

Het probleem met die "oliekasten" is dat het informele taal is.
In feite zijn die "oliekasten" tandwielkasten (gearboxes/cases) waar olie in zit. En die tandwielen draaien (gedeeltelijk) in die olie.

controleglaasje = sight glass / sight gauge

HRC10
Rope/Chain Windlass

Check level of oil in gearbox using the sight glass (3). Oil level (4) should be above ½ and no more than ¾ full. If necessary top up.

http://tinyurl.com/km8e4jd

ITEM – REMOVE STARBOARD ANCHOR WINDLASS GEARBOX AND REPLACE WITH NEW GOVERNMENT FURNISHED GEARBOX

3.4.4 Prior to conducting any testing and in the presence of the CG Inspector, ensure that the gearbox gear oil sump is completely filled with EP 90 Oil, MIL-L-2105-C IAW 2.1.g ( found on page 5-69). Pull out the lower and middle inspection plugs to ensure oil is present. Fill gear box sump until sight glass reads full.

http://tinyurl.com/jvn2ypv

Reduction gear is lubricated by oil sump while main shaft and other sliding surfaces are grease lubricated.
The basic equations of anchor windlass are:

http://tinyurl.com/o7w58ow

If you want that new windlass on your Beneteau sail boat to last more than a few seasons then following a few basic maintenance tasks is good insurance.

Always wash the unit down in fresh water to reduce corrosion. Where there is an oil sump, check it for correct level, and also check oil for water contamination.

http://tinyurl.com/pcn3qvc

Item Sl. No. EM-05;- Ford. Anchor Windlass & Towing Winch :
Make – Bhawani Engineering Works;

Type – Electro Hydraulic, Double Gypsy, Double Warp with tow rope drum at the center.
Windlass to be dismantled to the extent of special survey after draining out the sump oil, gear box to clean. Oil level indicator sight glass to be made visible or renewed as required. Surveyors’ Recommendations to be complied with.
After all necessary repairs/overhauling/renewal/gear case
inspection gear box sump oil to be renewed (Ship’s supply). Complete system to be reassembled with new Gaskets/Brake lining/ Joints /locking pins/oil seals/bearings/nuts & bolts.

http://tinyurl.com/oartlqr

Maxwell Vertical Windlass

The VW Vertical Windlass Series of anchor winches are designed for traditional rope and chain combination anchor rodes, where manual transfer of the rode from the rope warping drum to the chainwheel is required.

PLEASE SPECIFY WHAT CHAIN YOU ARE USING

FEATURES:
- Oil level sight glass/drain plug for inspection and convenient gearbox oil change

http://tinyurl.com/mzs2gmo

Marin, does your Lofran have the round sight glass to check the oil level for the winch gears. Your unit is much newer than mine I think, and I wonder how much they have changed the design over the years.

http://tinyurl.com/n4nal9a

Another example is the oil pan of an engine. The oil is used to lubricate the engine's moving parts and it pools in a reservoir, known as a sump, at the bottom of the engine. Use of a sump requires the engine to be mounted slightly higher to make space for it. Often though, oil in the sump can surge during hard cornering starving the oil pump. For these reasons racing and piston aircraft engines are "dry sumped" using scavenge pumps and a swirl tank to separate oil from air which is also sucked up by the pumps.

http://en.wikipedia.org/wiki/Sump

oil sump / oil pan / sump - oliekarter / oliepan / oliecarter

http://tinyurl.com/mbfhogr