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Users manual PITEBA oil expeller
1. Prior to first use
- Clean inside of press cage and the expeller screw with hot water and detergent.
- Mount the expeller with lockbolts and butterfly nuts on a vertical timber or directly on a sturdy table. Extraction of some seeds requires much power meaning the use of a very sturdy table or vertical timber.
- Slip the biggest washer over the shaft of the expeller screw and grease this washer immediately with some edible oil.
– Do not use any other oil! – This washer is exposed to very high pressure and should always be well greased.
- Insert expeller screw into the press cage.
- Turn the cap onto the presscage.
- Depending on the type of seed the adjustment bolt can be turned into the cap.
- Prepare a funnel by cutting a plastic soft drink bottle at 15 cm from the outlet. (The outside diameter of this outlet should be 28 mm).
- Slip crank over the expellershaft and fixate the crank with the small bolt and nut.
- Fill the glass container with lamp oil. The user should obey the instructions on the package of the lamp oil. Place the wick holder with the wick on top of the glass container. Place the glass container on the foot of the expeller under the chimney. Tighten the container with an elastic band over the 2 projections on the vertical. Always check the quality of the elastic band before use!
- Place a small container under the oil outlet or place a small funnel through the hole under the oil outlet and connect with a tube to a bucket. This means drilling a hole in the table to accommodate the funnel.
- The oil expeller is now ready for use.
- Seed should be well dried.
- Sift the seed through a fine sieve to remove sand
and through a coarse sieve to remove particles bigger than the seed
as straw and stones.
- Store well dried seed in
plastic bags or well closed drums
to avoid moisture attraction. Damp seed can not be expelled.
- Coarse seeds have to be broken
or ground. Do not prepare
more seed than can be processed the same day to avoid decay due to
attraction of moisture from the air.
3. Oil expelling
- Grease the washer at the end of
the expeller shaft with
edible oil. This is very important!
- Verify the use of the
adjustment bolt according to
the recommendation for the seed type. If the use of the adjustment bolt
is recommended: leave the 2 press cake outlets fully open. When the
press cake appears, the adjustment bolt can be tightened gradually to
obtain a good flow of the oil and increased pressure.
- Light the wick.
- Fill the funnel with seed.
- Wait 10 minutes to heat the
- Start turning the crank
- The press cake will appear
through the 2 holes in the cap.
In the beginning some seeds may appear. Lightly stop the seed
from appearing by use of your fingers.
- The oil will appear through the
oil slit in the presscage.
- Check regularly the flow of the
seed through the funnel. Use
a small wooden stick to break any bridge formation in the funnel.
or broken or angular seeds may lead to bridge formation.
- Clean the oil slit regularly
with a small knife to avoid
- Do not extinguish the flame
when pressing is resumed within
5 – 10 minutes. The press cake will remain plastic. In case
the interruption is longer, remove the cap and clean out the press cake
before the cap cools down.
4. The oil
- The warm oil runs during expelling from the press cagehead
to the oil outlet halfway the press cage.
- Collect the oil in a small cup or tin.
- Leave the oil at room temperature for a few hours so that
solids will settle. Oil with a high melting point, such as oil from
oilpalm kernel or coconut, should be kept hot or filtered immediately
- Decant the oil and keep it in a closed container in a dark
and cool place until used or sold.
- Important: never expel edible oil after expelling inedible
oil without cleaning the expeller very well.
- Indicate type and origin of the oil and date of expelling
the label of the container to keep track of oil stocks.
5. Press cake
- The press cake of most oil seeds is suitable as
animal feed (protein concentrate). Your extension officer can inform
- Do not add any oil to the press cake. Only presscake with a
low oil content is suitable as an animal feed.
- Store the press cake immediately in a plastic bag
or tightly closed drum to avoid spoilage by attraction of moisture.
6. After expelling
- Extinguish the burner.
- Remove and clean the cap at the
end of the press cage
immediately after expelling.
- If the cap is allowed to cool
down, the press cake becomes
hard like stone and is difficult to clean out.
- Expelling with the adjustment
bolt: remove the adjustment
bolt. Add some seed in the funnel. By turning the crank the press cake
will be pushed out of the cap. Clean the thread inside the cap with a
small knife without damaging the thread. When turning the adjustment
bolt in a dirty thread of the cap, you may crack the cast iron cap.
- Expelling without adjustment
bolt: remove the cap from the
press cage and clean the cap with a small knife without damaging the
thread. Clean the thread inside the cap with hot water.
- Forgotten to clean cap immediately after expelling:
The press cake ishard like stone and can not be removed
easily. Soak the cap for a few hours in hot water.
The press cake will soften and can be removed easily.
- Wipe the press cage and the
expeller screw with a slightly
- Pour the oil of the day in a closed container and place
the container in a warm place to allow any dirt to settle during 1–2 days.
Oil with a high melting point, such as from oil palm kernel, babasu or
coprah, should be kept quite warm to allow dirt to settle. Decant
the oil in a clean vessel for storage.
7. Questions and answers
- The expeller screw makes a scraping noise and turns difficultly.
Iron filings may be visible at the shaft near the press cage.
Stop turning the crank immediately. The washer at the end of the expeller shaft was not greased or is absent.
Expeller use without greasing the washer leads to excessive wear.
Remove the cap, remove the expeller screw from the presscage, remove any filings and grease the washer.
- The press cake is squeezed from the oil slit
The press cake runs backwards, because the 2 exits for the press cake in the cap are too small.
Release the adjustment bolt to allow a bigger opening for the press cake.
Seed may be toodamp and the press cake may run backwards. Dry the seed well.
- Oil appears with the press cake.
Reduce the exitopenings for the press cake.
The expeller may beoverheated. Reduce the flame of the burner by
reducing the wick protrudingabove the wick holder. In some cases no
flame is needed with a high ambienttemperature once expelling has
started with a preheated press cage.
- The expeller cage fills up with oil
The oil slit is blocked. Clean the oil slit with a knife.
The seed has a high oil content or is very small.
The oil has no time to run to the oilslit.
Turn the crank at a lower speed of about 45 rpm or less.
- Turning of the crank goes suddenly very lightly.
There is bridge formation in the funnel. This can be prevented by pushing
in the funnel with a small stick. Never put your finger or an iron rod
into the funnel.
- The adjustment bolt does not fit into the cap.
The thread inside the cap has not been cleaned properly. Clean the
thread inside the cap with hot water. Subsequently the adjustment bolt
can easily be mounted inside the cap.
- The expeller is too hot.
The heater has not been extinguished after expelling and the
expeller is overheated. Remove and clean the cap. Cool down the expeller
somewhat and continue expelling.
- The expeller is too cold.
The wick is too short. Extinguish the heater and pull the wick out
slightly and light the flame again. (Watch out: the wick holder is hot!)
The flame extinguished spontaneously. Fill the container with lamp oil
- Soot formation on the press cage.
The wick is too long. Extinguish the flame, remove the wick holder from
the bottle and pull the wick slightly downwards. The flame will now be
smaller and soot formation will stop.