Cattini YAK 221/N Mode D'emploi page 17

EN
A00423 A00423 , then repeat the bleeding operation illustrated on the previous page. Put the jack back into its normal position
and reopen the tap.
- Check the hydraulic block
drawing which controls opening and closing of the descent valve pos.7 of the A00324 exploded drawing, has not
become rigid, in which case dismantle and grease it.
THE JACK LIFTS, BUT COMES DOWN UNDER THE LOAD.
- Dismantle the assembly
After carefully cleaning, readapt the pin
even after fitting the jack, carry out the following step. - There is dirt underneath the valves: remove the casing, close
the tap POS. 9 A00543 POS. 9 A00543
POS.16 A00423 POS.16 A00423 , remove the bearings and springs and blow inside to thoroughly clean it. Reassemble and if
necessary knock again the bearings
the previous page. Put the jack back into its normal position and reopen the tap.
- Completely drain the tank and the cylinder of oil, loosen the cylinder and check the washer
damaged, replace it. Refit everything being careful not to let the replaced seal fall between cylinder and base. Fill the
oil tank with oil to the required level; operate the jack a couple of times without the load; bleed and then top up the oil
level when the pistons are lowered.
THE RAMS FAIL TO GO BACK IN COMPLETELY EVEN WITH THE CONTROLS IN DESCENT
POSITION.
Check the suction-pump
- Check the head, POS. 19 A00423 POS. 19 A00423
OIL LEAKS FROM THE SILENCER
- Check that the pumping element pos. 11 of the A00423 exploded drawing is not scored or damaged. If it is, replace
it.
- Check that the seals,
OIL LEAKS FROM THE SUCTION PUMP
1. Check the quantity of oil in the tank, (see the "Oil level check" procedure in the "Maintenance for the end user"
section). If too much oil has been put in the jack, it will stop leaking very soon.
2. Check that the jack has been used observing the conditions listed previously, i.e. horizontally and not slanted. If the
jack has been turned upside down or tipped over, it will stop leaking very soon.
THE PISTONS ARE VERY SLOW TO MOVE UP
- Check that the tap, POS. 9 A00543 POS. 9 A00543
- If the jack malfunctions when moving up, check the spring
POS. 2 A00543 POS. 2 A00543 , paying special attention that the piston pos.4 of the A00324 exploded
POS. 2 A00543 POS. 2 A00543 and check that under the bearing
POS.7 A00324 POS.7 A00324
, turn the jack over so the cylinder is horizontal and the motor pump vertical, loosen the cap
POS.12 AND POS.14 A00423 POS.12 AND POS.14 A00423
: remove it and clean it thoroughly.
POS. 22 A00423 POS. 22 A00423
, remove it and clean it thoroughly.
POS. 3 A00423 POS. 3 A00423
POS. 5,6,9 A00423 POS. 5,6,9 A00423 are not worn. If they are, replace them.
, located between the tank and motor pump is open.
POS.7 A00324 POS.7 A00324
in its seat with a light blow with a hammer. If the load still falls
, then repeat the bleeding operation illustrated on
POS. 22 A00423 POS. 22 A00423
POS. 17 A00423 POS. 17 A00423 .
there are no impurities.
POS. 7 A00367 POS. 7 A00367 . If it is
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