Cattini Oleopneumatica YAK 312 Manual Uso Y Manutención página 17

EN
PROBLEMS
Solutions
THE MOTOR WILL NOT START, OR IT RUNS BADLY.
- Check that the air supply line is not choked. - The seals (1101) are worn, replace them! - The seals
(1101) fitted on the piston (1102) have difficulty in sliding: both the cylinder and the ram have to be
dismantled and lubricated.
THE JACK DOES NOT LIFT THE LOAD.
- Check the oil level by means of the screw (1401). - There is dirt underneath the valves : remove the
casing, close the tap 843, turn the jack over so the cylinder is horizontal and the motor pump vertical,
loosen the cap (518), remove the bearings and springs and blow inside to thoroughly clean it. Next,
reassemble and if necessary knock the bearings again (40) and (521), repeat the bleeding operation
illustrated on the previous page and put the jack back into its normal position and reopen the tap. - Check
the hydraulic block (1152), paying special attention that the pistons (89) and (264), which control opening
and closing of the descent valves, have not become rigid, in which case dismantle them and grease them.
THE JACK LIFTS, BUT COMES DOWN UNDER THE LOAD.
- Dismantle the assembly (1152) and check that under the valves (40) and (83) there are no impurities,
then, after carefully cleaning, readapt the pin (83) in its seat with a light blow with a hammer. If it is not
possible to obtain a seal on the pin, replace the valve (KIT0265) complete with the pin (83). If the load still
falls even after fitting the jack, carry out the following step. - Completely drain the tank and the cylinder of
oil, loosen the cylinder and check the washer (210); if it is damaged, replace it. Refit everything and
tighten the cylinder. 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 LEVER IN THE DESCENT
POSITION.
Check the suction-pump (935) and check that the piston (130) slides well: it is a good idea to grease or
lubricate it; unscrew and, if necessary, clean the silencer (267), then screw it back down.
OIL LEAKS
- If the jack expels oil from the silencer (1109), it means: the pumping element (1104) is scored or
damaged and must be replaced; the seal (1106) is worn and must be replaced. - Oil leaks from the suction
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