Air Bleeding; Maintenance Reserved To A Professionally Qualified Engineer - Cattini Oleopneumatica YAK 2810 Manual Uso Y Manutención

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lowered. The oil level must be up to the small bolt that is at the front of the left tank and at the front of the right
tank, you can check by unscrewing one of the two bolts. If you have to top up the oil in the tank make certain
the oil you are using is compatible with what is already inside the tank so as not to compromise machine
integrity. DWG. 6
- If the oil inside the tank exceeds the level by a lot, it is advisable to remove some until it is back in the norm.

AIR BLEEDING

Each time the jack is serviced, removing and refitting parts connected to the tank and motorpump, it is
advisable to bleed off all air. Bleeding phases:
1. Check the oil with the piston completely lowered.
2. Move the piston out completely with the quick lifting function.
3. Loosen (NEVER unscrew the dowel completely!) dowel no. 0541 which is on the top of the second piston,
the widest, and let all the air out from the dowel, continuing until oil starts coming out and then close the dowel.
DWG. 7
4. Move the piston back in completely and check oil level.
5. Try to operate the jack without any load and if the piston lowers in jerks repeat the procedure at least 2 or 3
times.
MAINTENANCE RESERVED TO A PROFESSIONALLY QUALIFIED
ENGINEER
Having to carry out maintenance or overhauling, use exclusively genuine spare parts to ensure the utmost
reliability for the jack.
Before any maintenance operation on the jack, the supports 2254 have to be removed by loose- ning the
screws 0302 followed by the platform 2255 by loosening screws 2076, taking care not to lose the spacers 2257;
then remove the casing 2252, removing screws 0828 and 0301. Now all the parts of the jack can be easily
reached.
For quicker maintenance of the motorpump 2261 and hydraulic block 1152 they can both be deta- ched from
the jack without having to remove the oil from the pistons - even if they are raised - or from the tank. To do this,
proceed as follows: close tap 1164 that excludes the tank; move taps 2307 so they are horizontal, their job
being to exclude the cylinder; unscrew the oil pipe from the motor pump 1309, disconnect the air pipes and
lastly remove the fixing screws 1160.
Now all the units - 2261, 1152 and 2260 - can be serviced. With this operation, and if the motor- pump is
malfunctioning, it is possible to move only the faulty parts without having to move the whole jacking structure as
well which would be too costly. Once repairs have been done, repeat the instructions given above in the
reverse order, not forgetting to put the two taps 2307 in the ver- tical position and open tap 1164.
At the end of this it might be necessary to carry out the bleeding operation.
PROBLEMS
Solutions
THE MOTOR DOES NOT START
a) Check that the air supply line is not choked, and that the manometer 2270 placed on the control console
detects at least 8.5 bar. b) If possible, supply the jack with the greatest possible pressure (max 15 bar) and try
switching the motor on a few times. It could happen, in fact, that after a long period of inactivity, the seal 0757
tends to stick to the head 1100.
THE MOTOR RUNS BADLY
THE MOTOR RUNS BADLY a) The seals (1101) are worn, replace them! b) The seals (1101) on the piston
(1102) slide with difficulty: both the cylinder and piston must be removed and lubricated. c) Seal 0762 is
damaged and needs to be replaced.
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