CLAS OH 9040 Guia Del Usuario página 14

OH 9040
5. Let all the air out from the dowel and continue until oil starts coming through and then close the dowel.
6. Put the jack back into the working position.
7. Open the cock.
8. Move the pistons back in completely and check oil level.
9. Try to operate the jack without any load and if the piston lowers in jerks repeat the procedure at least 2 or 3
times.
Having to carry out maintenance or overhauling, use exclusively genuine spare parts to ensure the utmost reliability
for the jack.
The motor will not start, or it runs badly
- Check that the air supply line is not choked.
- The outside seals tted on the piston are worn. Replace them and lubricate both the cylinder and the ram.
The jack does not lift the load
- Check that the tap is open.
- Check the oil level by means of the screw on the tank.
- There is dirt underneath the valves: remove the casing, close the tap, turn the jack over so the cylinder is horizontal
and the motor pump vertical, loosen the cap, remove the bearings and springs and blow inside to thoroughly clean
it. Reassemble and if necessary knock again the bearings, 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, paying special attention that the piston which controls opening and closing of the
descent valve, has not become rigid, in which case dismantle and grease it.
The jack lifts, but comes down under the load
- Dismantle the assembly and check that under the bearing there are no impurities. After carefully cleaning, readapt
the pin in its seat with a light blow with a hammer. If the load still falls even after tting the jack, carry out the
following step.
- There is dirt underneath the valves: remove the casing, close the tap turn the jack over so the cylinder is horizontal
and the motor pump vertical, loosen the cap, remove the bearings and springs and blow inside to thoroughly clean
it. Reassemble and if necessary knock again the bearings, then repeat the bleeding operation illustrated on
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. If it is damaged,
replace it. Re t 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 lever in the descent position
- Check the suction-pump: remove it and clean it thoroughly.
- Check the head, remove it and clean it thoroughly.
Oil leaks from the silencer
- Check that the pumping element is not scored or damaged. If it is, replace it.
- Check that the seals, are not worn. If they are, replace them.
AIR HYDRAULIC JACK 20/40T
PROBLEMS