CLAS OH 9030, Manual

Bleeding phases type 2:

1. The piston must be moved out completely.

2. Turn the jack over on the piston, levering with the handle as illustrated 

in the fi gure. DWG. 16

3. Start the lowering function until the piston moves back in properly.

4. Put the jack back into the working position.

5. Move the piston back in completely and check the oil level.

6. Try to operate the jack without any load and if the piston lowers in jerks 

repeat the procedure at least 2 or 3 times.

PROBLEMS

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 seals are worn, replace them! 

- The seals fi tted on the piston have diffi culty 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. 

- 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. Next, reassemble and if necessary knock the bearings, 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, paying special attention that the pistons, 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 and check that under the valves there are no impurities, then, after carefully cleaning, 

readapt the pin 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 complete with the pin. If the load still falls even after fi tting the jack, carry out the following step. 

- Completely drain the tank and the cylinder of oil, loosen the cylinder and check the washer; if it is damaged, 

replace it. Refi t 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 and check that the piston slides well: it is a good idea to grease or lubricate it; unscrew 

and, if necessary, clean the silencer, then screw it back down.

 OH  9030 

 HIGH LIFT AIR HYDRAULIC  JACK 30T