USAG 2500 Manual Original página 9

Symptom
Jack cannot lift load or pump feels spongy
Jack lift load, but cannot hold
Jack can not lower completely
Jack cannot reach maximum height
GUARANTEE : See the general conditions in the USAG catalogue or the USAG price list.
Subject to compliance with all of the above instructions.
MAINTENANCE
Important: Both the maintenance and repair of the jack may only be performed by qualified persons, who have sufficient knowledge of the hydraulic systems used in these devices as a
result of their training and experience.
When the jack is no longer used, maintain it in the lower position. Keep the jack and handles clean. Lubricate moving parts regularly.
- If the oil level needs to be checked or refilled, with the piston fully retracted, remove the filler plug and drain its contents into a container. With the jack in a horizontal position, proceed to introduce the
necessary volume as indicated for each model in these instructions. The parts table alongside shows the volume of oil required; Make sure that no dirt enters with the new oil.
Following a period of prolonged intensive use, it is recommendable to change the oil in order to extend the useful life of the jack.
Important: An excess of oil to the volume required may render the jack inoperative.
- Only use hydraulic oil, type HL or HM, with an ISO grade of cinematic viscosity of 30 cST at 40º, or an Engler viscosity of 3 at 50ºC.
Extremely Important: Never use brake fluid.
- The supply hoses are an essential part. Therefore, must not be damaged twisted or worn. Do not place any load underneath them or place them near sources or hit. For the equipment to work correctly or to
avoid the breakage, the hoses must be in as straight a position as possible, with no kinks, bends or sharp angles. Also check that their connections are in a good condition. Never disconnect a hose without having
previously depressurized the system.
- Only original spare parts should be used.
- When the jack is not in use, make sure the lifting arm is fully retracted to avoid corrosion. Apply an anti-corrosion product to the pistons, if appropriate.
- Keep the jack in a clean, dry place and out of children reach.
- At the end of the useful life of the jack, drain off the oil and hand it over to an authorised agent and dispose of the jack in accordance with local regulations.
- Both the repair kit, which exclusively contains the o-rings and seals of the jack, and the spare part sets must be ordered using the reference assigned in the table.
Possible Causes
Air-bound
Low oil level
Power unit malfunctioning
Low oil level
Power unit malfunctioning
Air-bound
Low oil level
Power unit malfunctioning
Air-bound
Low oil level
Remedies
Bleed hydraulic system
Add oil
Replace
Add oil
Replace
Bleed hydraulic system
Add oil
Replace
Bleed hydraulic system
Add oil