Operating Instructions for Suspended Jacks
18
7.7 Changing the Hydraulic Oil
An oil change requires:
• Collection receptacle for the hydraulic oil
• Hydraulic oil, class HLP, viscosity ISO-VG 22 (HLP 22).
• Information concerning the oil quantity. ( 3)
• New sealing rings. ( 11)
Hydraulic oil load stroke
Retract piston rod [10] completely.
Disconnect the jack from the compressed air supply or from the electrical mains.
Remove oil drain plug of load stroke [5] and drain the hydraulic oil.
Reinstall the oil drain plug with a new O-ring.
Remove oil dip stick of load stroke [7] and fill in new hydraulic oil up to the mark.
Reinstall the dip stick with a new O-ring.
Hydraulic oil retrieval
Extend piston rod [10] completely.
Disconnect the jack from the compressed air supply or from the electrical mains.
Remove oil drain plug retrieval [8] and drain hydraulic oil.
Reinstall the oil drain plug.
Remove oil dip stick retrieval [9] and fill in new hydraulic oil up to the mark.
Reinstall the dip stick with a new O-ring.
Bleed the jack after changing the oil. ( 7.10)
7.8 Replace Hydraulic Hoses
Retract piston rod [10] completely.
Disconnect the jack from electrical mains.
Remove ventilation screw and attach the closure D. ( 4.1)
Remove tilt protection bracket [1], remove lifting cylinder and lay horizontally.
Remove cover [11] and disconnect hydraulic hoses.
Install new hydraulic hoses. (11)
Insert lifting cylinder into the undercarriage and replace the tilt protection brackets on both sides.
Remove closure D and check the hydraulic oil level of the load stroke. ( 7.5)
Reinstall ventilation screw and bleed jack. ( 7.10)
7.9 Drain the Condensate
Condensate (water) may enter the hydraulic system with compressed air.
The oil level rises and oil may escape at the control.
Required to drain the condensate:
• Collection receptacle for the hydraulic oil
Remove oil drain plug of load stroke [5] until an oil-water mixture emerges.
As soon as pure hydraulic oil emerges, reinstall the oil drain plug.
Check hydraulic oil level of load stroke. ( 7.5)
7.10 Bleed the Jack
Press manual pump [4] approx. 5 to 10 times and at the same time actuate drain valve [3].
Extend and retract piston rod [10] completely.
Repeat the process as needed.
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