4.7 Maintenance instructions for hydraulic system
WARNING
Do not use unskilled personnel for hydraulic system maintenance
Risk of injury and damage to property!
Take the following precautions:
❒ Only allow trained professionals to carry out servicing and maintenance work
on the hydraulic system. Follow the manufacturer's operating instructions.
NOTICE! Do not allow the oil temperature to 50°C or fall below -30°C.
The interval at which oil should be changed depends on a variety of factors including
the age of the oil and the amount of dirt contained in it. As a general rule, the oil
should be changed at the following intervals:
Interval [service hours]
Component / Maintenance Operation
50 – 100
ONE-TIME maintenance after first commissioning:
❒ Change the oil and the filter
50
❒ Check the oil level
➥ The oil must show no visible signs of foaming
❒ Check the tightness of screw connectors
200
❒ Check the return filter for dirt (pressure gauge on filter)
❒ Change the filter cartridge if necessary
5,000 (or yearly)
❒ Change the oil
❒ Change the return filter and the vent filter sets
Recommended procedure for oil change:
❒ Move all hydraulic cylinders to the end stop
➥ This will expel all the oil
❒ Drain off or pump off the oil from the hydraulic unit
❒ Remove the unit cover or open the inspection cover
❒ Thoroughly clean the oil tank (make sure you remove all oil sludge)
❒ Change the return filter and the vent filter sets
❒ Refit the unit cover or close the inspection cover
❒ Fill the tank with hydraulic oil to the level mark shown on the inspection glass
☞ Use the hydraulic oil grade specified by the manufacturer
❒ At the other end of the cylinder plunger (relative to its current position), remove the
hydraulic cylinder hose fitted to the fixed piping side.
❒ Using the hydraulic unit move the cylinders to the other end position
➥ The remaining old oil will be pushed out of the hose and into the container
❒ Refit the hydraulic hoses and check the seal
❒ Bleed the hydraulic system and check the oil level
NOTICE! Dispose of hydraulic oil in accordance with local regulations!
4
Servicing
Maintenance instructions for hydraulic system
54
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
