8.7. Bleeding air from the hydraulic system
Bleed the air from the hydraulic system:
• after changing the hydraulic oil
• after working on the hydraulic system
• if your crane works slowly or jerkily
• if your crane has not been used for a long time
WARNING
Air in the hydraulic system can lead to faults and damage
To bleed the air from the hydraulic system, proceed as follows:
1.
Slowly extend and retract each stabiliser extension to its end position at least two times.
2.
Slowly extend and retract each stabiliser leg to its end position at least two times.
3.
Set stabiliser system in working position and operate the crane out of parked position.
4.
Slew the crane slowly.
• If your crane has a rack-and-pinion slewing system, slew the crane in each direction to the
slewing stop at least twice.
• If your crane has a continuous slewing system, slew at least two complete rotations.
5.
Slowly raise and lower the 1st and the 2nd boom to its end position at least twice.
6.
If the crane is equipped with JIB, slowly raise and lower the JIB at least twice with main boom
system pointing downwards and upwards.
7.
Slowly extend and retract the boom extensions to their end position at least twice.
a.
If your crane is equipped with JIB, extend and retract the 2nd boom extensions with the
JIB pointing almost vertically upwards and downwards.
b.
Slowly extend and retract the JIB extensions to their end position at least twice.
8.
Slowly operate each hydraulically operated add-on equipment such as hoist, grapple, pallet
fork, etc. to their end position at least two times.
CAUTION
Do not keep the lever engaged at the end position of each movement.
9.
Check the oil level in the tank and top up if necessary.
Maintenance and Service
HIAB 410K PRO
73