widos 4400 - Checking the Hydraulic Oil-Level; Venting the Hydraulic Cylinders

Kunststoffschweißtechnik
Maintenance and Repair Chapter 7
23.06.15 Working Instructions WIDOS 4400 Page 29 of 44
7.6. Checking the hydraulic oil-level
x Unscrew the red cover screw on the top of the aggregate.Remove the integrated oil
dipstick, clean it with a dry tissue and insert it again in the tank by screwing. Remove the oil
disptick again and check the oil level.
x The oil level must be between the two marks. If the oil level is under the lower mark, then
hydraulic oil of the quality HLDP 32 must be added.
7.7. Venting the hydraulic cylinders
x Venting the hydraulic cylinder is not
required if
x the hoses have been disconnected from the quick-action couplings at the control unit
because the remaining oil in the hose is being kept by valves and for this reason no air
can enter.
x The hydraulic cylinder must be vented if
x there has been too less oil in the tank and air has been attracted.
x there were leaky parts at the hoses or in the connections.
x the hoses were unscrewed from the basic machine.
x Eliminate the cause of the air entrance.
x Open the machine completely.
x First unscrew the lower „vent screw (Z1) for closing“ (lefthand side).
x Connect the transparent venting hose and insert it in the collecting vessel of the aggregate.
x Close until there is no more air visible in the venting hose, then tighten again the vent
screw.
x Close the machine completely.
x Unscrew the lower „vent screw (A1) for opening“ (righthand side).
x Connect the transparent venting hose and insert it in the collecting vessel of the aggregate.
x Open until there is no more air visible in the venting hose, then tighten again the vent screw.
x When the venting process at the lower vent screws is completed, repeat the process at the
upper „vent screw (Z2) for closing“ (lefthand side), as well as at the upper „vent screw (A2)
for opening“ (righthand side).
The lower vent screws always have to be vented at first because there is a
direct connection between the upper and the lower cylinders.
x If air remains in the lower cylinder, it will ascend in the upper cylinder when
pressure is applied.
A2
Z2
Z1
A1