FLENDER ZAPEX - Page 51

Maintenance
8.4 Dismantling the coupling
M3560-02en Edition 09/2022 51
NOTICE
Risk of injury and danger to the environment from escaping oil.
• Catch any oil which escapes.
• Dispose of the oil according to the valid regulations.
Tools required
• One oil pump with pressure gauge (at least 2500bar) per oil channel.
Or: One motor-driven oil pump. One connection that can be closed independently is re-
quired for each oil channel.
Refer to the dimension drawing for the number of oil channels.
• With a stepped bore:
A motor-driven oil pump at the oil channel located at the point of transition from the
smaller to the larger bore. A large quantity of oil per unit of time is needed here.
• Suitable connections and pipes.
• Suitable pulling fixture.
Or: Retaining plate with retaining screws or threaded spindles with nuts. Material of the
screws and spindles must have at least strength class 10.9; material of the nuts depend-
ing on the material of the screws or spindles.
• Hydraulic cylinder with oil pump. Note displacement and pressure of the hydraulic cylin-
der. Refer to the dimension drawing for the required axial force.
Procedure
1. Use a suitable pulling fixture.
2. Secure the coupling part1(1) or 2(2) and the pulling fixture in position to prevent them
from falling.
3. Remove the screw plugs(22) from the oil ducts.
4. Deaerate an oil pump and connect it to the oil channel in the centre.
5. Pressurise the oil pump to the pressure specified in the dimension drawing until oil starts
to escape from the adjacent connections or the front faces. Keep the pressure constant.
6. Deaerate the next oil pump and connect it to the adjacent oil channel.
7. Repeat steps 5 and 6 for the remaining oil ducts.
8. If so much oil escapes when pressure is applied that the pump cannot maintain the pres-
sure, use a higher-viscosity oil.
9. Pressurise the hydraulic cylinder if oil escapes from both front faces as a closed oil ring.
Make sure that the coupling part 1 (1) or 2 (2) is pulled immediately off the shaft in a
swift, smooth movement.
NOTICE
Removal in several strokes
If several strokes of the hydraulic cylinder are required to remove the part, make sure that
the shaft end is positioned between two oil channels at the end of the stroke.
10.Dismantle the oil pumps and the pulling fixture from the coupling part1(1) or 2(2).