8.4 Manual operation
SKF Maxilube pumping centre can be operated by a manual procedure in the event of an electrical malfunc-
tion or when commissioning before electrification. Pressurise the system by using the manual control screws
of the pumping centre's solenoid valve group.
If the system is designed with shut-off valves, open the shut-off valve of the channel to be pressurised before
the pressurisation of the piping so that the lubricant can be distributed to the lubrication points after the shut-
off valve. See SKF DuoFlex / CLV-2 shut-off valve.
WARNING
Ensure that the pumping centre / control centre is turned off during manual operation. Power must be
turned off before work involving handling of conductive parts or opening any part of the system or product.
One lubrication cycle is performed in manual operation in the following way (see Figure 9):
1. Turn the manual control screw of solenoid valve MV1 90° clockwise so that the directional valve di-
rects pressurisation to line 1.
2. Turn the manual control screw of solenoid valve MV3 also 90° clockwise, after which the pump starts.
3. When the pressure reading in line 1 pressure gauge of the pumping centre rises to 200–250 bar
(3,000–3,600 psi), turn the manual control screw of solenoid valve MV3 to its initial position (90° coun-
ter-clockwise) to stop the pump. Then the pump stops.
4. Let the pressure act in line 1 for about 2 minutes. Maintain the pressure so that all the dosers have
sufficient time to operate.
5. Turn the manual control screw of solenoid valve MV1 to its initial position (90° counter-clockwise).
Then pressure in line 1 discharges.
6. Line 2 can be pressurised after pressure reading has fallen under 50 bar (700 psi) in the pressure
gauge of the line 1 pressure control unit.
7. Turn the manual control screw of solenoid valve MV2 90° clockwise so that the directional valve di-
rects pressurisation to line 2.
8. Turn the manual control screw of solenoid valve MV3 also 90° clockwise, after which the pump starts.
9. When the pressure reading in line 2 pressure gauge of the pumping centre rises to 200-250 bar
(3,000–3,600 psi), turn the manual control screw of solenoid valve MV3 to its initial position (90° coun-
ter-clockwise) to stop the pump. Then the pump stops.
10. Let the pressure act in line 2 for about 2 minutes. Maintain the pressure so that all the dosers have
sufficient time to operate.
11. Turn the manual control screw of solenoid valve MV2 to its initial position (90° counter-clockwise).
Then pressure in line 2 discharges.
12. Line 1 can be pressurised again after pressure reading has fallen under 50 bar (700 psi) in the pres-
sure gauge of line 2 pressure control unit
13. Repeat the steps 1–5.
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