6 MG 71 en
5
10. Put the plastic caps back on the setscrews.
11. Adjustment completed.
3
OPERATING INSTRUCTIONS
The series M gears are manually operated quarterturn gear-
boxes made of cast iron.
The maximum allowable input- and output torques are
mentioned in Chapter 1.2.
1. The gearbox is manually operated by handwheel.
2. For opening the valve, the handwheel is turned coun-
terclockwise. Closing is clockwise.
3. Stop turning when the required valveposition is achie-
ved. The number of turns needed from totally open to
totally close the valve is in Table 3.
4. The valveposition is indicated by the position indicator
on top of the gearbox.
5. When the valve can not be totally opened (or closed),
first detect and solve the cause of malfunction.
6. In case of malfunction of the gearbox, this one has to be
replaced (see chapter installation for dismounting).
Return the gearbox to your supplier for repair.
7. When you do the repair in house, all replacement parts
must be obtained from the manufacturer to assure pro-
per operation of the gearbox.
8. The gearbox is self-braking. Therefore no fixation needs
to be installed to retain the valve position.
9. When the fault is repaired, turn the handwheel until blo-
cked.
10. The system is ready for use.
4
MAINTENANCE
Under normal conditions, the gearbox is maintenance free.
The series M gearboxes can be used at ambient tempera-
tures from –20 to +120 °C.
The standard gearbox reaches IP67 (dust- and waterspray
proof ). Cleaning can be done with a waterhose, not a high
pressure waterjet.
Fig. 3
Gearbox setscrew adjustment
Table 3
No. of turns for totally open/closed
Manual gear
Turns
M07
9,25
M10
9,25
M12
8,5
M14
9,5
M15
13,75
M16
27
M25
19,5
Fig. 4
Gearbox, series M