Instructions for use and maintenance
Electric gearmotors 24-400 V AC
Page
12
of
16
9.2
Inspection and maintenance work
Visual check
Check that the gearbox does not leak. Also check that the gearbox has no external damage and
there are no cracks on hoses, hose fittings and anti-vibration rubber pads. If any leakage occurs,
such as oil or cooling water drips, damage or cracks, immediately repair the gearbox.
Shaft sealing rings are components that have a limited life and are subject to wear and aging.
The service life of shaft rings depends on the most varied environment conditions. Temperature,
light (especially UV light), ozone and other gases and fluids affect the ageing process of shaft
rings. Some of these influences can alter the physic-chemical characteristics of shaft sealing
rings and, depending on their intensity, considerably shorten their duration. Foreign matter (e.g.
dust, mud, sand, metal particles) and overheating (excessive rotation rate or heat adduced from
other sources) accelerate sealing lip wear. In the factory these elastomeric lips are lubricated
with a special grease. This lubrication minimizes their inherent wear and tear and ensures a long
service life. For this reason the presence of a veil of oil at the sealing lip is normal and should
not be interpreted as a loss.
Noise control
If there are unusual noises and/or vibrations during the operation of the gearbox, this may
indicate a failure of the gearbox itself. In this case it is necessary to stop the gearbox and perform
a general overhaul.
Oil change
Procedure:
1.
Place a collection vessel under the oil tap or drain cap.
2.
Completely unscrew the oil level cap or, if the oil level tank is used, the cap with level rod
and the drain cap.
3.
Fully drain the oil from the gearbox.
4.
If the oil drain cap or oil cap seal ring is damaged, use a new oil cap or clean the thread and,
before screwing, apply a thread brake, such as Loctite 242, Loxeal 54-03.
5.
Screw the oil drain cap and tighten to the required tightening torque.
6.
Pour the new oil of the same type through the oil level hole with a suitable filling device,
until the oil starts to escape from the hole. (The oil can also be introduced through the vent
hole or a threaded plug located above the oil level). If a tank is used, introduce the oil from
the upper loading hole (thread G1¼) until the oil reaches the level described in Chapter 9.2
"Inspection and maintenance work".
7.
Wait at least 15 minutes. If an oil level tank is used, the oil level shall be checked at least 30
minutes after filling.
Cleaning and possible replacement of the venting screw
Unscrew the vent cap, clean it thoroughly (for example with compressed air) and reassemble it
in the same position. If necessary, use a vent screw with a new sealing ring.
