Viking Pump NORD TSM For NORDBLOC.1 Reducers - Manual (Page 13)

DRIVESYSTEMS
HELICAL & BEVEL REDUCER LUBRICATION
RETAIN FOR FUTURE USE
6. The importance of routine oil analysis
Routine oil analysis, sound lubrication practices, and good
tracking of oil performance trends will help establish prop-
er lubrication maintenance and change-out intervals. To
maximize equipment reliability, NORD Gear generally recom-
mends a condition-based lubrication maintenance program.
One may take exceptions to this general recommendation
on sealed-for-life or maintenance-free gear units or smaller
and less costly gear units. In these instances, the replacement
cost of the gear unit is often small compared to the costs
associated with this type of oil analysis program.
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NORD suggests replacing the gear oil if oil analysis indicates
any of the following:
• Viscosity has changed by approximately 10% or more.
• Debris particles (silicon, dust, dirt or sand) exceed 25 ppm.
• Iron content exceeds 150-200 ppm.
• Water content is greater than 0.05% (500 ppm).
• The total acid number (TAN) tests indicate a signifi cant
level of oxidative break-down of the oil, and a critical
reduction in performance; If the TAN number measured
changes by more than 5% over the new oil, then an
oil change would be recommended.
7. Mounting position and oil fi ll quantity
All NORD Gear reducers are shipped from the factory with
a pre-determined oil fi Il level in accordance to the specifi ed
reducer size and mounting position. For additional
information, please see the seperate mounting position
diagrams and the corresponding oil fi ll quantity tables for
the specifi ed gear unit.
The gearbox nametag will indicate the mounting position
that was provided. For mounting orientations other than
shown in the mounting position charts, please consult NORD
Gear.
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Actual oil volume can vary slightly depending upon the
gear case size, mounting and ratio. Prior to commissioning
the reducer, check the oil-fi ll level using the reducer’s oil-
level plug and drain or add additional oil as needed. The
minimum acceptable oil level is 0.15 in (4mm) below the oil
level hole.
8. Oil plug locations
All gear units are assembled with the oil fi ll-level, oil-drain
and vent plugs installed in their proper locations, according
to the specifi ed mounting position. All standard plugs are
metric and utilize sealing gaskets between the head of the
plug and the reducer housing.
9. Drain and fi ll-level plugs
All reducer drain plugs are metric socket head cap screws. For
easier identifi cation, it is NORD’s standard practice to provide
a hex-head screw for the fi ll-level plug. For ease of draining
the used oil from the gear reducer, use the socket head screw
located at the lowest part of the gearbox.
Drain Plug Fill Level Plug
10. Vent plug locations
Reducer venting allows for air pressure differences that occur
during operation, between the inner space of the reducer
and the atmosphere, while ensuring leak-free operation. The
AUTOVENT™ is standard for all vented gear units, unless oth-
erwise noted.
AUTOVENT™ - The AUTOVENT™ helps prevent bearing and
gear damage by behaving like a check valve to block the
entry of foreign material (water, dust, corrosives, etc.). The
breather opens at approximately 2-3 psi during operation
and closes tightly as the gearbox cools. This option is perfect
for humid conditions and wash-down environments, help-
ing to maintain proper oil cleanliness, and reducing foaming
and oxidation. NORD may choose to offer one of two style
options as shown in Figure 1. The Type 2 AUTOVENT™ comes
closed upon delivery with a transportation sealing plug (see
Warning).
Figure 1 AUTOVENT™ Types
Type 1 Type 2 with transportation plug
Open Vent - An optional open vent can be supplied by NORD.
The open vent comes closed upon delivery with a transporta-
tion sealing plug (see Warning).
WARNING
To prevent build-up of excessive pressure, sealed vents
must be activated as shown prior to gear unit start up.
Sealed vent Activated vent
Filtered Vent - NORD may offer an optional fi ltered vent,
which allows gases to permeate, but does not allow dust and
debris to pass through the vent.
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NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378