Pulsafeeder Pulsalube 8 GS Ultra, Operation & Maintenance Manual

Page: 164 / 198

DRIVESYSTEMS
MINICASE
®
(SM SERIES) WORM GEAR
LUBRICATION GUIDELINES
RETAIN FOR FUTURE USE U10790 - 1 of 2
1. Importance of proper gearbox lubrication
Proper gearbox lubrication is essential in order to reduce
friction, heat, and component wear. Lubricants reduce heat
and wear by inserting a protective “fl uid boundary” between
mating parts and preventing direct metal to metal contact.
Lubricants also help prevent corrosion and oxidation,
minimize foam, improve heat transfer, optimize reducer
effi ciency, absorb shock loads and reduce noise.
2. Maintenance free design
MINICASE ® (SM series) worm gear reducers are designed to be
maintenance-free and are supplied completely sealed. They
are factory oil-fi lled with a pre-determined oil fi Il amount
in accordance to the specifi ed reducer size and mounting
position. The synthetic lubrication used is suitable for the life
of the product so the MINICASE™ is inherently maintenance
free.
3. Standard oil type
The standard factory oil fi ll for MINICASE ® (SM) worm gear
reducers is ISO viscosity VG synthetic hydrocarbon/polyal-
phaolefi n (SHC/PAO oil) food grade oil suitable for NSF-H1
incidental contact and is a factory stocked lubricant. Food
grade oil suitable for NSF-H1 incidental contact is a factory
stocked option.
See user manual U11040 for specifi c information and for op-
tional MINICASE
® (SM) worm lubrication types and options.
STOP
HARMFUL SITUATION
STOP
In worm gears avoid using extreme pressure (EP) gear oils
containing sulfur-phosphorous chemistries; these additives
can react adversely with bronze worm gears, and acceler-
ate wear.
4. Effi ciency
It is important to consider the following, when using worm
gears.
• Worm gears reach their peak rated effi ciency, after they
undergo a natural run-in process (up to 25 hours operating
time at maximum rated load). Catalog published power
and torque fi gures are based upon the rated effi ciency
after the run-in is complete.
• Worm gears have naturally lower startup effi ciencies com-
pared to operating effi ciencies. As input speed increases
the enhanced hydrodynamic effects of the oil result in less
tooth friction and increased worm gear effi ciency.
IMPORTANT NOTE
Worm gear reducers applied in cold temperature service , may
require increased motor power for the following reasons:
• Lower operating temperatures, cause lubrication viscosity
to increase in both the gearbox and in the moving areas
of the driven machine.
•
Worm-gears have naturally lower start-up effi ciencies
compared to operating effi ciencies.
• In extreme cases, one might need to consider increasing
the motor power and/or lowering the oil viscosity.
5. Maximum oil sump temperature limit
To prevent reducer overheating, the reducer’s maximum oil
sump temperature limit must not be exceeded for prolonged
periods of operation (up to 3 hours continuous operation de-
pending upon reducer size).
Oil Type Maximum Oil Temperature Limit
NORD
AGMA 9005-D94
Synthetic 105°C (220°F) 107°C (225°F)
IMPORTANT NOTE
Use caution when specifying gear reducers for high tem-
perature service.
If there is concern about exceeding the
allowable safe operating temperatures, please consult
NORD to discuss alternatives.
www.nord.com/docs 04.24.13
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378