nord NORDBLOC.1 User manual

BIM 1013
NORDBLOC®.1 Helical Gearboxes
Installation and Maintenance Instructions
Retain These Safety Instructions For Future Use
USA
CDN
INSPECTION OF UNIT
Thoroughly inspect the equipment for any shipping and handling damage before accepting shipment from the freight company. If any of the
goods called for in the bill of lading or express receipt are damaged or the quantity is short, do not accept until the freight or express agent
makes an appropriate notation on your freight bill or express receipt. If any concealed loss or damage is discovered later, notify your freight
carrier or express agent at once and request him to make an inspection. We will be very happy to assist you in collecting claims for loss or
damage during shipment; however, this willingness on our part does not remove the transportation company’s responsibility in reimbursing
you for collection of claims or replacement of material. Claims for loss or damage in shipment must not be deducted from the NORD Gear
invoice, nor should payment of the NORD Gear invoice be withheld awaiting adjustment of such claims, as the carrier guarantees safe
delivery.
If considerable damage has been incurred and the situation is urgent, contact the nearest NORD Gear Sales Office for assistance. Please
keep a written record of all communications.
RECORD NAMEPLATE DATA
Locate the gear reducer nameplate and record all nameplate data for future reference.
SK ________________________________________________________ S/N _________________________________
RATIO ______________ MAX TORQUE ____________________ RPM ______________ MTG. POS ______________
STORAGE
PROPER STORAGE UNTIL INSTALLED
Keep unit in a dry, temperature controlled area. If stored other
than said, long term storage methods must be applied to the unit
including complete fill with lubricant. Protect machined surfaces
and rotate shafts periodically. Prior to putting unit into service,
drain lubricant and refill to proper level as determined by the
mounting position.
PROPER HANDLING OF THE UNIT
Exercise care to prevent damage to the unit when moving. Lift
only at designed Iifting points. Do not attach other machinery and
lift by the unit lifting points. The lifting points are to be used to lift
the unit only. Insure that adequate safety measures are taken to
protect personnel during transportation. Protect the mounting
surface from damage.
BIM 1013/2008/11 Page 1 of 10 www.nord.com

BIM 1013/2008/11 Page 2 of 10 www.nord.com
INSTALLATION OF UNIT
To ensure reliable service and dependable performance, an enclosed gear drive must be rigidly supported and the shafts accurately aligned.
Folioing are some precautions required to accomplish this end.
FOUNDATION
The responsibility for the design and construction of the
foundation is with the user. The foundation must be adequate to
withstand normal operating loads and possible overloads while
maintaining alignment to attached system components under
such Ioads.
MOUNTING POSITION
Unless a unit is specifically ordered for inclined mounting, the
foundation must be Ievel and flat. The Iubrication system may not
operate properIy if the unit is not mounted in the position for which
it is designed. It may be desirable to elevate the foundation to
facilitate oil drainage.
CONCRETE FOUNDATION
If a concrete foundation is used, steel mounting pads and boIts of
sufficient size to distribute the stress into the concrete shouId be
grouted into the foundation.
STEEL FOUNDATION
If a structural steel foundation is used (i.e. wide fIange beams or
channels), a base pIate or soIe pIate of suitable thickness shouId
be used and shouId extend under the entire unit.
FOOT MOUNTED UNITS
Use shims under the feet of the unit to align the output shaft to the
driven equipment. Make sure that all feet are supported so that
the housing will not distort when it is bolted down. Improper
shimming will reduce the life of the unit and may cause failure.
Dowel pins may be installed to prevent misalignment and ensure
proper realignment if removed for service.
FLANGE MOUNTED UNITS
If a structural steel foundation is used (i.e. wide fIange beams or
channels), a base pIate or soIe pIate of suitable thickness shouId
be used and shouId extend under the entire unit. If a bulk head
pIate is used it shouId be of proper strength to minimize buckling
distortions.
FIange PiIot ‘AK’ or ‘AK1’ toIerance
Metric (mm)
>∅50 ≤∅80 = +0.012/-0.007
>∅80 ≤∅120 = +0.013/-0.009
>∅120 ≤∅180 = +0.014/-0.011
>∅180 ≤∅230 = +0.016/-0.013
>∅230 ≤∅315 = +0.000-0.032
>∅315 ≤∅400 = +0.000/-0.036
>∅400 ≤∅500 = +0.000/-0.040
Inch
>∅1.969 ≤∅3.150 = +0.005/-0.0003
>∅3.150 ≤∅4.724 = +0.005/-0.0004
>∅4.724 ≤∅7.087 = +0.006/-0.0004
>∅7.087 ≤∅9.055 = +0.006/-0.0005
>∅9.055 ≤∅12.402 = +0.000/-0.0013
>∅12.402 ≤∅15.748 = +0.000/-0.0014
>∅15.748 ≤∅19.685 = +0.000/-0.0016
BOLT STRENGTH
BoIt size, strength and quantity shouId be verified to insure proper
torque reaction capacity whatever the mounting arrangement.
PRIME MOVER MOUNTING
Align the prime mover to the reducer-input shaft using shims
under the feet. Make sure that the feet are supported. Dowel pin
the prime mover to its foundation.
SHAFT CONNECTIONS
When connecting shafts to either the input or output of the
reducer, consider the foIIowing:
Coupling hubs should be installed in accordance with
ANSI/AGMA 9002-A86
Consult with the manufacture to determine proper assembly
and fit, prior to installing outboard sprockets or gears.
Interference fits may require heating the sprocket or gear per
the manufacturer’s recommendations, generaIIy up to 250°F
to 300°F, (120°C to 150°C), before assembling to the shaft.
NORD SHAFT TOLERANCES
Solid shaft diameter tolerance
Metric (mm)
≤∅18 = +0.012/+0.001
>∅18 ≤∅30 = +0.015/+0.002
>∅30 ≤∅50 = +0.018/+0.002
>∅50 ≤∅80 = +0.030/+0.011
>∅80 ≤∅120 = +0.035/+0.013
>∅120 ≤∅180 = +0.040/+0.015
Inch
≤∅1.750 = +0.0000/-0.0005
>∅1.750 = +0.0000/-0.0010
Solid shaft driII and tap at shaft end
Metric (mm)
≤∅16 = M5
>∅16 ≤∅21 = M6
>∅21 ≤∅24 = M8
>∅24 ≤∅30 = M10
>∅30 ≤∅38 = M12
>∅38 ≤∅50 = M16
>∅50 ≤∅85 = M20
>∅85 ≤∅130 = M24
Inch
≤∅0.500 = 10-24 x 0.43 deep
>∅0.500 ≤∅0.875 = 1/4-20 x 0.59 deep
>∅0.875 ≤∅0.938 = 5/16-18 x 0.71 deep
>∅0.938 ≤∅1.100 = 3/8-16 x 0.87 deep
>∅1.100 ≤∅1.300 = 1/2-13 x 1.10 deep
>∅1.300 ≤∅1.875 = 5/8-11 x 1.4 deep
>∅1.875 ≤∅3.500 = 3/4-10 x 1.7 deep
>∅3.500 = 1-8 x 2.2 deep

BIM 1013/2008/11 Page 3 of 10 www.nord.com
WARNING:
LOCK OUT POWER before any maintenance is performed.
Make absolutely sure that no voltage is applied while work is
LOCATION
Coupling hubs shouId be mounted flush with the shaft ends,
unless specificaIIy ordered for overhung mounting. Pinions,
sprockets and sheaves shouId be mounted as close as possible
to the unit housing to minimize bearing Ioads and shaft
deflections.
COUPLING ALIGNMENT
Shaft couplings should be instaIIed according to the coupling
manufacturer’s recommendations for gap, angular and paraIIeI
aIignment. In many instaIIations, it is necessary to aIIow for
thermaI and mechanicaI shaft movement when determining shaft
aIignment. The coupIing manufacturer’s recommendations
shouId be foIIowed.
AXIAL DISPLACEMENT
The gap between shaft ends shouId be the same as the specified
coupIing gap unless overhung mounting of the coupIing hub is
specified. The coupIing gap and shaft gap must be sufficient to
accommodate any anticipated thermal or mechanicaI axiaI
movement.
ANGULAR ALIGNMENT
Insert a spacer or shim stock equal to the required coupIing gap
between the coupIing hub faces and measure the clearance using
feeler gauges. Repeat this at the same depth at 90-degree
intervals to determine the amount of angular misalignment.
PARALLEL ALIGNMENT
Mount a dial indicator to one coupIing hub, and rotate this hub,
sweeping the outside diameter of the other hub. The paraIIeI
misalignment is equal to one-half of the total indicator reading.
Another method is to rest a straight edge squarely on the outside
diameter of the hubs at 90-degree intervals and measure any
gaps with feeler gauges. The maximum gap measurement is the
paraIIeI misalignment.
CHECKING ALIGNMENT
After both angular and paraIIeI alignments are within specified
Iimits, tighten aII foundation boIts securely and repeat the above
procedure to check aIignment. If any of the specified Iimits for
aIignment are exceeded, realign the coupIing.
SPROCKET OR SHEAVE ALIGNMENT
AIign the sheaves or sprockets square and paraIIeI by placing a
straight edge across their faces. AIignment of bushed sheaves
and sprockets shouId be checked after bushings have been
tightened. Check horizontal shaft aIignment by placing a IeveI
verticaIIy against the face of the sheave or sprocket. Adjust beIt
or chain tension per the manufacturer’s specified procedure.
OUTBOARD PINION ALIGNMENT
Align the pinion by adjusting the gear tooth clearance according to
the manufacturer’s recommendations and checking for acceptable
outboard pinion tooth contact. The foundation boIts may have to
be Ioosened and the unit moved slightly to obtain this contact.
When the unit is moved to correct tooth contact, the prime mover
shouId be realigned.
RECHECK ALIGNMENT
After a period of operation, recheck aIignment and adjust as
required.
1. Properly install unit on a rigid foundation
•adequately supported
•securely bolted into place
•IeveIed so as not to distort the gear case
2. Properly install couplings suitable for the application and
connected equipment.
3. Ensure accurate aIignment with other equipment.
4. Furnish and install adequate machinery guards as needed to
protect operating personnel and as required by the
applicable standards of the Occupational Safety and Health
Administration (OSHA), and by other applicable safety
regulations;
5. Ensure that driving equipment is running in the correct
direction before coupling to reducers with backstops
(designed to operate onIy in a specific direction) or
machinery designed to operate only in one direction.
CHANGES IN PERFORMANCE SPECIFICATIONS
The owner has the responsibility to consult with NORD GEAR if
such items such as applied Ioads, operating speeds or other
operating conditions have changed.
START-UP
1. Ensure that switches, alarms, heaters, coolers and other
safety and protection devices are instaIIed and operational
for their intended purpose.
2. Verify that the installed mounting position is the same as the
nametag mounting position. If not, relocate the vent plug, fill
plug and drain plug according to the tables on pages 5-7 and
make the necessary adjustments to the oil level.
OPERATION AND MAINTENANCE CHECKLIST
1. Operate the equipment as it was intended to be operated
2. Do not overload.
3. Run at correct speed.
4. Maintain Iubricant in good condition and at proper IeveI.
5. Dispose of used Iubricant in accordance with applicable Iaws
and regulations.
6. Apply proper maintenance to attached equipment at
prescribed intervals recommended by the manufacturer.
7. Perform periodic maintenance of the gear drive as
recommended by NORD.

LUBRICATION
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.
Proper gearbox lubrication is essential in order to reduce friction,
heat, and component wear. Lubricants reduce heat and wear by
inserting a protective “fluid 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 efficiency, absorb shock loads and
reduce noise.
NORD suggests replacing the gear oil if oil analysis indicates
any of the following:
• Viscosity has changed by approximately 10% or more.
All reducers are shipped from the factory with a pre-
determined oil fiIl level in accordance to the specified reducer
size and mounting position (See pages 5-7).
Actual oil volume can vary slightly depending upon the gear
case size, mounting and ratio. Prior to commissioning the
reducer, check the oil-fill level using the reducer’s oil-level
plug and drain or add additional oil as needed.
• 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).
• Acid number tests indicate a significant level of oxidative
break-down of the oil and a critical reduction in
Performance.
OIL PLUG OPTIONS
Standard Oil Type
All gear units are assembled with the oil fill-level, oil-drain and
vent plugs installed in their proper locations, according to the
specified mounting position that is shown on the reducer nametag
(See Pages 5-7). All standard plugs are metric and utilize sealing
gaskets between the head of the plug and the reducer housing.
The standard NORDBLOC.1 gear units are supplied with mineral-
base oil, ISO viscosity grade VG220.
Gear units may also be supplied with specific lubricants designed
to operate in certain environments, extend service life, or extend
the service temperature range. Consult the lubrication decal
adjacent to the fill plug to determine the type of lubricant installed
at the factory.
Drain Plug
All reducer drain plugs are metric socket
head cap screws. For ease of draining the
spent oil from the gear reducer use the
socket head screw located at the lowest
part of the gearbox.
Fill Level Plug
For ease of identification, it is NORD’s
standard practice to provide a hex-head
screw for the fill-level plug
Oil Viscosity
Viscosity or the oil’s resistance to shear under load is often
considered the single most important property of any gear oil.
There are three primary reasons to consider a lubrication viscosity
change as follows:
1. Low temperature gear oils should be selected so that the
pour point is at least 9°F (5°C) lower than the expected
minimum ambient temperature. In extreme cases, consider
a lower ISO Viscosity rating and test the critical performance
of the gear box under cold start-up.
Vent Plug Options
Proper 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 on all NORDBLOC.1 gear units.
2. High temperature applications may require an increase in
the lubricants viscosity to assure proper lubrication
conditions in the critical load zones of the gear unit. NORD
also recommends switching to synthetic oil if oil sump
temperatures exceed 176-185 °F (80-85 °C).
Autovent™
The AUTOVENT™ helps prevent bearing
and gear damage by blocking entry of
foreign material (water, dust, corrosives,
etc.) through a breather that acts like a
check valve. The typical design utilizes a
spring pressing a ball or a sealing plunger,
which presses against a machined orifice.
The check valve opens at approximately 2
psi during operation and closes tightly when
the gearbox cools, producing a slightly
negative pressure to ensure a tight seal.
This keeps contaminants out of the oil,
helps maintain proper oil cleanliness,
reduces contamination, oil foaming and
oxidation. The AUTOVENT™ is perfect for
humid conditions, washdown applications,
and dusty environments.
3. In cases of extreme load conditions, gear pairs and
antifriction bearings may be more susceptible to scuffing
wear. In these operating conditions, it may be beneficial to
consider an increased lubrication viscosity and/or lubrication
with improved antiwear additive packages.
NORD recommends that the user consult with their primary
lubrication supplier when considering changes in oil viscosity.
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 depending upon
reducer size).
Open Vent
Maximum Oil Temperature Limit
Oil Type NORD AGMA 9005-D94
Mineral 80-85 °C (176-185 °F) 95 °C (203 °F)
Synthetic 105 °C (220 ° F) 107 ° C (225 ° F)
An optional open vent can be supplied on NORD reducers. The
open vent will be closed upon delivery to prevent oil leakage.
Before the reducer is put in service the open vent should be
activated by removing the sealing plug.
The Importance of Routine Oil Analysis Filtered Vent
NORD may offer an optional filtered vent, which allows gases to
permeate, but does not allow dust and debris to pass through the
vent.
Routine oil analysis, sound lubrication practices, and good
tracking of oil performance trends as related to specific
equipment, will help establish proper lubrication maintenance and
change-out intervals. To maximize equipment reliability, NORD
Gear generally recommends a condition-based lubrication
maintenance program.
BIM 1013/2008/11 Page 4 of 10 www.nord.com

MOUNTING POSITIONS
The mounting position charts that follow detail the standard mounting positions for horizontal and vertical mounting. The gearbox nametag will
indicate the mounting position that was provided. For mounting orientations other than shown consult NORD Gear.
FOOT-MOUNTED
FLANGE-MOUNTED
M6 M2
M3
M5
M4
M1
BIM 1013/2008/11 Page 5 of 10 www.nord.com

OIL PLUG LOCATIONS
All gear units are assembled with the oil fill-level, oil-drain and vent plugs installed in their proper locations, according to the specified
mounting position that is shown on the reducer nametag. All standard plugs are metric and utilize sealing gaskets between the head of the
plug and the reducer housing.
SK 072.1
SK 172.1
SK 072.1 F
SK 172.1 F
SK 372.1
SK 572.1
SK 672.1
SK 373.1
SK 573.1
SK 673.1
SK 372.1 F
SK 572.1 F
SK 672.1 F
SK 373.1 F
SK 573.1 F
SK 673.1 F
M1
M2
M3
M4 M5
M6
M1
M2
M3
M4 M5
M6
M1
M2
M3
M4 M5
M6
M1
M2
M3
M4 M5
M6
BIM 1013/2008/11 Page 6 of 10 www.nord.com

LUBRICANT CAPACITY
All reducers are shipped from the factory with a pre-determined oil fiIl level in accordance to the specified reducer size and mounting position.
Actual oil volume can vary slightly depending upon the gear case size, mounting and ratio. Prior to commissioning the reducer, check the oil-
fill level using the reducer’s oil-level plug and drain or add additional oil as needed.
Foot-mounted
Mounting
Po si t i o n M1 M2 M3 M4 M5 M6
Quarts Liters Quarts Liters Quarts Liters Quarts Liters Quarts Liters Quarts Liters
SK 0 72 . 1 0.17 0.16 0.34 0.32 0.22 0.21 0.24 0.23 0.19 0.18 0.21 0.20
SK 1 72 . 1 0.29 0.27 0.62 0.59 0.44 0.42 0.48 0.45 0.34 0.32 0.41 0.39
SK 3 72 . 1 0.43 0.41 0.96 0.91 0.82 0.78 1.16 1.10 0.58 0.55 0.68 0.64
SK 3 73 . 1 0.43 0.41 0.90 0.85 0.79 0.75 1.10 1.04 0.58 0.55 0.63 0.60
SK 572.1 0.95 0.90 2.11 2.00 1.80 1.70 2.54 2.40 1.27 1.20 1.48 1.40
SK 573.1 0.95 0.90 2.01 1.90 1.74 1.65 2.43 2.30 1.27 1.20 1.43 1.35
SK 672.1 1.37 1.30 3.07 2.90 2.59 2.45 3.70 3.50 1.85 1.75 2.11 2.00
SK 6 73 . 1 1.37 1.30 2.96 2.80 2.54 2.40 3.59 3.40 1.85 1.75 2.06 1.95
Flange-Mounted
Mounting
Po si t i o n M1 M2 M3 M4 M5 M6
Quarts Liters Quarts Liters Quarts Liters Quarts Liters Quarts Liters Quarts Liters
SK 0 7 2 . 1 0.17 0.16 0.34 0.32 0.22 0.21 0.24 0.23 0.19 0.18 0.21 0.20
SK 1 72 . 1 0.29 0.27 0.62 0.59 0.44 0.42 0.48 0.45 0.34 0.32 0.41 0.39
SK 3 7 2 . 1 0.43 0.41 0.96 0.91 0.82 0.78 1.16 1.10 0.58 0.55 0.68 0.64
SK 3 7 3 . 1 0.43 0.41 0.90 0.85 0.79 0.75 1.10 1.04 0.58 0.55 0.63 0.60
SK 572.1 0.95 0.90 2.11 2.00 1.80 1.70 2.54 2.40 1.27 1.20 1.48 1.40
SK 573.1 0.95 0.90 2.01 1.90 1.74 1.65 2.43 2.30 1.27 1.20 1.43 1.35
SK672.1 1.371.303.072.902.592.453.703.501.851.752.112.00
SK 6 7 3 . 1 1.37 1.30 2.96 2.80 2.54 2.40 3.59 3.40 1.85 1.75 2.06 1.95
BIM 1013/2008/11 Page 7 of 10 www.nord.com

MAINTENANCE
LUBRICATION REPLACEMENT
If the gear unit is filled with mineral oil, the lubricant should be replaced at least after every 10,000 operating hours or after every two years. If
the gear unit is filled with synthetic oil, the lubricant should be replaced at least after every 20,000 operating hours or after every four years
Often gear reducers are exposed to extreme ambient conditions, hostile environments, wet conditions, or dirty and dusty operating areas.
Especially in these situations, it is important to establish a condition-based oil service interval.
OIL SPECIFICATIONS
NORD supplies aII reducers’ fiIIed with oiI from the factory. Standard lubricant is ISO VG220 mineral-based oil. Consult the sticker adjacent
to the fill plug to determine the type of lubricant installed at the factory. However, some units have special lubricants designed to operate in
certain environments or to extend the service life or service temperature range of the lubricant. If in doubt about which lubricant is needed,
contact NORD Gear.
Standard Oil Lubricant
Gear Unit Type Ambient Temperature Oil Type ISO Viscosity Manufacturer Brand / Type
NORDBLOC®.1 -4 to 104 °F (-20 to 40 °C) MIN-EP VG 220 Shell / Omala 220 6
Optional Oil Lubricants
Gear Unit Type Ambient Temperature Oil Type ISO Viscosity Manufacturer Brand / Type
-31 to 176 °F (-35 to 80 °C) PAO VG 460 Mobil / SHC 634
-40 to 140 °F (-40 to 60 °C) PAO VG 220 Mobil / SHC 630 6
-22 to 77 °F (-30 to 25 °C) PAO VG 150 Mobil / SHC 629
23 to 104 °F (-5 to 40 °C) FG VG 220 Shell / FM 220 6
NORDBLOC®.1
-40 to 140 °F (-40 to 60 °C) FG-PAO VG 220 Shell / Cassida GL 220
Bearing Grease Lubricants
Grease Type (Thickener) Ambient Temperature NLGI Grade Manufacturer Brand / Type
Standard (Li-Complex ) -22 to 140 °F (-30 to 60 °C) NLGI 2 Shell Albida EP 2 6
High-Temperature (Polyurea) -13 to 176 °F (-25 to 80 °C) NLGI 2 Mobil Polyrex EP 2 6
Food-Grade (Al-Complex) -13 to 104 °F (-25 to 40 °C) NLGI 2 Mobil Grease FM 222 6
6Stocked Lubricants
OIL CROSS-REFERENCE CHART
ISO
Viscosity Oil Type
Service
Temperature
Range Shell Castrol
MIN-EP 68 to 122°F
(20 to 50°C)
Mobilgear
634
Omala
460 7EP Klüberoil
GEM 1-460
Energol
GR-XP 460
Tribol
1100/460
VG 460
PAO -22 to 176°F
(-30 to 80°C)
Mobil
SHC 634
Omala
460 HD
Isolube
EP 460
Klübersynth
EG 4-460 N/A Tribol
1510/460
MIN-EP 20 to 104°F
(-5 to 40°C)
Mobilgear
630
Omala
220 5EP Klüberoil
GEM 1-220
Energol
GR-XP 220
Tribol
1100/220
VG 220
PAO -30 to 176°F
(-34 to +80°C)
Mobil
SHC 630
Omala
220 HD
Isolube
EP 220
Klübersynth
EG 4-220 N/A Tribol
1510/220
MIN-EP 5 to 77°F
(-15 to 25°C)
Mobilgear
629
Omala
150 4EP Klüberoil
GEM 1-150
Energol
GR-XP 100
Tribol
1100/100
VG 150
PAO
-35 to 50°F
(-37 to 10°C)
Mobil
SHC 629
Omala
150 HD
Isolube
EP 150
Klübersynth
EG 4-150 N/A N/A
Oil Formulation Codes Important Notes
MIN-EP Mineral Oil with EP Additive
PAO Synthetic Polyalphaolefin Oil
PG Synthetic Polyglycol Oil
FG Food-Grade Oil
FG-PAO Food-Grade, Synthetic Poyalphaolefin Oil
Food grade lubricants must be in compliance with FDA 212 CFR 178.3570
and qualify as a NSF-H1 lubricant. Please consult with lubrication
manufacture for more information.
When making a lubrication change, check with the lubrication supplier to
assure compatibility and to obtain recommended cleaning or flushing
procedures.
Do not to mix different oils with different additive packages or different base
oil formulation types. Polyglycol (PG) oils are not miscible with other oil
types and should never be mixed with mineral oil.
Please Consult NORD if considering oils of ISO Viscosity VG100 or lower.
BIM 1013/2008/11 Page 8 of 10 www.nord.com

BIM 1013/2008/11 Page 9 of 10 www.nord.com
TROUBLE SHOOTING
PROBLEM WITH THE REDUCER POSSIBLE CAUSES SUGGESTED REMEDY
Overloading Load exceeds the capacity of the
reducer
Check rated capacity of reducer, replace
with unit of sufficient capacity or reduce
load
Insufficient lubrication Check lubricant level and adjust up to
recommended levels
Excessive lubrication Check lubricant level and adjust down to
recommended levels
Runs Hot
Improper lubrication
Wrong lubrication Flush out and refill with correct lubricant as
recommended
Weak mounting structure
Inspect mounting of reducer. Tighten loose
bolts and/ or reinforce mounting and
structure
Loose foundation bolts
Loose hold down bolts Tighten bolts
May be due to lack of lubricant Replace bearing. Clean and flush reducer
and fill with recommended lubricant.
Failure of Bearings
Overload Check rated capacity of reducer.
Runs Noisy
Insufficient Lubricant Level of lubricant in the reducer not
properly maintained.
Check lubricant level and adjust to factory
recommended level.
Overloading of reducer can cause
damage.
Replace broken parts. Check rated capacity
of reducer.
Internal parts are broken Key missing or sheared off on input
shaft. Replace key.
Output Shaft
Does Not Turn
Improper coupling connection Coupling loose or disconnected. Properly align reducer and coupling.
Tighten coupling.
Worn Seals Caused by dirt or grit entering seal. Replace seals. Autovent may be clogged.
Replace or clean.
Overfilled reducer. Check lubricant level and adjust to
recommended level.
Autovent™ clogged. Clean or replace, being sure to prevent any
dirt from falling into the reducer.
Oil Leakage
Improper mounting position, such as
wall or ceiling mount of horizontal
reducer.
Check mounting position. Name tag & verify
with mounting chart in manual.

BIM 1013/2008/11 Page 10 of 10 www.nord.com
NORD Gear Corp
WEST
Corona, CA (Los Angeles)
Phone [phone]
MIDWEST
Waunakee, WI (Madison)
Phone [phone]
Toll Free 888-314-6673 info.[email protected]
ATLANTIC
Charlotte, NC
Phone [phone]
CANADA
Brampton, ON
Phone [phone]
NORD Gear Ltd
888-668-4378 [e-mail]
www.nord.com