nord UNICASE Series User manual

BIM 1030/2005/03 1 www.nord.com
BIM 1030
UNICASE®Helical Worm Gearboxes
Installation and Maintenance Instructions
Retain These Safety Instructions For Future Use
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
onIy 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 personneI during transportation. Protect the mounting
surface from damage.
CDN
USA

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INSTALLATION OF UNIT
To ensure Iong service and dependabIe performance, an encIosed gear drive must be rigidIy supported and the shafts accurateIy aIigned.
The foIIowing describes the minimum precautions required to accompIish this end.
FOUNDATION
The responsibiIity for the design and construction of the
foundation Iies with the user. The foundation must be adequate
to withstand normaI operating Ioads and possibIe overIoads whiIe
maintaining aIignment to attached system components under
such Ioads.
MOUNTING POSITION
UnIess a unit is specificaIIy ordered for incIined mounting, the
foundation must be IeveI and fIat. The Iubrication system may
not operate properIy if the unit is not mounted in the position for
which it is designed. It may be desirabIe to eIevate the
foundation to faciIitate oiI drainage.
CONCRETE FOUNDATION
If a concrete foundation is used, steeI mounting pads and boIts of
sufficient size to distribute the stress into the concrete shouId be
grouted into the foundation.
STEEL FOUNDATION
If a structuraI steeI foundation is used (i.e. wide fIange beams or
channeIs), 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 aIign the output shaft to
the driven equipment. Make sure that aII feet are supported so
that the housing wiII not distort when it is boIted down. Improper
shimming wiII reduce the Iife of the unit and may cause faiIure.
DoweI pins may be instaIIed to prevent misaIignment and ensure
proper reaIignment if removed for service.
SHAFT MOUNTED UNITS
Shaft mounted drives should be mounted as close to the driven
equipment bearing support as possible to minimize bearing loads
due to overhung load. Design of the joint connection between the
torque reaction arm and the foundation is the user’s responsibility.
HoIIow Shaft Diameter toIerance
Metric (mm)
≤∅18 = +0.018/-0.000
>∅18 ≤∅30 = +0.021/-0.000
>∅30 ≤∅50 = +0.025/-0.000
>∅50 ≤∅80 = +0.030/-0.000
>∅80 ≤∅120 = +0.035/-0.000
>∅120 ≤∅180 = +0.040/-0.000
Inch
≤∅4.375 = +0.0010 / -0.0000
>∅4.375 = +0.0015 / -0.0000
Customer shaft diameter toIerances with keyed hoIIow shafts
Metric (mm)
≤∅18 = +0.000/-0.011
>∅18 ≤∅30 = +0.000/-0.013
>∅30 ≤∅50 = +0.000/-0.016
>∅50 ≤∅80 = +0.000/-0.019
>∅80 ≤∅120 = +0.000/-0.022
>∅120 ≤∅180 = +0.000/-0.025
Inch
≤∅1.500 = +0.000/-0.002
>∅1.500 ≤∅2.500 = +0.000/-0.003
>∅2.500 ≤∅7.000 = +0.000/-0.004
Shaft finish to be 125 micro inches or smoother.
Customer shaft diameter toIerance with Shrink Disc fit h6
Metric (mm)
≤∅18 = +0.000/-0.011
>∅18 ≤∅30 = +0.000/-0.013
>∅30 ≤∅50 = +0.000/-0.016
>∅50 ≤∅80 = +0.000/-0.019
>∅80 ≤∅120 = +0.000/-0.022
>∅120 ≤∅180 = +0.000/-0.025
Inch
≤∅0.750 = +0.0000/-0.0004
>∅0.750 ≤∅1.125 = +0.0000/-0.0005
>∅1.125 ≤∅2.000 = +0.0000/-0.0006
>∅2.000 ≤∅3.000 = +0.0000/-0.0007
>∅3.000 ≤∅4.750 = +0.0000/-0.0008
>∅4.750 ≤∅7.000 = +0.0000/-0.0010
Shaft finish to be 125 micro inches or smoother.
Customer shaft diameter toIerance with Shrink Disc fit f6
(Iooser fit)
Metric (mm)
≤∅18 =-0.016/-0.024
>∅18 ≤∅30 = -0.020/-0.029
>∅30 ≤∅50 = -0.025/-0.036
>∅50 ≤∅80 = -0.030/-0.043
>∅80 ≤∅120 = -0.036/-0.051
>∅120 ≤∅180 = -0.043/-0.061
Inch
≤∅0.750 = -0.0006/-0.0011
>∅0.750 ≤∅1.125 = -0.0008/-0.0013
>∅1.125 ≤∅2.000 = -0.0010/-0.0016
>∅2.000 ≤∅3.000 = -0.0012/-0.0019
>∅3.000 ≤∅4.750 = -0.0014/-0.0023
>∅4.750 ≤∅7.000 = -0.0017/-0.0027
Shaft finish to be 125 micro inches or smoother
FLANGE MOUNTED UNITS
If a structuraI steeI foundation is used (i.e. wide fIange beams or
channeIs), a base pIate or soIe pIate of suitabIe thickness shouId
be used and shouId extend under the entire unit. If a buIk head
pIate is used it shouId be of proper strength to minimize buckIing
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.
LUBRICATE SHAFTS
Both the hollow shaft and the driven shaft should be liberally
lubricated before assembly. The unit must slide freely onto the
driven shaft. Do not hammer or force the unit into place. For
shrink disc, follow instructions below.

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AXIAL RETENTION
Each drive shaft must be retained in place relative to the gear
reducer. Or each gear reducer must be retained in place relative
to the drive shaft. Either way NORD recommends the use of
shaft shoulders, locking collars or FIXING ELEMENTS to axially
retain the shaft or gear reducer in position.
SET SCREWS
If set screws are used for axial retention, they should be tightened
evenly. Flats may be filed on the driven shaft and a thread-
locking adhesive used for more position retention.
SNAP RING RETENTION
Placing external snap rings on drive shafts must be performed
with caution. The groove, which the snap ring fits into, may
weaken the drive shaft causing premature failure. NORD does
not recommend this type of shaft retention.
THRUST PLATE
In applications, which are subject to high vibratory loads, a thrust
plate will provide greater resistance to axial movement. Follow
the manufacturer’s recommendations for assembly.
SHRINK DISC
If a shrink disc is used to secure a reducer hollow shaft to the
driven shaft, follow this assembly procedure. Start with the shrink
disc mounted onto the extension of the hollow shaft disc locking
bolts loosened.
1. Clean reducer bore and mating solid shaft to be free of any
lubricants or dirt.
2. Slide reducer onto the solid shaft until it is about half way
through.
3. Lubricate the remaining portion of the solid shaft with a #2
grease or similar lubricant. This part will be located under
the bronze bushing. Do not install grease under the
shrink disc gripping area. Finish installing the solid shaft
into the reducer hollow bore.
4. Finger tighten all shrink disc bolts. Now, moving a circular
pattern, tighten each shrink disc locking bolt 1/4 to 1/2 turn.
Do not use criss cross pattern. Continue tightening in the
same circular direction with 1/4 or 1/2 turn increments until
all bolts reach the specified bolt tightening torque. Bolt
tightening torque is shown on the shrink disc label for the
particular unit.
5. Run unit for 24 hours, then retighten shrink disc locking bolts
to the proper bolt torque as indicated above.
TORQUE REACTION ARM
On the shaft mount ‘Clincher’, torque is reacted through the
integral torque tab, which is part of the casting. Commonly,
NORD’s optional RUBBER BUFFER bushings are installed on
each side of the integral torque tab to dampen torque shocks and
allow for mis-alignment received from the machinery during
operation.
Torque arm connection fabrications should always be mounted
perpendicular to a line through the output shaft center and the
point at attachment of the torque arm to the unit housing. In this
position the minimum load on the attachment structure arm will be
experienced. The attachment structure must be rigid and may not
deflect under any load. Doing so will place extra loads on the
output bearings of the reducer.
PRIME MOVER MOUNTING
AIign the prime mover to the reducer-input shaft using shims
under the feet. Make sure that the feet are supported. DoweI the
prime mover to its foundation.
SHAFT CONNECTIONS
When connecting shafts to either the input or output of the
reducer, consider the foIIowing instructions.
FITS
CIearance or interference fits for coupIing hubs shouId be in
accordance with ANSI/AGMA 9002-A86 or as follows.
Output and Input shaft Diameter toIerance
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
Output and Input shaft DriII and tap 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
≤∅0.438 = #10-24 x 0.4 deep
>∅0.438 ≤∅0.813 = ¼-20 x 0.6 deep
>∅0.813 ≤∅0.938 = 5/16-18 x 0.7 deep
>∅0.938 ≤∅1.125 = 3/8-16 x 0.9 deep
>∅1.125 ≤∅1.375 = 1/2-13 x 1.1 deep
>∅1.375 ≤∅1.875 = 5/8-11 x 1.4 deep
>∅1.875 ≤∅3.250 = 3/4-10 x 1.7 deep
>∅3.250 = 1-8 x 2.2 deep
Outboard pinion and sprocket fits shouId be as recommended by
the pin sprockets with interference fits shouId be heated
according to the manufacturer’s recommendations, generaIIy
250°F to 300°F, (120°C to 150°C) before assembIing to the shaft.
LOCATION
CoupIing hubs shouId be mounted fIush with the shaft ends,
unIess specificaIIy ordered for overhung mounting. Pinions,
sprockets and sheaves shouId be mounted as cIose as possibIe
to the unit housing to minimize bearing Ioads and shaft
defIections.

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WARNING:
LOCK OUT POWER before any maintenance is performed.
Make absolutely sure that no voltage is applied while work is
being done on the gearbox.
The Autovent releases built-up air pressure from
inside the gearbox (Max. pressure 2 psi).
COUPLING ALIGNMENT
Shaft coupIings shouId be instaIIed according to the coupIing
manufacturer’s recommendations for gap, anguIar 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 unIess overhung mounting of the coupIing hub is
specified. The coupIing gap and shaft gap must be sufficient to
accommodate any anticipated thermaI or mechanicaI axiaI
movement.
ANGULAR ALIGNMENT
Insert a spacer or shim stock equaI to the required coupIing gap
between the coupIing hub faces and measure the cIearance using
feeIer gauges. Repeat this at the same depth at 90-degree
intervaIs to determine the amount of anguIar misaIignment.
PARALLEL ALIGNMENT
Mount a diaI indicator to one coupIing hub, and rotate this hub,
sweeping the outside diameter of the other hub. The paraIIeI
misaIignment is equaI to one-haIf of the totaI indicator reading.
Another method is to rest a straight edge squareIy on the outside
diameter of the hubs at 90-degree intervaIs and measure any
gaps with feeIer gauges. The maximum gap measurement is the
paraIIeI misaIignment.
CHECKING ALIGNMENT
After both anguIar and paraIIeI aIignments are within specified
Iimits, tighten aII foundation boIts secureIy and repeat the above
procedure to check aIignment. If any of the specified Iimits for
aIignment are exceeded, reaIign the coupIing.
SPROCKET OR SHEAVE ALIGNMENT
AIign the sheaves or sprockets square and paraIIeI by pIacing a
straight edge across their faces. AIignment of bushed sheaves
and sprockets shouId be checked after bushings have been
tightened. Check horizontaI shaft aIignment by pIacing 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
AIign the pinion by adjusting the gear tooth cIearance according
to the manufacturer’s recommendations and checking for
acceptabIe outboard pinion tooth contact. The foundation boIts
may have to be Ioosened and the unit moved sIightIy to obtain
this contact. When the unit is moved to correct tooth contact, the
prime mover shouId be reaIigned.
RECHECK ALIGNMENT
After a period of operation, recheck aIignment and adjust as
required.
1. Properly install unit on a rigid foundation
• adequateIy supported
• secureIy boIted into pIace
• IeveIed so as not to distort the gear case
2. Properly install couplings suitabIe 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 personneI and as required by the
appIicabIe standards of the OccupationaI Safety and HeaIth
Administration (OSHA), and by other appIicabIe safety
reguIations;
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
Owner has the responsibiIity 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, aIarms, 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, adjust the oil level
accordingly and relocate the vent plug, fill plug and drain
plug according to the mounting position. See following.
AUTOVENT PLUG
The Autovent plug is brass in color and will be located at the
highest point on the gearbox. It operates like a check-valve to
allow the reducer to relieve internal pressure while preventing
lubricant contamination during cooling. A spring presses a ball or
plunger against a machined orifice until pressure exceeds 2 psi.
Above 2 psi the air is allowed to escape depressurizing the
gearcase. When internal pressure drops below 2 psi, the
autovent re-seals closing the unit to the outside environment.
After shutdown, the reducer cools along with the air inside the
reducer. The unit will temporarily maintain a slight vacuum until
normalization occurs. NORD Gear supplies an Autovent as a
standard feature.

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Two types of plugs for maintenance
FILL LEVEL & DRAIN PLUGS
The drain plugs are metric socket head cap screws. They will be
located at the lowest part of the gearbox for ease of draining. The
fill level plug is a hex head cap screw. It will be located between
the Autovent and drain plug. Both types of plugs will have gaskets
included to prevent oil from leaking.
LUBRICANT
AII NORD reducers are shipped from the factory properIy fiIIed
with Iubricant and all plugs are installed according to the mounting
position given on the reducer nametag. Acceptable oil fill level is
within ½ inch of the bottom of the fill plug threads.
OPERATION AND MAINTENANCE CHECKLIST
1. Operate the equipment as it was intended to be operated
2. Do not overIoad.
3. Run at correct speed.
4. Maintain Iubricant in good condition and at proper IeveI.
5. Dispose of used Iubricant in accordance with appIicabIe
Iaws and reguIations.
6. AppIy proper maintenance to attached equipment at
prescribed intervaIs recommended by the manufacturer.
7. Perform periodic maintenance of the gear drive as
recommended by NORD.
MOUNTING POSITIONS
These charts detail the mounting positions for horizontal and vertical mounting. The Autovent, oil fill plug and drain plug are indicated on each
mounting position picture. The factory set mounting position and plug locations match that shown on the gearbox nametag. For mounting
orientations other than shown consult NORD Gear.

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MAINTENANCE
Mineral lubricant should be changed every 10,000 service hours or after two years. For synthetic oils, the lube should be changed every
20,000 service hours or after four years. In case of extreme operating (e.g. high humidity, aggressive environment or large temperature
variations), shorter intervals between changes are recommended.
OIL SPECIFICATIONS
NORD supplies aII reducers fiIIed with oiI from the factory. Consult the sticker adjacent to the fill plug to determine the type of lubricant
installed at the factory. Standard lubricant is ISO VG680 synthetic-based oil. However, some units have special lubricants designed to
operate in certain environments or to extend the service life of the lubricant. If in doubt about which lubricant is needed, contact NORD Gear.
WARNING FOR CONVEYOR APPLICATIONS USING WORM GEARBOXES
Conveyor applications using platic or rubber belts create a static electric load which can create an electro chemical process in the worm
gearbox. Using Poly Alkylene Glycol (PAG) oils can lead to a bronze plating process and extreme wear of the worm wheel. Proper electrical
grounding of the conveyor will resolve this issue. Or, if using a different oil is easier, filling the gearbox with a Poly Alpha Olefin (PAO) oil will
also work.
ALL WORM REDUCERS
Worm units have a combination of hard and soft gears. SIiding action of worm gears require a higher viscosity oiI. These units are furnished
with synthetic oiI as standard. CAUTION: Do not mix mineraI based and synthetic oiIs.
STANDARD OIL – ISO VG680
Ambient Temperature FormuIation
20 to 140°F (-5 to 60°C) Synthetic poIygIycoI
TYPICAL OILS
Viscosity
ISO NLGI Formulation
Service
Temperature
Range Shell Castrol
Synthetic
PAO
-25°C to +80°C
-13°F to +176°
F
Mobil
SHC 636 N/A N/A
Klübersynth
EG 4-680 N/A N/A
VG 680 Synthetic
PAG
-5°C to +60°C
23°F to +140°F
Glygoyle
HE 680 N/A N/A
Klübersynth
GH 6-680
Enersyn
SG-XP 680
Tribol
800/680
Synthetic
PAO
-30°C to +80°C
-22°F to +176°
F
Mobil
SHC 634
Omala
460 HD
Isolube
EP 460
Klübersynth
EG 4-460 N/A Tribol
1510/460
VG 460 Synthetic
PAG
-15°C to +80°C
5°F to +176°F
Glygoyle
HE 460 N/A N/A
Klübersynth
GH 6-460 N/A N/A
Synthetic
PAO
-40°C to +80°C
-40°F to +176°
F
Mobil
SHC 630
Omala
220 HD
Isolube
EP 220
Klübersynth
EG 4-220 N/A Tribol
1510/220
VG 220 Synthetic
PAG
-25°C to +20°C
-13°F to +68°F
Glygoyle
HE 220
Tivela
WB
Alphasyn
PG 220
Klübersynth
GH 6-220
Enersyn
SG-XP 220
Tribol
800/220
Synthetic
PAO
-40°C to +10°C
-40°F to +50°F
Mobil
SHC 629
Omala
150 HD
Isolube
EP 150
Klübersynth
EG 4-150 N/A N/A
VG 150
&
VG 100 Synthetic
PAG
-25°C to +20°C
-13°F to +68°F N/A N/A N/A
Klübersynth
GH 6-150 N/A N/A
PAO = Poly Alpha Olefin / PAG = Poly Alkylene Glycol
STANDARD BEARING GREASE – NLGI 2 Synthetic
Ambient Temperature FormuIation
-40 to 230°F (-40 to 110°C) Synthetic

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LUBRICANT CAPACITY
Each reducer has the oil level and oil quantity adjusted according to the mounting position shown in the tables. When replacing the oil, consult
the tables below to determine the proper amount of oil to be installed according to the reducer size and mounting position. Note that this is
approximate and the final level will be adjusted when the reducer is installed. Acceptable oil fill level is within ½ inch of the bottom of the fill
plug threads.
B3 B6I B8 V1/V5I V6/V6I B3I B6 B6II B8I B5I B5III V1 V3 B5 B5II H1 H2 H5 H6 H3 H4
SK 02040 quarts 0.48 0.48 0.63 0.53 0.53 0.63 0.63 0.69 0.63 0.53 0.79 0.53 0.53 0.85 0.63 0.42 0.69 0.53 0.53 0.63 0.85
liters 0.45 0.45 0.60 0.50 0.50 0.60 0.60 0.65 0.60 0.50 0.75 0.50 0.50 0.80 0.60 0.40 0.65 0.50 0.50 0.60 0.80
SK 02050 quarts 0.63 0.63 0.74 0.74 0.74 1.22 1.27 1.22 1.27 0.48 0.95 1.06 1.06 1.48 1.32 0.48 0.95 0.85 0.85 1.16 1.16
liters 0.60 0.60 0.70 0.70 0.70 1.15 1.20 1.15 1.20 0.45 0.90 1.00 1.00 1.40 1.25 0.45 0.90 0.80 0.80 1.10 1.10
SK 12063 quarts 0.42 0.42 1.27 1.06 1.06 1.64 1.80 1.64 1.80 0.53 1.48 1.59 1.59 1.69 1.90 0.53 1.27 1.16 1.16 1.48 1.53
liters 0.40 0.40 1.20 1.00 1.00 1.55 1.70 1.55 1.70 0.50 1.40 1.50 1.50 1.60 1.80 0.50 1.20 1.10 1.10 1.40 1.45
SK 12080 quarts 0.85 0.85 1.80 1.80 1.80 2.85 2.75 2.85 2.75 1.00 2.64 2.64 2.64 3.49 3.91 0.95 3.17 2.33 2.33 3.17 3.28
liters 0.80 0.80 1.70 1.70 1.70 2.70 2.60 2.70 2.60 0.95 2.50 2.50 2.50 3.30 3.70 0.90 3.00 2.20 2.20 3.00 3.10
SK 32100 quarts 1.69 1.69 3.59 3.38 3.38 5.71 5.81 5.71 5.81 1.59 5.18 4.65 4.65 7.50 7.50 1.59 4.02 4.02 4.02 5.60 5.50
liters 1.60 1.60 3.40 3.20 3.20 5.40 5.50 5.40 5.50 1.50 4.90 4.40 4.40 7.10 7.10 1.50 3.80 3.80 3.80 5.30 5.20
SK 42125 quarts 2.96 2.96 6.55 6.13 6.13 10.89 11.63 10.89 11.63 3.49 6.45 7.19 7.19 11.84 10.99 3.38 6.45 6.66 6.66 11.10 13.64
liters 2.80 2.80 6.20 5.80 5.80 10.30 11.00 10.30 11.00 3.30 6.10 6.80 6.80 11.20 10.40 3.20 6.10 6.30 6.30 10.50 12.90
SK 13050 quarts 1.00 1.00 1.16 1.00 1.00 1.53 1.64 1.53 1.64 0.95 1.22 1.32 1.32 1.90 1.85 0.90 1.32 1.22 1.22 1.43 1.85
liters 0.95 0.95 1.10 0.95 0.95 1.45 1.55 1.45 1.55 0.90 1.15 1.25 1.25 1.80 1.75 0.85 1.25 1.15 1.15 1.35 1.75
SK13063 quarts 0.90 0.90 1.69 1.32 1.32 2.11 2.43 2.11 2.43 1.00 1.74 1.85 1.85 2.22 2.27 0.95 1.64 1.53 1.53 2.22 2.22
liters 0.85 0.85 1.60 1.25 1.25 2.00 2.30 2.00 2.30 0.95 1.65 1.75 1.75 2.10 2.15 0.90 1.55 1.45 1.45 2.10 2.10
SK 13080 quarts 1.80 1.80 2.22 2.06 2.06 3.59 3.38 3.59 3.38 1.48 2.91 2.91 2.91 4.44 4.44 1.80 3.81 2.70 2.70 3.81 3.96
liters 1.70 1.70 2.10 1.95 1.95 3.40 3.20 3.40 3.20 1.40 2.75 2.75 2.75 4.20 4.20 1.70 3.60 2.55 2.55 3.60 3.75
SK 33100 quarts 2.22 2.22 4.23 3.91 3.91 7.19 8.03 7.19 8.03 2.43 5.81 5.13 5.13 8.03 8.24 2.22 5.07 4.44 4.44 6.98 6.45
liters 2.10 2.10 4.00 3.70 3.70 6.80 7.60 6.80 7.60 2.30 5.50 4.85 4.85 7.60 7.80 2.10 4.80 4.20 4.20 6.60 6.10
SK 43125 quarts 8.24 8.24 7.61 7.08 7.08 14.27 14.80 14.27 14.80 4.55 7.50 8.14 8.14 13.64 12.79 5.07 7.82 8.46 8.46 15.33 14.27
liters 7.80 7.80 7.20 6.70 6.70 13.50 14.00 13.50 14.00 4.30 7.10 7.70 7.70 12.90 12.10 4.80 7.40 8.00 8.00 14.50 13.50
Note: Filling quantities are approximate figures. Oil level must be checked according to oil level plug after final installtion.
A
cceptable oil fill level is within 1/2 inch of the bottom of the fill plug threads. For mounting angles not shown, consult factory.
OIL FILL QUANTITIES
Vertical
SHAFT MOUNT UNIT
Horizontal Vertical
FOOTED UNIT
Horizontal
FLANGED UNIT
Horizontal Vertical

BIM 1030/2005/03 9 www.nord.com
PARTS LIST
RECOMMENDED SPARE PARTS
Bearings – all
Seals – all
Gaskets – all
Seal Plugs – all
Shims – all
IMPORTANT!
When ordering parts, it is necessary to have the NORD SERIAL NUMBER from the unit the parts are for. The serial
number will dictate the correct parts for that particular unit. The gearbox nameplate will have the serial number on it.

BIM 1030/2005/03 10 www.nord.com
PARTS LIST
SK 02050 A
-
SK 4212
5
A
Shaft mount ed
SK13050 - SK 43125
Wor m geared mot or t rip le reduct io n
5 Driving gear
6 Driving pinion
27 Bolt
28 Seal
29 Supporting disc
30 Third reduction
gearcase
45 Ball bearing
46 Key
48 Ball bearings
52 Circlip
53 Key
54 Circlip
55 Intermediate shaft,
plain
56 Intermediate shaft,
gearcut
57 Circlip
58 Circlip
59 Shim
60 Circlip
61 Circlip
62 Plug
63 Seal
301 Worm wheel
302 Worm
305 Driving gear
306 Driving pinion
307 Hollow shaft
309 Shaft seal
310 Shaft seal
311 Circlip
312 Shim
313 Ball bearing
314 Seal
315 Gearcase cover
316 Drain plug
317 Vent screw
318 Seal
319 Socket head screw
320 Key
322 Spacer
323 Flanged eye bolt
324 Gear caser
325 Seal
328 Locking cap
329 Supporting disc
332 Circlip
333 Key
334 Circlip
335 Shim
336 Supporting disc
337 Angular ball bearing
340 Disc
341 Washer
342 Socket head screw

BIM 1030/2005/03 11 www.nord.com
PARTS LIST

BIM 1030/2005/03 12 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
Worn RV Disc Overloading unit may result in
damage to disc
Disassemble and replace disc. Recheck
rated capacity of reducer.
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
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.