Grove Gear Cast Iron – Narrow (NH Series) User Manual
of current production.
• If the speed reducer cannot be located in a clear and dry area with access to
adequate cooling air supply, then precautions must be taken to avoid the ingestion
of contaminants such as water and the reduction in cooling ability due to exterior
• Mounting bolts should be routinely checked to ensure that the unit is firmly
anchored for proper operation.
In the event of the resale of any of the goods, in whatever form, Resellers/Buyers will include the following
language in a conspicuous place and in a conspicuous manner in a written agreement covering such sale:
The manufacturer makes no warranties or representations, express or implied, by
operation of law or otherwise, as to the merchantability or fitness for a particular
purpose of the goods sold hereunder. Buyer acknowledges that it alone has deter-
mined that the goods purchased hereunder will suitably meet the requirements of
their intended use. In no event will the manufacturer be liable for consequential,
incidental or other damages. Even if the repair or replacement remedy shall be
deemed to have failed of its essential purpose under Section 2-719 of the Uniform
Commercial Code, the manufacturer shall have no liability to Buyer for consequential
Resellers/Buyers agree to also include this entire document including the warnings above in a con-
spicuous place and in a conspicuous manner in writing to instruct users on the safe usage of the product.
This instructions manual should be read together with all other printed information such as catalogs, supplied by
Grove Gear / Electra-Gear.
1. Run the motor which drives the reducer and check the direction of reducer output rotation. Consult
motor nameplate for instructions to reverse the direction of rotation.
2. Attaching the load: On direct coupled installations, check shaft and coupling alignment between
speed reducer and loading mechanism. On chain/sprocket and belt/pulley installation, locate the
sprocket or pulley as close to the oil seal as possible to minimize overhung load. Check to verify that
the overhung load does not exceed specifications published in the catalog.
to the speed reducer output shaft or the driven mechanism.
The system of connected rotating parts must be free from critical speed,
torsional or other type vibration, no matter how induced. The responsibility
for this system analysis lies with the purchaser of the speed reducer.
base feet which do not lie flat against the mounting surface.
2. For shipment, pipe plugs are installed in the unit and a vent plug is packed separately.
After mounting the unit in position, remove the appropriate pipe plug and install the vent
plug in the location shown on page 5. On double reduction units both the primary and the
secondary must be vented. Failure to vent the unit can cause premature seal wear or
loss of seal and oil. These conditions are not covered by warranty. Check for correct oil
level. Contact the Factory for level and vent recommendations on non-standard mounting
3. Connect motor to speed reducer.
Depending upon gear geometry and operating conditions worm gear reducers may or may not back-
drive. Use of a brake or external holding device is required if any evidence of backdriving is not desired.
Specialconsiderationshouldbegiventohighinertia loads connected to the output shaft. Consult the
factory for further details.
Altering the mounting position may require special lubrication provisions which
must be factory installed.
Do not operate the reducer without making sure it contains the correct amount
equipment may result.
A unit cannot be used as an integral part of a machine superstructure which would
impose additional loads on the unit other than those imposed by the torque
being transmitted either through a shaft-mounted arrangement, and any shaft
mounted power transmitting device.
(e.g., sprockets, pulleys, couplings)
For safe operation and to maintain the unit warranty, when changing a factory
installed fastener for any reason, it becomes the responsibility of the person
making the change to properly account for fastener grade, thread engagement, load,
tightening torque and the means of torque retention.
Lubrication - Standard and
/ Platinum Units
Change Intervals: Standardcompoundedlubricants(non-synthetic)shouldbechangedeverysixmonths
only when performing maintenance that requires gearbox disassembly.
Oil should be changed more often if reducer is used in a severe environment (i.e. dusty,
In the Food and Drug Industry (including animal food), consult the lubrication
Administration and/or other authoritative bodies having jurisdiction. Factory supplied
Do not mix different oils in the reducer. Grove Gear / Electra-Gear reducers are
shipped standard with PAG lubricant – this lubricant is not compatible with conventional
Special Lubrication Requirements - Size 818 and Larger
lubricants of the proper viscosity to maintain trouble-free performance. All standard reducers ordered
fromthefactoryarefilledwithISOviscositygrade460polyglycol(PAG) lubricant. If oil needs to be
added or changed, ONLY compatible polyglycol lubricants should be used. Contact the factory for
Oil Capacities (ounces) - Standard Units
Always check for proper oil level after filling. Capacities vary somewhat with model and
813 815 818 821 824 826 830 832 842 852 860 870*
4 12 12 20 24 40 56 72 112 188 312 560
8 16 20 28 40 60 84 108 152 304 328 524
4 16 16 28 32 48 68 88 128 248 320 332
4 16 16 24 32 48 72 92 128 248 325 584
N/AN/AN/A N/AN/A N/AN/A 8 12 17 27
N/AN/AN/A N/AN/A N/AN/A 192 308 320 485 805
6 14 18 26 32 50 78 98 N/A N/A N/A N/A
Standard Gear Reducer Mounting Positions
& Vent Plug, Level and Drain Locations s
Double Reduction Worm-Worm
* Size 842 - 860 (far side plug).
Note: High oil level applies to all size 842 & larger
secondary & tertiary units regardless of primary
(All primary units have
their own oil level.)
Maintenance - Standard Units
Your Grove Gear / Electra-Gear reducer has been tested and adjusted at Factory. Dismantling or
replacement of components must be done by Grove Gear / Electra-Gear to maintain the warranty.
position chart) add proper lubrication through the filler plug until it comes out the oil level plug.
Inspect vent plug often to insure it is clean and operating.
personnel, reducer, or other equipment may result.
Seals: The Grove Gear / Electra-Gear line of speed reducers utilizes premium quality seals which are the
Replacement can be easily accomplished by following the steps below:
Remove the worn seal without damaging the shaft surface or the seal bore. This can be done by
Clean the seal bore of sealant.
Before installing the new seal, use electrical tape to cover any keyways on the shaft to prevent
seal lip damage.
the seal square in its bore.
or units with Enviroseal option.