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ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
Introduction
The Aluminum Worm Gear Speed Reducer is a new product combining the advanced technology of
our cast iron speed reducers with a new aluminum body.It is ideal for applications requiring a
reduced output speed, increased torque or change in drive direction.
USE AND SAFETY GURANTEE
• Do not exceed the maximum input horsepower rating.
• This speed reducer is shipped with oil and it does not need to be filled before it is used.
• During installation make sure not to damage the oil seals on the input or output shaft.
• Make sure the input and output shaft are the correct rotation before turning on the electric motor.
This will prevent damaging the speed reducer or any of the other components.
• Install safety covers over any open rotating shafts to prevent injuries from occurring
Features
• Aluminum heat sinking designed housing with epoxy coating
• Lightweight and rust resistant
• The compact design requires less mounting space
• Completely sealed against dust, dirt and other contaminates
• High torque output with low noise and reduced vibration
Specifications
ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
Item No.: 8607384 & 8607392
SKU No.
8607384
8607392
Model No.
NRV-40-100-1
NRV-50-60-1
Ratio
100:1
60:1
Max. Input HP
Max. Torque Output (in-lb)
Max. Input Shaft Side Load (lbs)
Hollow Output Shaft Dia. (in.)
Max. Input Shaft Speed (RPM)
Efficiency
Max. Input HP
Max. Torque Output (in-lb)
Max. Input Shaft Side Load (lbs)
Hollow Output Shaft Dia. (in.)
Max. Input Shaft Speed (RPM)
Efficiency
1/4 HP
460
79
3/4
1,800
75%
1/2 HP
513
110
1
1,800
75%
Specifications
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ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
SKU No.
8607384
8607392
MODEL No.
NRV-40-100-1
NRV-50-60-1
RATIO
100:1
60:1
A
6.50
7.54
B
4.53
5.17
C
1.18
1.57
D
4.78
5.67
E
0.84
1.12
F
2.36
2.76
G
3.07
3.62
H
2.76
3.15
SKU No.
8607384
8607392
MODEL No.
NRV-40-100-1
NRV-50-60-1
RATIO
100:1
60:1
INPUT SHAFT(DIA.) I
1/2
5/8
HOLLOW OUTPUT SHAFT(DIA.) J
3/4
1
K
3/16
1/4
Installation Dimensions(Inch)
Exploded Parts View
Part No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Parts Name
Housing
Hex Head Cap Screw
Input Shaft Cap
Input Shaft Bearing
O-ring
Oil Drain Plug
Steel Plug
Hex Head Cap Screw
Output Bearing Carrier Cap
O-ring
Output Hollow Shaft Seal
Output Hollow Shaft Bearing
Ring Gear
Output Hollow Shaft
Input Shaft Cap
Input Shaft Oil Seal
Input Shaft Key
Worm Gear Input Shaft
Parts Quantity
1
6
1
2
2
1
1
8
1
1
2
2
1
1
1
1
1
1
42
11
1
8
910 11 12
12
13
6
14
35 4
7
16
18
5
17
15
A
F
G
B
E
H
C
J
K
I
D
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ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
Read these instructions thoroughly before installing or operating the gearbox.
GENERAL INSTALLATION INSTRUCTIONS
• Leave the protective shaft sleeves in place for safe handling of the gearbox during installation.
• This speed reducer is tested and filled with synthetic oil prior to shipment (Refer to the Lubrication
and Maintenance section for more information.)
• Align all shafts accurately, since improper alignment can result in premature failure.
• For hollow-bore output gearboxes – Use anti-seize compound when inserting the load shaft into
the Hollow Output Shaft. It is preferable to size the load shaft with sufficient length to allow
complete insertion through the Hollow Output Shaft of the gearbox. This allows equal support of
the load shaft by both of the output shaft bearings, and permits the use of the output shaft set
screws to lock the two shafts together on both sides of the gearbox. At minimum, the load shaft
should be inserted at least half way into the hollow output shaft, and secured with the setscrews
on the insertion end of the gearbox.
• Mount the gearbox to a rigid foundation, and use the maximum possible bolt size. Periodically
inspect the mounting bolts. (Refer to the Lubrication and Maintenance section for allowable
mounting orientations.)
• Mount auxiliary drive components such as sprockets, gears and pulleys on the gearbox shafts as
close to the housing as possible in order to minimize the effects of side loading. Avoid force fits
that might damage bearings or gears.
• Check and record gear backlash at installation and again at regular intervals. This should be done
by measuring the degrees of rotary movement of the output shaft (rotating alternately clockwise
and counterclockwise) while holding the input shaft stationary. The gearbox should be replaced
when the backlash exceeds four times the measurement taken at installation.
• Initial operating temperatures may be higher than normal during the break-in period of the gear
set.For maximum life, DO NOT ALLOW THE SPEED REDUCER TO OPERATE CONTINUOUSLY
ABOVE 225°F at the gear case. In the event of overheating, check for overloads or high ambient
temperatures. Keep shafts and vent plugs clean to prevent foreign particles from entering seals or
gear housing.
Preparing the Area
Clean the work area until it is free of debris and dust before disassembling the Reducer.
Contaminates can adhere to oil coating the parts and may damage the mechanism. Have a clean
container ready to place the parts during the disassembly process.
Tools Required
• 6mm Allen Wrench
• Torque Wrench
When this manual refers to a part name, please refer to the Exploded Parts View on Page 2.
Removal and Installation of the Ring Gear Output Hollow Shaft Assembly
Removal:
To remove the Ring Gear Output Hollow Shaft Assembly you need to remove the Worm Gear Input
Shaft Assembly first.
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ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
1. Remove the Oil Drain Plug (#6) to completely drain the oil.
2. Remove the Hex Head Cap Screws (#8) from the Output Bearing Carrier Cap (#9)
3. CAREFULLY slide the Front Output Bearing Carrier Cap (#9) off of the Output Hollow Shaft (#14)
4. The Ring Gear Output Hollow Shaft Assembly ((#13, #14, #12)) can now be removed from the
Housing (#1)
Note: Be careful not to nick or scratch the ring gear or output Hollow shaft
Replacing the Ring Gear:
1. Place the Ring Gear Output Hollow Shaft Assembly into a press and remove the rear Output
Bearing (#12) and Ring Gear (#13) from the Output Hollow Shaft (#14)
2. Press on the new Ring Gear (#13) and then the rear Output Shaft Bearing (#12)*
*Make sure the Output Hollow Shaft Assembly is tight with no spaces between the components
Installation:
To install the Ring Gear Output Hollow Shaft Assembly into the housing you need to install the
Worm Gear Input Shaft Assembly at the same time so they can be meshed together.
1. Install the Ring Gear Output Hollow Shaft Assembly into the Housing (#1)
2. Slide the Output Bearing Carrier (#9) over Output Hollow Shaft (#14) and bolt it to the housing
with the Hex Head Cap Screws (#8) and torque them to 225 in. lbs.
Removal and Installation of the Worm Gear Input Shaft Assembly
Removal:
1. Remove the Hex Head Cap Screws (#2) from the Input Shaft Cap (#15)
2. CAREFULLY remove the Input Shaft Cap (#3) and the Input Shaft Cap (#15)
3. Remove the Worm Gear Input Shaft Assembly (#18) by gently tapping it on one end of the shaft
with a rubber mallet until it comes out the other side of the housing
Note: The Worm Gear Input Shaft Assembly (#18) can not be switched to the other side
Installation
1. Place the Worm Gear Input Shaft Assembly (#4,18,) back in the Housing (#1) in its original
configuration
2. Install the O-ring (#5) on each side of the Housing (#1)
3. Slide the Input Shaft Cap over Input Shaft (#18) and bolt it to the housing with the Hex Head Cap
Screws (#2) and torque them to 225 in. lbs.
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ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
CAUTION
-Worm Gear Speed Reducers are Not To Be Considered a Fail Safe Or Self-Locking Devices. If These
Features Are Required, A Properly Sized Independent Holding Device Should Be Utilized.
-Depending Upon Gear Geometry and Operating Conditions, Worm Gear Speed Reducers May Or
May Not Back Drive. Special Consideration Should Be Given To High Inertia Loads Connected
To The Reducer Output Shaft.
-Reducers Driven By Brake Motors Must Be Sized To Accommodate Motor Driving and Brake and
Inertia Loads To Prevent The Braking Torque Or Inertia Loads From Exceeding The Motor Rating.
2. Lubrication and Maintenance
2.1 Lubrication
This speed reducer is shipped with oil and it is not necessary to fill it before use.
2.2 Oil Changes
The Speed Reducer is shipped to you filled with synthetic lubricant which should be changed every
6,000 hours of operation or every 2 years, which ever comes first.
It is very important to use the proper lubricant type. It is also very important to keep the oil free
from oxidation and contamination by water or debris.
1. Remove the oil Drain Plug (#6) to completely drain out the oil.
2. Replace the Drain Plug (#6) and remove the Steel Plug (#7). Refill with 10.14 oz. of recom-
mended gear oil.
3. Install the Steel Plug (#7) and torque to 195 in. lbs.
Note: If you fill the speed reducer with a synthetic lubricant, please use the original steel plug (see
fig.1).If you fill the speed reducer with a mineral lubricant, please use the supplied plastic air vent
for air bleeding (see fig.2).
1. Remove the Steel Plug (#7).
2. Replace with the supplied plastic air vent and torque to 195 in. lbs.
ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
Installation
1.1 Motor and Speed Reducer
RV series speed reducers are shipped with oil so they do not need to be filled before use.
1.2 Motor Wiring
To Power Supply
Connection of the electric motor to the power supply should be made by a qualified electrician. The
current rating of the motor will be identified on the motor plate, and the correct sizing of the wire to
meet electrical regulations is essential.
1.3 Mounting The Speed Reducer
To mount the speed reducer feet to the equipment use 3/8" UNC bolts (Minimum ISO grade 8.8) and
torque them to 750 in-lbs.
It can either be free standing by foot mounting, or if required, mounted on a standard base-plate
with a foot mounted motor correctly aligned
a) Align the Speed Reducer
Note: It is important to insure when aligning the speed reducer on the base-plate that all machined
mounting points are supported over their full area.
During the final assembly insure the unit or base-plate are not distorted. This will cause strain on
the gear case resulting in the possible misalignment of the shafts and gearing.
b) Install safety guards in accordance with local regulations
c) Check the motor wiring diagram for the correct direction of rotation. This is important when a
load holding device has been added.
original steel plug supplied plastic air vent
fig.1 fig.2
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ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
Problem (s)
Overheating
Vibration
Noise
Oil Leakage
Tooth surface of the
worm gear sets
abrades quickly
Possible Cause (s)
1.Improper alignment between
the prime mover, speed reducer
or operating device
2.Overloading
3.Excessive friction of the output
shaft oil seal
4.The gear oil is over or under
filled
5.The oil is very contaminated or
of inferior quality
1. The prime mover, speed
reducer or the operating device is
not mounted properly
2. The tooth surface of the worm
gear set is worn-out or damaged
3. A bearing is worn-out
1. A bearing is damaged or worn
2. The worm gear set is not
meshing properly
3. The oil level is low
4. Contamination inside the gear
housing
1. The oil seal lip is worn-out
2. The shaft is worn in the area of
the oil seal
3. The oil level is to high
4. The oil drain plug is loose
1. Overloading
2. The oil does not conform
to the recommended standards
3. The oil level is low
4. The oil is contaminated and
needs replaced
5. Overheating while running
Suggested Solution (s)
1. Adjust installation position to
make all components align
2. Adjust load or replace with a
suitable type of speed reducer
3.Lubricate the output shaft oil
seal
4.Adjust to the proper oil level
using oil sight glass
5.Change the oil and replace with
the recommended type
1. Isolate the loose bolts and
tighten
2.Replace the worm gear set
3.Replace the bearing
1. Replace the bearing
2. Mend the tooth surface or
replace the worm gear set
3. Adjust to the proper oil level
using oil sight glass
4.Drain out the dirty oil and
replace with the recommended
type
1.Replace the oil seal
2.Replace input or output shaft
3. Adjust to the proper oil level
using oil sight glass
4.Remove the oils drain plug,
coat with sealant and reinstall
1.Adjust load or replace with a
suitable type of speed reducer
2.Replace with approved oil
3. Adjust to the proper oil
level using oil sight glass
4.Change the oil and replace with
the recommended type
5. Adopt preventative measure to
make the ambient temperature
lower
Size:145x210mm REV 04/07/15 2.09.05.30.569
ALUMINUM WORM GEAR SPEED REDUCER
INSTRUCTION MANUAL
2.4 Lubricant Capacity and Mounting Orientation
Troubleshooting
Contact Princess Auto Ltd. for a solution if the speed reducer does not function properly or parts
are missing. If unable to do so, have a qualified technician service the device.
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Aluminum Speed Reducer Lubricant Capacities
This speed reducer has been filled with oil and tested. You do not need to add oil before it is used.
Speed Reducer Mounting OrientationSpeed Reducer Mounting Orientation
8607384 Approx Capacity(fl oz)
8607392 Approx Capacity(fl oz) 5.07
2.70
A B C D E
A
Ambient
Temperature
-30℃ to 5℃
(-22 ℉ to 41℉)
5℃ to 25℃
(41 ℉ to 77℉)
25℃ to 40℃
(77 ℉ to 104℉)
40℃ to 65℃
(104 ℉ to 149℉)
Load
Normal
Heavy-duty
Normal
Heavy-duty
Normal
Heavy-duty
Normal
Heavy-duty
Oil Viscosity
(ISO)
VG-100
VG-150
VG-220
VG-320
VG-320
VG-460
VG-460
VG-680
Oil Viscosity
(SAE Gear Oil)
85
90
90
140
140
140
140
250
B C D E F
Speed Reducer Mounting Orientation
Horizontal Input Shaft Vertical Input Shaft
- Oil filling hole
/
