Boston gear 700 Series Owner's manual

Worm Gear Speed Reducers
Installation and Operation
P-3009-BG
Doc. No. 57746 700 Series
Single and Double
Reductions
An Altra Industrial Motion Company

2Boston Gear 700 Series P-3009-BG Doc. No. 57746
California Proposition 65 Warning: The Bronze
gear and wear debris found inside any worm
gearbox contains lead, a chemical known to the
state of California to cause cancer, birth defects or
other reproductive harm.
Inadequate lubrication is by far the largest
contributor to premature failures of worm gear drives,
applied within proper selection practice.
While lubricant selection is important to all gear
reducers, it is critical for the worm gear type. Sliding
action at the tooth mesh dictates use of a relatively
high viscosity oil with special characteristics. A recent
survey indicated improper lubricants were used in two-
thirds of the applications. Although lightly loaded drives
may survive, optimum performance is not obtained.
Boston Gear now offers Klubersynth UH1 6-460
Synthetic Lubricating Oil as a premium lubricant with
many outstanding benefits for worm gear applications.
• Reduction in maintenance costs due to
extended time between oil changes.
• Increased ratings providing for smaller drive
selection or longer gear life.
• Lower energy consumption from improved
efficiency.
• Broad ambient temperature range due to high
viscosity temperature.
• Longer seal life, based on lower operating
temperature.
• Multi-purpose application, including most
other types of gear drives.
• Oil Type is PAG (polyalkylene Glycol)
Different oil types must not be mixed.
For Example: PAG types such as Kluber UH1 6-460
must not be mixed with PAO types such as Mobil
SHC products.
Lubrication Instructions
Scan to Watch
Gearbox Lubrication Video
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Boston Gear speed reducers are
commonly shipped without lubricant. They must
be filled to the proper level with the
recommended lubricant for your application
before operation. Please review the catalog
number on the product nameplate (pages 24-27)
to determine if the unit is prelubricated and verify
the mounting position is correct. Different
mounting positions require different oil levels and
seal configurations.
The recommended lubricant table indicates the type
and viscosity of lubricant suitable for reducers
operating at various temperatures.
Lubrication and maintenance instructions are
provided with each speed reducer. These
instructions should be followed for best results. It is
important that the proper type of oil be used since
many oils are not suitable for the lubrication of worm
gears. Various types of gearing require different types
of lubricants.
The lubricant must remain free from oxidation and
contamination by water or debris, since only a very thin
film of oil stands between efficient operation and failure.
To assure long service life, the reducer should be
periodically drained (preferably while warm) and refilled
to the proper level with a recommended lubricant.
Under normal environmental conditions oil changes are
suggested after the initial 250 hours or every 6 months.
Synthetic lubricants will allow extended lubrication
intervals due to its increased resistance to thermal and
oxidation degradation. It is suggested that the initial

Boston Gear 700 Series P-3009-BG Doc. No. 57746 3
oil change be made at 1500 hours and, thereafter, at
5000 hour intervals.
During the initial period of operation, higher than
normal operating temperatures may be seen. This
is due to the initial break-in of the worm gear set.
The temperature of Double Reduction Worm Gear
Reducers may reach 160°F and Single Reduction
Worm Gear Reducers approximately 225°F.
These instructions must be read thoroughly before
installing or operating speed reducers. File
instructions for future reference and for ordering of
replacement parts.
General Instructions
1. Align all shafts accurately. Improper alignment
can result in failure. Use of flexible couplings is
recommended to compensate for slight
misalignment.
2. When mounting, use maximum possible bolt
size and secure reducer to a rigid foundation.
Periodic inspection of all bolts is recommended.
3. Auxiliary drive components (such as sprockets,
gears and pulleys) should be mounted on the
shafts as close as possible to the housing to
minimize effects of overhung loads. Avoid
force fits that might damage bearings or gears.
4. For hollow-shaft speed reducers, place speed
reducer as close as possible to supporting
bearing on drive shaft. Spot-drill driven shaft
for setscrews in severe applications. See kit
instructions for reaction rod assembly.
5. Check and record gear backlash at installation
and again at regular intervals. This should be
done by measuring the rotary movement of the
output shaft (rotating alternately clockwise and
counterclockwise) at a suitable radius while
holding the input shaft stationary. Gears should
be replaced when the backlash exceeds four
times the measurement taken at installation.
6. Gear drives are rated for 1750 input RPM and
Class I Service (Service Factor 1.0), using
Klubersynth UH1 6-460 synthetic lubricant. For
lower input speeds or for different service
classes or lubricants, see catalog selection
pages for rating information.
7. 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.
8. Keep shafts and vent plugs clean to prevent foreign
particles from entering seals or gear housing.
9. All reducers should be checked to see if they
have been lubricated. Prelubed 700 Series
reducers will have a solid plug in the vent hole
which must be replaced by the vent plug at
time of installation unless the unit has a Posivent.
If the motor does not readily seat
itself, check to determine if key has moved axially
along motor shaft, causing interference. Staking
of the keyway adjacent to the motor key will
facilitate this procedure.
Key Staking Instructions
Lightly tap area of keyway adjacent to key. This will
upset material and not allow key to move axially when
assembling to speed reducer.
Shaft
• For safe operation of any gear drive, all rotating
shafts and auxiliary components must be
shielded to conform with applicable safety
standards. You must consider overall
operational system safety at all times.
• When using a speed reducer to raise or lower a
load, such as in hoisting applications,
provision must be made for external braking.
Under no conditions should a speed reducer be
considered self-locking.
• Mounting of speed reducers in overhead
positions may be hazardous. Use of external
guides or supports is strongly recommended
for overhead mounting.

4Boston Gear 700 Series P-3009-BG Doc. No. 57746
Instructions for Flanged Models
F700 (Quill Type Input)
1. Coat input bore with anti-seize compound. Do not
apply anti-seize compound to the motor shaft or
the reducer shaft. Some anti-seize compounds are
very abrasive and can accelerate seal wear.
2. Assemble the key to the motor shaft. Insert the
motor shaft into the reducer bore. Do not move the
motor side-to-side during assembly.
3. Verify the motor is seated completely against the
gearbox flange. If the motor is not completely
seated remove the motor and identify the
obstruction. Do not force the motor into the
gearbox.
4. Rotate the motor to proper position and firmly
secure to flange with four hex-head cap screws
Scan to view
Proper Motor Installation Video
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RF700 (Coupling Input – 3-Jaw Type)
1. Coat both coupling bores with anti-seize
compound. Remove excess anti-seize compound.
2. Position coupling half on input shaft with shaft
flush to end of coupling bore.
3. Locate remaining half on motor shaft, with 1/32”
clearance between jaw surfaces.
4. Tighten setscrews securely. For reversing
applications, a thread-locking compound is
recommended.
5. Install coupling insert and position motor. Rotate
the motor to the correct clock position and confirm
the motor mounting face contacts the gearbox
flange face completely. Secure motor to the flange
with the supplied motor bolts.
QC700 (Coupling Input-3-Jaw Quick
Connect Type)
1. Coat both coupling bores with anti-seize
compound. Remove excess anti-seize
compound.
2. Install motor coupling half onto motor shaft. Use
a straight edge to align coupling jaw top end
flush with motor shaft except QC738 units with
B9 bore codes - or - QC738 units with NEMA
180TC/210C motor frames which will be flush
with bottom of jaw. Secure with set screw.
3. Install urethane spider insert on motor coupling
half.
4. Insert D-Bore coupling half into urethane spider
element.
5. Rotate reducer input shaft so “milled flats” are
either vertical or parallel. Rotate motor coupling
D-Bore to match the reducer milled flats.
6. Insert motor assembly into reducer flange
assembly. Minor rotating of the motor may be
necessary to facilitate D-Bore alignment.
7. Once aligned, push motor towards reducer until
properly seated against the face of the reducer
flange.
8. Confirm the motor face is completely seated
against the gearbox flange. If it does not seat
completely adjust the position of the motor
coupling half.
9. Insert (4) hex head cap screws into the
designated locations and securely tighten.

Boston Gear 700 Series P-3009-BG Doc. No. 57746 5
Oil Capacities
Single Reduction Models Only
Oil Levels for typical mounting positions
WG.0007
FLOOR FLOOR
FLOOR FLOOR
1
24
HORIZONTAL INPUT SHAFT
3
6
FLOOR
FLOOR
5
VERTICAL INPUT SHAFT
WG.0008
Double input seals are recommended for
mounting positions 2,3,4,6 for the longest seal
life. See catalog nomenclature on page 24 for
the “T” designation required for double input
seals.
Avoiding those positions where
the high speed oil seal is immersed in oil will
provide greater security against high speed
input seal wear.
Cast Iron Oil Capacity in Fluid Ounces
Unit
Size
Positions
1 2 3 4 5 & 6
710 2.2 3.3 3.3 3.3 3.3
713 5.5 7.0 7.0 7.0 5.5
715 10.0 15.0 15.0 15.0 13.5
718 12.0 16.0 18.5 16.0 16.0
721 15.0 20.5 20.5 20.5 19.0
724 18.0 24.5 28.5 24.5 24.5
726 28.0 36.0 43.0 36.0 36.0
730 44.0 60.0 67.0 60.0 60.0
732 58.0 84.0 90.0 84.0 80.0
738 85.0 120.0 130.0 120.0 107.0
752 204.0 240.0 245.0 240.0 215.0
760 330.0 400.0 415.0 400.0 370.0
Stainless Steel Oil Capacity in Fluid Ounces
Double Reduction Models
The variety of mounting possibilities for double
reduction drives makes it impractical to illustrate
positions for these models. In general, the vent filler is
at the uppermost plug position, and the drain plug at
the lowest possible position. The oil level must be at
the approximate centerline of both gearboxes. In non
stainless steel gearboxes the oil will flow between both
gearboxes, so if one gearbox is above the other the
lower gearbox must be 100% full.
Recommended Lubricants
Enclosed Worm Gear Reducers
Ambient
(Room)
Temperature
1.00 SF
Recommended
Oil
(or equivalent)
Viscosity
Range
SUS @ 100°F
Oil Type
ISO
Viscosity
Grade
No. +
-20° to
225°F**
(-29° to
107°C)
Klubersynth*
UH1 6-460
Synthetic
1950/2500 PAG 460
-30° to
225°F
(-34° to
107°C)
Mobil SHC634
Synthetic 1950/2500 PAO 320/460
Worm Gear Lubricants
Available from Boston Gear
Order By Item Code
Type Klubersynth Mobil
SHC634
Size QT. QT. Gallon
Item
Code 65159 51493 51494
Relubricate more frequently if drive
operated in high ambient temperatures or unusually
contaminated atmosphere. High loads and operating
temperatures will also require more frequent lubrication.
*Food Grade Synthetic recommendation is
exclusively for Klubersynth UH1 6-460.
+Other lubricants corresponding to AGMA/ISO numbers
are available from all major oil companies.
**The synthetic lubricant will perform at
temperatures considerably higher than 225°F. However,
the factory should always be consulted prior to operating
at higher temperatures as damage may occur to oil seals
and other components.
Unit
Size
Positions
1 2 3 4 5 & 6
713 3.2 3.2 4.8 3.2 3.2
715 11.2 13.6 17.6 13.6 13.6
718 14.4 17.6 20.8 17.6 17.6
721 17.6 20.8 22.4 20.8 20.8
724 21.0 22.5 25.5 22.5 22.5
726 37.0 37.0 41.5 37.0 37.0
732 81.5 85.0 93.0 85.0 85.0

6Boston Gear 700 Series P-3009-BG Doc. No. 57746
Lubricant Interchange
Lubricants are compounded for use in worm gears.
Some contain non-corrosive, extreme pressure
additives. DO NOT USE lubes that contain sulphur
and/or chlorine which are corrosive to bronze gears.
Extreme pressure lubes, in some cases contain
materials that are toxic. Avoid use of these lubes where
they can result in harmful effects. If in doubt, consult
your lube supplier.
Manufacturer Lubricant
Name
AGMA
Rating
Getty Refining Co.
Getty Refining Co.
Getty Refining Co.
Veedol Asreslube 98
Veedol Asreslube 95
Veedol Asreslube 90
8 EP
7 EP
6 EP
Lubrication Engr. Inc.
Lubrication Engr. Inc.
Almasol 609
Almasol 608
8
7
Mobil Oil Corp.
Mobil Oil Corp.
Mobil Oil Corp.
Mobilgear 634
Mobil Extra Hecla Super
Mobil Cylinder 600W
8 EP
8
7
Shell OIl Co.
Shell OIl Co.
Shell OIl Co.
Shell OIl Co.
Omala 460
Valvala J460
Omala 680
Valvala J680
7 EP
7
8 EP
8
Texaco Inc.
Texaco Inc.
Meropa 680
Meropa 460
8 EP
7 EP
PosiVent®Option
Units supplied with this option are sealed from the
environment.
To ensure that the system operates properly, DO NOT
REMOVE THE VENT PLUG FOR ANY REASON.

Boston Gear 700 Series P-3009-BG Doc. No. 57746 7
Unit Size
Clock
Designation 710 713 715 718 721 724 726 730 732 738 752 760
1 3.00 6.37 9.30 12.85 14.04 16.97 28.50 42.60 56.80 71.60 162.0 255.7
2 3.30 7.16 9.25 15.04 16.81 19.93 32.00 50.00 67.30 79.70 195.2 265.9
3 3.30 5.50 13.50 16.00 19.00 24.50 36.00 60.00 80.00 107.0 215.0 370.0
4 3.55 7.98 12.06 18.00 20.28 24.95 37.70 57.00 77.10 102.0 209.5 321.7
5 3.98 8.18 12.30 18.69 21.45 26.95 40.00 60.40 80.90 106.7 192.0 357.0
6 3.30 7.00 15.00 18.50 20.50 28.50 43.00 67.00 90.00 130.0 245.0 415.0
7 3.98 8.18 12.30 18.69 21.45 26.95 40.00 60.40 80.90 106.7 192.0 357.0
8 3.55 7.96 12.06 18.00 20.28 24.95 37.70 57.00 77.10 102.0 209.5 321.7
9 3.30 5.50 13.50 16.00 19.00 24.50 36.00 60.00 80.00 107.0 215.0 370.0
10 3.31 7.16 9.25 15.04 16.81 19.93 32.00 50.00 67.30 79.70 195.2 265.9
11 3.00 6.37 9.30 12.85 14.04 16.97 28.50 42.60 56.80 71.60 162.0 255.7
12 2.20 5.50 10.00 12.00 15.00 18.00 28.00 44.00 58.00 85.00 204.0 330.0
13 3.30 7.00 15.00 16.00 20.00 24.50 36.00 60.00 84.00 120.0 240.0 400.0
14 3.30 7.00 13.50 16.00 19.00 24.50 36.00 60.00 80.00 120.0 240.0 400.0
Oil Capacity In Ounces
For Single Reduction Cast Iron Units Only: Refer To Lubrication & Installation Instructions
Please note the clock designations (1 through 12) do not correlate with the part number nomenclature.
FLOOR
6
7
8
9
10
11
12
1
2
3
4
5
3
30º
60º
60º
30º 30º
60º
30º
60º
Oil Level
Indicated By
Dotted Lines
14
5426
1
13
*Only the circled numbers indicate the mounting
position used in the part number nomenclature.
This is the #1 clock designation.
Non circled numbers indicate
clock designations.
Lubrication Instructions

8Boston Gear 700 Series P-3009-BG Doc. No. 57746
Parts List – Single Reduction Models, Cast Iron Units
29
14 22
18
15 25
16
13
23
8
5
26
2
6
7
12
9
11
24
10
24
11
9
12
8
23
7
6
60
45
51
45
51
50
17
14 20 28
27
31
19
27
1
27
43
45
44
60
45
51 45
51
49
48
50
30 4
30
3
WG.0130
30
*For Models 710 to 726, these parts are available as complete assemblies. See Part Ordering Information, page 9.
Part
No. Description
1 HOUSING
2* WORM GEAR
3* SINGLE PROJECTING OUTPUT SHAFT
4* DOUBLE PROJECTING OUTPUT SHAFT
5* GEAR SPACER
6* OUTPUT BEARING (CONE) –MODELS 713-760
7 OUTPUT BEARING (CUP) – MODELS 713-760
8 OUTPUT BEARING – MODEL 710 ONLY
9 BEARING CARRIER (OPEN)
10 BEARING CARRIER (CLOSED)
11* OUTPUT OIL SEAL
12* ADJUSTMENT SHIMS
13 INPUT WORM SHAFT
14 INPUT BEARING – MODELS 710-730
15 INPUT BEARING RETAINER
16 INPUT OIL SEAL – MODELS 710-760
17 RETAINING RING
18 ADJUSTMENT SHIMS
19 BORE PLUG – MODELS 710-730
20 INTERNAL BAFFLE – MODELS 713-732
22 INPUT “O” RING
23* OUTPUT “O” RING
24 HEX HEAD CAP SCREW
25 HEX HEAD CAP SCREW
26 VENT PLUG
Part
No. Description
27 PIPE PLUG
28 PROTECTIVE CAP PLUG
29 INPUT KEY
30 OUTPUT KEY
31 NAMEPLATE
32 INPUT BEARING (CUP) MODELS 732-760
33 INPUT BEARING (CONE) – MODELS 732-760
34 GREASE CUPS – MODELS 732-760
35 HEX HEAD CAP SCREW
37 OUTPUT SHAFT KEY – MODELS 730-760
38 RETAINING RING – MODELS 710-738
39 MOTOR SHAFT – MODELS 710-738
40 MOTOR FLANGE – MODELS 710-738
41 OIL SEAL – MODELS 710-738
42 HEX HEAD CAP SCREW
43 HORIZONTAL BASE
44 HEX HEAD CAP SCREW
45 LOCKWASHER
46 2 PIECE FC COUPLING – WITH INSERT
47 RETAINING MOTOR FLANGE
48 RISER BLOCK
49 HEX HEAD CAP SCREW
50 VERTICAL BASE (HIGH OR LOW)
51 HEX HEAD CAP SCREW
Part
No. Description
60 VERTICAL BASE (X & Y ASSEMBLY)
101 FAN
102 SPACER
103 HEX HEAD CAP SCREW
104 FAN GUARD
105 HEX HEAD CAP SCREW
106 WASHER
165 HOLLOW OUTPUT SHAFT (S VERSION
ONLY)
166 HOLLOW OUTPUT SHAFT (H VERSION
ONLY)
167 WORM GEAR
168 OUTPUT BEARING (CONE)
169 OUTPUT BEARING (CUP)
170 OIL SEAL
171 BEARING CARRIER
172 HOLLOW SHAFT MTG. BRACKET
173 HEX HEAD CAP SCREW
174 LOCKWASHER
175 KEY (INTERNAL)
176 KEY (EXTERNAL)
177 “V” TYPE BASE-MODEL (718, 721, 726, 732)
178 SOCKET SETSCREW

Boston Gear 700 Series P-3009-BG Doc. No. 57746 9
Options & Accessories – Single Reduction Models, Cast Iron Units
Hollow Output Models 732-760
Shaft Models
S and SF718-732*
Fan kit for models 732-760
HOLLOW OUTPUT Models QC710-QC738,
Shaft Models RF752-RF760
H, HF, and HQC713-738
15
16
25
22
32
33 34
33
32
34
WG.0133
37
37
4
3
19
WG.0134
105
104
102
103
106
101
16
WG.0132
16
38 18 14 17
17
19
39
35 42
41
40
42
WG.0135
22
35
16
47
46
Part ordering information
1. Be sure to provide complete Boston Gear catalog number from speed reducer nameplate, along with part description and number. For
example, “One output oil seal, Part No. 11, for RF718-30-B5-G”.
2. Output shaft components for Boston Gear models 710 through 726 are available only as complete assemblies that include Parts 2, 3, 5, 6, 11,
12 and 23 for single projecting shafts; and Parts 2, 4, 5, 6, 11, 12 and 23 for double projecting shafts. When ordering, specify “output shaft
assembly” and full Boston Gear catalog number from nameplate.
* * Not available in the 730 or 724 Center distance, See H series.
Models F710-F738

10 Boston Gear 700 Series P-3009-BG Doc. No. 57746
Parts List – Double Reduction Models , Cast Iron Units
29
21
13
23
5
2
6
7
12
9
11
24
10
24
11
9
12
23
7
6
60
45
51
45
51
50
27
27
30 4
30
3
17
14
19
27
1
49 48
31
30
43
45
44
60
45
51 45
51
50
68
66
65
69
27
27
74 75
77
76
78
93
79
80 81
83
27
70
71
82
63
7318
22
64
65
67
72
26
28
WG.0136
*For Models 710 to 730, these parts are available as complete assemblies. See Part Ordering Information, Page 11.
Part
No. Description
1 HOUSING
2* WORM GEAR
3* SINGLE PROJECTING OUTPUT SHAFT
4* DOUBLE PROJECTING OUTPUT SHAFT
5* GEAR SPACER
6* OUTPUT BEARING (CONE)
7 OUTPUT BEARING (CUP)
9 BEARING CARRIER (OPEN)
10 BEARING CARRIER (CLOSED)
11* OUTPUT OIL SEAL
12* ADJUSTMENT SHIMS
13 INTERMEDIATE WORM SHAFT
14 INTERMEDIATE BEARING–
MODELS W713-W730
15 INTER. BEARING RETAINER–
MODELS W732-W760
16 INTER. OIL SEAL – MODELS W732-W760
17 RETAINING RING – MODELS W713-W730
18 ADJUSTMENT SHIMS
19 BORE PLUG – MODELS W713-W730
21 INTERMEDIATE BEARING
22 INTERMEDIATE “O” RING
23* OUTPUT “O” RING
24 HEX HEAD CAP SCREW
25 HEX HEAD CAP SCREW
26 VENT PLUG – 2 PIECE
27 PIPE PLUG
28 PROTECTIVE CAP PLUG
29 INTERMEDIATE KEY
30 OUTPUT KEY
Part
No. Description
31 NAMEPLATE
32 INTER. BEARING (CUP) –MODELS 732-W760
33 INTER. BEARING (CONE) – MODELS 732-
W760
34 GREASE CUPS – MODELS W732-W760
35 HEX HEAD CAP SCREW
37 OUTPUT SHAFT KEY – MODELS W730-W760
43 HORIZONTAL BASE
44 HEX HEAD CAP SCREW
45 LOCKWASHER
48 RISER BLOCK
49 HEX HEAD CAP SCREW
50 VERTICAL BASE (HIGH OR LOW)
51 HEX HEAD CAP SCREW
60 VERTICAL BASE (ASSEMBLY X & Y)
63 ATTACHMENT HOUSING
64 INPUT WORM SHAFT
65 INPUT BEARING
66 ADJUSTMENT SHIMS
67 RETAINING RING
68 “O” RING
69 BEARING RETAINER
70 OIL SEAL
71 HEX HEAD CAP SCREW
72 BORE PLUG – MODELS W713-W738
73 INPUT WORM SHAFT KEY
74 GEAR SPACER
75 ADJUSTMENT SHIMS
76 HEX HEAD CAP SCREW
77 INTERMEDIATE WORM GEAR
Part
No. Description
78 WASHER
79 LOCKWASHER
80 HEX HEAD CAP SCREW
81 ATTACHMENT COVER GASKET
82 ATTACHMENT COVER
83 HEX HEAD CAP SCREW
84 INPUT BEARING (CONE) – MODEL W760
ONLY
85 INPUT BEARING (CUP) – MODEL W760 ONLY
86 TWO PIECE FC COUPLING WITH INSERT
87 MOTOR FLANGE
88 HEX HEAD CAP SCREW
89 MOTOR FLANGE
90 INPUT WORM SHAFT
91 EXTERNAL RETAINING RING
92 OIL SEAL – MODELS FW713-FW738
93 WASHER
165 HOLLOW OUTPUT SHAFT (S VERSION ONLY)
166 HOLLOW OUTPUT SHAFT (H VERSION ONLY)
167 WORM GEAR
168 OUTPUT BEARING (CONE)
169 OUTPUT BEARING (CUP)
170 OIL SEAL
171 BEARING CARRIER
172 HOLLOW SHAFT MTG. BRACKET
173 HEX HEAD CAP SCREW
174 LOCKWASHER
175 KEY (INTERNAL)
176 KEY (EXTERNAL)
177 “V” TYPE BASE MODEL (718, 721, 726, 732)
178 SOCKET SETSCREWS

Boston Gear 700 Series P-3009-BG Doc. No. 57746 11
Options & Accessories – Double Reduction Models, Cast Iron Units
Part ordering information
1. Be sure to provide complete Boston Gear catalog number from speed reducer nameplate, along with part description and number. For
example, “One output oil seal, Part No. 11, for W713-150-G”.
2. Output shaft components for Boston Gear models 710 through 726 are available only as complete assemblies that include Parts 2, 3, 5, 6, 11,
12 and 23 for single projecting shafts; and Parts 2, 4, 5, 6, 11, 12 and 23 for double projecting shafts. When ordering, specify “output shaft
assembly” and full Boston Gear catalog number from nameplate.
* Not available in 730 center distance, see H series.
Hollow Output Models W732-W760
Shaft Models Parts added to W732-W760
SW, SFW, and SRFW718-732*
Hollow Output Models FW713-FW752
Shaft Models Parts added to W713-W752.
HW, HFW, and HQCW713-738
Models QCW713-QCW760
Parts added to
W713-W726 or
W732-W760.
These parts
available in
kit form.
15
25
22
32
33
34
71 69
68
85
70
84
84
85
33
32
W760
ONLY
W760
ONLY
34
37
37
4
3
WG.0139
16
19
70
88
35
87
68
WG.0138
86
88
35
72
90
65
66
91
67
67
89
92
WG.0140

12 Boston Gear 700 Series P-3009-BG Doc. No. 57746
Output Shaft Disassembly
1. Remove vented filler (Item 26), and the most
convenient pipe plug (Item 27) and completely
drain oil.
2. Remove bearing carrier screws (Item 24) from
projecting shaft bearing carrier (Item 9). Remove
carrier by CAREFULLY sliding it over the
projecting shaft diameter. Carrier removal is
improved by rotating it 30 to 45 degrees and
prying on the exposed edges.
3. Output shaft assembly (Items 2, 3, 5 & 6) can
now be removed from the unit. Exercise care
not to nick or scratch worm gear or shaft
diameters.
4. Visually examine the output shaft assembly.
Check tapered roller bearings (Item 6) for
signs of pitting or metallic contamination or
discoloration. Rollers should have continuously
smooth action and should not bind or exhibit
“flat-spots”.
5. Note that replacement parts for output gear
(Item 2) will include an output shaft assembly
(Items 3 OR 4) for sizes F710 through F726.
Also included are items 5, 6, 11, 12 and 23.
Input Shaft Disassembly
Models F710 through F730
1. With a screwdriver or suitable tool, pierce
the bore plug (Item 19) and remove from the
housing bore.
Models F732 and F738 only
2. Remove fan guard (Item 104). Remove fan
retaining screw (Item 103), fan (Item 101) and
spacer. With a screw-driver or suitable tool,
pierce fan end oil seal or end cap (item 16 or
19) and remove from the housing bore.
3. Remove the outboard retaining ring (Item 17)
from the housing bore. Remove the metal shims
(Item 18), located between the retaining ring and
the ball bearing (Item 14).
4. Remove four (4) screws (Item 42) from the motor
flange (Item 40) and remove the flange from the
housing.
5. Remove the input worm assembly (Items 14, 38
and 39) through the bore opposite the flange side.
Remove the oil seal (Item 41) from the housing.
6. Check the condition of the ball bearing (Item 14).
The bearing should roll smoothly and not bind. If the
bearing needs replacement, remove the snap ring
(Item 38) and press the shaft through the bearing.
Install new bearing onto the shaft and
re-assemble the snap ring. If the bearing is not
pre-packed with grease, pack at least 50% full with
Mobilux EP #2 All Purpose Grease or
equivalent.
Input Shaft Reassembly
Models F710 through F738
1. Insert input worm assembly in the housing. Seat the
ball bearing against the inner retaining ring (Item 17).
2. Install the metal shims (Item 18) and assemble
outboard snap ring (Item 17).
3. Clean the housing bore(s) in the area where oil seals
will be installed.
4. Coat the oil seals as follows:
A. Rubber Clad Oil Seals - Apply ALL-PURPOSE
grease (NLGI #2 consistency) to the seal lip area.
5. Insert the new oil seal (Item 41) over the shaft until
it contacts the housing. CARE MUST BE TAKEN
NOT TO DAMAGE THE OIL SEAL LIP. For best
performance, cover the shaft with a seal leader or
greased paper to prevent seal lip damage.
6. With a small hammer, tap around the face of the oil
seal casing - near the outside diameter. Locate the
seal as shown in Figure 2 Page 20. Use a
suitable driving tool that contacts the full seal face.
Once the seal is fully seated,verify the seal is not
cocked in the bore. For best seal performance they
should be installed perpendicular within .010” of the
machined surface.
F700 Series
Disassembly and Reassembly Procedures
(For Item Identification, Refer To Exploded View)

Boston Gear 700 Series P-3009-BG Doc. No. 57746 13
Model F710 through F730
7. Install a new bore plug (Item 19). Using a small
hammer, lightly tap around the plug face near the
outside diameter. CAUTION should be exercised
not to distort or cock the bore plug.
Model F732 and F738
8. Install new oil seal on the fan end (Item 16). With a
small hammer, tap around the face of the oil seal
casing - near the outside diameter. Use a suitable
tool to assure squareness of the seal to the bore.
Drive the seal flush to 1/16th inch
projection. Reinstall fan spacer, fan, washer,
lockwasher, and bolt. Verify the seal is not cocked
in the bore. Tighten the bolt per the chart in Figure
5, Page 21. Reinstall the fan guard and tighten the
screws per chart in Figure 5.
Worm Gear Replacement
Model F710 through F726
1. Replace the entire output assembly.
Model F730 through F760
2. Place the output gear assembly into a pressing
fixture and remove the worm gear from the shaft.
3. With the gear key assembled in the shaft key,
press the new gear onto the shaft to the dimension
shown in Figure 1, Page 20.
4. Install the shaft spacer (Item 5) and grease cups
(Item 34).
5. Press the bearing cones (Item 6) onto the shaft
making sure that the assembly is tight (no space
between items).
6. Remeasure from the end of the shaft to the gear
face as shown in Figure 1, Page 20. Readjust, if
necessary, by pressing on the bearing cone until
desired dimension is achieved.
7. Where grease cups are used, pack with Mobilux EP
#2 All Purpose Grease or equivalent.
Output Shaft Reassembly into Housing
1. Remove the existing oil seal (Item 11) from the
bearing carrier (Item 9).
2. Coat the gear teeth with blue or red Dykme
mixture or similar coating and install the output
assembly into the housing.
3. Slide the bearing carrier over the projecting shaft
and bolt the carrier to the housing, making sure
the metal shims (Item 12) are between the carrier
and the housing. Rotate the input shaft to
properly seat the tapered bearings.
4. Shim adjustment must be made at this time. If
the output shaft is excessively loose, measure the
endplay of the output shaft and remove shims
evenly from BOTH carriers until the endplay is
within the limits shown in Figure 3, Page 21.
If the carrier does NOT meet the housing face,
measure the gap and add shims evenly to BOTH
carrier locations until the endplay is within the
limits specified.
5. ASSEMBLE THE MOTOR TO THE UNIT. Check
the worm gear centrality. Apply a slight load on
the output shaft then rotate the input shaft for
one to two minutes. Remove the bearing carrier
and remove the gear shaft assembly. Check the
gear teeth for correct contact pattern as shown
in Figure 6, Page 22.
6. If adjustment is required, all adjustments MUST
be made to the carrier which is located on the
side OPPOSITE the GEAR HUB. All adjustment
for centrality must be made from the TOTAL shim
pack which has already been determined.
Example: If a shim is REMOVED from the
centralized side, it must be ADDED to
the opposite side.
7. When a good contact pattern has been
established, assemble carrier(s) to the unit.
Replace all O-rings (Item 23) where required.
(Install all shims on the carriers BEFORE installing
O-rings.)
8. Install a new oil seal (Item 11) into the carrier
bore. Use procedures as described above. Install
the carrier over the projecting shaft (recommend
placing masking tape over the sharp edges of the
shaft keyseat to prevent cutting the oil seal lip).
9. Tighten all screws as shown in Figure 5, Page
21.
10. Fill the unit to the proper oil level with the
recommended lubricant.
11. Install the vent plug (Item 26) and the drain pipe
plug (Item 27).

14 Boston Gear 700 Series P-3009-BG Doc. No. 57746
Output Shaft Disassembly
1. Remove vented filler (Item 26) and the most
convenient pipe plug (Item 27) and completely
drain oil.
2. Remove bearing carrier screws (Item 24) from
projecting shaft bearing carrier (Item 9). Remove
carrier by CAREFULLY sliding it over the
projecting shaft diameter.
3. Output shaft assembly (Items 2, 3, 5 & 6) can
now be removed from the unit. Exercise care
not to nick or scratch worm gear or shaft
diameters.
4. Visually examine the output shaft assembly.
Check tapered roller bearings (Item 6) for signs
of metallic contamination or discoloration.
Rollers should have continuously smooth action
and should not bind or exhibit “flat-spots”.
5. Note that replacement parts for output gear
(Item 2) will include an output shaft (Items 3 OR
4) for sizes RF/710 through RF/726.
Input Shaft Disassembly
Model RF/710 through RF/730
1. With a screwdriver or suitable tool, pierce
the bore plug (Item 19) and remove from the
housing.
2. Remove the snap ring (Item 17) from the
housing. Remove the retainer at the projecting
shaft (Item 15) and the shims (Item 18).
3. With a soft mallet, tap lightly on the projecting
shaft, removing the shaft assembly from the
bore plug end.
4. Check the condition of the ball bearings (Item
14). The bearing should roll smoothly and
not bind. If the bearing needs replacement,
press the shaft through the bearing. Install
new bearings on the shaft. Install bearings so
that the shields face inward. If the bearing is
not prepacked with grease, pack at least 50%
full with Mobilux EP #2 All Purpose Grease or
equivalent.
End Cap Instructions
Model RF/732 through RF/760
5. Remove the fan guard (Item 104). Remove the
fan retaining screw (Item 103), fan (Item 101), and
spacer. Remove the retainer(s) (Item 15) at both
ends, if applicable or remove the motor flange (Item
47) and shims (Item 18) and O-ring (Item 22).
6. With a soft mallet, tap lightly on the projecting shaft,
removing the bearing cup and input shaft through
the fan end.
7. Remove the bearing cup from the projecting shaft
end.
8. Check the conditions of the bearing cones and
cups (Items 32 and 33). The rollers should not
exhibit pitting. The cage should show no wear or
distortion. The bearings, when supported in the
cups, should run smoothly with no binding.
9. If the bearings need replacement, press the shaft
through the bearing. Hand-pack the new cones
with grease and install onto the shafts.
Input Shaft Reassembly
Model RF/710 through RF/730
1. Install the retaining ring (Item 17) in the outboard
housing groove. Install the input shaft assembly
through the projecting shaft end of the housing.
Tap lightly to seat the bearing against the snap ring
retainer.
2. Remove the old oil seal (Item 16) from the bearing
retainer (Item 15). Using a small hammer, install a
new oil seal by tapping around the face of the seal
casing - near the outside diameter. The seal should
be flush to 1/16th inch projection above the retainer
surface. Verify the seal is not cocked in the bore.
3. Install the bearing cup (Item 32) and shims (Item
18), the bearing retainer (Item 15) and the O-ring
(Item 22). It is recommended to protect the oil seal
lip by using masking tape on the keyseat edges.
700 and RF700 and QC700 Series
Disassembly and Reassembly Procedures
(For Item Identification, Refer To Exploded View)

Boston Gear 700 Series P-3009-BG Doc. No. 57746 15
Model RF/732 through RF/760
4. Install a new oil seal in the far retainer (Item 16).
With a small hammer, tap around the face of the
oil seal casing - near the outside diameter. Use a
suitable tool to assure squareness of the seal to the
bore. Drive the seal flush to 1/16th inch
projection. Verify the seal is not cocked in the bore.
5. Repack the roller bearings (Items 32 and 33) or
replace if required.
6. Reinsert the input shaft assembly, assuring that the
far bearing cup (Item 32) is in place. Lightly tap the
end of the projecting shaft to seat the bearing.
7. Insert the front bearing cup (Item 32) and the shim
pack. Replace the front oil seal in the retainer as per
step #4 above.
8. Reinstall the front retainer using the O-ring. Tighten
all bolts per table Figure 5, Page 21.
9. Rotate the shaft several times to seat the bearings
and check for shaft endplay per Figure 4, Page 21.
Adjust if required.
10. Replace fan and fan guard. Tighten bolts per Figure
5, Page 21.
Worm Gear Replacement
Model RF/710 through RF/726
1. Replace the entire output assembly.
Model RF/730 through RF/760
2. Place the output gear assembly into a pressing
fixture and remove the worm gear from the shaft.
3. With the gear key assembled in the shaft key seat,
press the new gear onto the shaft to the dimension
shown in Figure 1, Page 20.
4. Install the shaft spacer (Item 5) and grease cups
(Item 34).
5. Press the bearing cones (Item 6) onto the shaft
making sure that the assembly is tight (no space
between items).
6. Remeasure from the end of the shaft to the gear
face as shown in Figure 1, Page 20. Readjust, if
necessary, by pressing on the bearing cone until
desired dimension is achieved.
7. Where grease cups are used, pack with Mobilux EP
#2 All Purpose Grease or equivalent.
Output Shaft Reassembly into Housing
1. Remove the existing oil seal (Item 11) from the
bearing carrier (Item 9).
2. Coat the gear teeth with blue or red Dykme
mixture or similar coating and install the output
assembly into the housing.
3. Slide the bearing carrier over the projecting
shaft and bolt the carrier to the housing, making
sure the metal shims (Item 12) are between the
carrier and the housing. Rotate the input shaft
to properly seat the tapered bearings.
4. Shim adjustment must be made at this time. If
the output shaft is excessively loose, measure
the endplay of the output shaft and remove
shims evenly from BOTH carriers until the
endplay is within the limits shown in Figure 4.
If the carrier does NOT meet the housing face,
measure the gap and add shims evenly to
BOTH carrier locations until the endplay is within
the limits specified.
5. Check the worm gear centrality. Apply a slight
load on the output shaft and rotate the input
shaft for one to two minutes. Remove the
bearing carrier and remove the gear shaft
assembly. Check the gear teeth for correct
contact pattern as shown in Figure 6, Page 22.
6. If adjustment is required, all adjustments MUST
be made to the carrier which is located on the
side OPPOSITE the GEAR HUB. All adjustment
for centrality must be made from the TOTAL
shim pack which has already been determined.
Example: If a shim is REMOVED from the
centralized side, it must be ADDED to
the opposite side.
7. When a good contact pattern has been
established, assemble carrier(s) to the unit.
Replace all O-rings (Item 23) where required.
(Install all shims on the carriers BEFORE
installing O-rings).
8. Install a new oil seal (Item 11) into the carrier

16 Boston Gear 700 Series P-3009-BG Doc. No. 57746
bore. Use procedures as described above.
Press the seal flush to 1/16th inch projecting.
Install the carrier over the projecting shaft
(recommend placing masking tape over the
sharp edges of the shaft keyseat to prevent
cutting the oil seal lip). Verify the seal is not
cocked in the bore.
9. Tighten all screws as shown in Figure 5, Page
21.
10. Fill the unit to the proper oil level with the
recommended lubricant.
11. Install the vent plug (Item 26) and the drain pipe
plug (Item 27).

Boston Gear 700 Series P-3009-BG Doc. No. 57746 17
FW713 - FW752 Series
Output Shaft Disassembly
1. Remove vented filler (Item 26), and the most
convenient pipe plug (Item 27) and completely drain
oil.
2. Remove bearing carrier screws (Item 24) from both
bearing carriers (Items 9 & 10). Remove both
carriers.
Note: Carefully slide open carrier (Item 9) over
projecting shaft diameter.
3. Output shaft assembly (Items 2, 3, 5 & 6) can now
be removed from unit. Exercise care not to nick or
scratch worm gear or shaft diameters.
4. Output shaft assembly can now be visually
examined. Check tapered roller bearings (Item 6) for
signs of any metallic contamination or
discoloration. Rollers should have continuously
smooth action and should not bind or exhibit
“flat-spots”.
Intermediate Worm Shaft Disassembly
Models FW713 - FW730
1. With a screwdriver or other similar tool, pierce input
bore plug (Item 19) and remove from
housing bore.
Models FW732 - FW752
Remove bearing retainer screws (Item 25) and remove
bearing retainer (Item 15).
Models FW713 - FW752
2. Remove outboard retaining ring (Item 17) from
housing bore.
Models FW713 - FW738
3. Remove four (4) screws (Item 83) from attachment
cover (Item 82) and remove from housing.
4. Remove screw (Item 80), lock washer (Item 79) and
washer (Item 78).
5. Remove intermediate worm assembly (Item 13)
through bore opposite attachment housing.
Models FW713 - FW730
6. Check condition of ball bearings (Items 14 & 21).
Bearings should roll smoothly and not bind. If
bearings need replacement, press shaft through
bearings. Install new bearings onto shaft. If not
already packed with grease, bearings should be
packed at least 50% full with Mobilux EP #2 All
Purpose Grease or equivalent.
Models FW732 - FW752
Check tapered roller bearings (Items 32 & 33) for
signs of any metallic contamination or discoloration.
Rollers should have continuously smooth action
and should not bind or exhibit “flat-spots”. Repack
bearings with Mobilux EP #2 All Purpose or
equivalent.
Intermediate Worm Gear
Now that intermediate shaft has been removed,
intermediate gear (Item 77) may be removed from
attachment housing. Shims (Item 75) and gear spacer
(Item 74) should be set aside for reassembly.
Note: Do not attempt to remove intermediate worm
gear (Item 77) prior to removal of intermediate shaft
as gear teeth will be damaged from being pried out
from under the engaged worm threads.
Input Shaft Disassembly
1. With a screwdriver or other similar tool, pierce
input bore plug (Item 72) and remove from
housing bore.
2. Remove outboard retaining ring (Item 67) from
housing bore. Remove metal shims (Item 66)
located between snap ring and ball bearing
(Item 65).
3. Remove four (4) screws (Item 88) from motor
flange (Item 89) and remove flange from housing.
4. Remove input worm assembly (Item 90) through
bore opposite flange side. Remove oil seal (Item
92) from housing bore. Inboard retaining ring (Item
67) will remain in housing.
W700, RFW 700 and QCW700 Series
Disassembly and Reassembly Procedures
(For item identification, refer to exploded view)

18 Boston Gear 700 Series P-3009-BG Doc. No. 57746
5. Check condition of ball bearing (Item 65).
Bearing should roll smoothly and not bind. If
bearings need replacement, remove snap ring
(Item 91) and press shaft through bearing.
Install new bearing onto shaft and reassemble snap
ring (Item 91). If not already packed with grease,
bearing should be packed at least 50% full with
Mobilux EP #2 All Purpose Grease or equivalent.
Input Shaft Reassembly
1. Insert input worm shaft assembly (Item 90) into
housing with retaining ring (Item 67) used to
seat ball bearing.
2. Install metal shims (Item 66) and assemble
outboard snap ring (Item 67).
3. Clean housing bore(s) in area where oil seal is to
be inserted.
4. Oil Seal Assembly:
A. Rubber Clad Oil Seal
Apply All Purpose Grease (NLGI #2
consistency) to seal lip area.
B. Steel Clad Oil seal
Lightly apply All Purpose Grease to seal lip
area.
5. Insert new oil seal (Item 92) over the shaft (care
must be taken not to damage oil seal lip) until it
contacts the housing.
6. With small hammer, tap around the face of
seal casing near the outside diameter. Oil seal
location as follows:
Flange end oil seal - Refer to Figure (2) Page 20
(use suitable driving tool to recess seal).
7. Install new bore plug (Item 72). If rubber
clad O.D. no sealant is required. Using small
hammer, lightly tap around plug face near the
outside diameter. Caution should be exercised
not to distort or cock plug during installation.
8. Assemble motor flange (Item 89).
Intermediate Worm Reassembly
1. Insert intermediate worm assembly (Item 13)
through bore opposite attachment housing.
Note: Spacer (Item 74) and shims (Item 75) should be
put on shaft and worm gear (Item 77) held in
mesh with input worm (Item 90) while sliding
intermediate worm assembly into position.
2. Assemble attachment cover (Item 82).
Models FW713 - FW730
3. Install new bore plug (Item 19). Using small
hammer, lightly tap around plug face near the
outside diameter. Caution should be exercised not
to distort or
cock plug during installation.
Models FW732 - FW752
Assemble intermediate bearing retainer (Item 15).
Worm Gear Replacement
Models FW713 - FW726
1. Replace entire output assembly.
Models FW730 - FW752
1. Place output gear assembly (Item 2) into a pressing
fixture and remove worm gear from shaft.
2. With gear key assembled in shaft keyseat, press
new gear onto shaft to dimension shown in Figure
1, Page 20.
3. Install shaft spacer (Item 5) and grease cups (Item
34) when applicable.
4. Press bearing cones (Item 6) onto shaft making sure
the assembly is tight.
5. Remeasure from end of shaft to worm gear face as
shown in Figure 1, Page 20. If adjustment is
necessary, press bearing cone (Item 6) until
required dimension is achieved.
6. Where grease cups are used, pack with Mobilus EP
#2 All Purpose Grease or equivalent.

Boston Gear 700 Series P-3009-BG Doc. No. 57746 19
Output Shaft Reassembly into Housing
1. Remove existing oil seal (Item 11) from bearing
carrier (Item 9).
2. Coat gear teeth (Item 3) with red-lead mixture or
similar coating and install output gear assembly into
housing.
3. Slide bearing carrier (Item 9) over projecting shaft
(Item 4) diameter and bolt carrier to housing. Make
sure metal shims (Item 12) are between
carrier and housing face. Rotate input shaft to
properly seat tapered roller bearings.
4. Adjustments of shims (Item 12) must be made
at this time. If output shaft is excessively loose,
measure endplay of output shaft and remove shims
(Item 12) evenly from both carriers (Items 9 and 10)
until endplay is within limits specified on Figures 3 or
4, Page 21.
If bearing carrier (Item 9) does not meet housing
face, measure gap and add shims (Item 12) evenly
to each side (Items 9 and 10).
5. Assemble motor to unit. Check worm gear
centrality. Apply slight load to output shaft and
rotate input shaft for 1 or 2 minutes. Remove output
bearing carrier (Item 9) and remove output gear
assembly. Check gear teeth for contact pattern.
Optimum bearing pattern is shown in Figure 3,
Page 22.
If gear requires adjustment for centrality, all
adjustments must be made from side opposite gear
hub.
Note: All adjustment for gear centrality to be made
from the already established total shim pack
(Ref. - Step 4). For example - If a shim is
removed from centralized side, it must be
added to the opposite side.
6. When good contact pattern or gear teeth is
established, assemble carriers(s) to unit. Install
new oil seal (Item 12) into bearing carrier bore.
Seal assembly same as shown in “Input Shaft
Reassembly” - Steps 4, 5 and 6. (Recommend
masking tape over sharp keyseat edges so seal
lip is not cut or damaged.) Oil seal to be flush with
carrier face. Verify the seal is not cocked in the
bore.
7. Fill unit to proper level with recommended gear
lubrication. (Ref. Page 7.)
8. Install vent (Item 26) and pipe plug (Item 27).
Important: All screw tightening torques listed in
Figure 5, Page 21.
Note: For RFW and W700 Series Ref. to Single
Reduction Instructions for 700/RF Series
Input Disassembly and reassembly Page 14

20 Boston Gear 700 Series P-3009-BG Doc. No. 57746
B
A
Figure No. 1
BOSTON
C
Figure No. 2
Note: “C” Dimensions shown are original oil seal
locations. When seal is replaced add or
subtract 1/16th of an inch to dimension
shown. This will allow seal to wear on a
new surface for extended life.
Unit “A” ± 1/64 “B” Ref. Only
730 6.310 6-3/4
732 7.469 7-1/16
738 7.25 7-3/4
752 8.44 9-1/16
760 9.28 10
Unit Size “C” Dimension
F710/FW713 5/16
FW718
F713/FW721 3/8
FW726
F715 3/8
F718/FW732 3/8
F721/FW738 3/8
F724 3/8
F726 3/8
F730 3/8
F732 5/8
F738 5/8