Specification Sheet
Dimensional Differences HD2A to HD70A & HD3A to HD120A
HD2A
25
2432
12
2" NPT PORT
SUCTION
5
148
1
38
3
54
3
Ø18
2
5
16 SQUARE KEY
1 LONG
22
1
122
1
84
5
8
2" NPT PORT
DISCHARGE
7
(4) Ø16
MTG. HOLES
13
116
1
42
1
82
3
94
1
32
7
1
88
Excellence at work. Excellence in life.
HD70A
3
248
3
134
3" NPT PORT
SUCTION
*
*
127
8
*
2
*
1
22
1
2 SQUARE KEY
1 LONG
22
1
32
*
*
17
8
*
1
134
*
1
64
*
1
24
*
1
82
5
8
*
2" NPT PORT
DISCHARGE
*
(4) 13
32 TYP.
MTG. HOLES
1
12
*
107
8
1
24
1
42
5
88
1
32
7
8
3
84
Page 2 of 6
Pump
Footprint
Discharge Port
Suction Port
Drive Shaft
Mounting
Holes
Section Descripton
2A
70A
Remarks
Mounting Hole Location
Same
Same
Existing mounting holdes can be re-used and adjustments can be made to piping
and motor locations.
Mounting Hole Size
(4) 7/16”
(4) 13/32”
Same fasteners can be re-used.
Shaft Diameter
12”
1-7/8”
Move motor closer to pump and/or increase couploing length to take up 1-1/8”
difference.
Square Key Size
5/16 x 2-1/2 Lg. 1/2 x 2-1/2 Lg.
Key for new coupling bore is also larger.
Center of Mounting Hole Pattern to End of Shaft
12”
10-7/8”
Move motor closer to pump and/or increase coupling length o take up 1-1/8”
difference.
Shaft offset from Center of Pump
2”
2-1/2”
Reposition the motor 1/2”.
Shaft Center to Bottom of Pump
8-1/4”
8-1/2”
Shim motor 1/4 Note: Shimming pump 1/4” & motor 1/2” will maintain discharge
piping height.
Shaft End to Body of Pump
3-1/8”
3-1/2”
70A has more room to fit larger coupling.
Size
3” NPT
3” NPT
Center Port to Center of Mounting Patter
1-3/4”
2”
Center Port to End of Shaft
13-3/4”
12-7/8”
Bottom of Pump to Port Surface
12-5/8”
13-1/4”
Size 70A is .625 higher, so cut back piping by that amount.
Size
3” NPT
2” NPT
Install reducer bushing and shorten pipe or re-size pipe.
Center of Port to Bottom of Pump
2-1/2”
2-1/4”
Shim pump 1/4” Note: Shimming pump 1/4” and motor 1/2” will maintain
discharge piping height.
Center of Port to Drive Shaft
5-3/4”
6-1/4”
Reference Dimensions
Width
12”
13-3/4”
Height
12-5/8”
13-1/4”
Length Including Shaft
24-25/32”
24-7/16”
Relocate port piping 1/4” away from motor end of pump.
Page 3 of 6
HD3A
12
3" NPT PORT
SUCTION
25
2432
3
134
1
38
3
54
3
Ø18
2
5
16 SQUARE KEY
1 LONG
22
5
128
1
84
5
8
3" NPT PORT
DISCHARGE
7
(4) Ø16
MTG. HOLES
3
18
1
42
1
816
3
94
1
32
7
1
88
Page 4 of 6
HD120A
7
2416
3
134
3
128
4" NPT PORT
SUCTION
1
22
1
2 SQUARE KEY
1 LONG
22
1
32
Ø17
8
1
134
1
64
1
82
5
8
3" NPT PORT
DISCHARGE
(4) 13
32 TYP.
MTG. HOLES
1
12
1
42
13
816
5
88
1
32
7
8
Page 5 of 6
Pump
Footprint
Discharge Port
Suction Port
Drive Shaft
Mounting
Holes
Section Descripton
3A
120A
Remarks
Mounting Hole Location
Same
Same
When replacing 120A with 3A existing mounting holes can be reused and
adjustments made to piping and motor locations.
Mounting Hole Size
(4) 7/16"
(4) 13/32"
Same fasteners can be re-used
Shaft Diameter
1-3/8"
1-7/8"
1/2" larger coupling bore required
Square Key Size
5/16 x 2-1/2 Lg. 1/2 x 2-1/2 Lg.
Key for new coupling bore is also larger.
Center of Mounting Hole Pattern to End of Shaft
12"
10-7/8"
Move motor closer to pump and/or increase coupling length to take up 1-1/8"
difference.
Shaft Offset (from Center of Pump)
2"
2-1/2"
Reposition motor 1/2"
Shaft Center to Bottom of Pump
8-1/4"
8-1/2"
Shim motor 1/4" (NOTE: Shimming pump 1/4" and shimming motor 1/2" will
maintain discharge piping height).
Shaft End to Body of Pump
3-1/8"
3-15/32"
70A has more room to fit larger coupling.
Size
3" NPT
4" NPT
Center of Port to Center of Mounting Pattern
1-3/4"
1-1/2"
Center of Port to End of Shaft
13-3/4"
12-3/8"
Bottom of Pump to Port Surface
12-5/8"
13-1/4"
Size
3" NPT
3" NPT
Center of Port to Bottom of Pump
2-1/2"
2-1/4"
Shim pump 1/4" (NOTE: Shimming pump 1/4" and shimming motor 1/2" will
maintain discharge piping height).
Center of Port to Drive Shaft
5-3/4"
6-1/4"
Reference dimensions
Width
12"
13-3/4"
Height
12-5/8"
13-1/4"
Length (including shaft)
24-25/32"
24-7/16"
Tuthill Pump Group
USA • United Kingdom • China
www.tuthillpump.com
Relocate port piping 1/4" towards motor end of pump.
120A is .625 higher, so cut back piping by that amount.
Excellence at work. Excellence in life.