Materials of Construction Aluminum (Sizes 11 - 31) Cast Iron (Sizes 35 - 100)
Design Features Viking offers eleven sizes of in-line, double reduction gear reducers to reduce standard driver speeds to match pump (or other driven equipment) requirements.  With the in-line design, the input (high speed) shaft is on the same centerline as the output (slow speed) shaft.  All sizes are available with solid input shaft, and sizes 11 through 60 are available with NEMA C-flange motor mount or IEC flange motor mount on the input side.
Performance Ratios 2.63:1 to 38.0:1 2.63:1 to 38.0:1 Output Speed 551 - 38 (50Hz, 4 pole) 665 - 46 (60Hz, 4 pole) Power 0.37 - 261 kW 0.5 - 350 HP

60 Hz Motor Speeds
Size	Number of Ratios	Ratio Range	1750 RPM		1150 RPM
			HP Range	Output RPM Range	HP Range	Output RPM Range
11	15	2.77:1 to 22.9:1	3.4 - 0.96	632 - 76	2.5 - 0.70	415 - 50
21	15	2.72:1 to 21.9:1	7.7 - 2.4	643 - 80	5.7 - 1.5	423 - 52
31	15	2-88:1 to 22.6:1	11.6 - 3.4	608 - 77	8.4 - 2.2	399 - 57
35	14	2.69:1 to 19.0:1	16.2 - 5.2	651 - 92	11.4 - 3.2	427 - 60
41	18	2.69:1 to 31.4:1	23.5 - 4.1	651 - 56	14.8 - 2.6	427 - 37
51	18	2.63:1 to 33.0:1	39.8 - 6.2	665 - 53	25.0 - 3.9	437 - 35
61	20	2.82:1 to 38.0:1	50.8 - 9.2	621 - 46	32.8 - 5.8	408 - 30
70	16	4.57:1 to 34.7:1	95.3 - 15.7	383 - 50	63.5 - 9.8	252 - 33
80	17	5.64:1 to 31.3:1	143 - 30.5	310 - 56	101 - 19.2	204 - 37
90	19	5.17:1 to 35.1:1	217 - 39.8	338 - 50	153 - 25.0	222 - 33
100	17	4.92:1 to 29.6:1	359 - 74.0	356 - 59	259 - 50.0	234 - 39
50 Hz Motor Speeds
Size	Number of Ratios	Ratio Range	1450 RPM		950 RPM
			kW Range	Output RPM Range	kW Range	Output RPM Range
11	15	2.77:1 to 22.9:1	2.2 - 0.62	523 - 63	1.4 - 0.39	343 - 41
21	15	2.72:1 to 21.9:1	5.0 - 1.4	533 - 66	3.2 - 0.82	349 - 43
31	15	2-88:1 to 22.6:1	7.4 - 2.1	503 - 64	4.7 - 1.2	330 - 47
35	14	2.69:1 to 19.0:1	10.3 - 3.1	539 - 76	6.4 - 1.8	353 - 50
41	18	2.69:1 to 31.4:1	14.2 - 2.5	539 - 46	8.2 - 1.4	353 - 30
51	18	2.63:1 to 33.0:1	24.1 - 3.8	551 - 44	14.0 - 2.2	361 - 29
61	20	2.82:1 to 38.0:1	31.2 - 5.6	514 - 38	18.3 - 3.2	337 - 25
70	16	4.57:1 to 34.7:1	59.2 - 9.5	317 - 42	35.5 - 5.5	208 - 27
80	17	5.64:1 to 31.3:1	91.0 - 18.5	257 - 46	56.9 - 10.7	168 - 30
90	19	5.17:1 to 35.1:1	137 - 24.1	280 - 41	85.8 - 14.0	184 - 27
100	17	4.92:1 to 29.6:1	230 - 46.3	144 - 27.9	144 - 27.9	193 - 32

Model	Drawing*	Service Manual	Brochure	Catalog
All 11 Ratios	Inch	English Chinese Deutsch Español Français Italiano Português Russian	English Chinese Deutsch Español Français Italiano Português Russian	English
All 21 Ratios	Inch
All 31 Ratios	Inch
All 35 Ratios	Inch
All 41 Ratios	Inch
All 51 Ratios	Inch
All 61 Ratios	Inch
All 70 Ratios	Inch
All 80 Ratios	Inch
All 90 Ratios	Inch
All 100 Ratios	Inch

*Drawings are for solid input shaft models only.  C-flange motor mount drawings can be found in the catalog.