Model Numbers: SYF-4M=4.75rpm (254: 1 ratio, 1/8 HP 48V DC motor) (When input speed is 1200 rpm) SYF-4=6.8rpm (254: 1 ratio, without motors) (Accepts NEMA 48-C face motors with 1/2 shafts 1-9/16 long) (When input speed is 1740 rpm) Performance (SYF-4M type): 1. Ratio: 254: 1 (others available). 2. Mount bolt patterns 3.375 4.5 . 3. High strength alloy steel gear, all gear are heat treated. 4. Shipped with oil. 5. Includes special external crop guard seals. 6. Precision die cast tempered aluminum housing. 7. All critical electrical connections are encapsulated to resist penetration of moisture. 8. Specially designed for rugged irrigation duty. 9. Permanent magnet DC motor, 1/8 HP, 48Volt. 10. Class F rated insulation. 11. Minimal AMP draw: full load current at rated voltage, 2.45 AMPS. 12. Weight: 21.5 lbs (9.8 Kg). 13. Oil capacity: 0.13 gal (0.5 L) 14. Efficiency 90% Performance (SYF-4 type) 1. Ratio: 254: 1(others available) 2. Torque capacity: 3,500 1b.in(395 N.m). 3. Mount bolt patterns 3.375' x 4.5' 4. High strength alloy steel gear, all gear are heat treated. 5. Shipped with oil. 6. Includes special external crop guard seals. 7. Precision die cast tempered aluminum housing. 8. Includes easy installing shock absorbing motor to gearbox coupler. 9. Accepts NEMA 48-C face motors with 0.5' shafts, 1-9/16' long. 10.Weight: 15.5 lbs(7.1Kg). 11.Oil capacity: 0.13 gal(0.5L) 12.Efficiency 90% Gear motor installation and contour dimension(SYF-4M type) (dimensions are in inch) Gear motor installation and contour dimension(SYF-4 type) (dimensions are in inch)