2. TRACTOR REQUIREMENTS The tractor used to operate the mower must have the power capacity to lift, pull, and operate the Power Take Off (PTO) at the mower’s rated speed while traveling at a ground speed between 2 and 5 MPH. Operating the mower with a tractor that does not meet the following requirements may cause tractor or mower damage and be a potential danger to the operator and passersby.
Tractor Requirements and Capabilities • ASABE approved Roll-Over Protective Structure (ROPS) or ROPS cab and seat belt. • Tractor Safety Devices ..................................... Slow Moving Vehicle (SMV) emblem, lighting, PTO master shield •
Tractor Horsepower: -Minimum .................................. Lift - 45 HP, Pull - 30 HP -Maximum.................................. 90 HP •
Drawbar Vertical Load Minimum Capacity ....... 600 lbs. •
Hitch -Lift Type Mower: - Lifting Capacity ........................ 1300 lbs. -
3-Point Hitch............................ CAT II Standard. Cat I Optional -Semi-Mount: -3 Point Hitch ............................. Cat II Standard. Cat I Optional -Hydraulics................................. Optional -Pull Type Mower: -Drawbar.................................... Positioned 14” from PTO stub end to hitch hole -Hydraulics................................. Optional • Front End Weight ............................................. As needed to maintain 20% weight on front axle • Power Take Off................................................. 540 RPM 6-spline, 1-3/8” diameter output shaft
This is from their online manual.
I figure the engineers who designed it know more about it than a random person on the internet. Sure, companies will hedge their bets and you may be able to use a little less tractor than they recommend. Ultimately, it is up to your judgment and how comfortable you are with the equipment. I hope this helps!