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The Scag STHM - Three-Wheel Riding Mower
This Rider Puts Productivity at the Forefront.

The Scag STHM three-wheel rider is an efficiency leader with a durable out-front Advantage deck or Velocity Plus deck design for maximum stability, outstanding maneuverability and superior trimming performance.

The STHM's reliable hydrostatic drive system is more powerful, runs smoother and lasts longer than any commercial hydrostatic transaxle drive on the market today. Controlled by a single foot pedal, two high-powered cast-iron wheel motors work in conjunction with a high-efficiency pump to evenly distribute power to both drive wheels.

This mower features an ultra-low center-of-gravity that gives it incredible hillside stability. The STHM, equipped with an Advantage or Velocity Plus cutter deck, is a serious mowing machine.

Ask any STHM owner and they will be happy to tell you about it. Talk to your Scag dealer about a field demonstration on the STHM, one of the most dependable commercial mowers money can buy!

* Limited availability. Contact your local Scag dealer for specific availability information.
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PRODUCT HIGHLIGHTStop of page
PRODUCT DETAILStop of page

Sundstrand hydraulic pump / Ogura clutch

Hydraulic oil cooler

Foot pedal speed control
  • Heavy-duty drive system includes a single Sauer-Sundstrand pump and dual wheel motors for reliable maneuverability.
  • Powerful, proven 23hp Kohler Command engine.
  • 5 gallon fuel capacity keeps you in the field cutting grass.
  • 20-inch drive tires feature a radius edge for better flotation and less turf tearing. Wider stance allows for superior stability on hillsides.
  • Heavy-duty Flat-Free caster wheels with quick pin removal for easy maintenance and cutting height adjustments. Semi-pneumatic tire design virtually eliminates downtime and expense resulting from front flat tires.
  • Front mounted 61" Velocity Plus or 72" Advantage cutter deck makes for easy trimming and mowing around and under low hanging trees and shrubs.
  • Marbain cutter blades stay sharp longer for reduced maintenance. Heavy-duty blade drive spindles provide unbeatable performance.
  • Infinitely variable ground speeds up to 6.8 mph forward.
  • Cutter deck shock absorber for better deck flotation and a smoother cut.
  • High capacity hydraulic cooling system features rust-free nylon reservoir and heavy-duty oil cooler for lower operating temperatures and longer life.
  • Operator friendly instrument panel includes an hour meter, ammeter, ignition switch, mower engagement switch, and separate choke and throttle controls.
  • Ogura PTO clutch brake engages the cutter blades. Adjustable airgap ensures long component life.
  • Simple, user-friendly design allows quick access to the engine and filters, for easy maintenance.
  • Coil spring seat for added operator comfort.
  • Interlocked parking brake system prevents movement while trailering or when parking on slopes. Mower will not move with the brake engaged to prevent premature brake wear.
  • The Scag "Simply the Best" commercial warranty stands behind you and your STHM for years of profitable service.
  • There are many productive accessories for the STHM like a high-performance mulching kit.
  • High-quality bearings and bearing debris guard on idler pulleys ensure long, reliable service.
  • Double stacked roller bearings in cutter deck idler pulley adds to reliability.
  • The oil drain system makes oil changes clean and easy. Just place a piece of hose over the down spout and direct the other end into a suitable waste oil receptacle. Then turn the valve to drain the oil. No mess!
  • A patented, hand crank lift system easily lifts the deck for transport or maintenance.
  • Split front cutter deck roller ensures free movement of the anti-scalp rollers to prevent turf damage.
* Limited availability. Contact your local Scag dealer for specific availability information.
Actual ground speed may vary. Specifications subject to change without notice or obligation.
SCAG STHM MOWER OPTIONS/ ENGINE AND CUTTER DECK COMBINATIONS*top of page
STHM61V-23CV* Three-Wheel Rider; 61" Velocity Plus Cutter Deck, 23hp Kohler air-cooled engine
STHM72A-23CV* Three-Wheel Rider; 72" Advantage Cutter Deck, 23hp Kohler air-cooled engine

* Extremely limited availability. Contact your local Scag Dealer.

PRODUCT DIMENSIONS**top of page
STHM - Product Dimensions 61" STHM 72" STHM
Length 110" 115"
Width (chute down) 73.5" 83.5"
Width (chute in transport position) 62" 73"
Weight: 950 lbs 980 lbs.

** Dimensions are subject to change.
TESTIMONIALS (click here for more customer comments)top of page
Dave Sime,
Superintendent at
Benson Golf Club,
Benson MN
"I ran my first 72" Scag STHM 10 years and 6,000 hours from 1991 to 2001. It is a real workhorse with very few problems. I like how it is low to the ground for going around trees and operator comfort. My new Scag 72" purchased in June 2001 already has 800 hours and no problems. I like the bigger 23hp engine because the extra horsepower really helps out in thick grass and the electric clutch saves wear and tear."
Jeff Sensenig,
Owner of S&S Lawn Care, Lancaster PA
S&S started with an STH in 1988 and still owns a 1994 STHM with 3300 hours. "Scag's construction and service is better than any other mower. No other mowing product out there is as good as Scag. Our employees are hard on equipment and Scag holds up."
Billy Peek,
Secretary Treasurer of Peek Lawn Maintenance, GA
"My oldest STHM has over 8000 hours on it and it's still running strong. This mower stays on banks better than any other mower. We can cut under bushes and trees without weed eating or trimming. But the main thing is they're trouble-free. We never have to leave the jobsite because of a breakdown. It just doesn't happen. I don't like them, I love them!"