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Table of Contents

SECTION 6 - ADJUSTMENTS

23

6.1 PARKING BRAKE ADJUSTMENT

23

6.2 TRAVEL ADJUSTMENTS

24

6.3 Throttle Control and Choke Adjustments

25

6.4 BELT ADJUSTMENT

25

6.5 BELT ALIGNMENT

26

6.6 CUTTER DECK ADJUSTMENTS

26

6.7 Custom-Cut Baffle Adjustment

28

6.8 electric clutch adjustment

30

SECTION 7 - MAINTENANCE

31

7.1 Maintenance Chart - Recommended Service Intervals

31

7.2 Lubrication

32

7.3 Hydraulic System

34

7.4 Engine Oil

35

7.5 Engine Fuel System

35

7.6 Engine Air Cleaner

36

7.7 Battery

37

7.8 Drive Belts

38

7.9 Cutter Blades

38

7.10 Tires

39

7.11 Cutter Deck Gearbox

39

7.12 Cooling System

40

7.13 Body, Deck, And Upholstery

41

SECTION 8 - ILLUSTRATED PARTS LIST

42

8.1 Scag Approved Attachments And Accessories

42

NOTES

43

61V & 72VS CUTTER DECKS

44

CUTTER DECK CONTROLS

46

SHEET METAL COMPONENTS

48

STT ROLL-OVER PROTECTION SYSTEM - WITH SUSPENSION SEAT

50

DECK DRIVE COMPONENTS

52

ENGINE & ATTACHING PARTS - 31HP-EFI KOHLER

54

BRAKE AND STEERING COMPONENTS

56

FUEL AND HYDRAULIC SYSTEM - KOHLER 31EFI

58

BDP-16A HYDRAULIC PUMP ASSEMBLY WITH COOLING FAN

60

ELECTRICAL SYSTEM (31HP-EFI KOHLER)

62

REPLACEMENT DECALS AND INFORMATION PLATES

64

ELECTRICAL SCHEMATIC (KOHLER 31HP - EFI)

66

LIMITED WARRANTY - COMMERCIAL EQUIPMENT

Following Section 8

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Scag Power Equipment STT-31EFI-SS operating instructions Following Section, Adjustments
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STT-31EFI-SS specifications

Scag Power Equipment is renowned for producing high-quality commercial mowing equipment, and the STT-31EFI-SS stand-on mower is no exception. Designed with professional landscapers in mind, the STT-31EFI-SS offers a perfect blend of power, efficiency, and maneuverability.

One of the standout features of the STT-31EFI-SS is its 31 hp EFI (Electronic Fuel Injection) engine. This powerhouse engine not only delivers impressive power but also enhances fuel efficiency. The EFI technology ensures that the engine operates at optimal performance by automatically adjusting the air-to-fuel ratio under varying conditions. This results in smoother starts, improved throttle response, and reduced emissions, making the mower both environmentally friendly and cost-effective in the long run.

The STT-31EFI-SS features a durable construction built to withstand the rigors of commercial use. Its robust steel frame and heavy-duty components are designed for maximum longevity. Moreover, the mower is equipped with Scag's cutting-edge Hydro-Gear ZT-3400 transmission, which offers exceptional speed and agility. This transmission allows operators to navigate tight spaces with ease and provides a top speed of up to 10.5 mph, making it ideal for large properties or demanding mowing tasks.

Operator comfort is another key aspect of the STT-31EFI-SS. The stand-on design promotes better visibility and quick maneuverability, enabling operators to navigate obstacles with confidence. The padded operator platform and adjustable controls ensure a comfortable experience, even during extended use. Additionally, the mower’s low center of gravity enhances stability on slopes and uneven terrain.

One of the most notable characteristics of the STT-31EFI-SS is its advanced cutting deck. The mower features a 48", 52", or 61" Velocity Plus cutting deck, which is known for delivering a superior cut and impressive grass dispersal. The deck is engineered for optimal airflow, enabling precision mowing while preventing clumping. This technology ensures that grass clippings are evenly distributed, resulting in a healthier lawn appearance.

In conclusion, the Scag STT-31EFI-SS stand-on mower integrates powerful performance, innovative engineering, and comfort. Featuring a reliable EFI engine, robust construction, and exceptional maneuverability, this mower stands out as an excellent choice for professional landscapers seeking efficiency and reliability in their equipment.
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