1986 Yazoo Model S22 Motor Parts Manual

The 1986 Yazoo Model S22 is a commercial-grade riding mower featuring a 22-horsepower engine, 52-inch cutting deck, hydrostatic transmission, and heavy-duty construction for professional landscaping use. This parts manual provides comprehensive information on engine components, cutting system, transmission, electrical system, and maintenance procedures. Below are key sections for specifications, engine parts, cutting system, transmission, electrical components, and maintenance guidelines.

1. Specifications Overview 2. Engine Components 3. Cutting System Parts 4. Transmission & Drive System 5. Electrical System Components 6. Frame & Chassis Parts 7. Maintenance Procedures 8. Parts Ordering Information 9. Troubleshooting Guide 10. Safety Information

Specifications Overview

Key specifications for the 1986 Yazoo Model S22 riding mower including engine, cutting, and performance details.

Specification	Details
Engine Type	22 HP Kohler Command Pro OHV
Cutting Width	52 inches
Transmission	Hydrostatic drive with infinite speed control
Cutting Height	1.5 to 4.5 inches adjustable
Fuel Capacity	5 gallons
Weight	850 lbs
Blade Type	Triple blade system with high-lift design
Turning Radius	Zero-turn capability
Max Speed	8 mph forward, 4 mph reverse
Deck Material	10-gauge reinforced steel

Engine Components

Complete breakdown of engine parts and specifications for the 22HP Kohler Command Pro engine.

Cylinder Head Assembly: Includes valves, springs, and rocker arms
Piston & Connecting Rod: Forged aluminum piston with chrome rings
Crankshaft: Balanced forged steel with keyway for PTO
Carburetor: Walbro float-type with adjustable jet
Ignition System: Solid-state electronic ignition with coil
Air Filter: Dual-element paper and foam filter
Oil System: Full-pressure lubrication with spin-on filter

WARNING! Engine components operate at high temperatures; allow cooling before servicing.

Cutting System Parts

Detailed parts listing for the 52-inch cutting deck and blade system.

Cutting Blades: Part #YZ-2252-BL (set of 3)
Spindle Assemblies: Heavy-duty sealed bearing design
Deck Belt: Part #YZ-2252-BT (1/2" x 95")
Deck Wheels: 8-inch anti-scalp wheels
Blade Mandrels: Forged steel with hex mounting
Deck Shell: 10-gauge steel construction
Baffles: Airflow management components

CAUTION! Always disconnect spark plug before servicing cutting system.

Transmission & Drive System

Hydrostatic Pump: Eaton series 2000 with integrated relief valves
Drive Motors: Dual wheel motors with planetary gear reduction
Drive Belts: Part #YZ-2252-DB (3/4" x 48")
Control Linkage: Dual lever zero-turn controls
Axles: 1-inch diameter heat-treated steel
Wheel Hubs: Cast iron with tapered roller bearings
Brake System: Mechanical disc brake on transmission output

Electrical System Components

Complete electrical system parts including starting, charging, and safety systems.

Starting System: 12V starter motor, solenoid, ignition switch

Charging System: 15-amp alternator with voltage regulator

Safety Components: Seat switch, blade engagement switch, neutral safety switch

Lighting: Headlight assembly, wiring harness, bulb sockets

Battery: Group U1R 12V 35AH with hold-down bracket

Frame & Chassis Parts

Structural components and chassis parts for the Model S22 frame.

Main Frame: 3x2-inch rectangular steel tubing
Rollover Protection: ROPS structure with mounting brackets
Seat Mount: Adjustable sliding mechanism
Foot Platform: Diamond plate steel with non-slip surface
Fender Assemblies: Steel fenders with rubber trim
Fuel Tank Mount: Steel brackets with rubber isolation

Tip: Inspect frame welds regularly for cracks or stress points.

Maintenance Procedures

Scheduled maintenance tasks and service intervals for optimal performance.

Oil Change: Every 50 hours with 10W-30 detergent oil
Air Filter: Clean every 25 hours, replace every 100 hours
Spark Plug: Replace every 100 hours (Champion RC12YC)
Blade Sharpening: Every 25 hours of operation
Deck Lubrication: Grease spindles every 8 hours
Transmission Fluid: Check level every 100 hours
Belt Inspection: Check tension and wear every 50 hours
Tire Pressure: Maintain 12 PSI in all tires

WARNING! Always use genuine Yazoo replacement parts for proper fit and performance.

Parts Ordering Information

How to identify and order replacement parts for your Yazoo Model S22.

Troubleshooting Guide

Common issues and solutions for the Model S22 mower.

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, or safety switch	Check fuel level, spark plug, safety switches
Poor cutting performance	Dull blades or deck clog	Sharpen blades, clean deck underside
Hydrostatic drive issues	Low fluid or linkage	Check fluid level, adjust control linkage
Excessive vibration	Unbalanced blades or loose components	Balance blades, check spindle tightness
Battery not charging	Alternator or wiring	Test alternator output, check connections

Service Support: Contact authorized Yazoo dealer for technical assistance

Safety Information

Critical safety information for operation and maintenance of the Model S22.

OPERATION SAFETY: Always wear eye protection, keep hands and feet away from moving parts, never carry passengers, operate on slopes less than 15 degrees, and be aware of your surroundings.

MAINTENANCE SAFETY: Always disconnect spark plug wire before servicing, use jack stands when working underneath, allow engine to cool before maintenance, and use proper lifting techniques.

EMERGENCY PROCEDURES: Know how to quickly shut off engine in emergency situations.