The 1986 Yazoo Mower is a commercial-grade zero-turn riding mower featuring a powerful engine, durable cutting deck, hydrostatic transmission, and robust construction for professional landscaping use. This repair manual covers comprehensive maintenance procedures, troubleshooting guides, parts identification, and step-by-step repair instructions for all major components including engine systems, cutting deck, transmission, electrical systems, and safety features.
Always follow safety procedures when servicing your Yazoo mower to prevent injury and equipment damage.
| Safety Area | Precaution |
|---|---|
| Engine Operation | Allow engine to cool before servicing; disconnect spark plug during maintenance |
| Blade Service | Wear cut-resistant gloves; ensure blades are secured properly |
| Fuel System | Work in well-ventilated area; no smoking near fuel |
| Electrical System | Disconnect battery before electrical work; avoid short circuits |
| Hydraulic System | Relieve pressure before disconnecting hydraulic lines |
| Lifting Equipment | Use proper jack stands; never work under unsupported mower |
Regular engine maintenance ensures optimal performance and longevity.
WARNING! Always disconnect spark plug wire before performing engine maintenance.
The cutting deck requires regular inspection and maintenance for optimal performance.
Hydrostatic transmission maintenance ensures smooth operation and long service life.
| Component | Service Interval | Procedure |
|---|---|---|
| Transmission Fluid | Every 400 hours | Drain and refill with 20W-50 hydraulic oil |
| Drive Belts | Inspect every 50 hours | Check for cracks; replace if worn |
| Pump Linkage | Lubricate every 25 hours | Apply lithium grease to control rods |
| Wheel Motors | Check annually | Inspect for leaks; test pressure |
Proper electrical system maintenance ensures reliable starting and operation.
The hydraulic system requires careful maintenance to prevent failures.
CAUTION! Never use petroleum-based fluids in hydraulic system.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine won't start | Dead battery, faulty solenoid | Charge battery; test solenoid; check safety switches |
| Poor cutting quality | Dull blades, incorrect deck height | Sharpen blades; level cutting deck; check belt tension |
| Loss of power | Clogged air filter, fuel issues | Clean/replace air filter; check fuel lines and filter |
| Hydrostatic issues | Low fluid, worn belts | Check fluid level; inspect drive belts; test pump pressure |
| Electrical problems | Corroded connections, bad ground | Clean battery terminals; check ground connection |
Reference diagrams available for all major assemblies including engine, cutting deck, transmission, and control systems. Each diagram includes part numbers and exploded views for proper assembly and ordering of replacement parts.
1986 Yazoo mowers carry a 2-year commercial warranty covering defects in materials and workmanship. Warranty does not cover normal wear items, improper maintenance, or damage from abuse. Keep maintenance records for warranty claims. Contact authorized Yazoo dealers for warranty service.