Kohler Confidant ZT710 - User Manual

16 590 01 Rev. A
KohlerEngines.com
ZT710-ZT740
Owner's Manual
IMPORTANT: Read all safety precautions and instructions carefully before
operating equipment. Refer to operating instruction of
equipment that this engine powers.
Ensure engine is stopped and level before performing any
maintenance or service.
Warranty coverage as outlined in the warranty card and on
KohlerEngines.com. Please review carefully as it provides you
specifi c rights and obligations.
To maintain compliance with applicable emission regulations,
exhaust system backpressure may not exceed limits which can
be found on KohlerEngines.com. Search by Model No., select
Read More, then select Specs tab.
Record engine information to reference when ordering parts or obtaining warranty coverage.
Engine Model
Specifi cation
Serial Number
Purchase Date
EN
ESS
FRC

Summary

Safety Precautions

Pre-Start Checklist

Starting

Stopping

Angle of Operation

Engine Speed

High Altitude Operation

Cold Weather Starting Hints

Maintenance Instructions

Maintenance Schedule

Lists required maintenance tasks at different hour intervals for engine upkeep.

Oil Recommendations

Guides on selecting and checking engine oil based on temperature and type.

Check Oil Level

Step-by-step instructions for checking and maintaining the engine oil level.

Change Oil and Filter

Fuel Recommendations

Spark Plugs

Air Cleaner

Air Cooling

Repairs;Service Parts

Storage

Troubleshooting

Engine Specifications

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features
5. Safety Precautions

The provided document is an owner's manual for the Kohler Confidant ZT710-ZT740 engine series. This manual details the operation, maintenance, and safety precautions associated with these engines, which are designed to power various equipment.

Function Description

The Kohler Confidant ZT710-ZT740 engines are internal combustion engines designed for use in equipment requiring reliable power. While the specific equipment it powers is not detailed in this manual, the general context of an "owner's manual" and "operating instruction of equipment that this engine powers" suggests applications such as lawn mowers, generators, or other outdoor power equipment. The engine's design incorporates features for ease of maintenance and compliance with emission regulations.

Important Technical Specifications

The manual provides key technical specifications for the ZT710, ZT720, ZT730, and ZT740 models:

• Bore: 3.27 inches (83 mm) for all models.
• Stroke:
  • ZT710, ZT720: 2.6 inches (67 mm)
  • ZT730, ZT740: 2.7 inches (69 mm)
• Displacement:
  • ZT710, ZT720: 44.2 cubic inches (725 cc)
  • ZT730, ZT740: 45.6 cubic inches (747 cc)
• Oil Capacity (Refill): 2.0 U.S. quarts (1.9 L) for all models.
• Spark Plug Gap: 0.03 inches (0.76 mm) for all models.
• Maximum Angle of Operation (@ full oil level): 25° for all models. Exceeding this angle can cause engine damage due to insufficient lubrication.
• Exhaust Emission Control System: EM for U.S. EPA, California, and Europe for models ZT710-ZT740.
• Horsepower (hp) References: Kohler's hp references are Certified Power Ratings per SAE J1940 & J1995 hp standards.

Usage Features

The manual outlines several usage features and considerations:

• Pre-Start Checklist: Before starting, users must check oil and fuel levels, inspect for leaks, clean cooling and air intake areas, ensure all components and guards are securely fastened, and check the spark arrestor (if equipped).
• Starting Procedure: The manual advises referring to the equipment's operating instructions for specific starting procedures. It includes notes on extending the starter cord periodically to check its condition and, for retractable starts, slowly pulling the handle past compression-STOP before a firm pull.
• Stopping Procedure: To stop the engine, users should disengage any PTO driven attachments if possible, then position the throttle control between half and full throttle before stopping the engine.
• Cold Weather Starting Hints: For cold weather, it's recommended to use proper oil for the expected temperature, disengage all external loads, and use fresh winter-grade fuel with higher volatility.
• High Altitude Operation: The engine may require a high-altitude carburetor kit for operation above 4000 ft (1219 meters). Operating without the correct kit or operating a kitted engine below 4000 ft can cause damage.
• Fuel Requirements: The engine requires clean, fresh, unleaded gasoline with an octane rating of 87 (R+M)/2 or higher (90 RON minimum). Gasoline up to 10% ethyl alcohol is acceptable, as are MTBE and unleaded gasoline blends (max 15% MTBE by volume). E15, E20, and E85 are not approved and their use voids the warranty. Users should not add oil to gasoline, overfill the tank, or use gasoline older than 30 days. Low permeation fuel lines are required for EPA and CARB compliance.
• Oil Sentry™ (if equipped): This switch prevents the engine from starting in low or no oil conditions. It may not shut down a running engine before damage occurs and might activate a warning signal in some applications.

Maintenance Features

The manual emphasizes regular maintenance to ensure optimal performance and longevity.

• Maintenance Schedule:
  • Every 25 Hours (or more frequently under severe conditions): Service/replace precleaner, replace air cleaner element (if not equipped with precleaner).
  • Every 100 Hours (or more frequently under severe conditions): Replace air cleaner element (if equipped with precleaner), change oil and filter, remove cooling shrouds and clean cooling areas.
  • Every 100 Hours: Check all fasteners for security, replace fuel filter.
  • Every 500 Hours: Have valve lash checked/adjusted (by an authorized dealer), replace spark plugs and set gap.
• Oil Recommendations: Kohler oils are recommended, but other high-quality detergent oils (including synthetic) of API service class SJ or higher are acceptable. Viscosity should be selected based on ambient air temperature (e.g., 5W-30, 10W-30, SAE 30).
• Checking Oil Level: Ensure the engine is cool and level. Remove, wipe, reinsert, and remove the dipstick to check the level, which should be at the top of the indicator. Add oil if low.
• Changing Oil and Filter: Change oil while the engine is warm. Clean the oil fill/dipstick and drain plug areas. Remove the drain plug and oil fill cap/dipstick to drain oil. Clean around the oil filter, remove it, and wipe the mounting surface. Reinstall the drain plug (torque to 10 ft. lb. / 13.6 N·m). Fill a new filter with oil, apply a thin film of clean oil to its gasket, and install it according to instructions. Fill the crankcase to the top of the dipstick indicator. Reinstall the cap/dipstick. Start the engine to check for leaks, then stop and recheck the oil level. Dispose of used oil and filter according to local ordinances.
• Spark Plugs: Clean the recess, check the gap (0.03 in. / 0.76 mm), install into the cylinder head, and torque to 20 ft. lb. (27 N·m).
• Air Cleaner: Operating with loose or damaged air cleaner components can cause premature wear. The manual details servicing the precleaner (wash with detergent, rinse, air dry, lightly oil, squeeze out excess) and replacing the paper element. The paper element cannot be blown out with compressed air.
• Breather Tube: Ensure both ends are properly connected.
• Air Cooling: Proper cooling is essential. Clean screens, cooling fins, and external surfaces to prevent overheating. Avoid spraying water on wiring harnesses or electrical components.
• Repairs/Service Parts: Kohler recommends using an authorized dealer for all maintenance, service, and engine parts.
• Storage: For storage of 2 months or more: add Kohler PRO Series fuel treatment (or equivalent) and run the engine for 2-3 minutes. Change the oil while warm. Remove spark plugs, pour about 1 oz. of engine oil into cylinders, replace plugs, and crank slowly. Disconnect the negative battery cable. Store the engine in a clean, dry place.

Safety Precautions

The manual highlights critical safety warnings:

• Explosive Fuel: Gasoline is extremely flammable. Do not fill the fuel tank while the engine is hot or running. Store gasoline in approved, well-ventilated containers away from sparks or flames. Never use gasoline as a cleaning agent.
• Carbon Monoxide: Engine exhaust contains poisonous carbon monoxide, which is odorless, colorless, and can cause severe nausea, fainting, or death. Avoid inhaling exhaust fumes.
• Accidental Starts: Disconnect and ground spark plug lead(s) and disconnect the negative battery cable before servicing the engine or equipment to prevent severe injury or death.
• Rotating Parts: Keep hands, feet, hair, and clothing away from all moving parts during operation. Never operate the engine with covers, shrouds, or guards removed.
• Electrical Shock: Do not touch wires while the engine is running.
• Hot Parts: Engine parts can cause severe burns. Do not touch the engine while operating or just after stopping. Never operate the engine with heat shields or guards removed.
• California Proposition 65 Warning: Engine exhaust contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Kohler Confidant ZT710 Specifications