Exmark 850 Pre-Start, Operating Instructions, Drive Wheel Release Valves, PTO Engagement Lever

Models: 0 850

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Drive Wheel Release Valves

Operation

Drive Wheel Release Valves

Located on the top left front corner of hydrostatic pumps.

Drive wheel release valves are used to release the hydrostatic drive system to allow the machine to be pushed without the engine running. Tilt seat up to gain access to pumps.

With a 7/16 wrench, turn both valves one turn counterclockwise to release drive system. Turn clockwise to reset system. Do Not overtighten. Do

Not tow machine.

Tracking Adjustment Knob

Located under the seat on the left pump control link.

Rotating this knob allows fine tuning adjustments so that the machine tracks straight with the drive levers in the full forward position.

Run unit at 3/4 speed for at least 5 minutes to bring hydraulic oil up to operating temperature. Stop machine and wait for all moving parts to stop. Engage park brake. Tilt seat forward to gain access to the tracking knob. Rotate the knob towards the right to steer right and rotate towards the left to steer left. Adjust in 1/8 turn increments until the machine tracks straight. Check that the machine does not creep when in neutral with the park brakes disengaged.

Important: Do Not rotate the knob too far, as this may cause the machine to creep in neutral. Refer to the Motion Control Linkage Adjustment section in Maintenance.

PTO Engagement Lever

Located immediately left of the left console.

Lever must be moved up to the “ROTATE” position to engage the PTO and blower drives. Lever is moved down to the “STOP” position to stop the drives.

Engine Oil Temperature Light and Buzzer

Located on the right console.

The engine oil temperature light monitors the temperature of the engine oil. An illuminated engine oil temperature light and intermittent buzzing sound signals the engine is overheating.

Pre-Start

Fill fuel tanks. For best results use only clean, fresh regular grade unleaded gasoline with an octane rating of 87 or higher.

Important: Never use methanol, gasoline containing methanol, gasohol containing more than 10% ethanol, premium gasoline, or white gas because the fuel system could be damaged.

Do Not add oil to gasoline.

Do Not overfill fuel tank. Fill the fuel tank to the bottom of the filler neck. The empty space in the tank allows gasoline to expand. Overfilling may result in fuel leakage or damage to the engine or emission system (if equipped).

Make sure you understand the controls, their locations, their functions, and their safety requirements.

Refer to the Maintenance section and perform all the necessary inspection and maintenance steps.

Operating Instructions

Open the Fuel Shut-Off Valve

The fuel shut-off valve is located on the right side of unit in fuel line next to the fuel filter. Raise the hopper to access. Rotate the valve 1/4 counterclockwise to turn on fuel.

Starting the Engine

1.Move the speed control lever to the neutral position.

2.Pull up and back on the parking brake lever to engage the parking brake.

3.Push the PTO engagement lever down to the “STOP” position.

Note: It is not necessary for the operator to be in the seat to start the engine.

4.Place the throttle midway between the “SLOW” and “FAST” positions.

5.On a cold engine, push the choke lever forward into the “ON” position.

On a warm engine, leave the choke in the “OFF” position.

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Exmark 850 Pre-Start, Operating Instructions, Drive Wheel Release Valves, Tracking Adjustment Knob, PTO Engagement Lever