Maintenance

valves must be in the “released” position on the hydros).

13.If the hub moves very freely relative to the caliper, then tighten the standard nut one turn against the swivel and repeat step 11.

14.Once step 11 is achieved, hold the threaded rod end with a tool and tighten the lock nut against the standard nut. Do Not allow the cable to turn when the nuts are tightened.

15.After adjusting the brakes on both sides of the mower, cycle the brake handle a minimum of six times to allow the cable to seat into the sheath and mounting tabs.

16.Readjust both brakes following the procedure in steps 10 through 14.

17.If a brake component has been removed or replaced, see the steps below; otherwise proceed to step 18.

Burnishing the Brake Procedure:

A.Clear the area of any flammable material before starting the burnishing process.

B.Rotate the drive wheel release handle to the “operating” position. Refer to the Drive Wheel Release Valves section in Operation.

C.Apply the park brake.

D.Install a 1/2 x 6 inch (approx.) rod or bolt through the 2 inch height of cut hole (see Figure 31).

WARNING

Engine must be running and drive wheels must be turning so park brake adjustment can be performed. Contact with moving parts or hot surfaces may cause personal injury.

Keep fingers, hands, and clothing clear of rotating components and hot surfaces.

F.Release the park brake so the handle rests on the 1/2 x 6 inch rod or bolt.

G.Move the throttle to high idle.

H.Move both motion control levers to the full forward position and hold for 15 seconds.

I.Move both motion control levers to the full reverse position and hold for 15 seconds.

J.Turn off the engine and completely release the park brake by removing the 1/2 x 6 inch rod or bolt.

K.Allow the hubs to cool until they are cool enough to safely touch.

L.Rotate the drive wheel release handle to the “released” position. Refer to the Drive Wheel Release Valves section in Operation.

M.Readjust both brakes following the procedure in steps 10 through 14.

18.Rotate the drive wheel release handle to the “operating” position. Refer to the Drive Wheel Release Valves section in Operation.

19.Install the rear tires and torque lug nuts to 90-95 ft-lb (122-129 N-m).

20.Remove jack stands.

Figure 31

1.2 inch height of cut location

E.Start the mower while in the operator position.

Electric Clutch Adjustment

No adjustment necessary.

Motion Control Linkage Adjustment

Located on either side of the fuel tank, below the seat are the pump control linkages. Rotating the pump linkage with a 1/2 inch wrench allows fine tuning adjustments so that the machine does not move in

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Exmark 4500-507 manual Electric Clutch Adjustment, Motion Control Linkage Adjustment