Troubleshooting

Troubleshooting

Important: It is essential that all operator safety mechanisms be connected and in proper operating condition prior to mower use.

When a problem occurs, do not overlook the simple causes. For example: starting problems could be caused by an empty fuel tank.

The following table lists some of the common causes of trouble. Do Not attempt to service or replace major items or any items that call for special timing of adjustments procedures (such as valves, governor, etc.). Have this work done by your Engine Service Dealer.

Note: When disconnecting electrical connectors Do Not pull on the wires to separate the connectors.

Problem

 

Possible Cause

 

Corrective Action

 

 

 

 

 

Uneven cutting height.

1.

Blade(s) not sharp.

1.

Sharpen the blade(s).

 

2.

Cutting blade(s) is/are bent.

2.

Install new cutting blade(s).

 

3.

Mower deck is not level.

3.

Level mower deck from side-to-side and

 

 

 

 

front-to-rear.

 

4.

Underside of mower is dirty.

4.

Clean the underside of the mower.

 

5.

Tire pressure in drive tires not correct.

5.

Adjust tire pressure in the drive tires.

 

6.

Spacers are in wrong location.

6.

Position spacers under hairpins.

 

7.

Tips of adjacent blades are at an uneven

7.

Replace blades, spindles and (or) check

 

 

cutting height. Blades tips should be even

 

for damage to mower deck.

 

 

within 3/16 inch which is approximately

 

 

 

 

one blade thickness.

 

 

 

 

 

 

 

Abnormal vibration.

1.

Cutting blade(s) is/are bent or unbalanced.

1.

Install new cutting blade(s).

 

2.

Blade mounting bolt is loose.

2.

Tighten the blade mounting bolt.

 

3.

Engine mounting bolts are loose.

3.

Tighten the engine mounting bolts.

 

4.

Engine pulley is damaged.

4.

Contact an Authorized Service Dealer.

 

5.

Blade spindle is bent.

5.

Contact an Authorized Service Dealer.

 

 

 

 

 

Blades Do Not rotate.

1.

PTO belt is worn, loose, or broken.

1.

Check belt tension or replace belt

 

2.

PTO shaft is not connected.

2.

Connect PTO shaft.

 

3.

PTO belt is off pulley.

3.

Check belt for damage. Install belt and

 

 

 

 

check adjusting shafts and belt guides for

 

 

 

 

correct position.

 

 

 

 

 

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Exmark 4500-370 manual Troubleshooting, Problem Possible Cause Corrective Action