Exmark 4500-872 manual See Drive Wheel Release Valves section

Troubleshooting

Problem		Possible Cause		Corrective Action
Engine loses power	1.	Engine load is excessive	1.	Reduce the ground speed.
	2.	Air cleaner is dirty.	2.	Clean or replace the air cleaner element.
	3.	Oil level in the crankcase is low.	3.	Add oil to the crankcase.
	4.	Cooling fins and air passages for the	4.	Remove the obstructions from the cooling
		engine are plugged.		fins and air passages.
	5.	Dirt in fuel filter.	5.	Replace the fuel filter.
	6.	Dirt, water, or stale fuel is in the fuel	6.	Contact an Authorized Service Dealer.
		system.
Mower pulls left or right (with levers fully	1.	Tire pressure in drive tires not correct.	1.	Adjust tire pressure in the drive tires.
forward)
Machine does not drive	1.	Drive release handle not in “operating”	1.	Position handle in “operating” position;
		position.		see Drive Wheel Release Valves section
				in Operation.
	2.	Drive or pump belt is worn, loose or	2.	Change the belt.
		broken.
	3.	Drive or pump belt is off a pulley.	3.	Change the belt.
	4.	Broken or missing idler spring.	4.	Replace the spring.
	5.	Hydraulic fluid level is low or too hot.	5.	Add hydraulic fluid to reservoir or let it
				cool down.
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.	Blade spindle bent.	6.	Contact an Authorized Service Dealer.
	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.	Loose engine pulley, idler pulley, or blade	4.	Tighten the appropriate pulley.
		pulley.
	5.	Engine pulley is damaged.	5.	Contact an Authorized Service Dealer.
	6.	Blade spindle is bent.	6.	Contact an Authorized Service Dealer.
Blades do not rotate.	1.	Deck belt is worn, loose or broken.	1.	Install new deck belt.
	2.	Deck belt is off pulley.	2.	Install belt on clutch and deck pulleys,
				idlers, and tensioning idler per routing
				decal on deck.
	3.	Broken or missing idler spring.	3.	Replace the spring.
	4.	Drive belt not routed correctly.	4.	Refer to belt routing decal on deck.

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