Husqvarna MZ52 Operator's Manual

31TROUBLESHOOTINGProblem / CauseEngine will not startBlade switch is engagedSteering controls are not locked in the neutral positionPark brake is not activatedBattery is deadContamination in the carburetor or fuel lineFuel supply shutoff valve is closedClogged fuel filter or fuel lineIgnition system faultyStarter does not turn the engine overDead batteryPoor contact of the battery terminal cable connectionsBlown fuseFault in the starter safety circuit. See Safety System inthe Maintenance SectionEngine runs roughFaulty carburetorClogged fuel filter or jetChoke engaged with a warm engineClogged ventilation valve on the fuel capFuel tank nearly emptyFouled spark plugsRich fuel mixture or fuel-air mixture.Wrong fuel typeWater in fuelClogged air filterEngine seems weakClogged air filterFouled spark plugsCarburetor incorrectly adjustedAir trapped in hydraulic systemMachine vibratesBlades are looseBlades are incorrectly balancedEngine is looseEngine overheatsClogged air intake or cooling finsEngine overloadedPoor ventilation around engineDefective engine speed regulatorToo little or no oil in the engineContamination in the fuel line.Fouled spark plugsBattery not chargingPoor contact of the battery terminal cable connectionsCharging lead is disconnectedFault in engine charging systemMachine moves slowly, unevenly, or not at allPark brake onBypass linkage engagedDrive belt for the transmission slack or has come offAir trapped in hydraulic systemMower deck not engagingDrive belt for the mower deck has come looseContact for the electromagnetic coupling has loosenedBlade switch is faulty or has come loose from cablecontactBlown fuseTransaxle leaks oilDamaged seals, housing, or gasketsAir trapped in hydraulic systemUneven mowing resultsDifferent air pressure in tires on the left and right sides.Bent bladesSuspending for the mower deck is unevenBlades are dullDriving speed too highGrass is too longGrass collected under the mower deck