Husqvarna MZ 52 Operator's Manual

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Transaxle Fluid ChangeThe transaxle is designed with an external filterfor ease of maintenance. To ensure constant fluidquality levels and longer life, an oil filter changeevery 200 hours is recommended.The following procedure is performed with thetransaxles installed in the mower and the moweron level ground. Apply the pump release valve foreach transaxle and engage the park brake.1. Remove the filter guard screws and filterguard. Clean any loose debris from aroundthe perimeter of the filter.2. Place an oil drain pan (30,5 cm or more indiameter and 7.6 liters capacity is optimal)beneath the oil filter. Remove the oil filter fromthe transaxle.3. After the oil has drained, wipe the filter basesurface and apply a film of new oil to thegasket of the replacement filter.4. Install the new filter by hand, turning it three-quarters to one full turn after the filter gasketcontacts the filter base surface.5. Install the filter guard. Torque screws to65 in/lbs. each.6. Do the steps on the opposite side.7. Drain used oil filters of all free flowingoil before disposal. Place used oil in anappropriate container and dispose of it inaccordance with laws in your area.8. Remove the top port plug from the left andright sides of the transaxles before filling withoil. This will allow the transaxles to vent duringoil fill.9. Remove the cap from the transaxles’expansion tank found on the vehicle frame.10. Fill with 20W50 motor oil until oil just appearsat the bottom of each transaxles’ top port(approximately two quarts per transaxle, fourquarts total). Install the top port plug into eachtransaxle as the oil level reaches the port.11. Install and torque the top port plugs to180 in./lbs.12. Continue to fill the transaxles through theexpansion tank until the FULL COLD lineis reached (this will take approximately 23additional ounces).13. Install the expansion tank cap by hand. Do notovertighten.Transmission PurgingPurge procedures must be done if the hydrostaticsystem has been opened for maintenance or hashad more oil added to the system.Due to the effects air has on efficiency inhydrostatic drive applications, it is critical topurge the system. Resulting symptoms of air inhydrostatic systems can be:• Noisy operation.• Lack of power or drive after short termoperation.• High operation temperature and excessiveexpansion of oil.• Shortened component life.Before starting, make sure the oil tank is at thecorrect oil level. If not, fill to the specificationsoutlined above.Do the procedure first with the vehicle drivewheels off the ground, then again under normaloperating conditions.See Moving Machine By Hand in the Operationsection for bypass linkage adjustments.1. Disengage the brake if activated.2. With the bypass linkage open and theengine running at fast idle, slowly move thedirectional control in both forward and reversedirections (5 or 6 times). As air is purged fromthe unit, the oil level will drop.3. With the bypass linkage closed and theengine running, slowly move the directionalcontrol in both forward and reverse directions(5 to 6 times). Check the oil level and add oilas necessary after stopping the engine.4. It can be necessary to do Steps 2 and 3until all the air is completely purged from thesystem. When the hydraulic drive operatesat normal noise levels and moves smoothlyforward and reverse at normal speeds, thehydraulic drive is considered purged.5. After the vehicle has been used two times, theoil level must be checked while the oil is coldand adjusted accordingly.30LUBRICATION