Husqvarna Z554X Owner Manual - Page 29
Transmission Purging, Moving Machine By Hand
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L U B R I C AT I O N 4. After the oil has drained remove the filter from the housing. 5. Install a new filter and gasket into the filter cover and install the assembly into the transaxle, turning it three-quarters to one full turn after the filter gasket contacts the filter base surface. 6. Repeat the procedure the opposite side. 7. Remove the top fill port plug from the left and right side transaxles. 8. Fill with 20W50 motor oil until the oil appears at the bottom of each transaxles' top port, approximately 2 quarts (1.89 liters) per transaxle, 4 quarts (3.78 liters) total. 9. Install the fill plugs into each transaxle as the oil level reaches the port. Torque the top port plugs to 180 in./lbs. 10. Continue to fill the transaxles through the expansion tank until the FULL COLD line is reached. This will take approximately 23 additional ounces (.68 liter). 11. Reinstall the expansion tank cap by hand. Do not overtighten. Transmission Purging Due to the effects air has on efficiency in hydrostatic drive applications, it is critical to purge the system. Perform the procedure first with the vehicle drive wheels off the ground, then repeated under normal operating conditions. Resulting symptoms in hydrostatic systems may be: • Noisy operation. • Lack of power or drive after short term operation. • High operation temperature and excessive expansion of oil. • Shortened component life. Purge procedures must be implemented if the hydrostatic system has been opened for maintenance or when more oil has been added to the system. Before starting, make sure the oil tank is at the proper oil level. If not, fill to the specifications outlined above. See Moving Machine By Hand in the Operation section for bypass linkage adjustments. 1. Release the park brake. 2. With the bypass valve open and the engine running at fast idle, slowly move the steering controls in the forward and reverse directions five or six times. As air is purged from the unit, the oil level will drop. 3. With the bypass linkage valve and the engine running, slowly move the steering controls in the forward and reverse directions five or six times. Check the oil level and add oil as required after stopping the engine. 4. It may be necessary to repeat Steps 2 and 3 until all the air is completely purged from the system. When the hydraulic drive operates at normal noise levels and moves smoothly forward and reverse at normal speeds, the hydraulic drive is considered purged. 29