Yazoo/Kees ZMKW 5222 Operator's Manual

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lUbRICaTION47Purging ProceduresDue to the effects air has on efficiency in hydrostaticdrive applications, it is critical to purge the system.These purge procedures should be implementedany time a hydrostatic system has been opened tofacilitate maintenance or any additional oil has beenadded to the system.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.•Before starting, make sure the oil tank is at the properoil level. If not, fill to the specifications outlined above.The following procedures are best performed with thevehicle drive wheels off the ground, then repeatedunder normal operating conditions.Disengage the brake if activated.1.With the bypass valve open and the engine2.running at fast idle, slowly move the directionalcontrol in both forward and reverse directions (5or 6 times). As air is purged from the unit, the oillevel will drop.With the bypass valve closed and the engine3.running, slowly move the directional controlin both forward and reverse directions (5 to6 times). Check the oil level and add oil asrequired after stopping the engine.It may be necessary to repeat Steps 2 and 34.until 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.After the vehicle has been used two times, the5.oil level should be checked while the oil is coldand adjusted accordingly.