Reply to "Gear noise"

bosswrenchMember

JD, noise from a ZF in a particular gear will usually come from two sources, both serious. The first is worn or chipped gears running against each other and the second is from a failing bearing or a cracked thrust washer. These all need a total tear-down to correct (or even to properly diagnose). Possible other reasons for noise are low lube- checkable by simply pulling the side fill-plug in the ZF. If lube drools out when the plug is pulled, the level is correct. If not, fill until it DOES drool out. Several fills with waiting periods between are needed 'cause the thick lube does not instantly find its level inside the cases. Or maybe the wrong lube: use 80W90 gear lube, preferably with anti-slip additive in it. This additive is nowadays commonly added by the lube mfgr. Note- 80W90 from a major mfgr; I am not a big fan of experimenting with magic lubes in a worn $8,000 ZF...

6/20/0911:02 AM

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