|Circle Makes the Seal|
Since the ends of these spinning axles that extend into the transmission must
share the same gear oil with the transmission, transaxle, transfer case, or
differential, the axle seal has two tasks. One is to keep the gear oil inside
the case that contains the gears and the ends of the axles. The other is to
keep crud, road grime, and rocks out of the transmission, ruining the whole
deal by converting the gears into rock crushers. Since the axles going into
the transmission, and the transmission itself are made of metal, the axle seal
houses a flexible seal that rides on the axle and keeps gear oil in, and crud
out. The flexible seal uses a small amount of the gear oil in conjunction with
the seal itself to achieve this task. The flexible seal is housed in a metal
carrier, which allows it to be pressed into the transmission or differential
Axle seals can simply wear out, but the most common cause of failure is
improper axle removal or installation. While the metal carrier of the seal is
sturdy, the flexible seal is fragile and can be easily torn by a ham-handed
installation of an incoming axle. Since installing new axle seals requires
removal of the axles, a great time to inspect and replace them is during axle
|Step 1 - This seal has seen better days. One common way seals fail is
when axles are removed, or installed improperly, thus tearing the rubber seal.
|Step 2 - Here is the new seal, ready to install. Note the spring on the
back of the flexible seal. Be careful not to drop this into the transmission
|Step 3 - First pry the old seal out of the differential or
transmission. A seal removal tool makes this task easy.
|Step 4 - seal and bearing race installation tool comes with different
sized discs. Choose one that fits into the seal mounting point, yet is only
slightly smaller then the seal itself.
|Step 5 - Next, seat the new seal level into the mount. Tap the seal
level into place with the seal tool until the seal is fully seated. Be careful
not to deform the seal.