02. BASIC SERVICING KNOWLEDGE
1. Installing bearings
When installing a bearing onto a shaft, tap its
inner race with a mallet as shown in Figure 02.1.
When installing a bearing into a case, tap its outer
race.
When removing, use the same procedure as for
installing.
2. “O”-rings
① Use “O”-rings free from molding fault or damage.
② Clean “O”-rings and their mounting area and apply grease or hydraulic oil to them.
③ When installing “O”-rings, do not expand them so excessively that they suffer permanent
deformation. Also do not roll them when installing; otherwise they might stay twisted, causing oil
leakage.
④ When using an “O”-ring and back-up ring as
a set, such as when hydraulic pressure is high,
position the “O”-ring at the side which receives
the oil pressure.
3. Oil seals
① Oil seals should be installed with the seal lip pointed toward the lubrication or hydraulic oil.
② When installing an oil seal on a housing, apply a thin coat of packing cementing agent on the
oil seal outer ring and inside the housing to prevent oil leakage through the fitting area. It is
recommended to use a suitable jig to apply uniform pressure when mounting oil seals.
Fig. 02.1 Installing bearings
JIG
Fig. 02.2 “O”-ring location
Pressure
Fig. 02.3 Installing Oil Seal
JIG JIG
JIG
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