Model
Code Page
13. Repair
131.1
1.8.2005
3
N91c---N111c
N91h---N141h
N121LS, N141LS
41
4
5
3
2
1
fig003c
The main parts of lip---type seal:
1. Case
2. Sealing element
3. Ring spring
The figure above shows the construction of a simple lip---
type seal. The cross section shows the heel (4) and the toe
(5), used to identify the sides of a single element seal. With
a few exceptions, the toe of a single---lip is located on the
lubricant side. Some seals have a second auxiliary lip
which has no spring.
Cables and wires
When removing or disconnect ing a group of cables or
wires, label each one to ensure correct refitment.
Locking devices
fig004c
Correct and incorrect use of retainers
fig005c
Correct and incorrect method of fitting and bending locking
tabs.
Slackening of nuts and bolts is prevented by mechanical
means such as lockwashers, tab washers and cotter pins,
or by Loctite---type locking agents.
Flat retainers must be installed properly to be effective.
Bendoneendoftheretaineragainsttheedgeofthe part.
Bend the other end against one of the nut or bolt head.Al-
ways fit new retainers in compartments which house mov-
ing parts. When fitting lockwas hers on aluminium housings,
place a flat washer between the lockwasher and the hous-
ing.
Note!
1) Never fit a lockwasher (Grower, fan, spring, etc.) under a
nut or bolt to which a specified torque has to be applied.
2) Always thoroughly degrease components before apply-
ing Loctite type locking agents.
Bushes and press fits
Do not fit bushes with a hammer alone. Use a suitable fit-
ting tool and a hammer or, better still, a press if possible.
When using a press, ensure that pressure is applied directly
in line with the bore. If the ring has an oil hole, take care to
align it with the oil hole in the mating part. When press fit-
ting a part into another part, lubricate the mating surfaces.
Tapered parts should be assembled dry. Before assembly,
check that the tapers are dry and free from burrs.
Fitting bolts in blind holes
Use bolts of the correct length. A bolt which is too long may
”bottom” before the head comes into contact with the part it
is to hold: this will cause damage to the threads. If a bolt is
too short, there may not be enough threads engaged to
hold the part securely.
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