Precautions For Using Floating Seal - Hitachi ZW 100-G Workshop Manual

GENERAL / Precautions for Dissembling and Assembling

Precautions for Using Floating Seal

1. In general, replace the floating seal with a new
one after disassembling.
If the floating seal is required to be reused, follow
these procedures:
•
Keep seal rings together as a matched set with
seal ring (1) surfaces together. Apply oil onto
sliding surface (e) of seal ring (1).
•
Check sliding surface (e) of seal ring (1) for
scuffing, scoring, corrosion, deformation, or
uneven wear.
Check the step part of seal ring (1).
•
Check O-ring (2) for tears, breaks, deformation, or
hardening.
2. If incorrectly assembled, oil leakage or damage
will occur. Be sure to do the following to prevent
trouble.
•
Clean the floating seal and seal mounting bores
with cleaning solvent.
Use a wire brush to remove mud, rust, or dirt from
seal mounting bores. After cleaning, thoroughly
dry parts with compressed air.
•
Clean seal ring (1) and O-ring (2) mounting bores.
Check the bore surface for scuffing or scoring by
touching the surface with finger.
•
After installing the floating seal, check that O-ring
(2) is not twisted, and that it is installed correctly
on seal ring (1).
•
After installing the floating seal, check that O-ring
(2) and seal ring sliding surface (e) is parallel with
seal mating surface (f) by measuring the
distances (e) and (f) at point (A) and (B), as
illustrated. If these distances differ, correct O-ring
(2) seating.
a
b
a-Correct ｃ-Twist of O-Ring
b-Incorrect d-Bend of O-Ring
a
a-Correct e-Sliding Surface
b-Incorrect f-Seal Mating Surface
W1-1-2
1
2
c
d
f
b
A
e
2
B
A≠B
A=B
W178-02-11-001
W178-02-11-002
A
B
W178-02-11-003