Hitachi ZX 870-5G, Руководство по ремонту

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Group 1 Precautions for Disassembling and Assembling
SECTION 1 GENERAL
W1-1-1-2
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.
1
2
a
b
c
d
a - Correct
b - Incorrect c - Twist of O-Ring
d - Bend of O-Ring
a - Correct
b - Incorrect e - Sliding Surface
f - Seal Mating Surface
f
e
2
a
A
A
B
B
b
A=B A≠B
W178-02-11-001
W178-02-11-002
W178-02-11-003