Hitachi EX550-5, Руководство по ремонту

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GENERAL INFORMATION / Precautions for Disassembling and Assembling
W1-1-3
Precautions for Handling Floating Seal
1. In general, replace the floating seal with a new
one after disassembling.
If the floating is to be reused, follow these proce-
dures:
(1) Keep seal rings together as a matched set
with seal ring faces together. Insert a piece of
card-board to protect surfaces.
(2) Check slide surface (C) on seal ring (A) for
scuffing, scoring, corrosion, deformation or
uneven wear.
(3) Check O-ring (B) for tears, breaks, deforma-
tion or hardening.
2. If incorrectly assembled, oil leaks or damage will
occur. Be sure to do the following, to prevent trou-
ble.
(1) Clean the floating seal and seal mounting
bores with cleaning solvent.
Use a wire brush to remove mud, rust or dirt.
After cleaning, thoroughly dry parts with com-
pressed air.
(2) Clean the floating seal and seal mounting
bores. Check the bore surface for scuffing or
scoring by touching the surface with finger.
(3) Check that the O-ring is not twisted, and that it
is installed correctly on the seal ring.
(4) After installing the floating seal, check that
seal surface (C) is parallel with idler face (D)
by measuring the distances (a) and (b) as il-
lustrated. If these distances differ, correct the
O-ring seating.
W105-03-05-019
W105-03-05-020
W110-03-05-004
Incorrectly
Correctly
Incorrect
b b
a a
a
≠
b a=b
Correct
A
B
D
C
B