YAMADA DP-20F/P, Maintenance Manual

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9
6.2 Inspection
▪ Spool [Fig.6.10]
Measure the outside diameter, and if it is not within the
permissible range, replace the spool.
Permissible range of spool diameter
DP-F/P Ø 15.73 - Ø 15.80 mm
DP-F/C Ø 15.77 - Ø 15.80 mm
▪ Sleeve [Fig.6.11]
Measure the inside diameter, and if it is not within the
permissible range, replace the sleeve. If the sleeve is cracked
or damaged, replace it, too.
Permissible range of sleeve diameter
DP-F/P
Ø 15.80 - Ø 15.86 mm
DP-F/C Ø 15.80 - Ø 15.82 mm
▪ O rings
Replace the O ring if it is worn out or cracked.
<NOTE>
▪ Be sure to replace the spool and sleeve together as a
complete set.
(Set No : DP-20F/P 804395
DP-25,38F/P 804396
DP-25,38F/C 804170)
▪ C spring [Fig.6.12]
Measure the dimension shown on the left figure, and if it is
not within the permissible range, replace the C spring.
Permissible range of C spring dimension
DP-20F/P 25.9 - 26.5 mm
DP-25F/P, DP-25F/C
DP-38F/P, DP-38F/C
29.4 - 30.0 mm
▪ Interlocking bush [Fig.6.13]
Measure the dimensions shown on the left figure, and if it is
not within the permissible range, replace the interlocking
bush with a new one.
Usable range of Interlocking bush dimension
Part to
measure “a”
DP-20F/P 4.8 - 5.0 mm
DP-25F/P, DP-25F/C
DP-38F/P, DP-38F/C
5.5 - 5.7 mm
Part to
measure “b”
DP-20F/P 6.8 - 7.1 mm
DP-25F/P, DP-25F/C
DP-38F/P, DP-38F/C
7.3 - 7.6 mm
▪ Arm [Fig.6.14]
Measure the dimension shown on the left figure, and if it
is not within the permissible range, replace the arm.
Permissible range of arm dimension
DP-20F/P 10.5 - 10.9 mm
DP-25F/P, DP-25F/C
DP-38F/P, DP-38F/C
12.2 - 12.6 mm
▪ Spring bearing
Replace the spring bearing if it is worn out or damaged.
▪ Cushion
Replace the cushion if it is worn out or damaged.
Fig.6.10
Fig.6.11
Fig.6.12
Fig.6.13
Fig.6.14