Hardinge SUPER-PRECISION HC - Page 17

Figure 48 - Air and Ele c tri ca l Connections for Knockout Control
Figure 49 - Knockout Co nt rol
10. To r emove micro s wit ch mount " X" , Fi gur e 52:
(a) Remove two set screws "Y" and remove
stop collars "Z " and "A " from trip screw.
DO NOT MISPLACE BRASS PLUGS under
sc rews " Y ".
(b) Re move four screws " B" , Fig ur e 53, and
remove mount for micro swi tch es.
(c) Remove ret a ining ring "C", Figure 54.
Push trip screw "D" down inside mount
and remov e reta ining ring "F". Loosen set
screw "G", remove trip screw " D ", cam
" H" a nd springs "J".
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11. To remove guide bar and knockout piston :
(a) Remove set screw " A", Figure 55. Remove
adjusting co llar " B" . DO NOT MISPLACE
BRASS PLUG under set screw "A".
(b) Use face spanner wrench to remove nut
'' C'' .
(c) Remove spring " D" , Fi gure 56, and remove
nut " E ", Figure 57.
(ct) Remove piston shaft "F " , Figure 58.
(e) If necessary , l oosen two screws " G" and
drive out pin " H" to remove guide bar "J " .
(f) Remove piston plate " K", Figure 59 , O-r i ng
" L", p iston-ring "M ", seal " N" and O- ring
(g) Remove O-ring " P ", Figure 60, if neces-
sary .
12. To remove roller clamp piston:
(a) Use fac e spanner wrench to remove nut
" Q" , Figure 55. Remove spring " R ", Figu re
61 .
(b) Remove nut "S " , Figure 62.
(c) Loosen set screw " T ", Figure 61, and drive
ou t dowel pin "U " from opposite si de
shown . Remove piston shaft, Figure 63 .
(d) If necessary , loosen set screw " V" and
drive ou t dowel pin " W" to separate pis t on
sha ft " X" and bracket " Y ". Cam follower
"Z" is removed w i th a standard screw
driver .
( e) Re move piston plate " A ", Figure 64, O-r ing
" B" , pi ston ring " C ", seal " D" and O-ring
" E ".
(f) Re move O-ring " F ", Figure 65 , if neces-
sary .
CHASING KNOCKOUT REASSEMBLY
NOTE : Lubricate O-rings , seals and cylinder walls
with Mobil Velocite No . 6 or equivalent during reas-
sembly .
1. To replace roller clamp piston :
(a) Replac e O-ring "F ", F igure 65.
(b) Replace cam follower "Z", Figure 63.
Replace dowel pin " W" through b racke t
" Y" and piston shaft "X". Tighten set
screw " V" .
(c) Replace piston shaft , Figure 63. Repl ace
dowel pin " U ", Figure 61 , and tighten set
screw "T " .
(d) R eplace O-ring "E ", Figure 64 , in seal " D" .
Replace O-ring and seal on piston ring
"C" and replace piston ring " C ". NOTE:
Use nut " Q", Figure 55, to start these parts
in cylinder wall liner.
(e) Replace O- ring " B" , Figure 64, piston
plate " A" and nut " S" , Fig ure 62 .
(f) Replace spring "R'', Figure 61, and nut
" Q" Figure 55.