Handle Sub-Assembly; Pulling Heads - Cherry GH-702A Maintenance Manual

HANDLE SUB-ASSEMBLY


Disconnect tool from air supply and remove parts (25) through (29).

Remove the head sub-assembly using the instructions in the head sub-assembly section.

Place piston rod wrench (700A61) down into the top of the handle (32), into the hex socket in the head of the power piston
rod (37). While holding this wrench, remove the locknut (24) using the 7/16" socket in packing plug wrench (700B65).

Still holding the piston rod wrench, remove the air piston (22) using the packing plug wrench (700B65) by turning
counterclockwise. When air piston (22) is completely freed from the piston rod, tap or push on the piston rod wrench to eject
the piston from bottom of handle.

Slide power piston rod (37) back up to the end of its travel. Using the packing plug wrench (700B65), remove
packing plug (19). It may be necessary to hold the handle upside down in a vise while removing the packing plug.

Power cylinder (33) can be tapped out by lowering power cylinder tool (700A62) down into the top of the handle on to top of
cylinder. The 0-rings (16) and backup rings (17) are best removed and replaced by using a thin bent hook.
To re-assemble the handle, reverse the above procedure, being certain that all the 0-rings are properly lubricated before installa-
tion. Attach the seal guide (700A60) to the piston rod (37) and with a mallet, tap the piston rod through the packing plug (19).
When re-assembling a replacement air piston, items (20) through (23), follow the instructions given below:
 Clamp piston rod wrench (700A61) in a vise with the hex shaft pointed up.
 Turn the handle upside down and place the hex end of the power piston rod (37) onto the wrench. Push handle casting down
until it stops.
 Assemble 0-ring (20) to air piston (22).
 Place large washer (21) over the threaded end of the power piston rod (37).
 Place the air piston (22) into handle bore. IMPORTANT: Be sure that the radial pattern embossed on the side of air piston
is facing downward towards the large washer (21) and the smooth side of the air piston is facing you.
 Place the small washer (23) over the threaded end of the power piston rod (37). Thread the locknut (24) onto the power
piston rod (37) and tighten between 50 in.-lb (5.65 N-m) and 59 in.-lb (6.67 N-m).
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