6
OVERHAUL
The disassembly and re-assembly proce-
dures
can
be
accomplished
by
following the instructions below and the
drawings on pages 8 & 10.
Use extreme
care during disassembly
and
re-
assembly not to mar, nick or burr
any smooth surface that comes in
contact with O-rings.
Before installing
O-rings, be sure to apply an O-ring
lubricant. It is recommended that special
assembly tools, which can be ordered
under part number
G701/G704KT,
be
used to overhaul this tool. Service kit,
G747KS,
which contains a complete set
of
O-rings,
back-up
rings,
screws,
washers and gaskets should be ordered.
Not shown, but included:
701A67 Seal
Guide, 702B62 Power Cylinder Tool,
703A53 Seal Guide, 702A64 Seal Guide.
AIR VALVE
Remove retaining ring (47) and muffler (46). Insert a valve plug extractor (P1178) into end of valve plug (45) and pull it out.
Using the same procedures, pull out valve spool sub-assembly (40).
Use needle nose pliers to grasp the end of the spring (39), turn clockwise and pull out to dislodge from groove in handle.
With spring removed, valve sleeve (38) can be pulled out using the valve sleeve removal tool (837B700).
To re-assemble, reverse the above procedures, being certain that all O-rings are properly lubricated. To avoid damaging the
O-rings (37), carefully install sleeve (38) with your finger. Gently push and wiggle sleeve to allow O-rings to slip past inner ports.
Spring (39) is best installed using a valve spring installation tool (836B700) to push the large diameter coil into the groove. This
requires care as the tool will not operate if the spring is not anchored firmly.
HEAD SUB-ASSEMBLY
Disconnect the air supply and remove the complete pulling head from the tool before attempting to disassemble the
head assembly.
Remove the four socket head cap screws (50). Lift head assembly from the handle (31). Remove O-ring (48) and gasket
(49). Empty the oil into a container by pouring from the handle. Dispose of the oil according to environmental regulations.
Remove end cap (9). Push against threaded end of head piston (4) and slide it out of head cylinder (1). Be careful not to
damage threads or cause burrs on polished head piston rod surface.
O-rings (2) and back-up ring (3) can now be removed using a bent hook. O-ring (7) can be removed in the same manner.
Upon re-assembly, be sure to install O-rings and back-up rings carefully to avoid cutting them. Always lubricate all O-rings.
Just prior to placing the head sub-assembly onto the handle, see Fill and Bleed Instructions. Also make sure to place O-ring
(51) on top of the handle in its groove, and then the gasket (49) over the O-ring (48).
Tighten the four socket head cap screws (50) uniformly to prevent leakage around the gasket.
Purge system of air using Cherry air bleeder (700A77) according to Fill & Bleed Instructions.
G701/G704KT TOOL KIT
Содержание 747-002
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Страница 11: ...10 EXPLODED VIEW OF G747...
