Cherry Aerospace G-689, Оригинальное руководство пользователя

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THE G685KT TOOL KIT
5
OVERHAUL
The disassembly and re-assembly procedures
can be accomplished by following the
instructions and the drawings on pages
11 and 13. 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 such
as Lubriplate® 630-A. It is recommended that
special assembly tools, which can be ordered
under part number G685KT, be used to
overhaul this tool. Service kit, G689KS, which
contains a complete set of O-rings, back-up
rings, screws, washers and gaskets should be
ordered. The 680A159 setting gage is included
with the G689 tool.
AIR VALVE SUB-ASSEMBLY
•
To disassemble, first disconnect tool from its air source.
•
Remove retaining ring (81) and muffler (80). Insert a valve plug extractor (P-1178) or a 5/16-18 threaded rod or
bolt into end of valve plug (79) and pull it out. Using the same procedures, pull out valve spool sub-
assembly (93).
•
Muffler (80) inside valve spool sub-assembly (93) may be plugged with dirt. Clean it thoroughly with normal
solvent and back-blow with compressed air.
NOTE: It should never be necessary to remove valve sleeve (72) unless the ports in the sleeve have become
plugged from contaminated air. The O-rings on this sleeve are static and therefore do not wear.
•
If it is suspected that the ports are plugged, use needle nose pliers to grasp end of spring (73), turn clockwise
and pull to dislodge from groove in handle.
•
With spring removed, the valve sleeve (72) can be pulled out using the valve sleeve removal tool (837B530).
To re-assemble, reverse the above procedures being certain that all O-rings are properly lubricated. To avoid damaging
the O-rings, carefully install sleeve (72) with your fingers. Gently push and wiggle sleeve to allow O-rings to slip past
inner ports. Spring (73) is best installed using a valve spring installation tool (836B530) to push the large diameter coil
into the groove. This requires care as the G689 will not operate if this spring (73) is not anchored firmly.
HEAD SUB-ASSEMBLY
•
Always remove the complete pulling head from the tool before attempting to disassemble the head assembly.
Disconnect tool from air source.
•
Remove the five socket head cap screws (89) and socket head cap screw (90). Lift head assembly from the
handle (61). Remove O-rings (40), adapter (86), O-ring (87) and gasket (88). Empty the oil into a container by
pouring from the handle.
•
Remove cap screws (39) and Stat-O-Seals (38), and drain the hydraulic system. Dispose of the oil according to
environmental regulations.