Fill And Bleed Instructions; Trouble Shooting - Cherry G704B Instruction Manual

F I L L A N D B L E E D I N S T R U C T I O N S
To replace a small amount of fluid in the tool, remove cap screw (14), attach the Cherry air bleeder (700A77), connect the tool to the air
line and cycle several times. This will ensure the removal of any air from the hydraulic system and its replacement with fluid.
Should it become necessary to completely refill the tool (such as would be required after the tool has been dismantled and reassem-
bled), take the following steps:
DO NOT depress trigger while disconnecting the air bleeder and replacing the cap screw (14).
T R O U B L E S H O O T I N G
1. Check the airline for correct pressure at the tool. It must be
90 to 110 psi (6.2 to 7.6 bar).
2. Check the tool for lack of fluid (see Fill and Bleed
instructions).
3. Check for oil leakage:
 Fluid leaking around the cap screw (14) in the head
indicates that the screw is loose or the Stat-O-Seal (13)
needs replacing.
 If fluid should leak through the by-pass hole at the base
of the handle (30) the O-rings (32) are worn or
damaged.
 Fluid leaking from the front of the head (1) indicates
that O-rings (2) are worn or damaged.
4. Check for excessive air leakage from the air valve:

If spring (38) is broken or dislodged, air will
bleed directly through the bottom of the air valve and
the head piston retreats to its full stroke without
returning. See air valve instructions on page 5.

If O-ring (43) on plug (44) is worn or damaged,
replace.

If O-rings (39) on spool valve (40) are worn
or damaged, replace.
1. Remove head assembly (1) from handle (30) by
unscrewing cap screws (49).
2. Fill handle assembly (30) with the recommended oil to
within 1/8" (3.175mm) of the top of the handle casting.
3. Place head assembly (1) on handle (30), being sure
gasket (48), and O-ring (47), are properly in place.
Tighten cap screws (49) uniformly to prevent leakage
around gasket.
4. Attach the Cherry air bleeder (700A77). Connect the tool
to the air line and cycle a number of times. This will ensure
the removal of any air from its hydraulic system and its
replacement with fluid.
 Check movement of the head piston (4). If it does not
move freely or is slow in operation:
 O-rings (2), (5) and (7) may be damaged and require
replacement.
 Head piston (4) may be mechanically locked due to
damaged parts.
 The O-ring (34) on power piston (35) may be
damaged; replace.
 Muffler (45) or air filter (41) inside valve spool (40) may be
plugged with dirt. Clean them thoroughly with normal solvent
and back-blow with compressed air.
 Hole in metering screw (42) in valve spool (40) may be
blocked or damaged. Hole diameter should be .028"
(.7112 mm). Clear and size or replace valve spool
assembly (52).
5. Rivet stem sticks in the pulling head:
 Pulling head components need maintenance. Disassemble
the pulling head, clean and replace worn parts.
Reassemble as per the instructions given in pulling head
tool sheets.
 Spent rivet stems are wedged side by side in the head
piston (4). Disassemble the pulling head, remove stems and
reassemble by the instructions given in pulling head tool
sheets.
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