Maintenance - Textron Greenlee QUICK DRAW 7804SB Manual De Instrucciones

Maintenance

Maintenance and repairs should be performed in a dust
free area by qualified technicians.
This unit requires minimum maintenance because it
has a closed hydraulic system and all internal parts
are lubricated by the hydraulic fluid. Lubricate lever pins
lightly. Keep contaminants away from ram and housing.
Store with lever down and hydraulic pressure released.
Adding Hydraulic Oil
1. Place driver in vise in vertical position with handles
up. Unscrew bladder handle (1) and remove bladder
plug (20). Open release valve knob (27) to assure
the piston is fully extended.
2. Fill rubber bladder to point of overflow with
Greenlee hydraulic oil.
3. Purge air from system:
Pump lever handle several times to remove air from
the pumping chamber. Close release valve knob
and pump lever handle until piston (6) completes its
full travel. Repeat as necessary.
Note: Open release valve knob slowly so piston
extends slowly. Rapid return of oil and
air may cause oil to overflow the rubber
bladder.
If this procedure fails to remove air, remove bladder
plug and open release valve knob. Place thumb
over plug hole in bladder and squeeze bladder
while pumping lever handle several times. Close
the release valve knob and pump the lever handle
until the piston completes its full travel. Repeat
as necessary.
If this procedure does not remove air, remove
plunger (24) and fill plunger cavity with clean oil
as outlined in Reassembly in the maintenance
section of this manual.
4. Fill rubber bladder to the point of overflow and
replace bladder plug. Wipe bladder clean of excess
oil and reassemble bladder handle.
Troubleshooting And Repair
To function properly, the punch driver must be free of oil
leaks and build oil pressure.
Greenlee Textron / Subsidiary of Textron Inc.
7804SB/7806SB Hydraulic Punch Driver
Oil Leaks
Check for external oil leaks.
Check that release valve knob and stem are closed
tightly and seating properly.
Remove bladder handle (1) and check for oil leaks
around rubber bladder (29) and bladder plug (20).
Failure to Build Pressure
Fill with oil and purge air from the system.
See Adding Hydraulic Oil.
Rebuilding
If no leaks are visible and the unit will not build oil
pressure, disassemble and rebuild the punch driver.
Disassembly
1. Remove bladder handle (1), and bladder plug (20);
drain oil from the rubber bladder (29).
2. Remove O-ring retainer (35) and the rubber bladder
(29). Remove retaining rings (21) from one end of
both handle pins (30) and disassemble handle pins
and lever handle (2).
3. Grasp plunger (24) with pliers; pull and twist to
remove. Loosen set screw (12) from release valve
knob (27); remove knob. Unscrew release valve
stem (28) to remove from pump block (5). Ball (32)
is also accessible.
4. Loosen set screw (12) from cylinder (4) and
unscrew cylinder from pump block (5).
5. Remove compression spring (7), retaining plate (22)
and ram coupler (26). Spring (23) and ball (37) can
also be removed.
6. Screw a draw stud into end of piston (6); push the
piston out of the cylinder (4).
7. Remove retaining ring (25) and filter (31). Remove
seat (3) and ball (32). Retaining ring (13) will also
be accessible.
You have now disassembled the punch driver.
Thoroughly clean all parts and inspect the three ball
seats (intake, discharge and release valve stem) for
nicks, scratches, or other damage.
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