Disassembly; Ball Seat Repair - Greenlee Quick Draw 7804SB Service Manual

Disassembly

1. Remove reservoir 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 ram (6); push the ram
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.
Greenlee Textron / Subsidiary of Textron Inc.
®
Quick Draw Hydraulic Punch Drivers

Ball Seat Repair

Re-seating
Minor seat imperfections may be corrected by
re-seating. Use a soft brass rod and hammer to tap
the ball against its seat.
Wear eye protection when operating
or servicing this tool.
Failure to wear eye protection can
result in serious eye injury from
flying debris.
Re-drilling
Badly worn or damaged seats may be reworked by
re-drilling and then re-seating.
The pump block is manufactured with seats of 118°,
the standard drill point angle. Use standard drills for
re-drilling.
• To re-drill the 3/16" ball seat for release valve stem
(28): Use an "I" drill and a 9/64" diameter reamer.
• To re-drill the 7/32" ball seat for the discharge check:
Use an "I" drill and a 5/32" diameter reamer.
• To re-drill the 3/16" ball seat for the intake check:
Use a 1/4" drill and a 1/8" diameter reamer.
When drilling, remove a minimum of material to obtain
maximum seat life. Re-seat the balls before reassembly.
"I" Drill
Std. Drill
Acceptable
"I" Drill
Release
Valve
Stem
"B" Drill
9/64" Ream
6
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815/397-7070
Discharge
Check
5/32" Ream
9/64" Ream
Intake
Check