Textron Greenlee QUICK DRAW 7804SB Manual De Instrucciones página 11

Maintenance (cont'd)
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
servicing this tool.
Failure to wear eye protection can
result in serious eye injury from
flying debris or hydraulic oil.
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
Greenlee Textron / Subsidiary of Textron Inc.
7804SB/7806SB Hydraulic Punch Driver
DISCHARGE
CHECK
5/32" REAM
9/64" REAM
INTAKE
CHECK
Reassembly
Reassembly is done in reverse sequence of disassembly.
1. Use repair kit 503 7161.4 to replace all O-ring seals,
balls and springs.
2. Inspect drilled oil passage in piston (6); be sure this
passage is not blocked.
3. Before reinserting piston (6) in cylinder (4), lightly
coat O-ring seals and bores of the cylinder with
clean hydraulic oil.
4. Coat discharge check spring (23) with petroleum gel
and insert it into the counter bore of the ram coupler
(26).
5. Fill plunger bore in pump block (5) with clean oil.
Then coat plunger O-ring seals with clean oil, and
reinsert in the pump block with release valve knob
(27) closed.
6. Fill unit with clean oil and purge air per Adding
Hydraulic Oil in the Maintenance section of this
manual.
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