Ball Seat Repair; Reassembly - Greenlee 767 Instruction Manual

Ball Seat Repair

Reseating:
Minor seat imperfections may be corrected by reseat-
ing. Use a soft brass rod and hammer to tap the ball
against its seat.
Wear safety glasses when striking the
brass rod.
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 seats (10):
Use an "F" drill and a 7/32" diameter reamer
• To re-drill the 1/4" ball seat (11):
Use a "Q" drill and a 13/64" diameter reamer
When drilling; remove a minimum of material to obtain
maximum seat life. Reseat the balls before reassembly.
"Q" DRILL
STD. DRILL
ACCEPTABLE
"F" DRILL
RELEASE
VALVE
STEM
Greenlee / A Textron Company
DISCHARGE
CHECK
13/64" REAM
7/32" REAM
5
767 Hydraulic Hand Pump

Reassembly

Reassembly is done in reverse sequence of disassembly.
Use repair kit 50034349 to replace all O-ring seals, balls
and springs.
Before installing O-rings, lightly coat O-ring seals and
bores of the cylinder with clean hydraulic oil.
Coat the discharge check spring (5) with a petroleum gel
before installation.
Fill unit with clean oil and purge air per instructions under
the Filling the Pump with Oil section of this manual.
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