Maintenance - Greenlee Quick Draw 90 7906SB Instruction Manual

Maintenance (cont'd)
Reassembly—Pump Section
Fill plunger (24) bore with clean hydraulic oil. Coat
O-ring seals on plunger with clean oil and reinsert
the pump block (2) with release valve knob (27) closed.
Reassembly—Ram to Pump
1. Apply clean hydraulic oil to the O-ring (14) groove
on the 1/2" diameter "stem" of the cylinder, and the
mating bore of pump block.
2. Apply a light coat of grease (Molycote G) to the
external threads of cylinder (1) and both ends of the
compression spring (41). Position the pump block
with the threaded end up and place the compres-
sion spring (41) into the pump block recess.
3. Insert the cylinder stem into mating bore of pump
block, compress the spring (41), and thread the
pump block onto the cylinder.
4. Apply Loctite 242 or equivalent to set screw (13)
and install until set screw bottoms. Back out the
set screw 1/8 to 1/4 turn.
5. Fill unit with clean oil and purge air. See Adding
Hydraulic Oil.
Inspection and Adjustments
After reassembly, check the following:
Ram Travel Inspection
Ram Extended
With the draw stud removed and release valve knob
open, observe whether end of ram (3) is flush to 1/64"
(.396 mm) below the end of cylinder (1). If it is not, the
bladder (29) contains too much oil.
To remove excess oil:
1. Remove reservoir handle (21) and bladder plug
(20).
2. Slowly open release valve knob (27); excess oil
should come out of the bladder and the ram should
move to become flush to 1/64" (.396 mm) below the
end of the cylinder (1).
3 If excess oil does not come out, replace the
compression spring (7).
Greenlee Textron / Subsidiary of Textron Inc.
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7904SB/7906SB Hydraulic Punch Driver
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Ram Retracted
Measure ram travel distance (difference between
ram completely extended and completely retracted).
Rotate spring retainer (4) until travel distance is .830"
(21.1 mm) to .930" (23.6 mm). Tighten set screw (12).
(23.6 mm)
(21.1 mm)
.930"
RAM
.830"
TRAVEL
33967
ADAPTER
Pump Section Inspection
Intake Check Valve
Close the release valve knob and operate handle (22)
until ram (3) bottoms and handle resistance increases.
• If the ram bottoms in 30 strokes or less, the intake
check valve is operating properly.
• More than 30 strokes indicates an intake check leak.
Re-seat, re-drill or replace the copper washer (40),
and compression spring (31).
Discharge Check Valve
If the handle (22) returns to the raised position
by itself, the discharge check valve is leaking. Re-seat
or re-drill the discharge check seat and replace the
compression spring (39).
Release Valve
Pump the handle until the ram bottoms. Gently apply
and maintain additional force on handle (22). If the
handle remains solid, the ball (32) is operating properly.
If the handle (22) goes down slowly, the release valve is
leaking. Re-seat or re-drill the release stem seat and
replace O-ring (33).
Cylinder Rotation
Install a 3/4" draw stud and a 2" conduit size punch and
die to the punch driver. Hold the driver by the reservoir
handle (21) so the draw stud is horizontal; the cylinder
should not rotate from the combined weight of the draw
stud, the punch and the die. Replace compression
spring (31).
If binding or roughness occurs during cylinder rotation,
check for lubrication or damage at threads closest to set
screw (13); also check adjustment of set screw (13).
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
12
.com
ROTATE SPRING RETAINER
TO MAKE ADJUSTMENT
SET SCREW
(12)
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