Reassembly; Inspection And Adjustments; 7704Sb / 7706Sb; 7804Sb / 7806Sb - Greenlee Quick Draw 7804SB Service Manual

Reassembly

Reassembly is done in reverse sequence of
disassembly.
1. Use one of the following repair kits to replace all
O-ring seals, balls, and springs:
• 7704SB / 7706SB: Repair kit 501 0477.2
• 7804SB / 7806SB: Repair kit 503 7161.4
2. Inspect drilled oil passage in ram (6); be sure this
passage is not blocked.
3. Before reinserting ram (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. Refer to "Adding
Hydraulic Oil" in the "Maintenance" section of this
manual.
Greenlee Textron / Subsidiary of Textron Inc.
®
Quick Draw Hydraulic Punch Drivers

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 (6) is flush to 1/64"
(0.396 mm) below the end of cylinder (4). If it is not, the
rubber bladder (29) contains too much oil.
To remove excess oil:
1. Remove reservoir handle (1) and bladder plug (20).
2. Slowly open release valve knob (27); excess oil
should come out of the rubber bladder and the ram
should move to become flush to 1/64" (0.396 mm)
below the end of cylinder (4).
3. If excess oil does not come out, replace the
compression spring (7).
Ram Retracted
Measure ram travel distance (difference between ram
completely extended and completely retracted). Adjust
cylinder (4) so travel distance is 0.830" (21.1 mm) to
0.930" (23.6 mm). Tighten set screw (12).
(23.6 mm)
(21.1 mm)
.930"
.830"
33967
Adapter
Pump Section Inspection
Intake Check Valve
Close the release valve knob and operate lever
handle (2) until ram (6) 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 intake check seat.
Discharge Check Valve
If the lever handle (2) 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 discharge compression spring (23).
Release Valve
Pump the handle until the ram bottoms. Gently apply
and maintain additional force on lever handle (2). If the
lever handle remains solid, the release valve ball (32) is
operating properly. If the lever handle (2) goes down
slowly, the release valve is leaking. Re-seat or re-drill
the release valve stem seat and replace O-ring (33).
7
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815/397-7070
Rotate cylinder
to make adjustment.
Piston
Travel
Set Screw
(12)