Textron Greenlee QUICK DRAW 7804SB Manual De Instrucciones página 12

Maintenance (cont'd)
Inspection and Adjustments
After reassembly, check the following:
Piston Travel Inspection
Piston Extended
With the draw stud removed and release valve knob
open, observe whether end of piston (6) is flush to 1/64"
(.396 mm) below the end of cylinder (4). If it is not, the
rubber bladder (29) contains too much oil.
To remove excess oil:
• Remove bladder handle (1) and bladder plug (20).
• Slowly open release valve knob (27); excess oil
should come out of the rubber bladder and piston
move to become flush to 1/64" (.396 mm) below
the end of cylinder (4).
• If excess oil does not come out, replace the
compression spring (7).
Piston Retracted
Measure piston travel distance (difference between
piston completely extended and completely retracted).
Adjust cylinder (4) so travel distance is .830" (21.1 mm)
to .930" (23.6 mm). Tighten set screw (12).
(23.6 mm)
(21.1 mm)
.930"
PISTON
.830"
TRAVEL
33967
ADAPTER
Greenlee Textron / Subsidiary of Textron Inc.
7804SB/7806SB Hydraulic Punch Driver
ROTATE CYLINDER
TO MAKE ADJUSTMENT
SET SCREW
KEY 12
Pump Section Inspection
Intake Check Valve
Close the release valve knob and operate lever
handle (2) until piston (6) bottoms and handle
resistance increases.
If the piston 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, this indicates a discharge check valve leak.
Re-seat or re-drill the discharge check seat and replace
the discharge compression spring (23).
Release Valve
Pump the lever until the piston 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, this indicates leakage at the release valve.
Re-seat or re-drill the release valve stem seat and
replace O-ring (33).
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