Troubleshooting - Greenlee Quick Draw 7804SB Service Manual

Troubleshooting

Problem
Does not punch hole.
Requires excessive lever
force.
Pump does not build
pressure.
Excessive number of strokes
are required to punch hole.
Does not return piston.
External oil leaks.
Greenlee Textron / Subsidiary of Textron Inc.
®
Quick Draw Hydraulic Punch Drivers
Probable Cause
Improper assembly or use of punch,
die, or accessories.
Low oil level.
Improper assembly or use of punch,
die, or accessories.
Material being punched is too thick or
too hard.
Air in system.
Inoperative intake check valve.
Inoperative discharge check valve.
Leaking release valve.
Damaged piston, piston extension,
pump plunger seals, or mating
surfaces.
Clogged filter.
Weak or damaged return spring;
excess oil in unit.
Damaged piston, piston extension,
pump plunger seals, or mating
surfaces.
Damaged release valve stem seal.
Refer to "Operation" and "Capacity and Draw
Stud Selection Guide."
Refer to "Adding Hydraulic Oil" in the
"Maintenance" section.
Refer to "Operation" and "Capacity and Draw
Stud Selection Guide."
Refer to "Capacity and Draw Stud Selection
Guide."
Refer to step 3 of "Adding Hydraulic Oil" in
the "Maintenance" section.
Refer to "Intake Check Valve" inspection in
the "Inspection and Adjustments" section.
Refer to "Discharge Check Valve" inspection
in the "Inspection and Adjustments" section.
Refer to "Release Valve" inspection in the
"Inspection and Adjustments" section.
Refer to "Maintenance," cylinder and pump
block sections.
Clean or replace filter (31).
Refer to "Ram Travel Inspection" in the
"Inspection and Adjustments" section.
Refer to "Maintenance," cylinder and pump
block sections.
Refer to "Release Valve" inspection in the
"Inspection and Adjustments" section.
5
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815/397-7070
Probable Remedy