Greenlee TZ Serie Manuel D'instructions page 13

Troubleshooting—Hydraulic Pump (cont'd)
Problem
Ram will not hold pressure.
Ram will not retract.
Greenlee Tools, Inc.
Probable Cause
System has an external leak.
Manual control valve needs
adjustment or repair.
The manual control valve is not in
correct position.
The manual control valve needs to
be adjusted.
Check ball does not seat properly.
The manual control valve is not in
correct position.
The manual control valve needs to
be adjusted.
Quick-couplers are not fully
threaded together.
Manual control valve set incorrectly.
The pilot-operated valve will not
open, will not open fully, or opens
too slowly.
Hydraulic cylinder of the accessory
has failed.
13
975 Hydraulic Power Pump
Probable Remedy
Visually inspect hoses, connectors
and fittings for leaking hydraulic
fluid. Replace faulty components.
See Hydraulic Schematic (8) and
refer to Figures A2 and A3 in the
Repairs section of this manual
Rotate the manual control valve to
AUTO RELEASE position.
See Manual Release/Automatic
Release Valve Handle Setting, Figure
A3 in the Repairs section of this
manual.
See Manual Release/Automatic
Release Valve Handle Setting, Figure
A2, and Ball Seat Refinishing, Figure
B4 in the Repairs section of this
manual.
Rotate the manual control valve to
AUTO RELEASE position.
Adjust the handle. See Manual
Release/Automatic Release Valve
Handle Setting, Figure A3 in the
Repairs section of this manual.
Disconnect the hydraulic hoses and
clean the couplings. Reconnect
the hydraulic hoses. Hand-tighten
couplings firmly until all threads are
engaged. Do not use a wrench.
See Hydraulic Schematic (8) and
refer to Figures A2 and A3 in the
Repairs section of this manual.
See "Troubleshooting—Pilot-
Operated Valve" at the end of this
Troubleshooting section.
Troubleshoot the accessory that is
connected to the pump.
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