H4905A Hydraulic Sign Post Puller
Greenlee / A Textron Company
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
7
Specifications
Sign Post Puller
Type of Hydraulic System: Open-center
Hydraulic Ports:
Pressure (supply): 9/16–18 SAE O-ring boss
Tank (return): 3/4–16 SAE O-ring boss
Lifting Force: 43.6 kN (9800 lb)
Stroke: 127 mm (5")
Sound Power Level: 32 L
wa
Mass/Weight: 32 kg (70 lb)
Height: 660 mm (26")
Width: 254 mm (10")
Length: 267 mm (10.5")
Hydraulic Power Source
Do not exceed the following hydraulic power source
maximums:
Hydraulic flow: 22.7 l/min (6 gpm)
•
Pressure relief: 138 bar (2000 psi)
•
Back pressure: 13.8 bar (200 psi)
•
Failure to observe this warning could result in severe
injury or death.
Type of Hydraulic System: Open-center
Flow:
Minimum: 15.1 l/min (4 gpm)
Recommended: 18.9 l/min (5 gpm)
Maximum: 22.7 l/min (6 gpm)
Filtration: 10 micron (nominal)
Pressure Relief Setting: 138 bar (2000 psi)
Back Pressure (maximum*): 13.8 bar (200 psi)
* 13.8 bar (200 psi) is the maximum agreed stan-
dard back pressure for the HTMA (Hydraulic Tool
Manufacturers Association). Greenlee Utility tools
will operate satisfactorily at this standard.
1. Maximum hydraulic fluid temperature must not
exceed 60 °C (140 °F). A sufficient oil cooling
capacity is needed to limit the hydraulic fluid
temperature.
2. Hydraulic flow must not exceed 22.7 l/min (6 gpm).
Install a flow meter in the return line to measure the
rate of hydraulic flow before using the tool.
3. Pressure relief valve setting must not exceed
138 bar (2000 psi) at your tool’s maximum flow.
Locate the pressure relief valve in the supply circuit
to limit excessive hydraulic pressure to the tool.
Hydraulic Schematic
FILTER
(10 micron)
COOLER
RELIEF
VALVE
138 bar
(2000 psi)
CONTROL
VALVE
FLOW METER
T
P
TOOL
RESERVOIR
PUMP
POWER SOURCE
Recommended Hydraulic Fluids
Use any nondetergent, petroleum-based hydraulic
fluid which meets the following specifications or HTMA
specifications.
S.U.S. @:
38 °C (100 °F): 140 to 225
99 °C (210 °F): 40 minimum
Flash Point: 170 °C (340 °F) minimum
Pour Point: –34 °C (–30 °F) minimum
