H8508 Hydraulic Impact Wrench
Greenlee / A Textron Company
6
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Specifications
Impact Wrench
Type of Hydraulic System ........................ Open-center or
closed-center
Hydraulic Ports
Pressure ............................... 3/4–16 UNF SAE O-ring
Return ................................... 3/4–16 UNF SAE O-ring
Mass/Weight
48330 .................................................... 3.2 kg (7.1 lb)
48329 .................................................... 3.1 kg (6.9 lb)
Length ..................................................... 208 mm (8.19")
Width ....................................................... 106 mm (4.19")
Height .................................................... 268 mm (10.56")
RPM Range ................................................... 4400–9700
Output Torque .................................... 542 Nm (400 ft-lb)
Drive Size
48330 .......................... 7/16" hex quick-change chuck,
1/2" square drive
48329 ............................................... 1/2" square drive
Hydraulic Power Source
Type of Hydraulic System ........................ Open-center or
closed-center
Flow
Minimum ........................................ 15.1 l/min (4 gpm)
Recommended ................. 18.9–30.3 l/min (5–8 gpm)
Maximum ..................................... 37.9 l/min (10 gpm)
Operating Pressure
Minimum ....................................... 96.6 bar (1000 psi)
Maximum ....................................... 138 bar (2000 psi)
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 standard
back pressure for the HTMA (Hydraulic Tool Manufac-
turers Association). Fairmont tools will operate satis-
factorily at this standard.
Figure 2
Hydraulic Schematic
Use any non-detergent, 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
Do not exceed the following hydraulic power source
maximums:
• Hydraulic flow: 37.9 l/min (10 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.
FILTER
(10 micron)
COOLER
RELIEF
VALVE
138 bar
(2000 psi)
CONTROL
VALVE
FLOW METER
T
P
TOOL
RESERVOIR
PUMP
POWER SOURCE
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 37.9 l/min (10 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 the tool’s maximum flow. Locate
the pressure relief valve in the supply circuit to limit
excessive hydraulic pressure to the tool.
Hydraulic Power Source (cont’d)
Electric shock hazard:
When using this unit near energized
electrical lines, select and maintain
the hydraulic fluid to meet the
minimum dielectric standards
required by your safety department.
Failure to observe this warning could
result in severe injury or death.
Recommended Hydraulic Fluids
