Greenlee H8508 48330FWE User manual

999 2417.0 © 1997 Greenlee Textron 9/97
INSTRUCTION MANUAL
Read and understand this material before operating
or servicing this equipment. Failure to understand how
to safely operate this tool could result in an accident
causing serious injury or death.
H8508
HYDRAULIC IMPACT WRENCH
Models 48330FWE/48329FWF

Greenlee Textron / Subsidiary of Textron Inc. 2
H8508 Hydraulic ImpactWrench
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
OPERATION
Safety Information.................................................................................3 – 4
Description ..................................................................................................2
Identification ................................................................................................5
Specifications - Tool....................................................................................6
Specifications - Hydraulic Power Source....................................................7
Recommended Hydraulic Fluids .................................................................8
Hoses and Fittings ......................................................................................9
Hose Connections.......................................................................................9
Operation ..................................................................................................10
MAINTENANCE
Maintenance Schedule .............................................................................13
SERVICE
Troubleshooting ................................................................................14 – 18
Disassembly......................................................................................19 – 20
Assembly...........................................................................................20 – 22
PARTS
48330FWE / 48329FWF Impact Wrench..........................................23 – 27
APPENDICES
Appendix A - SAE J1273 May 1986 .................................................28 – 29
Table of Contents
Additional or replacement manuals may be obtained from your Greenlee
Fairmont dealer. When tool is received, complete the following record:
SERIAL NUMBER: ____________________________
DATE OF PURCHASE:_________________________
WHERE PURCHASED: ________________________
Purpose
This instruction manual is intended to familiarize operators and maintenance
personnel with the safe operation and maintenance procedures for the H8508
Hydraulic Impact Wrench.
Description
The lightweight 48330 Impact Wrench comes equipped with a standard 7/16-inch
hex quick-change chuck for use with wood bits, or adapts to 1/2-inch square
drive for use with sockets. The 48329 utilizes a standard 1/2 inch square drive.
These tools are used to tighten nuts, install lag screws, or as a wood drill in
most any utility or construction application. The trigger spool design contains
a center spool which can be rotated to allow the impact wrench to be used
with either an Open-Center or Closed-Center hydraulic system. The 48330
and 48329 also come equipped with a reversing spool, allowing the wrench
to be operated in forward or reverse. The handle is heat-insulated for operator
comfort and safety.

Greenlee Textron / Subsidiary of Textron Inc. 34455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic ImpactWrench
Safety is a critical factor in the design of Greenlee equipment. The best program starts with a safety-conscious
operator. The information highlighted in this bulletin describes operating practices for the benefit of the workers
who will use our equipment in their daily jobs. Comments from users are appreciated.
The symbol above is used to call your attention
to instructions concerning your personal safety.
Watch for this symbol. It points out important safety
precautions. It means “ATTENTION! Become alert!
Your personal safety is involved!” Read the
message that follows and be alert to the possibility
of personal injury or death.
Hazards or unsafe practices which, if not avoided, COULD
result in minor personal injury or property damage.
Hazards or unsafe practices which, if not avoided,
COULD result in severe personal injury or death.
Immediate hazards which, if not avoided, WILL result in
severe personal injury or death.
SAFETY
ALERT
SYMBOL
A person who has not read and does not understand all
operating instructions is not qualified to operate this tool.
Failure to read and understand safety instructions may result
in injury or death.
IMPORTANT SAFETY INSTRUCTIONS
SAVETHESE INSTRUCTIONS
Additional copies of this manual and decals are available upon request at no charge.
Electric shock hazard:
This tool is not insulated. When
using this unit near energized
electrical lines, use only certified
non-conductive hoses and proper
personal protective equipment.
Failure to observe this warning could
result in severe injury or death.
• Keep all parts of the body away from rotating parts
when the tool is in operation. Contact with moving
parts can result in severe injury.
• Do not change accessories, inspect, adjust or
clean tool when it is connected to a power source.
Accidental start-up can result in serious injury.
• Maintain a firm grip on tool, using both hands at all
times. Serious injury can result if an operator does
not control the tool.
• Do not lock trigger in the power-ON position.
Operator can not stop tool when trigger is locked.
Failure to observe these warnings can result in
severe injury or death.

Greenlee Textron / Subsidiary of Textron Inc. 4
H8508 Hydraulic ImpactWrench
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
SAVETHESE INSTRUCTIONS
Additional copies of this manual are available upon request at no charge.
IMPORTANT SAFETY INSTRUCTIONS
• Use only impact style bits. Bits not designed for
impact applications can break and cause severe
injury.
• Use only sockets approved for impact use. Acces-
sories not designed for impact applications can
break and cause severe injury.
• Inspect drill bits and sockets before use. Discard
damaged bits and sockets. Damaged accessories
can break and cause severe injury.
Tool and drill bit may be hot during
and after operation. Contact with hot
surfaces can result in serious injury.
Skin injection hazard:
High pressure oil easily punctures
skin causing serious injury, gangrene
or death. If injured seek medical
help immediately to remove oil.
Do not use fingers or hands to
check for leaks.
Depressurize hydraulic system
before servicing.
Wear eye protection when using
this tool.
Failure to wear eye protection can
result in serious eye injury from
flying debris or hydraulic oil.
Do not disconnect tool, hoses or fittings while
the power unit is running or if the hydraulic fluid
is hot. Exposure to hot hydraulic fluid can cause
serious burns.
• Wear protective gloves when handling, removing
and installing drill bits. Drill bits can cut even when
stationary.
• Inspect hydraulic hoses and couplings every
operating day. Repair or replace if leakage,
cracking, wear or damage is evident. Damaged
hoses or couplings can fail resulting in injury or
property damage.
• Use this tool for manufacturer’s intended purpose
only. Use other than that which is described in this
manual can result in injury or property damage.
• Make sure all bystanders are clear of the work
area when handling, starting and operating the
tool. Nearby personnel can be injured by flying or
falling debris or by flying parts in the event of a
tool malfunction.
Do not reverse hydraulic flow. Operation with
hydraulic flow reversed can cause too malfunc-
tion. Always connect supply (pressure) hose and
return (tank) hose to proper tools ports.
Failure to observe this warning could result in
severe injury or death.
Procedure for disconnecting tool, removing
hydraulic lines, fittings or components:
1. Stop the power source.
2. Depressurize the hydraulic system.
3. Disconnect hydraulic hoses from tool.
Remove lines, fittings or components slowly
to release any trapped pressure.
Note: Keep all decals clean and legible. Replace
decals when necessary with new decals listed
in the Parts List of this manual.

Greenlee Textron / Subsidiary of Textron Inc. 54455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic ImpactWrench
Identification
Figure 1
Model 48330 Shown
1. Serial Number 6. Hydraulic Gear Motor
2. Trigger 7. Quick-Change Chuck
3. Reversing Spool 8. Adapter, 1/2"
4. Open-Center/Closed-Center Spool & Indicator 9. Pressure Port “P”
5. Trigger Spool 10. Tank Port “T”
3
7
2
5
9
10
4
1
6
8

Greenlee Textron / Subsidiary of Textron Inc. 6
H8508 Hydraulic ImpactWrench
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
Specifications—Tool
Length ....................................................................................... 8.19 in. (20.8 cm)
Width......................................................................................... 4.19 in. (10.6 cm)
Height 48330/48329 .............................................................. 10.56 in. (26.8 cm)
Weight
48330.......................................................................................7.1 lbs (3.2 kg)
48329.......................................................................................6.9 lbs (3.1 kg)
RPM Range 48330/48329 ................................................................. 4400 - 9700
Output Torque............................................................400 foot-pounds (188 Kglm)
Tool - Pressure Port..........................................................3/4 16 UNF SAE O-ring
Tool - Return Port .............................................................3/4 16 UNF SAE O-ring
Drive Size
48330................................ 7/16" Hex quick-change chuck, 1/2" Square Drive
48329................................................................................... 1/2" Square Drive
Type of Hydraulic System..................................... Open-Center or Closed-Center

Greenlee Textron / Subsidiary of Textron Inc. 74455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic ImpactWrench
Specifications—Hydraulic Power Source
• Power source flow must not exceed 12 gpm (45.41 lpm).
• Limit relief pressure to 2000 psi (137.9 bar).
Failure to observe these warnings could result in overpressurizing the
system, resulting in severe injury to operator or bystanders.
Any hydraulic power source used with this tool must meet the following requirements:
Flow
Minimum ................................................................................4 gpm (15.1 lpm)
Recommended ...................................................... 5 - 8 gpm (18.9 - 30.3 lpm)
Maximum .............................................................................12 gpm (45.4 lpm)
Operating Pressure
Minimum .............................................................................1000 psi (96.6 bar)
Maximum ..........................................................................2000 psi (137.9 bar)
Pressure Relief Setting ...........................................................2000 psi (137.9 bar)
Back Pressure
Maximum*.............................................................................200 psi (13.8 bar)
Filtration ................................................................................. 10 Micron (Nominal)
Type of Hydraulic System ......................................Open-Center or Closed-Center
* 200 psi is the maximum agreed standard back pressure for the Hydraulic
Tool Manufacturers Association (HTMA). Greenlee Fairmont tools will
operate satisfactorily at this standard.
1. Maximum fluid temperature must not exceed 140°F (60°C) at the maximum
expected ambient temperature. A sufficient oil cooling capacity is needed to
limit the fluid temperature.
2. Maximum flow must not exceed 12 gpm (45.4 lpm). Install a flow meter in
the return line to test the rate of flow in the system before working the tool.
3. Pressure relief valve must not exceed 2000 psi (137.9 bar) @ 10 gpm
(37.8 lpm). The pressure relief valve must be located in the supply circuit
between the pump and tool to limit pressure to the tool.
Figure 2 shows a typical hydraulic power source being used with the tool.

Greenlee Textron / Subsidiary of Textron Inc. 8
H8508 Hydraulic ImpactWrench
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
FILTER
(10 MICRON)
COOLER
RELIEF
VALVE
2000 PSI
CONTROL
VALVE FLOW METER
T
PTOOL
RESERVOIR
PUMP
POWER SOURCE
Figure 2
Hydraulic Schematic
Recommended Hydraulic Fluids
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.
Any non-detergent hydraulic fluid which meets the following specifications or
HTMA specifications may be used.
S.U.S. @ 100°F (38°C)..........................................................................140 to 225
@ 210°F (99°C)............................................................................ 40 minimum
Flash Point .......................................................................340°F (170°C) minimum
Pour Point ......................................................................... -30°F (-34°C) minimum

Greenlee Textron / Subsidiary of Textron Inc. 94455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic ImpactWrench
Hose Connections
Hoses and fittings used with this tool must comply
with SAE Standard J1273 (See Appendix A)
recommended practice for “Selection, Installation
and Maintenance of Hose and Hose Assemblies.”
Failure to observe this warning could result in
severe injury.
Hoses and Fittings
Hose assemblies and quick-connect couplers are
available from Greenlee Fairmont as accessories.
SEE BULLETIN ON GREENLEE FAIRMONT NO-DRIP
COUPLERS AND HOSES. CONTACT AUTHORIZED
GREENLEE FAIRMONT DISTRIBUTOR.
Always stop power source before connecting or
disconnecting tool.
Failure to observe this warning can result in severe
injury death.
Connecting Hoses (See Figures 1 and 2)
1. Stop the power source.
2. Connect the return (tank) hose from the power
source (port T) to the tool (T port).
Note: Return (tank) hose connection should
always be connected before supply
(pressure) hose connection to prevent
pressure build-up inside the tool.
3. Connect the supply (pressure) hose from the
power source (port P) to the tool (P port).
Disconnecting Hoses (See Figures 1 and 2)
1. Stop the power source.
2. Disconnect the supply (pressure) hose from the
power source (port P) to the tool (P port).
Note: Supply (pressure) hose connection should
always be disconnected before return
(tank) hose connection to prevent pressure
build-up inside the tool.
3. Disconnect the return (tank) hose from the
power source (port T) to the tool (T port).
4. To prevent contamination, always install dust
caps over the hydraulic ports of the tool when
disconnected.

Greenlee Textron / Subsidiary of Textron Inc. 10
H8508 Hydraulic ImpactWrench
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
Operation
1/2 Inch Socket Drive Adapter and Sockets
(See Figure 1)
1. Inspect quick-change chuck (7). Remove any dirt or
other contamination that may have accumulated in
the chuck.
2. To insert 1/2 inch socket drive adapter, slide and
hold quick-change chuck (7) away from tool. Insert
socket drive adapter into chuck and release chuck.
3. USE SOCKETS APPROVED FOR IMPACT
WRENCH USE ONLY. Inspect 1/2 inch drive socket
to be installed. DISCARD SOCKET IF CRACKS,
CHIPS OR GOUGES ARE EVIDENT. Install socket
on socket drive adapter.
4. To remove socket drive adapter, remove socket
from adapter. Slide and hold quick-change chuck
(7) away from tool. Remove socket drive adapter.
Setting Tool for Open-Center or
Closed-Center Operation
All H8508 models are equipped to allow the tool to be
used with either an Open-Center or Closed-Center
hydraulic power system.
Closed-Center Hydraulic System
Hold the tool as you would when operating, observe
rear of trigger spool, turn center spool in trigger spool
(Figure 1, Item 4) clockwise until spool stops. The tool is
now ready for Closed-Center operation.
Open-Center Hydraulic System
Hold the tool as you would when operating, observe
rear of trigger spool (Fig. 1, Item 4), turn center spool in
trigger spool counterclockwise until spool backs out to
snap-ring. The tool is now ready for Open-Center
operation.
Impact Bits
Greenlee recommends using Greenlee Impact Style Bits.
Some impact bits with a long spiral or wide flute
spacing may not be acceptable to use with this
tool. These bits can whip or bend under sideload.
Do not use bits exhibiting these characteristics
with the H8508 Impact Wrench.
Failure to observe this warning can result in
severe injury or death.
UPC No. Hole Dia. Overall Length Hex Shank Weight
78-3310- Inch mm Inch mm Inch mm lbs. g
37868 9/16 14.3 18 457 7/16 11.1 0.9 409
37869 11/16 17.5 18 457 7/16 11.1 1.1 499
37870 13/16 20.6 18 457 7/16 11.1 1.4 636
37871 15/16 23.8 18 457 7/16 11.1 1.5 681
37872 1-1/16 27.0 18 457 7/16 11.1 1.7 772
37873 9/16 14.3 22 559 7/16 11.1 1.2 545
37874 11/16 17.5 22 559 7/16 11.1 1.5 681
37875 13/16 20.6 22 559 7/16 11.1 1.8 817
37876 15/16 23.8 22 559 7/16 11.1 2.1 953
37877 1-1/16 27.0 22 559 7/16 11.1 2.2 998
1. Inspect the drill bit to be installed. Discard the bit if
cracks, chips or gouges are evident.
2. Inspect the quick change chuck (7). Remove any
dirt or other contamination that may have accumu-
lated in the chuck (7).
3. Slide and hold quick-change chuck (7) away from
tool and remove drive shank (8).
4. Insert desired bit into hex socket of tool and release
chuck (7).
5. To remove drill bit, slide and hold quick-change
chuck (7) away from tool and remove bit.