H8508 Hydraulic Impact Wrench

INSTRUCTION MANUAL
H8508
HYDRAULIC IMPACT WRENCH
Models 48755FWH/48760FWJ
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.
999 2418.8
© 1997 Greenlee Textron
9/97
H8508 Hydraulic Impact Wrench
Table of Contents
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
48755FWH / 48760FWJ Impact Wrench .......................................... 23 – 27
APPENDICES
Appendix A - SAE J1273 May 1986 ................................................. 28 – 29
Description
The lightweight 48755 Impact Wrench/Drill/Screwdriver comes equipped with a
standard 7/16-inch hex quick- change chuck for use with wood bits, screwdriver
bits, or the provided 1/2-inch drive adaptor. The tool is used to tighten nuts,
install or remove screws (lag, Phillips, slotted, etc.) or used as a wood drill. The
48760 utilizes a standard 1/2-inch square drive. An adjustable torque output
screw varies the torque output of the tool to match the job at hand. 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 48755 and 48760 also comes equipped with a reversing spool,
allowing the wrench to be operated in forward or reverse. The handle is heatinsulated for operator comfort.
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.
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: ________________________
Greenlee Textron / Subsidiary of Textron Inc.
2
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
IMPORTANT SAFETY INSTRUCTIONS
SAFETY
ALERT
SYMBOL
Immediate hazards which, if not avoided, WILL result in
severe personal injury or death.
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 severe personal injury or death.
Hazards or unsafe practices which, if not avoided, COULD
result in minor personal injury or property damage.
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.
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.
Electric shock hazard:
• 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.
This tool is not insulated. When
using this unit near energized
electrical lines, use only certified
non-conductive hoses and proper
personal protective equipment.
• 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.
Failure to observe this warning could
result in severe injury or death.
• 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.
SAVE THESE INSTRUCTIONS
Additional copies of this manual and decals are available upon request at no charge.
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
IMPORTANT SAFETY INSTRUCTIONS
• Use only impact style bits. Bits not designed for
impact applications can break and cause severe
injury.
Do not reverse hydraulic flow. Operation with
hydraulic flow reversed can cause too malfunction. Always connect supply (pressure) hose and
return (tank) hose to proper tools ports.
• Use only sockets approved for impact use. Accessories not designed for impact applications can
break and cause severe injury.
Failure to observe this warning could result in
severe injury or death.
• Inspect drill bits and sockets before use. Discard
damaged bits and sockets. Damaged accessories
can break and cause severe injury.
• Wear protective gloves when handling, removing
and installing drill bits. Drill bits can cut even when
stationary.
Tool and drill bit may be hot during
and after operation. Contact with hot
surfaces can result in serious injury.
• 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.
Skin injection hazard:
High pressure oil easily punctures
skin causing serious injury, gangrene
or death. If injured seek medical
help immediately to remove oil.
• 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 use fingers or hands to
check for leaks.
Depressurize hydraulic system
before servicing.
Procedure for disconnecting tool, removing
hydraulic lines, fittings or components:
Wear eye protection when using
this tool.
1. Stop the power source.
Failure to wear eye protection can
result in serious eye injury from
flying debris or hydraulic oil.
3. Disconnect hydraulic hoses from tool.
Remove lines, fittings or components slowly
to release any trapped pressure.
2. Depressurize the hydraulic system.
Note: Keep all decals clean and legible. Replace
decals when necessary with new decals listed
in the Parts List of this manual.
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.
SAVE THESE INSTRUCTIONS
Additional copies of this manual are available upon request at no charge.
Greenlee Textron / Subsidiary of Textron Inc.
4
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Identification
Figure 1
Model 48755 Shown
6
8
1
4
7
3
2
5
10
11
1.
2.
3.
4.
5.
Serial Number
Trigger
Reversing Spool
Open-Center/Closed-Center Spool & Indicator
Trigger Spool
Greenlee Textron / Subsidiary of Textron Inc.
5
9
6.
7.
8.
9.
10.
11.
Hydraulic Gear Motor
Quick-Change Chuck
Adapter, 1/2"
Pressure Port “P”
Tank Port “T”
Variable Torque Output Screw
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Specifications—Tool
Length ....................................................................................... 8.19 in. (20.8 cm)
Width ......................................................................................... 4.19 in. (10.6 cm)
Height 48755/48760 .............................................................. 11.00 in. (27.9 cm)
Weight
48755 ....................................................................................... 8.0 lbs (3.6 kg)
48760 ....................................................................................... 7.8 lbs (3.5 kg)
RPM Range 48755/48760 ................................................................. 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
48755 .............................. 7/16" Hex Quick-Change Chuck, 1/2" Square Drive
48760 ................................................................................... 1/2" Square Drive
Type of Hydraulic System ..................................... Open-Center or Closed-Center
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
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.
7
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Figure 2
Hydraulic Schematic
FILTER
(10 MICRON)
RESERVOIR
COOLER
RELIEF
VALVE
2000 PSI
T
CONTROL
VALVE
FLOW METER
P
TOOL
PUMP
POWER SOURCE
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.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Hoses and Fittings
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.”
Always stop power source before connecting or
disconnecting tool.
Failure to observe this warning can result in severe
injury death.
Failure to observe this warning could result in
severe injury.
Connecting Hoses (See Figures 1 and 2)
1. Stop the power source.
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.
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.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Operation
Impact Bits
1/2 Inch Socket Drive Adapter and Sockets
(See Figure 1)
Greenlee recommends using Greenlee Impact Style Bits.
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.
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.
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.
Failure to observe this warning can result in
severe injury or death.
UPC No.
78-331037868
37869
37870
37871
37872
37873
37874
37875
37876
37877
Hole Dia. Overall Length
Inch
mm Inch
mm
9/16 14.3 18
457
11/16 17.5 18
457
13/16 20.6 18
457
15/16 23.8 18
457
1-1/16 27.0 18
457
9/16 14.3 22
559
11/16 17.5 22
559
13/16 20.6 22
559
15/16 23.8 22
559
1-1/16 27.0 22
559
Hex Shank
Inch mm
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
7/16 11.1
4. To remove socket drive adapter, remove socket
from adapter. Slide and hold quick-change chuck
(7) away from tool. Remove socket drive adapter.
Weight
lbs. g
0.9 409
1.1 499
1.4 636
1.5 681
1.7 772
1.2 545
1.5 681
1.8 817
2.1 953
2.2 998
Screwdriver Bits (See Figure 1) (Model 48755 only)
1. Inspect Screwdriver Bit to be installed. DISCARD
SCREWDRIVER BIT IF CRACKS, CHIPS OR
GOUGES ARE EVIDENT.
2. Inspect quick-change chuck (7). Remove any dirt or
other contamination that may have accumulated in
the chuck.
3. To insert screwdriver bit, slide and hold quickchange chuck (7) away from tool. Insert desired
screwdriver bit into chuck and release chuck.
1. Inspect the drill bit to be installed. Discard the bit if
cracks, chips or gouges are evident.
4. To remove screwdriver bit, slide and hold quickchange chuck (7) away from tool. Remove screwdriver bit.
2. Inspect the quick change chuck (7). Remove any
dirt or other contamination that may have accumulated in the chuck (7).
Setting Tool for Open-Center or
Closed-Center Operation
3. Slide and hold quick-change chuck (7) away from
tool and remove drive shank (8).
All H8508 models are equipped to allow the tool to be
used with either an Open-Center or Closed-Center
hydraulic power system.
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.
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.
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Operation (cont’d)
Tool and drill bit may be hot during
and after operation. Contact with hot
surfaces can result in serious injury.
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.
Wear eye protection when using
this tool.
Failure to wear eye protection can
result in serious eye injury from
flying debris or hydraulic oil.
• 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 reverse hydraulic flow. Operation with
hydraulic flow reversed can cause too malfunction. Always connect supply (pressure) hose and
return (tank) hose to proper tools ports.
• Do not lock trigger in the power-ON position.
Operator can not stop tool when trigger is locked.
Failure to observe this warning could result in
severe injury or death.
Failure to observe these warnings can result in
severe injury or death.
• Wear protective gloves when handling, removing
and installing drill bits. Drill bits can cut even when
stationary.
• Use only impact style bits. Bits not designed for
impact applications can break and cause severe
injury.
• 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 only sockets approved for impact use. Accessories not designed for impact applications can
break and cause severe injury.
• 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.
• Inspect drill bits and sockets before use. Discard
damaged bits and sockets. Damaged accessories
can break and cause severe injury.
Greenlee Textron / Subsidiary of Textron Inc.
11
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Operation (cont’d)
Pre-Operation (See Figure 1)
Operation (See Figure 1)
1. Stop the power source. Disconnect tool from power
source.
1. Set reversing spool (3) to desired position (forward
or reverse).
2. Set Open-Center/Closed-Center spool (4) to correspond to the power source hydraulic system, that
the tool will be connected to. See Operation - Setting
Tool for Open-Center/Closed-Center Operation.
Note:
3. Slide desired 1/2" square drive socket onto 1/2"
drive on tool (8) or insert desired bit in quick-change
chuck. For model 48755, a screwdriver bit can also
be inserted.
Never shift the reversing spool (3) while the
tool is operating. Always allow the tool to
come to a complete stop before changing
drill direction. Shifting the spool while the
tool is operating may cause internal
tool damage.
2. Grasp the trigger handle. Place your opposite hand
on the top of the tool. This will allow leverage to be
applied while operating.
4. Connect the hydraulic hoses from the power source
to the tool. Start the power source.
3. To start the wrench, squeeze the trigger (2).
Note: Tool will not operate if variable torque output
screw (11) is completely turned in (clockwise).
5. It is recommended that the power source be allowed to run (idle) for a few minutes to warm the
hydraulic reservoir fluid. Actuating the tool intermittently will reduce the time required to warm the
fluid to an efficient operating temperature.
4. To adjust variable torque output to your desired
setting, turn torque output screw (11) counterclockwise to increase torque output or clockwise to
decrease torque output.
5. To stop the wrench, release the trigger (2).
6. After the tool has stopped rotating, lay the wrench
on a flat surface.
7. When the tool is not in use, stop the power source
flow to reduce heat and wear on the tool components.
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Maintenance Schedule
The service life of the tool will be maximized by proper
care and maintenance. The maintenance schedule
below is recommended.
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.
H8508 Impact Wrench
Daily:
1. Wipe all tool surfaces clean of grease, dirt and
foreign material.
2. Inspect the hydraulic system hoses and fittings for
signs of leaks, cracks, wear, or damage. Replace if
necessary.
Note: Keep all decals clean and legible. Replace
decals when necessary with new decals listed
in the Parts List of this manual.
3. To prevent contamination, always install dust caps
over the hydraulic ports when disconnected.
Monthly:
• Perform a detailed inspection of the system hoses
and fittings as stated in Appendix A - S.A.E. Standard
J1273, May 1986. Replace the hoses and/or fittings if
necessary.
Quarterly:
• Remove the hammer case cap, anvil, impact mechanism assembly, spacer, washers and thrust bearing.
Clean the grease from the inside of the handle cavity
and all impact components. Apply a coat of grease
(Mobile Grease HP) to thrust washers (48319), thrust
bearing (48318), hammers (48345), hammer pins
(48346) and anvil (48347) or (48397). Pack the
hammer frame center space before pushing the anvil
into the grease pocket. Reassemble components and
tighten hammer case cap (48516) securely. If wrench
is used under severe operating conditions or hardduty cycle, mechanism may need to be greased more
often.
Semi-Annually:
• Drain the hydraulic system fluid. Flush out the hydraulic system and fill with new, clean fluid. However, if the
fluid turns dark or becomes milky colored, it should be
changed as soon as possible.
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Troubleshooting
Before You Begin
Determining the Problem Area
1. Tool must be connected to the correct power source
system. See Tool Specification for type of hydraulic
system required. Verify the power source hydraulic
system.
1. Stop the power source. Disconnect the existing tool
from the hoses and power source.
2. Connect a known, properly operating tool to the
hoses and power source. See the tool’s operator’s
manual for correct hook-up procedure. Start the
power source.
2. Verify that the pressure and return hoses are
connected properly to the tool and power source
ports.
3. Power source reservoir must be filled to FULL level
with hydraulic fluid.
If the known, properly operating tool operates, the
problem is in the disconnected tool. See the troubleshooting charts in this operator’s manual.
4. Start the power source. All power source shut-off
devices must be engaged or opened (clutch engaged, separate on/off valves open, etc.).
If the known, properly operating tool does not
operate, the problem is likely to be in the hoses or
the power source. Proceed to Step 3.
5. After verifying all of the above, check the tool to see
if it operates.
3. Stop the power source. Disconnect the existing
hoses from the known, properly operating tool and
power source.
If the tool does not operate, it will be necessary to
pinpoint the tool, hoses or power source as the
problem area. The following steps will help to
determine the problem area.
4. Connect a different set of hoses to the known,
properly operating tool and power source. Start the
power source.
If the known, properly operating tool operates with
the different set of hoses, the problem is in the
disconnected hoses.
If the known, properly operating tool does not
operate, the problem is in the power source.
See your power source operator’s manual for
troubleshooting.
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Troubleshooting (cont’d)
PROBLEM
Tool inoperative.
Tool operates erratically.
PROBABLE CAUSE
POSSIBLE REMEDY
Tool connected to improper power
source hydraulic system.
See Tool Specifications for type of
hydraulic system required. Verify
power source hydraulic system.
No hydraulic fluid in system or
fluid level low.
Check fluid level. Fill to FULL mark.
Check system for leaks.
Incorrect hydraulic fluid viscosity.
Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Tool components loose.
Tighten component hardware.
Dirt, contaminants, etc., in tool
components.
Disassemble tool and clean
components.
Tool components worn or damaged.
Disassemble tool. Replace worn or
damaged components.
Hose connections to power source
reversed.
Depressurize hydraulic system.
Reverse hose connections.
Hydraulic fluid cold.
Viscosity of fluid may be too high at
start of tool operation. Allow fluid to
warm to operating temperature.
Actuating tool intermittently will reduce
time required to warm fluid to an
efficient operating temperature.
Air in system.
Check pump suction line for damage
or loose clamps. Tighten clamps or
replace components, if necessary.
Fill reservoir.
Tool components sticking or
binding.
Check for dirt or gummy deposits.
Clean components. Check for worn
or damaged components. Replace
components.
Dirt, contaminants, etc., in tool
components.
Disassemble tool and clean
components.
Greenlee Textron / Subsidiary of Textron Inc.
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4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Troubleshooting (cont’d)
PROBLEM
Tool impacts slowly.
Tool operates too fast.
PROBABLE CAUSE
POSSIBLE REMEDY
Power source components not
adjusted correctly.
Refer to power source operator’s
manual for recommended speed,
flow, and pressure settings.
Hydraulic fluid cold.
Viscosity of fluid may be too high at
start of tool operation. Allow fluid to
warm to operating temperature.
Actuating tool intermittently will reduce
time required to warm fluid to an
efficient operating temperature.
Adjustable torque ouput screw
incorrectly set limiting hydraulic
fluid-flow.
Turn torque output screw counterclockwise to increase flow until
desired output torque is obtained.
Hydraulic fluid level low.
Check fluid level. Fill to FULL mark.
Check system for leaks.
Hydraulic fluid viscosity too heavy.
Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Tool components loose.
Tighten component hardware.
Dirt, contaminants, etc., in tool
components.
Disassemble tool. Clean
components.
Tool components worn or damaged.
Disassemble tool. Replace worn or
damaged components.
Damaged hose couplings.
Inspect couplings. Replace if
damaged.
Flow control cartridge not operating
properly.
Remove and clean cartridge. DO NOT
DISASSEMBLE CARTRIDGE.
Power source components not
adjusted correctly.
Refer to power source operator’s
manual for recommended speed,
flow, and pressure settings.
Tool components sticking or binding.
Check for dirt or gummy deposits.
Clean components. Check for worn
or damaged components. Replace
components.
Flow control cartridge not operating
properly.
Remove and clean cartridge. DO
NOT DISASSEMBLE CARTRIDGE.
Install a new, factory preset cartridge.
Greenlee Textron / Subsidiary of Textron Inc.
16
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Troubleshooting (cont’d)
PROBLEM
Tool feels hot.
PROBABLE CAUSE
POSSIBLE REMEDY
Hydraulic fluid level low.
Check fluid level. Fill to FULL mark.
Check system for leaks.
Hydraulic fluid viscosity too light.
Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Hydraulic fluid dirty.
Drain reservoir, flush and fill with
clean fluid. Change filter.
Tool control valve stuck in partial
power-ON position.
Free valve so it returns to neutral
position.
Power source components not
adjusted correctly.
Refer to power source operator's
manual for recommended speed,
flow, and pressure settings.
Dirt, contaminants, etc., in tool
components.
Disassemble tool. Clean
components.
Worn or damaged O-rings or gaskets.
Replace worn or damaged O-rings
or gaskets.
Tool components worn or damaged.
Disassemble tool. Replace worn or
damaged components.
Greenlee Textron / Subsidiary of Textron Inc.
17
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Troubleshooting (cont’d)
PROBLEM
Tool leaks hydraulic fluid.
Tool trigger plunger sticks or
works hard.
PROBABLE CAUSE
POSSIBLE REMEDY
Tool components loose.
Tighten component hardware.
Worn or damaged O-rings or gaskets.
Replace worn or damaged O-rings
or gaskets.
Tool components worn or damaged.
Disassemble tool. Replace worn or
damaged components.
Check for dirt or gummy deposits.
Clean components.
Trigger binding (trigger bent, trigger
pivot pin too tight, etc.).
Inspect, adjust trigger where binding
occurs.
Power source works, but tool
Inappropriate hydraulic system.
lacks power or does not operate.
Check type of hydraulic power source.
Open-Center or Closed-Center.
Power source works, but tool
lacks power and/or impacts
slowly.
Relief valve setting in tool not correct.
Return tool to factory for service.
Adjustable torque ouput screw
incorrectly set limiting hydraulic
fluid-flow.
Turn torque output screw counterclockwise to increase flow until
desired output torque is obtained.
Flow control cartridge not operating
properly.
Remove and clean cartridge. DO
NOT DISASSEMBLE CARTRIDGE.
Install a new, factory preset cartridge.
Impact mechanism dry. Grease has
been thrown off.
Regrease impact mechanism.
See maintenance schedule.
Incorrect grease or overpacked.
Regrease impact mechanism.
See maintenance schedule.
Heavy duty cycle, heat caused
grease to liquify.
Normal, mechanism may require
grease more often, see maintenance
schedule.
Tool appears to operate
normally but lacks impact
power or does not drill
Grease leaks at anvil
bushing, wrench warm.
Greenlee Textron / Subsidiary of Textron Inc.
18
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Disassembly
Quick-Change Chuck (See Figure 7)
COMPLETE DISASSEMBLY OF THE TOOL IS NOT
RECOMMENDED. RETURN THE TOOL TO YOUR
NEAREST AUTHORIZED GREENLEE FAIRMONT
DISTRIBUTOR OR TO THE FACTORY.
1. Remove adapter (61) from retaining sleeve (50).
2. Press on thrust ring (52) to expose thrust ring lock
(51). Remove thrust ring lock (51) thrust ring (52)
and spring (53). Slide retaining sleeve (50) off anvil
(49) and remove the two steel balls (54).
3. Remove the second thrust ring lock (51) if anvil (49)
needs to be removed from hammer case cap (55).
Note: To prevent the loss of any steel balls, it is
recommended to perform this step over a clean,
empty container to catch any components that
may fall free.
Skin injection hazard:
Oil under pressure easily punctures
skin causing serious injury, gangrene
or death. If injured, seek medical
attention immediately.
Note: If either thrust ring (51) becomes sprung or
out-of-round during disassembly, discard and
replace with a new ring.
Do not use fingers or hands to
check for leaks.
Depressurize hydraulic system
before servicing.
Hammer Case Components
1. Using flats provided on hammer case cap (55),
unscrew cap and remove from tool.
The remaining impact mechanism parts can now be
removed from tool (items 46, 47 & 48).
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.
2. Remove spacer (45), thrust bearing (43) and thrust
washers (44) from hammer case cavity.
Motor (See Figures 6 and 7)
1. Remove socket head cap screws (16) and pull
motor cap (6) from handle (1). Remove gasket (15).
If necessary, remove dowel pins (14).
Procedure for disconnecting tool, removing hydraulic
lines, fittings or components:
2. Pull idler shaft (13) with gear (10) from handle.
Remove gear (10) from idler shaft (13). If necessary, remove drive pin (12) and retaining clip (11)
from idler shaft (13).
1. Stop the power source.
2. Depressurize the hydraulic system.
3. Remove retaining clip (11) gear (10) and Woodruff
key (9) from drive shaft (8). Push drive shaft (8)
toward hammer case cavity and remove from
handle (1).
3. Disconnect hydraulic hoses from tool.
Remove lines, fittings or components slowly to
release any trapped pressure.
The disassembly procedure is divided into sections of
the tool. Complete disassembly of the tool is seldom
necessary. Disassemble only the areas necessary to
correct the problem. See Exploded View and Parts List
for identification of parts as they are removed.
Bearing Replacement
Note: If bearings in motor cap (6) or bearings in handle
(1) are damaged or worn, Greenlee Fairmont
recommends replacing the component as an
assembly with the bearings already pressed in
or return it to Greenlee Fairmont for repair.
Disassembly should be done on a flat, clean surface.
Some parts may fall free during disassembly. To
prevent part loss or damage, keep the tool as close to
the working surface as possible.
Inspect all parts as they are disassembled and mating
parts in the tool that are not removed for signs of
damage, wear, cracks, etc. Replace any parts which
appear to be damaged.
When disassembling tool for service it is recommended
that O-rings, back-up rings and gaskets be replaced.
Greenlee Textron / Subsidiary of Textron Inc.
19
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Disassembly (cont’d)
Assembly
Trigger and Control Spool - 48696
Inspection
1. Motor Cap (6) and Handle (1). Mating surfaces, gear
cavities, oil passageways, etc.; must be smooth and
free of grooves or nicks. If either component has
grooves or nicks, replace the component as an
assembly with the bearings already pressed in.
(See Figures 5 and 7)
1. Remove spring pin (42) from trigger spool (29) by
pressing or tapping with a hammer and punch.
Note: Support trigger (41) so pressing or tapping does
not bend trigger spool (29).
2. Drive Shaft (8), Idler Shaft (13) and Gears (10).
All surfaces, including gear teeth, must be smooth
and free of grooves or nicks. If any component is
damaged, replace the component.
2. Remove washer (39), spring (38), snap ring (37),
and washer (36). Trigger spool (29) may now be
pushed out of handle (1). Push spool toward trigger
side of tool.
3. Bearing (3 & 7). Hold motor cap or handle assembly
in one hand or place on a flat surface. Insert drive
shaft (8) or idler shaft (13) into bearing. Spin the
shaft. The shaft should turn smoothly. If any
roughness is noted, Greenlee Fairmont recommends
replacing the component as an assembly with the
bearings already pressed in.
3. Remove snap ring (33). Open-Center/ClosedCenter spool (31) may now be removed to service
O-ring (34).
4. Ball (32) is loose in this assembly. Take caution to
catch ball when it falls free.
4. Bearing (56) in hammer case cap (55). Slide anvil
(49) into bearing (56). Turn anvil (49). The anvil
should turn smoothly. If any roughness is noted,
check anvil surface. If problem is the bearing
surface, replace hammer case cap assembly as an
assembly with the bearing already pressed in.
Reversing Spool (See Figure 4)
1. Remove reversing spool (19) by loosening and
removing cap (24) on left side of tool and pulling
spool (19) out right side of tool.
Note: For tool orientation (left and right) grip tool as
you would use it and view tool looking at motor
cap (6). See Figure 14.
5. Thrust bearing (43) and thrust washers (44). Turn
bearing on washer surfaces. Bearing should roll
smoothly. If any roughness is felt, replace the
components.
Note: Attempting to push the reversing spool (19)
the opposite way through the bore will cause
damage to O-rings (25 & 26) and could allow
particles of O-ring to get into motor.
6. Trigger Spool (29). All surfaces must be free of
grooves or nicks. If the component has grooves or
nicks, replace the component.
2. Remove plug (22), spring (21) and poppet (20).
7. Reversing Spool (19). All surfaces must be free of
grooves or nicks. If the component has grooves or
nicks, replace the component.
3. Repeat procedure for right side of reversing
spool (19).
Note: If set screws (23 & 60) have not been disturbed
and internal components are returned to the
same side of spool (19), the relief valve setting
may not have been affected and tool will perform
properly when assembled.
8. Flow Control Cartridge (63): All surfaces must be
free of grooves, nicks or cracks. DO NOT DISASSEMBLE FLOW CONTROL CARTRIDGE.
If necessary, replace with a new, factory preset
cartridge.
Note: Relief valve setting may require checking when
tool is reassembled.
9. Adjustable Torque Output Screw (67): All surfaces
and threads must be free of grooves, nicks or
cracks. If any component has grooves, nicks, or
cracks, replace the component.
Flow Control Cartridge (See Figure 7)
10. Hammer Frame (46), Anvil (49), Hammers (47) and
Pins (48). All surfaces must be free of grooves,
1. Remove 11/16 internal retaining ring (66). Pull flow
control cartridge (63) out of handle. Remove
O-rings (64 & 65) from cartridge.
Note: Do not disassemble flow control cartridge.
If necessary, replace with a new, factory preset
cartridge.
Adjustable Torque Output Screw (See Figure 7)
1. Remove spring pin (70) from handle. Turn torque
output screw (67) counterclockwise until threads are
free. Pull screw out of handle. Remove O-ring (68)
and back-up ring (69) from screw.
Greenlee Textron / Subsidiary of Textron Inc.
20
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Figure 3
Torque Sequence
5
Reversing Spool (See Figure 4)
1. Install O-ring (25) onto reversing spool (19). Replace
O-ring (26) in handle (1).
7
1
2. Install O-ring (30) on plug (22). At O-ring end of
spool (19) install poppet (20), spring (21) and plug
(22). Secure assembly with cap (24).
4
3
3. Slide reversing spool assembly into handle (1), as
shown in Figure 11.
2
8
4. Install poppet (20), spring (21) and plug (22) into
opposite end of spool (19). Secure with cap (24).
Use two wrenches on cap (24) and tighten securely.
6
Trigger, Trigger Spool, and Open-Center/ClosedCenter Spool (See Figures 5 and 7)
When assembling parts, refer to Exploded View and
Parts List for correct orientation and placement of parts.
1. Install O-ring (34) on Open-Center/Closed-Center
spool (31). Install ball (32) in trigger spool (29)
cavity. Install Open-Center/Closed-Center spool (31)
into trigger spool (29). Secure with snap-ring (33).
Clean grease and oil from all parts (take care to protect
eyes), then dry thoroughly. Do not expose O-rings or
other packing components to cleaning agent for long
periods of time.
2. Install O-ring (35) onto trigger spool assembly.
Replace O-ring (27) and back-up ring (28) in
handle (1).
Inspect all parts as they are assembled for signs of
damage, wear, cracks, etc. Do not install any parts
which appear to be damaged.
3. Slide trigger spool assembly as shown in Figure 13
into handle (1) from trigger side of tool.
Apply hydraulic fluid or O-ring lubricant to all O-rings
and all metal surfaces which O-rings must slide over.
When installing an O-ring over a sharp edge, use a
rolling action to avoid damage to O-ring.
4. Slide washer (36) onto trigger spool (29) and secure
with snap-ring (37).
Wherever assembled parts cause metal-to-metal contact,
coat the surfaces with hydraulic fluid or O-ring lubricant.
5. Slide spring (38) and washer (39) onto trigger
spool (29).
Motor (See Figures 6 and 7)
6. Secure trigger (41) to trigger spool (29) with spring
pin (42).
7. Secure link (40) to handle (1) and trigger (41) with
spring pins (42).
Note: Support trigger (41) so pressing or tapping on
spring pins (42) does not bend trigger spool (29).
1. Install new O-ring (4) from the motor cap end of the
handle (1) using an O-ring tool. Be careful not to
damage O-ring during installation.
2. Lubricate drive shaft (8) and slide into the opening in
handle (1) through the O-rings and back-up ring from
the impact mechanism side of the tool.
Flow Control Cartridge (See Figure 7)
3. Install woodruff key (9) and one gear (10) onto drive
shaft (8), guiding the keyway in gear (10) over the
Woodruff key (9). Fasten gear to drive shaft with
retaining clip (11).
1.
4. Install drive pin (12) into idler shaft (13), if removed.
Slide remaining gear (10) onto idler shaft (13),
guiding the keyway in gear (10) over drive pin (12).
Install idler shaft and gear into handle (1), meshing
the two gears (10) together. Use retaining clip (11) to
restrain lateral movement of idler shaft.
Install O-rings (64 & 65) on flow control cartridge
(63). Install flow control cartridge in cavity of
handle (1). Secure using 11/16 internal retaining
ring (66).
Adjustable Torque Output Screw (See Figure 7)
1. Install O-ring (68) and back-up ring (69) on torque
output screw (67). Install screw in cavity of handle
(1). Turn screw clockwise until threads are engaged
in threads of handle. Secure screw in handle using
5/64 x 7/8-inch spring pin (70).
5. Install dowel pins (14) into handle (1) if removed.
Install new gasket (15).
6. Install motor cap (6) onto handle (1).
7. Secure motor cap (6) to handle (1) with cap screws
(16). Torque cap screws (16) to 80 in/lbs. Follow
torque sequence shown in Figure 3.
Greenlee Textron / Subsidiary of Textron Inc.
21
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Assembly (cont’d)
Hammer Case Components
Quick-Change Chuck
Note: Use Mobil Grease HP for assembly of impact
mechanism.
1. Slide thrust ring lock (51) over anvil (49) to groove
closest to hammer case cap (55).
1. Apply grease to thrust bearing (43) and work into
needle rollers. Apply light film of grease to thrust
washers (44), stack thrust washers and thrust
bearing properly and place over drive shaft (8).
2. Insert two balls (54) into holes in anvil (49). Slide
retaining sleeve (50) onto anvil (49) “Open” side up.
Insert spring (53) and thrust ring (52) into retaining
sleeve (50). Depress thrust ring (52) and install
thrust ring lock (51) on anvil (49). This will secure
retaining sleeve (50) to anvil (49). Insert drive
shank (61) into chuck.
Note: If either thrust ring (51) becomes sprung or
out-of-round during disassembly, discard and
replace with a new ring.
2. Place spacer (45) over drive shaft (8) with flange
part of spacer up.
Impact Mechanism
1. Before assembly, grease surfaces of hammer frame
(46), hammers (47), hammer pin (48) and anvil (49).
2. Install the two hammers (47) 180° from each other,
into the hammer frame (46). Install the pins (48) into
the hammer frame and through the hammers, then
slide assembly onto spline of drive shaft (8).
3. Pack the hammer frame (46) center space with
grease. Install the anvil (49) into the hammer frame
(46) and through the hammers (47).
4. Install O-ring (62) over threads on hammer case
cap (55).
5. Slide hammer case cap assembly (55 & 56) over
anvil (49) and using flats on cap (55) screw into
handle (1), tighten securely.
Note: Apply lubrication to threads.
Figure 4
Remove Spool This
Direction
20
30
25
60
24
23
22
19
26
21
Install Spool This
Direction
Greenlee Textron / Subsidiary of Textron Inc.
22
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Exploded View
Figure 5
Spool shown in Open-Center Position
35
32
31
33
29
34
Figure 6
18
17
16
59
59
C
58
Greenlee Textron / Subsidiary of Textron Inc.
O
23
57
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Exploded View (cont’d)
Figure 7
15
48
55
46
54
44
51
52
43
45
47
8
5
4
14
3
10
6
51
9
11
12
11
61
53
13
7
10
50
27
56
54
62
49
40
28
33
42
39
41
31
34
38
32
37
36
35
29
63
65
1
64
66
68
69
70
67
Greenlee Textron / Subsidiary of Textron Inc.
24
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Parts List
KEY
UPC NO.
PART NO.
1
DESCRIPTION
QTY.
49269
HANDLE ASSY (includes nos. 3, 4 & 5) ... 1
F016728
Bearing ...................................................... 2
4*
F015305
O-Ring ....................................................... 1
5*
49243
Bearing ...................................................... 1
3
41591
6
7
41591
8
48307
MOTOR CAP............................................. 1
F016728
Bearing ...................................................... 2
49242
Drive Shaft ................................................ 1
9
41592
F016729
Key ............................................................ 1
10
41630
F017105
11-Tooth Gear ........................................... 2
11
41621
F017010
Snap Ring ................................................. 2
12
41593
F016730
Drive Pin .................................................... 1
13
40168
104110K
Idler Shaft .................................................. 1
14
41624
F017014
Dowel Pin .................................................. 2
48363
Gasket ....................................................... 1
41889
F021674
Socket Hd Cap Screw ............................... 8
48328
Eye ............................................................ 1
43701
F021676
Socket Hd Cap Screw ............................... 1
-
48382
REVERSING SPOOL ASSY. .................... 1
19
48361
Reversing Spool ........................................ 1
20
48515
Poppet ....................................................... 2
21
48543
Spring ........................................................ 2
15*
16
17
18
22
48621
Plug ........................................................... 2
23
905 0765.7
Set Screw .................................................. 2
24
48380
Cap ............................................................ 2
60
48622
Set Screw .................................................. 2
F023449
O-Ring ....................................................... 1
25*
42050
26*
48889
48889
O-Ring ....................................................... 1
27*
48539
F011743
O-Ring ....................................................... 1
28*
43312
F021451
Back-up Ring ............................................. 1
48696
Spool-Trigger ............................................ 1
F023379
O-Ring ....................................................... 2
48697
OC/CC Spool ............................................ 1
29
30*
42047
31
43829
F021411
Ball ............................................................ 1
33
32
48540
F021711
Snap Ring ................................................. 1
34*
41331
F010777
O-Ring ....................................................... 1
35*
41491
F015261
O-Ring ....................................................... 1
48310
Washer ...................................................... 1
F017595
Snap Ring ................................................. 1
38
48311
Spring ........................................................ 1
39
48312
Washer ...................................................... 1
40
48313
Link ............................................................ 1
41
48360
Trigger ....................................................... 1
36
37
41648
Greenlee Textron / Subsidiary of Textron Inc.
25
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Parts List (cont’d)
42
48542
F015810
Spring Pin .................................................. 3
43
48318
Thrust Bearing ........................................... 1
44
48319
Thrust Washer ........................................... 2
45
48364
Spacer ....................................................... 1
-
48516
HAMMER CASE CAP ASSY.
55
48320
Hammer Case Cap ................................... 1
56
48517
Bearing ...................................................... 1
158055
Decal - Safety ............................................ 1
58
48512
Decal - Pressure/Flow ............................... 1
59
48513
Decal - Greenlee Textron .......................... 2
41803
F020780
O-Ring ....................................................... 1
UPC NO.
PART NO.
57
62*
43550
For Model 48755 Only
KEY
DESCRIPTION
QTY.
-
48343
IMPACT MECHANISM
46
48344
Hammer Frame ......................................... 1
47
48345
Hammer ..................................................... 2
48
48346
Hammer Pin .............................................. 2
49
48347
Anvil - Quick Change ................................ 1
50
48348
Retaining Sleeve ....................................... 1
51
48349
Thrust Ring Lock ....................................... 2
52
48350
Thrust Ring ................................................ 1
53
48351
Sleeve Spring ............................................ 1
54
48352
Ball ............................................................ 2
41515
F015321
Adapter ...................................................... 1
UPC NO.
PART NO.
61
For Model 48760 Only
KEY
DESCRIPTION
QTY.
-
48398
IMPACT MECHANISM
46
48344
Hammer Frame ......................................... 1
47
48345
Hammer ..................................................... 2
48
48346
Hammer Pin .............................................. 2
49
48397
Anvil - 1/2" Sq. Drive ................................. 1
63
43302
138338
FLOW CONTROL CARTRIDGE ............... 1
64*
41491
F015261
O-Ring, 1/2 x 1/16 - 70 .............................. 1
65*
41627
F017078
O-Ring, 7/16 x 1/16 - 70 ............................ 1
66
41600
F016737
Retaining Ring, 11/16 Internal .................. 1
67
41094
138311
Screw, Adjustable Torque Output ............. 1
68*
42729
L080005
O-Ring, 1/4 x 1/16 - 70 .............................. 1
69*
41843
F021471
Back-up Ring ............................................. 1
70
42053
F023467
Spring Pin, 5/64 x 7/8 ................................ 1
*
Greenlee Textron / Subsidiary of Textron Inc.
48756
Seal Kit
26
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Parts List
1
2
3
4
Optional Accessories
PART NO.
49004
DESCRIPTION
QTY.
Kit—Relief Pressure Check ................................................ 1
Trigger Guard 48518
KEY
UPC NO.
PART NO.
1
2
43701
3
4
41875
DESCRIPTION
QTY.
48518
TRIGGER GUARD GROUP ...................... 1
48399
Bracket ...................................................... 1
F021676
#10-32 x 3/8"
Socket Button Head Cap Screw ............... 2
48327
Trigger Guard ............................................ 1
F021610
#10-32 x 1/2" Button Head Hex Cap Screw .. 2
1/2" Square Drive Impact Socket Set (not shown)
KEY
UPC NO.
PART NO.
DESCRIPTION
QTY.
41769
F020028
1/2 INCH SQUARE DRIVE
IMPACT SOCKET SET ............................. 1
41535
F015424
Impact Socket, 5/8 .................................... 1
41536
F015426
Impact Socket, 3/4 .................................... 1
41537
F015427
Impact Socket, 13/16 ................................ 1
41538
F015428
Impact Socket, 7/8 .................................... 1
41539
F015430
Impact Socket, 1 ....................................... 1
41540
F015431
Impact Socket, 1-1/16 ............................... 1
41515
F015321
Adapter, Adapts Quick Change Chuck
to 1/2" Square Drive .................................. 1
1/2" Square Socket x 5/8" Hex Socket Adapter (not shown)
KEY
UPC NO.
PART NO.
41515
F020538
DESCRIPTION
QTY.
Adapter,
1/2 Square Socket x 5/8 Hex Socket. ....... 1
Screwdriver Bits (not shown)
Note: For screwdriver applications, purchase Apex or equivalent 7/16 inch
hex power drives for the following applicable screw head types:
Phillips, Slotted, Torex, Pozidriv, Sel-O-Fit, Frearson, Socket Head, Torq-Set
Greenlee Textron / Subsidiary of Textron Inc.
27
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Appendix A
SELECTION, INSTALLATION AND MAINTENANCE
OF HOSE AND HOSE ASSEMBLIES
2.5 Size - Transmission of power by means of pressurized fluid varies with pressure and rate of flow. The size
of the components must be adequate to keep pressure
losses to a minimum and avoid damage to the hose due
to heat generation or excessive turbulence.
- SAE J1273 MAY 1986*
SAE RECOMMENDED PRACTICE
2.6 Routing - Attention must be given to optimum
routing to minimize inherent problems.
The following recommendations on selection, installation and maintenance of hose and hose assemblies was
established by the S.A.E. in 1979 and reaffirmed May
1986. Please read these general instructions carefully.
2.7 Environment - Care must be taken to insure that the
hose and fittings are either compatible with or protected
from the environment to which they are exposed.
Environmental conditions such as ultraviolet light,
ozone, salt water, chemicals, and air pollutants can
cause degradation and premature failure and, therefore,
must be considered.
1. SCOPE
Hose (also includes hose assemblies) has a finite life and
there are a number of factors which will reduce its life.
This recommended practice is intended as a guide to
assist system designers and/or users in the selection,
installation, and maintenance of hose. The designers
and users must make a systematic review of each
application and then select, install, and maintain the
hose to fulfill the requirements of the application. The
following are general guidelines and are not necessarily
a complete list.
2.8 Mechanical Loads - External forces can significantly
reduce hose life. Mechanical loads which must be
considered include excessive flexing, twist, kinking,
tensile or side loads, bend radius, and vibration. Use of
swivel type fittings or adapters may be required to
insure no twist is put in the hose. Unusual applications
may require special testing prior to hose selection.
2.9 Abrasion - While a hose is designed with a reasonable level of abrasion resistance, care must be taken to
protect the hose from excessive abrasion which can
result in erosion, snagging and cutting of the hose
cover. Exposure of the reinforcement will significantly
accelerate hose failure.
Improper selection, installation or maintenance
may result in premature failures, bodily injury, or
property damage.
2.10 Proper End Fitting - Care must be taken to insure
proper compatibility exists between the hose and
coupling selected based on the manufacturer’s recommendations substantiated by testing to industry standards such as SAE J517d (November, 1976).
2. SELECTION
The following is a list of factors which must be considered before final hose selection can be made.
2.11 Length - When establishing proper hose length,
motion absorption, hose length changes due to pressure, as well as hose and machine tolerances must be
considered.
2.1 Pressure - After determining the system pressure,
hose selection must be made so that the recommended
maximum operating pressure is equal to or greater than
the system pressure. Surge pressures higher than the
maximum operating pressure will shorten hose life and
must be taken into account by the hydraulic designer.
2.12 Specifications and Standards - When selecting
hose, government, industry, and manufacturer’s specifications and recommendations must be reviewed and
applicable.
2.2 Suction - Hoses used for suction applications must
be selected to insure the hose will withstand the negative pressure of the system.
2.13 Hose Cleanliness - Hose components vary in
cleanliness levels. Care must be taken to insure that the
assemblies selected have an adequate level of cleanliness for the application.
2.3 Temperature - Care must be taken to insure that
fluid and ambient temperatures, both static and transient, do not exceed the limitations of the hose. Special
care must be taken when routing near hot manifolds.
2.14 Electrical Conductivity - Certain applications
require that the hose be non-conductive to prevent
electrical current flow. Other applications require the
hose to be sufficiently conductive to drain off static
electricity. Hose and fittings must be chosen with these
needs in mind.
2.4 Fluid Compatibility - Hose selection must assure
compatibility of the hose tube, cover, and fittings with
fluid used. Additional caution must be observed in hose
selection for gaseous applications.
Greenlee Textron / Subsidiary of Textron Inc.
28
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
H8508 Hydraulic Impact Wrench
Appendix A (cont’d)
3. INSTALLATION
4. MAINTENANCE
After selection of proper hose, the following factors must
be considered by the installer.
Even with proper selection and installation, hose life
may be significantly reduced without a continuing
maintenance program. Frequency should be determined
by the severity of the application and risk potential.
3.1 Pre-Installation Inspection - Prior to installation, a
careful examination of the hose must be performed. All
components must be checked for correct style, size,
and length. In addition, the hose must be examined for
cleanliness, I.D. obstructions, blisters, loose cover, or
any other visual defects.
A maintenance program should include the following as
a minimum.
4.1 Hose Storage - Hose products in storage can be
affected adversely by temperature, humidity, ozone,
sunlight, oils, solvents, corrosive liquids and fumes,
insects, rodents and radioactive material. Storage areas
should be relatively cool and dark, and free of dust, dirt,
dampness and mildew.
3.2 Follow Manufacturers’ Assembly Instructions.
3.3 Minimum Bend Radius - Installation at less than
minimum bend radius may significantly reduce hose life.
Particular attention must be given to preclude sharp
bending at the hose/fitting juncture.
4.2 Visual Inspection - Any of the following conditions
requires replacement of the hose:
3.4 Twist Angle and Orientation - Hose installations
must be such that relative motion of machine components produces bending of the hose rather than twisting.
(a) Leaks at fitting or in hose. (Leaking fluid is a fire
hazard).
3.5 Securement - In many applications, it may be
necessary to restrain, protect, or guide the hose to
protect it from damage by unnecessary flexing, pressure
surges, and contact with other mechanical components.
Care must be taken to insure such restraints do not
produce additional stress or wear points.
(b) Damaged, cut or abraded cover. (Any reinforcement
exposed).
3.6 Proper Condition of Ports - Proper physical installation of the hose requires a correctly installed port
connection while insuring that no twist or torque is put
into the hose.
(f) Cracked, damaged, or badly corroded fittings.
(c) Kinked, crushed, flattened or twisted hose.
(d) Hard, stiff, heat cracked or charred hose.
(e) Blistered, soft degraded or loose cover.
(g) Fitting Slippage on hose.
4.3 Visual Inspection - The following items must be
tightened, repaired, or replaced as required:
3.7 Avoid External Damage - Proper installation is not
complete without insuring tensile loads, side loads,
kinking, flattening, potential abrasion, thread damage, or
damage to sealing surfaces are corrected or eliminated.
(a) Leaking port conditions.
(b) Clamps, guards, shields.
(c) Remove excessive dirt buildup.
3.8 System Check Out - After completing the installation, all air entrapment must be eliminated and the
system pressurized to the maximum system pressure
and checked for proper function and freedom from leaks.
Note: Avoid potential hazardous area while testing.
(d) System fluid level, fluid type, and any air entrapment.
4.4 Functional Test - Operate the system at maximum
operating pressure and check for possible malfunctions
and freedom from leaks.
Note: Avoid potential hazardous areas while testing.
4.5 Replacement Intervals - Specific replacement
intervals must be considered based on previous service
life, government or industry recommendations, or when
failures could result in unacceptable down time,
damage, or injury risk.
*Reprinted with permission© 1990 from the Society of
Automotive Engineers, Inc. Handbook.
Greenlee Textron / Subsidiary of Textron Inc.
29
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
Greenlee Textron / Subsidiary of Textron Inc.
4455 Boeing Drive, Rockford, IL 61109-2988 USA
General Offices: 815/397-7070
Customer Center and Field Service: 800/435-0786
Fax (24 Hour) Customer Center: 800/451-2632 • 815/397-1865
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Printed in the U.S.A.
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