H8508 Series Impact Wrenches
Greenlee / A Textron Company
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
11
Problem
Probable Cause
Probable Remedy
Tool does not
operate.
Improper power source.
Refer to “Specifications.” Verify that the power
source meets the specifications.
Hydraulic fluid level low.
Check the fluid level. Check system for leaks.
Incorrect hydraulic fluid viscosity.
Refer to “Recommended Hydraulic Fluids” in the
“Specifications” section.
Hose connections at tool reversed.
Depressurize hydraulic system. Switch the hose
connections.
Variable torque output screw turned
too far clockwise, completely stopping
the flow of hydraulic fluid.
Turn variable torque output screw counterclockwise
to achieve the necessary amount of torque.
Tool operates
slowly or
erratically.
Hydraulic fluid cold.
Allow fluid to warm to the operating temperature.
Actuate the tool intermittently to reduce the warming
time.
Power source not adjusted correctly.
Refer to the power source operator’s manual for
setting the flow and pressure. Set the flow and pres-
sure to correspond with the tool.
Air in the hydraulic system.
Refer to the power source manufacturer’s instruc-
tions for removing air from the system.
Incorrect hydraulic fluid viscosity.
Refer to “Recommended Hydraulic Fluids” in the
“Specifications” section.
Variable torque output screw incor
-
rectly set, limiting hydraulic fluid flow.
Turn variable torque output screw counterclockwise
to increase the flow until desired output is obtained.
Flow control cartridge not operating
properly.
Remove and clean cartridge. Do not disassemble
cartridge. Install a new, factory preset cartridge.
Tool feels hot.
Hydraulic fluid level low.
Check the fluid level. Check system for leaks.
Incorrect hydraulic fluid viscosity.
Refer to “Recommended Hydraulic Fluids” in the
“Specifications” section.
Hydraulic fluid dirty.
Drain reservoir, flush, and fill with clean fluid.
Change filter.
Before troubleshooting, determine whether the problem
is in the tool, the hoses, or the power source. Substitute
a tool, hoses, or power source known to be in good
working order to identify the item that is not operating.
Troubleshooting
If the problem is in the tool, see the troubleshoot-
ing table below. If the problem is in the power source,
see the troubleshooting section of the power source
instruction manual.
