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20 ► CR27 User Manual
TROUBLESHOOTING
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem. When
diagnosing faults in operation of the saw, always make sure the hydraulic power source is supplying the correct
hydraulic ow and pressure to the saw as listed in the table. Use a owmeter know to be accurate. Check the ow
with the hydraulic uid temperature at least 80 °F/27 °C.
PROBLEM CAUSE REMEDY
Tool will not operate. Hydraulic system not engaged or
running.
Engage or start hydraulic system.
Hydraulic system control valve is
OFF.
Turn the system control valve ON.
Tool not connected to the hydraulic
system.
Connect tool to the system.
Trigger and valve spool stick. Damaged trigger guard. Have repaired by an authorized
Stanley Hydraulic Tools dealer.
High back pressure. Determine cause of high back
pressure and return line and
remove restriction.
Tool reverse plumbed to the
system.
Correctly connect the pressure and
return lines.
Valve spool or spool bore scored by
contaminated hydraulic uid.
Have repaired by an authorized
Stanley Hydraulic Tools dealer.
Saw cuts poorly. Blade is dull. Replace with sharp blade.
Saw is running backwards. Check direction of rotation. Correct
rotation is counterclockwise as
viewed from the motor side of the
saw blades.
Blade installed backwards. Install the blade correctly. Blade
teeth point in direction of rotation,
counterclockwise as viewed from
the motor side of the saw blades.
Saw slows excessively under load. System relief valve set too low. Check system relief and adjust
relief valve to crack open at 2100
psi.
Tool motor worn. Have inspected and repaired by an
authorized Stanley Hydraulic Tools
dealer.
Hydraulic oil leaks from motor shaft. Motor shaft seal worn or failed. Have inspected and repaired by an
authorized Stanley Hydraulic Tools
dealer.
Hydraulic oil leaks between valve
handle and outer tube handle.
Oil tube seals worn or oil tubes
worn.
Have inspected and repaired by an
authorized Stanley Hydraulic Tools
dealer.