PR41 User Manual ◄ 15
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 tool, always make sure the hydraulic power source is supplying the cor-
rect hydraulic ow and pressure 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 SOLUTION
Tool will not operate. Hydraulic system not engaged or
running.
Engage or start hydraulic system.
Hydraulic system control valve 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 authorized dealer.
High back pressure. Determine cause of high back pressure
in 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 authorized dealer.
Pruner cuts poorly. Blade is dull. Replace with sharp blade.
Pruner is running backwards. Check direction of blade cut. Correct
direction is for blade to cut when
squeezing the trigger. Blade should
be retracted when not squeezing the
trigger.
System relief valve set too low. Check system relief and adjust relief
valve to crack open at 2100 psi.
Piston seal leaks or piston or cylinder
is damaged.
Have inspected and repaired by
authorized dealer.
Hydraulic oil leaks between
valve handle and outer tube
handle.
Seals worn or piston rod worn. Have repaired by authorized dealer.
TROUBLESHOOTING
