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 tool, always make sure the hydraulic power source is supplying the cor- rect hydraulic flow and pressure as listed in the table. Use a flowmeter know to be accurate. Check the flow with the hydraulic fluid temperature at least 80 °F/27 °C.
PROBLEM | CAUSE | SOLUTION |
Tool will not operate. | Hydraulic system not engaged or | Engage or start hydraulic system. |
| running. |
|
| Hydraulic system control valve OFF. | Turn the system control valve ON. |
| Tool not connected to the Hydraulic | Connect tool to the system. |
| 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 | Have repaired by authorized dealer. |
| contaminated hydraulic fluid. |
|
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 | Have inspected and repaired by |
| is damaged. | authorized dealer. |
Hydraulic oil leaks between | Seals worn or piston rod worn. | Have repaired by authorized dealer. |
valve handle and outer tube |
|
|
handle. |
|
|
PR41 User Manual ◄ 15