48520 Pruner
Greenlee / A Textron Company
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
9
Troubleshooting
(cont’d)
Problem
Probable Cause
Probable Remedy
Tool feels hot.
Hydraulic fluid level low.
Check fluid level. Fill to FULL mark. Check system for
leaks.
Hydraulic fluid viscosity exceeds
specifications.
Use fluid viscosity recommended. Refer to the
Specifications and Parts manual.
Hydraulic fluid dirty.
Drain reservoir, flush and fill with clean fluid.
Change filter.
Tool control valve stuck in partial
power-on position
Free spool 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 and 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.
Tool control valve
sticks or works hard.
Check for dirt or gummy deposits.
Clean components.
Misalignment or binding of control
linkage.
Correct alignment. Lubricate linkage joints.
Replace damaged components.
Valve components worn or
damaged.
Disassemble valve and replace worn or damaged
components.
Tool operates
backwards.
Hydraulic flow reversed to tool.
Reverse flow to tool. Check for valve in system that
has reversed flow. Check hoses for proper flow.
Hydraulic pressure and return lines
connected to opposite tool ports.
Disconnect hoses. Reverse couplers.
Reconnect hoses to proper tool ports.
Tool components assembled
incorrectly.
Disassemble tool. Reassemble correctly.
Tool operates, but
blade does not cut.
Cutter blade loose.
Tighten cutter blade nut and bolt securely. Refer to
“Tension Adjustment” in the “Maintenance” section of
this manual.
Cutter blade not closing properly.
Readjust blade closure. Refer to “Closure Adjustment”
in the “Maintenace” section of this manual.
Cutter blade dull.
Remove blade and sharpen, or install a sharp,
new blade.
Extension assembly
loose.
Loose extension connector nut.
Tighten extension connector nut.
