Stanley DL07, Operation And Service Manual

Page: 14 / 23

14
TROUBLESHOOTING
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem. When diag-
nosing faults in operation of the wrench, always check that the hydraulic power source is supplying the correct hydraulic
fl ow and pressure to the tool as listed in the following table. Use a fl ow meter known to be accurate. Check the fl ow with
the hydraulic fl uid temperature at least 80
o
F/27
o
C.
PROBLEM CAUSE SOLUTION
Tool will not start.
Power not being supplied. Check to make certain that both hoses
are connected.
Turn hydraulic circuit control valve ON.
Defective quick disconnects. Check each quick disconnect.
Low drilling torque.
Relief valve set too low. Set relief valve at 2100 psi/145 bar.
Fluid restriction in hose or valve.
Excess fl ow and pressure loss.
Locate and remove restriction.
Use correct fl uid.
Fluid not warmed up. Prehead system.
Hoses too long for hose ID. Use
shorter hose.
Hose ID too small for hose length. Use
larger ID hose.
Low tool speed. Fluid fl ow rate is too low. Check circuit fl ow rate.
High tool speed. Fluid fl ow rate is excessive.
Check circuit fl ow rate. Add proper
fl ow control valve or reduce the pump
RPM.
Oil leaks around gear housing. Hydraulic pressure and return hoses
reversed. Correct hose connections. Pressure
should be to the handle port away
from the trigger, return is near the
trigger, then replace the main shaft oil
seal.
Oil gets hot, power unit working hard.
Open-center tool on a closed-center
circuit or vice-versa. Use tools to match circuit.
Circuit relief set too low. Adjust relief valve to 2100 psi/145 bar.
Too much oil going through tool. Adjust fl ow for 12 gpm/45 lpm maxi-
mum or less.
Oil leaks at reversing spool.
Damaged O-Rings. Replace as required.
Wrong hydraulic fl uid. Circuit too hot. Refer to Operation Instructions for cor-
rect fl uid/circuit specifi cations.
Oil leak at motor cap face.
Fasteners loose. Refer to Service Instructions
Face O-Ring worn or missing. Replace as required.
Motor cap/main housing damaged. Replace as required.