20
L4463 (
rev
.
c
)
Troubleshooting Chart (continued)
Symptom
Possible Cause
Solution
5. Torque wrench advances
or retracts erratically.
a. Air in the hydraulic system.
Advance and retract the torque wrench until operation is
smooth. Refer to Section 8.4.
b. Low air pressure and/or flow.
Increase air pressure as required. Verify that compressed
air system is capable of producing the minimum required
pressure and flow. Refer to Section 3.1.
c. External leak in hydraulic system.
Check entire hydraulic system for leaks. Tighten, repair or
replace components as required.
d. Torque wrench internal leakage.
Worn or damaged internal
components.
Troubleshoot torque wrench.
Tighten, repair or replace components as required.
Refer to torque wrench manufacturer’s repair and
overhaul instructions.
e. Internal leak in hydraulic control
valve
or pump
element. Worn or
damaged internal components.
Troubleshoot pump hydraulic control valve and pump
element.
Tighten, repair or replace components as required.
