10
Trouble Shooting Chart For ATW Series Torque Wrench
SYSTEM
PROBLEM CAUSE
REMEDY
Cylinder will not advance
Coupler loose or damage d
Directional control valve on pum p faulty
Coupler not mated secure ly
Tighten/Replac e
Disassemble and clean /
replac e
Tighten
Cylinder will not retract See above
See above
Cylinder will not build up
pressure
Piston seal leak
Coupling is not mated properly or is
defective
Gauge
Replace seals
Replace coupling
Replace gauge
Cylinder leaks
Leaking seals
Replace housing
seals
Cylinder operates
backwards
Coupler s are reversed on hoses,
pump, or tool.
Reverse couplers
Ratchet returns on
retract stroke
Broken reaction pawl
Defective reaction pawl spring
Replace
Replace
Ratchet will not make
successive strok es
Defective drive pawl spring
Defective drive pawl
Cylinder is not retracting completely
Replace
Replace
Remove and cycle tool
freely and return to job
Tool cannot be removed
from nut
Reaction pawl is engaged
Begin forward cylinder
stroke. While applying
pressure, push down on
release lever (on side of
tool). While holding release,
allow the cylinder to retract.
Remove tool
No pressure reading on
gauge
Gauge not tight
Pump coupling broken
Gauge defective
Defective cylinder seals
Tighten coupler
Replace
Replace
Inspect and replace all
cylinder seals
Pump will not build
pressure
Defective relief valve
Air supply too low or air hose size too
small
Electric power source is too low
Gauge
Filter is clogged
Inspect and replac e
Check for 100 PSI air
pressure, 1" ID air hos e
Insure suitable electric
power sourc e– 25amps – 12
gauge or larger extension
cord
Replac e
Inspect & clean, or repla ce
Pressure reading erratic
Defective gauge
Differential control valve bad
Replace
Replace
ATWS
Series
Hydraulic Torque Wrench
