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IW12 User Manual ◄ 13
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 wrench, always check that the hydraulic power source is supplying the correct
hydraulic ow and pressure to the tool as listed in the following table. Use a ow meter known to be accurate. Check
the ow with the hydraulic uid temperature at least 80 °F/27 °C.
PROBLEM CAUSE SOLUTION
Low performance or impact. Incorrect hydraulic ow. Check that the hydraulic power source
is producing 4–12 gpm/15–45 lpm at
1000–2000 psi/70–140 bar.
Defective quick disconnects. Check each quick disconnect.
Worn impact mechanism. Repair or replace the impact
mechanism. See Service Mechanism
Removal Cleaning and Installation
procedure to extend mechanism life.
Hammer pins broken. Replace with integral frame (with
pins). Check relief adjustment screw
setting. Job may require a larger
wrench.
Incorrect grease or periodic
maintenance of the impact
mechanism is not being performed.
See Service Manual.
Spools incorrectly installed. Valve(s) incorrectly reassembled. See
Service Manual.
Sockets or adapters too heavy or
loose.
Use the correct impact type sockets or
adapters.
Long bolt with lubricated head. Lubricate threads only.
Wrench runs too fast. Impact
mechanism or screws broken.
Incorrect hydraulic ow (too high). Check that hydraulic power source
is producing 4-12 gpm/15-45 lpm at
1000-2000 psi/70-140 bar.
Supply and return hoses reversed. Install hoses correctly. Refer to
Operation section in this manual.
Relief sleeve or spring damaged. Remove and replace spool assembly.
Adjusting screw is in too far. Adjust correctly.
Grease leaks at anvil busing,
wrench warm.
Hard duty cycle and heat forces
grease out.
Normal unless greasing instructions in
Service Manual are not followed.
Grease leaks at anvil bushing,
wrench cold.
Main shaft O-ring leaking. Replace as required.
Oil leak at motor cap face. Fasteners loose. Tighten to recommended torque.
Face O-ring worn or missing. Replace as required.
Motor cap/main housing damaged. Replace as required.
Oil leaks at reversing spool. Damaged O-rings. Replace as required. Check Service
Manual to avoid cutting O-rings on
cross holes in the spool bore.
Wrong hydraulic uid. Circuit too
hot.
Refer to Operation section for correct
uid/circuit specications.
TROUBLESHOOTING