Troubleshooting - Stanley IW12 Service Manual

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
PROBLEM
Low performance or impact.
Wrench runs too fast. Impact mecha-
nism or screws broken.
Grease leaks at anvil busing, wrench
warm.
Grease leaks at anvil bushing, wrench
cold.
Oil leak at motor cap face.
Oil leaks at reversing spool.

TROUBLESHOOTING

o o
F/27 C.
Incorrect hydraulic fl ow.
Defective quick disconnects.
Worn impact mechanism.
Hammer pins broken.
Incorrect grease or periodic mainte-
nance of the impact mechanism is not
being performed.
Spools incorrectly installed.
Sockets or adapters too heavy or
loose.
Long bolt with lubricated head.
Incorrect hydraulic fl ow (too high).
Supply and return hoses reversed.
Relief sleeve or spring damaged.
Adjusting screw is in too far.
Hard duty cycle and heat forces
grease out.
Main shaft O-ring leaking.
Fasteners loose.
Face O-ring worn or missing.
Motor cap/main housing damaged.
Damaged O-rings.
Wrong hydraulic fl uid. Circuit too hot.
CAUSE
13
SOLUTION
Check that the hydraulic power source
is producing 4-12 gpm/15-45 lpm at
1000-2000 psi/70-140 bar.
Check each quick disconnect.
Repair or replace the impact mecha-
nism. See Service Mechanism Re-
moval Cleaning and Installation proce-
dure to extend mechanism life.
Replace with integral frame (with
pins). Check relief adjustment screw
setting. Job may require a larger
wrench.
See Service Instructions.
Valve(s) incorrectly reassembled. See
Service Instructions.
Use the correct impact type sockets or
adapters.
Lubricate threads only.
Check that hydraulic power source
is producing 4-12 gpm/15-45 lpm at
1000-2000 psi/70-140 bar.
Install hoses correctly. Refer to Opera-
tion Instructions in this manual.
Remove and replace spool assembly.
Adjust correctly.
Normal unless greasing instructions in
Service Instructions are not followed.
Replace as required.
Tighten to recommended torque.
Replace as required.
Replace as required.
Replace as required. Check Service
Instructions to avoid cutting O-rings on
cross holes in the spool bore.
Refer to Operation Instructions for
correct fl uid/circuit specifi cations.