January 2004
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12
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Public Server/Manuals/UAN Pneumatic Nutrunner
Trouble Shooting
PROBLEM
CAUSE
SOLUTION
Loses torque every time the
fastener is run down. Finally the
tool will not run.
The Lock Pin did not get put
back into the Spring
Retainer.
Put the Lock Pin in the
Spring Retainer.
Tool operates intermittently.
One or more of the
shoulders on the Pilot Pin is
rounded.
Replace the Pilot Pin.
Spring under Pilot Pin has
lost tension.
Notch Pin is rounded.
Notch Pin Band is stretched
out of shape.
Tool shuts off as soon as it is started
or shuts off but will not re-start.
The shoulders on the Pilot
Pin are rounded.
z
Replace the Notch Pin,
Band, and/or Pilot Pin.
z
Replace Spring.
Valve Rod is too long.
Shorten Valve Rod.
Tool ratchets when it shuts off.
Bur on Pilot Pin or inside of
Cam.
Clean bur off of Pilot Pin or
Cam.
Loss of RPMs
Exhaust Filter is dirty causing
back pressure.
Filter.
Lever type only. Tool will not run.
The Valve Rod is pushed
through the Shut-off Valve.
Replace Shut-off Valve.
O-ring has gotten pushed
down into the Casing.
Tool runs all the time.
Air pressure is too high.
Put the O-ring back into its
seat.
Shut-off Valve damaged.
Replace Shut-off Valve.
Tool will not reset.
Valve Spindle installed
upside down.
Reinstall Valve Spindle
right-side up.
Shut-off Valve damaged.
Replace Shut-off Valve.
Tool will not reset.
Valve Spindle installed
upside down.
Reinstall Valve Spindle
right-side up.
Tool will not reset after it shuts off.
Pilot Pin and Cam not lined
up right.
Align the lobes on the Cam
and Pilot Pin.
Recommended Preventative Maintenance:
It is recommended that the whole tool be cleaned and inspected every 250,000 cycles or six months, whichever
occurs first.
Summary of Contents for UAN-611R
Page 1: ...REPAIR MANUAL UAN Series Pneumatic Nutrunner ...
Page 15: ......
