4
DISASSEMBLY — GENERAL (ALL MODELS)
Unscrew (left hand threads) and remove the spindle assembly
No. 281345. Unscrew the gear case assembly and unplug the
transducer wiring . Then remove the gear case and transducer.
Push the wiring back into the connector block No. 203152. The
motor unit may now be removed from the backhead. See the
following paragraphs for complete disassembly instructions on
the various subassemblies.
CLUTCH DISASSEMBLY
Unscrew the adjustment nut, No. 867875. That will release the
adjustment lock plate No. 867876, both bearing races No.
863455, thrust bearing No. 847104, torque spring No. 867938,
ball retainer No. 867881, and six (6) steel balls No. 842162.
Wash the spindle assembly in a solvent. Remove the ball
retainer ring, No. 867923, and ball retainer plug, No. 867908.
Rotatetheclutchspindletoallowthesixteen(16)steelballs,No.
844265, to drop out of the ball loading hole located in the clutch
cam, No. 867892. Separate the, clutch spindle and clutch cam
beingcareful not tolose the resetpin,No. 867888;resetspring,
No. 867895; sear plunger, No. 867886; plunger spring, No.
867896; and sear pin, No. 867909.
TRANSDUCER DISASSEMBLY
Removetheringgear and transducerassemblyfromtherearof
the transducer housing. Remove the retainer ring No. 619017,
from the transducer and tap lightly on a soft surface to remove
bearing No. 847566. Then remove the transducer from the rear
of the ring gear.
GEAR CASE DISASSEMBLY
Single Reduction — 20 Gear Trains
The spider should be pressed out the rear of the gear case.
RemovetheretainerringNo.844364,andpressthebearingNo.
847147, out the front of the gear case.
Ifreplacementoftheidlergearpinsisnecessary,theyshouldbe
pressedouttherearofthespider.SeeFig.1forreplacementpin
height.
Fig. 1 — Single Reduction Spider
Multiple Reduction — -2, -5, -7, -10 Gear Trains
All spiders should be removed from the rear of gear case.
RemovetheretainerringNo.844364,andpressthebearingNo.
847147, out the front of the gear case.
Ifreplacementoftheidlergearpinsisnecessary,theyshouldbe
pressedouttherearofthespider.SeeFig.2forreplacementpin
height.
2nd Reduction 1st Reduction
Spider Spider
Fig. 2 — Double Reduction Spiders
OPERATING & SERVICE INSTRUCTIONS
The torque of the 8MT & 8M nutrunner is controlled by the use
ofapressureregulatortochangethestalltorqueofthetool.The
torque of the 8MA nutrunner is controlled by the use of a
CLECOMATIC automatic shut-off clutch. Accurate torque is
achieved by setting the CLECOMATIC clutch to the desired
torque.
CLUTCH ADJUSTMENT
Shut off air supply to the tool and rotate the adjustment cover,
No. 202829, 180°to uncover the adjustment slot in the clutch
housing. Rotate the spindle until the hole in the adjustment nut
isvisibleintheslot.Use
a 1/8" (3mm) diameter
pin to hold the nut. Use
a suitable tool to turn
the spindle in a coun-
terclockwisedirectionto
increase torque or
clockwise to decrease torque. Return the ad-
justment cover to its closed position after every
adjustment. Note: If the clutch is adjusted over the
maximumpoweroutputofthetool,theclutchwillnotfunction
and the tool will operate like a stall-type tool. Also, if the tool is
being operated at its upper torque limits, a drop in air pressure
could cause the clutch not to function due to a loss of motor
power and the tool will function like a stall-type tool.
FLOW VALVE
The flow valve No. 203036, can be adjusted with a screwdriver
clockwise to lower the RPM and counterclockwise to raise the
RPM of the tool.
AIR SUPPLY
Thetool isdesignedto operateat90 psig(6.2bar) airpressure.
Theairpressureshouldbecheckedatthetool'sairinletwhilethe
tool is running. For maximum performance, use a 5/16" I.D. air
hoseup to 8'inlength. Ifadditionallength isrequired,a 3/8"I.D.
or larger hose should be connected to the 5/16" I.D. hose.
LUBRICATION
An automatic in-line filter-regulator- lubricator is recommended
asitincreasestoollifeandkeepsthetoolinsustainedoperation.
Thein-linelubricatorshouldberegularlycheckedand filled with
a good grade of 10W machine oil. Proper adjustment of the in-
line lubricator is performed by placing a sheet of paper next to
theexhaustportsandholdingthethrottleopenapproximately30
seconds. The lubricator is properly set when a light stain of oil
collects on the paper. Excessive amounts of oil should be
avoided.
Applicationofthetoolshouldgovernhowfrequentlyitisgreased.
It is recommended that the idler gears and right angle gears
receive a generous amount of NLGI 2-EP grease through the
grease fittings after 40 hours of operation.
STORAGE
In the event that it becomes necessary to store the tool for an
extended period of time (overnight, weekend, etc.), it should
receivea generousamountof lubricationatthattimeandagain
when returned to service. The tool should be stored in a clean
and dry environment.
OFF
.240
.255
Front Rear
.360
.375
Front Rear
