Black & Decker Scrugun 402 - Manual (Page 3)

OPERA TION-CLUTCHES
In all Black and Decker Scruguns, a clutch provides a "dead”
or stationary front spindle to permit the driving accessory to
"locate” the screw slot or nut. Forward pressure then engages
the clutch and drives the fastener.
No. 12 Scruguns are equipped with either a "Positive” or
"Adjustable” clutch. Operation of these clutches is as follows:
Positive Clutch—With the positive clutch, output torque of the
screwdriver Is directly controlled by operator pressure against the
fastener. A heavy forward pressure will hold the clutch engaged
to a high torque; while light forward pressure allows the clutch to
disengage at a lower torque. Release of pressure completely
disengages the clutch. Maximum torque on a fastener is reached
by maintaining forward pressure on the tool and allowing the
clutch to ratchet momentarily; the resultant hammering will
further tighten the fastener.
Adjustable Clutch—The adjustable clutch mechanism allows the
operator to drive a series of fasteners to a pre-set uniform
torque. Torque output is controlled mechanically by a spring
loaded clutch mechanism and operator pressure on the tool has
no effect on output. The adjustable clutch mechanism is also
provided with a dead spindle so that complete release of pres­
sure on tool will disengage output spindle.
To adjust the clutch, slide the locking ring toward the gear
case. This action unlocks the adjusting ring and allows it to be
rotated. Turning the adjusting ring so that it moves toward the
gear case will increase the output torque of the clutch.
An increase in the force required to turn the adjusting ring
indicates that the clutch setting is Increasing.
Turning the ring so that it moves away from the gear case
will decrease the clutch setting. This is matched with a decrease
In effort required to turn the adjusting ring. CAUTION: Once
the adjusting ring is free from spring pressure additional loosen­
ing has no. further effect on the clutch and should be avoided.
If the adjusting ring is loosened too far it will come off the
tool allowing the locking ring and spring also to come off. No
damage is done and these can be reassembled by operator.
SPRING MECHANISM
DEAD SPINDLE CLUTCH
ADJUSTABLE CLUTCH
LUBRICATION
Black and Decker Tools are completely lubricated at factory and
are ready for use. Gears should be relubricated every 60 days
to 6 months depending upon use. To lubricate, remove gear
case, wipe out old grease, and refill gear case with B&D Heavy-
Duty Grease to the amount specified on the Parts List packed
with your tool.
It is also recommended that the clutch faces be given a light
greasing after every 50 hours of usage. Refer to "exploded"
parts bulletin (included with your tool) If you have any difficulty
in making the minor disassembly necessary to reach the clutch.
CLEANING
With the tool motor running, blow dirt and dust out of all air
vents with
dry air at least once a week. Also blow any dirt out of
Switches, Quick-change Chuck or Screw Depth Locator. If your tool
has a Locator, it should be disassembled after each day's work
and all parts cleaned with kerosene or other cleaning solvent.
Preferably, dry parts with an air hose with the motor running.
ACCESSORIES
Number 12 Scrugun Models can utilize practically every type
of fastening accessory (bits, bit tip holders, shanks for sockets,
etc.) with a hex shank.
Your Tool will handle a wide variety of bits and other fastening
accessories. Some of these are listed below, but for the very
many other types and sizes of accessories please see your Black
& Decker Distributor, or refer to Black & Decker Catalog No. 1.
SQUARE DRIVE SHANKS —
1/4" HEX DRIVE SHANK
No. 20510 2" Overall Length, For V a "
Square Drive Sockets
No. 20511 6" Overall Length, For "
Square Drive Sockets
PHILLIPS HEAD BITS —
lv4" HEX DRIVE SHANKS
No. 54595 No. 1 Point, 1-15/16" Overall
Length
No. 54592 No. 2 Point, 1-15/16" Overall
Length
No. 54594 No. 3 Point, 1-15/16" Overall
Length
BIT TIP HOLDERS —
1/4" HEX DRIVE SHANKS
No. 61108 Non-Magnetic, For V a "
Bit Tips
No. 63957 Magnetic, For Vi" Bit Tips
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HEX BIT TIPS
No. 38403 Phillips, No. 1 Point
No. 38404 Phillips, No. 2 Point
No. 38405 Phillips, No. 3 Point
No. 61102 Phillips Pozedriv®, No. 2 Point
No. 61104 Phillips Pozedriv®, No. 3 Point
No. 38406 Frearson Type (Reed & Prince)
SOCKETS (Use with Square Drive Shanks)
G. Cat. No. Type
Hex
Size
Diam.
20512 Non-Mag. 1/4" 1/2"
20514 Non-Mag. 5/16" 1/2"
20516 Non-Mag. 3/8" 9/16"
38420 Magnetic 1/4" 7/16"
38422 Magnetic 5/16" 1/2"
38424 Magnetic 3/8" 9/16"
SLOTTED HEAD SCREWS are easily driven with "Bit and Finder”
accessories. Finder Sleeve No. 65879 adapts the thread on the
front of the clutch housing to hold all 719000 series Finders
which then become integral with the housing.
If you prefer, separate Bits with Rotating Finders are available
to mount directly in the Scrugun chuck. See your B&D Catalog
No. 1 for the complete selection of accessories.