Black & Decker 3803-10 - Manual (Page 8)

ENSURE ADJUSTER NUT IS POSITIONED at the rear of the slot.
HOLD THE CHAIN SNUGLY on the guide bar with one hand (FIG, 12).
WITH THE GUIDE BAR AT A SLIGHT UPWARD ANGLE to clear the mounting bolt,
enter the loop end of chain into the housing and over the sprocket. If necessary, guide
the loop of chain with a finger of your other hand.
SLIP THE GUIDE BAR DOWN over the mounting bolt and set it on the mounting pad.
MAKE SURE THAT THE LUG ON THE ADJUSTER NUT ENTERS THE HOLE in the
guide bar.
(Se¥ere damage will result if the lug is not properly located).
INSTALL BAR PLATE AND WASHER on bar bolt, and secure with hex nut finger tight.
STAND SAW UPRIGHT and turn adjuster screw clockwise to move bar outwards and
tighten chain (FIG. 10)
YOU ARE NOW READY to adjust chain tension.
TURN ADJUSTER SCREW
CLOCKWISE TO TAKE UP
CHAIN SLACK
FIG, 10
FIG. 11
FIG 12
&
0
HOUSING CUT
1 AWAY FOR
§ 1 CLARITY
ADJUST CHAIN TENSION
With saw unplugged, using gloves and with the bar nut finger tight so that bar can move:
DRAW THE CHAIN along the bar rails by hand while turning the adjuster screw
clockwise to increase the chain tension. Cold tension is correct when the chain side
links are touching the bar rails, and the chain can be pulled along the bar without
binding. (FIG. 13)
TIGHTEN MOUNTING NUT with wrench to lock the bar at proper chain tension.
MAINTAIN CHAIN TENSION
A new Cham and bar will break in and need re-adjustment after as little as five cuts. This
IS normal, and the interval between adjustments will lengthen quickly.
Patience, to unplug the saw and adjust the chain, will result in longer life and improve
cutting performance.
After the break-in period, the chain will tend to droop when hot. This is normal and the
chain should not be adjusted unless the drive links are close to coming out of the bar
grooves (See FIG. 14). When this occurs, unplug the saw, loosen bar mounting nut,
adjust tension of warm chain to a maximum droop of 'T' (FIG. 15). Tighten nut.
Note; Correct chain tension is important for long life. If a chain is too loose or too tight,
the bar, chain and saw bearing will wear more rapidly.
SIDE LINK
CONTACTING BAR
FIG. 13
HANGING OUT OF BAR
FIG. 14
18 INCH (3mm)
BETWEEN SIDE
LINK AND BAR
AT BOTTOM
FIG. 15
CHAIN BRAKE AND HANDGUARD
Handguards on Models 3801-10, 3802-10, and 3803-10 also serve as chain brake
actuating lever.