Black Max BM5020 Operator's Manual page 31

MAINTAINING THE GUIDE BAR
See Figure 56.
CAUTION:
Make sure the chain has stopped before you
do any work on the saw to avoid accidental
starting or contact with the moving chain that
may result in injury.
Proper maintenance will maximize the useful life of
the guide bar.
Each day of use:
Clean the bar and check for wear and damage.
Feathering or burring of the bar rails is a normal pro-
cess of bar wear, but such faults should be smoothed
with a file as soon as they occur.
Each week of use:
 Reverse the guide bar on the saw to distribute the
wear.
 Lubricate the sprocket at the end of the guide bar
using a grease gun in the sprocket lubrication hole.
 Turn the guide bar and check that the lubrication
holes and chain groove are free from impurities.
A bar with any of the following faults should be
replaced immediately:
 Wear inside the bar rails that permits the chain to
lay over sideways
 Bent guide bar
 Cracked or broken rails
 Spread rails
MOUNTING THE SAFETY TIP NOSE GUARD
See Figures 57 - 58.
 Stop the engine and disconnect the spark plug
wire.
 Mount the safety tip on the bar nose.
 Fit the locking tab in the recessed slot in the guide
bar.
 Tighten the mounting screw with wrench until
snug.
 From the snug position, tighten the mounting
screw an additional 3/4 of a turn using a wrench.
 Check the security of the safety tip nose guard
and its mounting screw before each use of the
chain saw.
MAINTENANCE
TIGHTEN 3/4
OF A TURN
MAINTAINING THE SAFETY TIP NOSE
GUARD
See Figures 57 - 58.
WARNING:
Although the guide bar comes with a safety tip
antikickback device already installed, check the
tightness of the mounting screw before each use.
Use the following instructions to tighten the mount-
ing screw of the nose guard. These are specially
hardened screws. If you cannot install the screw
tightly, replace both the screw and the safety tip
before further operation.
Page 31 — English
SPROCKET
LUBRICATION HOLE
LUBRICATION HOLES
MOUNTING
SCREW
SAFE-T-TIP™
Fig. 56
Fig. 57
Fig. 58