Homelite UT74121A Operator's Manual page 32

MAINTAINING THE GUIDE BAR
See Figure 68.
CAUTION:
Make sure the chain has stopped before you do any
work on the saw.
Every week of use, reverse the guide bar on the saw to
distribute the wear for maximum bar life. The bar should be
cleaned every day of use and checked for wear
and damage.
Feathering or burring of the bar rails is a normal process of
bar wear. Such faults should be smoothed with a file as
soon as they occur.
A bar with any of the following faults should be replaced:
Wear inside the bar rails which permits the chain to lie
over sideways
Bent guide bar
Cracked or broken rails
Spread rails
In addition, lubricate guide bars (with a sprocket at their tip)
weekly. Using a grease syringe, lubricate weekly in the
lubricating hole.
Turn the guide bar and check that the lubrication holes and
chain groove are free from impurities.
MAINTENANCE
RESTORE ORIGINAL
SHAPE BY ROUNDING
THE FRONT
Fig. 67
LUBRICATING HOLE
Fig. 68
UK - Page 32
MAINTAINING THE SAFE-T-TIP NOSE
GUARD
See Figures 69 and 70.
CAUTION:
Make sure the chain has stopped before you do any
work on the saw.
WARNING:
Although the guide bar comes with a SAFE-T-TIP anti-
kick-back device already installed, you need to check
the tightness of the mounting screw before each use.
Tighten the mounting screw of the nose guard as instructed
below. These are specially hardened screws. If you cannot
install the screw tightly, replace both the screw and the
SAFE-T-TIP before further operation. Do not replace the
screw with an ordinary screw.
In addition to preventing chain contact with solid objects at
the nose of the bar, the SAFE-T-TIP also helps keep the
chain away from abrasive surfaces, such as the ground.
Keep it on the right-hand side of the bar where it will be between
the chain and the ground during flush with ground cutting.
The mounting screw requires a 5/16 in. spanner (or adjustable
spanner) to achieve the recommended tightness of 4-5 Nm
(35 - 45 in. lb.). A tightness within this range can be
achieved by using the following method.
1. Tighten the screw with your finger.
2. Tighten the screw an additional three-quarters of a turn
using a spanner.
MOUNTING
SCREW
SAFE-T-TIP
Fig. 69