Troy-Bilt TB25PS Operator's Manual page 21

SETTING THE CHAIN OIL ADJUSTMENT SCREW
WARNING:
If the chain oil reservoir becomes empty, the
chain oil adjustment screw hole becomes clogged, or the
saw chain fails to receive proper lubrication in any way, the
saw chain will overheat. This can cause irreparable damage
to the unit and serious personal injury.
Lubricating oil will automatically flow from the chain oil reservoir
onto the saw chain during operation. Use the chain oil adjustment
screw to adjust the flow of oil:
1. Insert a 3/32-inch Allen wrench into the chain oil adjustment
screw (Fig. 17).
• Turn the chain oil adjustment screw counterclockwise to
increase the oil flow.
• Turn the chain oil adjustment screw clockwise to reduce the oil
flow.
MAINTAINING THE GUIDE BAR
1. Rotate the guide bar frequently, at regular intervals (for example,
after every 5 hours of operation), to ensure even wear on the top
and bottom of the guide bar. Refer to Removing and Installing
the Guide Bar and Saw Chain.
2. Clean the guide bar groove and oil passages whenever the saw
chain is removed, when the unit has been used heavily or when
the saw chain appears dirty. Use a screwdriver, putty knife, wire
brush or similar instrument to remove debris from the guide bar
groove (Fig. 18). Use a small, soft wire to remove any debris
from the chain oil discharge hole (Fig. 19).
NOTE: If the oil passages are clear, the saw chain will give off a
spray of oil shortly after it begins to rotate during operation.
3. Frequently check the guide bar for damage (Fig. 20). Feathering
and burring of the guide bar rails (the ridges on either side of the
bar groove) is a normal process of guide bar wear. Such faults
should be smoothed with a file as soon as they occur (Fig. 20). A
guide bar with the following faults should be replaced:
• Wear inside the guide bar rails that permits the chain to lay
sideways
• Bent guide bar
• Cracked or broken rails
• Spread rails
Refer to Replacing the Guide Bar and Saw Chain.
Chain Oil
Adjustment Screw
Guide Bar Groove
Chain Oil Discharge Hole
Flat File
Bur
21
Fig. 17
Oil Passage
Fig. 18
Fig. 19
Uneven Wear Spread Rails
Fig. 20