Greenlee LRF 75 Manuel D'instructions page 17

Maintenance (cont'd)
SAW CHAIN AND BAR MAINTENANCE
New Chain Break-In
1. Run the saw at low chain speed without cutting
wood for 2 to 3 minutes. Check the output from the
automatic oiler.
2. Stop the hydraulic power source. Disconnect the
hoses. Allow the bar and chain to cool. Check the
tension and adjust if necessary.
3. Connect the hoses. Start the power source. Make a
few easy cuts at moderate chain speed.
4. Stop the hydraulic power source. Disconnect the
hoses. Allow the bar and chain to cool. Check the
tension and adjust if necessary.
5. Connect the hoses. Start the power source. Use the
saw for moderate cuts during the next 30 minutes of
use.
Checking Chain Tension
1. Stop the hydraulic power source. Disconnect the
hoses. Allow the bar and chain to cool.
2. Pull the saw chain around the bar. The chain should
rotate around the bar easily. If it does not, see Chain
is Difficult to Rotate Manually in the Troubleshooting
table.
3. Check the tension as follows:
Pull the saw chain away from the bar (see the
illustration) using approximately 4.4 Newtons (2
lb) of force. The clearance between the chain and
bar should be approximately 3.2 mm (1/8"). If there
is too much or too little clearance, proceed to
Adjusting Chain Tension.
Proper Chain Tension
Approx.
4.4 Newtons
(2 lb.)
Greenlee Tools, Inc.
Long-Reach Chain Saws (Foam-filled)
Adjusting Chain Tension
1. Loosen the two guide bar mounting screws.
2. Turn the saw chain tension adjusting screw until the
proper tension is achieved, as follows:
Pull the saw chain away from the bar (see the
illustration) using approximately 4.4 Newtons (2 lb)
of force. The clearance between the chain and bar
should be approximately 3.2 mm (1/8").
3. Hold the bar nose up and tighten the two bar flange
nuts. Torque to 16.9 Newton-meters (150 in-lb).
4. Check the chain tension again.
5. Rotate the chain around the bar manually. If you hear
a clicking noise, the chain drive links are hitting the
bar. Repeat the Adjusting Chain Tension procedure.
Bar Service
1. Mark the top side of the bar with a grease pencil or
marker.
2. Remove the chain and bar. Use a small cleaning
brush to remove all residue from the bar groove.
3. Clean the oil passage at the base of the guide bar.
Use any instrument small enough to thoroughly
clean the passage.
4. Check the bar rails for wear by placing a straight
edge against the side of the bar and one cutter.
• Clearance between the bar and straight edge
indicates that the bar rails are not worn.
• If the chain leans and there is little or no clearance
between the bar and straightedge, the bar rails
are worn and the bar should be replaced.
CHAIN IS STRAIGHT
Clearance
Approx.
3.2 mm
(1/8")
17
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Checking Rails for Wear
CHAIN LEANS
Rails are
No
not worn. Clearance
Rails are worn.
Replace bar.