TM 5-2420-232-10
0035
SAW CHAIN AND BAR MAINTENANCE
0035
New Chain Break-In
00035
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 (WP 0004).
3.
Disconnect the hoses (WP 0004).
4.
Allow the bar and chain to cool. Check the tension and adjust if necessary.
5.
Connect the hoses (WP 0004).
6.
Start the power source (WP 0004).
7.
Make a few easy cuts at moderate chain speed.
8.
Stop the hydraulic power source. Disconnect the hoses. Allow the bar and chain to cool. Check the tension and adjust if
necessary.
9.
Connect the hoses (WP 0004). Start the power source (WP 0004). Use the saw for moderate cuts during the next 30 min-
utes of use.
Checking Chain Tension
00035
1.
Stop the hydraulic power source (WP 0004).
2.
Disconnect the hoses (WP 0004).
3.
Allow the bar and chain to cool.
4.
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 (WP 0046).
5.
Check the tension as follows:
Pull the saw chain away from the bar using approximately 1 lb (4.4 N) of force. The clearance between the chain and bar
should be approximately 1/8 in. (3.2 mm). If there is too much or too little clearance, proceed to Adjusting Chain Tension
(Figure 4).
435-A1368
Figure 4. Proper Chain Tension
035
0035-6
