ADJUSTMENT/MAINTENANCE
AU104488 C6B 48
2. Use a brush to remove carbon deposits from the
spark arrester screen. Be careful to avoid damaging
the screen. The spark arrester must be free of breaks
and holes. Replace the spark arrester if it is damaged.
RT160050
3. Install the spark arrester in the muffler and reinstall
the special screw.
DIGGING CHAIN TENSION
Checking Tension
RT160064
Raise the boom until the bottom is parallel with the
ground.
Proper chain adjustment is achieved when the slack
between the digging chain (2) and the bottom of the
boom weldment (1) is at the proper proportion. For most
digging conditions, adjust the chain deflection to 25.4 mm
(1 inch). Dimension should be checked when chain is at
ambient temperature.
See the following to adjust chain tension.
DECREASING CHAIN TENSION
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CHAIN ADJUSTMENT LOCATION
1. Loosen and remove the bottom bolt (1) securing the
right-hand access cover.
2. Loosen the top bolt (2) to allow the right-hand access
cover to swing away, exposing the grease fitting
cavity.
3. Clean the area around the grease fitting (3) with
cleaning solvent.
4. Remove the grease fitting cap.
5. Slowly loosen the grease fitting plug
(counterclockwise) 2 or 3 revolutions to let grease
flow from around the plug. DO NOT remove the
plug.
6. When the chain tension is correct, tighten the plug.
It may be necessary to apply a small force to the
end of the trencher boom to give slack in the chain.
7. Reinstall the grease fitting cap.
8. Fold the cover back into the closed position and
reinstall the top bolt (2). Tighten both bolts (1 and
2) to 258 Nm (170-190 lb ft).
NOTE:
Check the chain tension after you have dug a
trench approximately 3 m (10 feet) in length.
NOTE:
Never replace the tension release plug with a
standard pipe plug. Replace with the original equipment
plug which has a grease relief groove.
1
2
WARNING:
Do not remove the grease fitting
from the boom before the pressure has been
released. Personal injury can result.
3
1
2
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