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4-22
Routine Service and Maintenance
Trencher Boom Replacement
Adjust the digging chain tension every 25 operating hours. With the trencher parallel to the
ground, make that there is 1¾" to 2" of chain sag between the bottom of the boom and the top
of the bottom chain span. See Figure 4–20.
For this procedure, raise the trencher off the ground a short distance to make working on it easier.
Make sure to shut off the machines engine and remove the key from the ignition.
Inspect the bottom of the boom for wear, if it is worn, complete the following:
Some parts in Figure 4–20 have been removed for clarity.
1. Remove the boom guard (Item 1, Figure 4–20) from the boom assembly.
2. Loosen the Chain Tension Adjustment Bolt lock nut (Item 5, Figure 4–20) and Chain
Tension Adjustment Bolt (Item 4, Figure 4–20) to fully release the chain tension.
3. Remove the chain from the boom tip sprocket. The trencher chain does not need to be fully
removed for this procedure.
4. Slide the boom assembly (Item 3, Figure 4–20) forward and off the trencher frame (Item 7,
Figure 4–20).
5. Flip the boom assembly over so the bottom becomes the top. If the boom assembly has
already been flipped, replace it with a certified BOXER replacement part.
6. Slide the boom assembly back onto the main trencher frame tube.
7. Reinstall the chain onto the trencher nose roller.
8. Adjust the chain tension following the “Adjust the Digging Chain Tension” instruction listed
earlier in this manual.
9. Tighten the lock nut (Item 5, Figure 4–20) to secure the tension adjustment bolt (Item 4,
Figure 4–20) in position.
NOTICE
CAUTION
NOTICE