Routine Service and Maintenance

Adjusting Digging Chain Tension

Adjust the digging chain tension every 25 operating hours. With the trencher parallel to the ground, make sure 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 4–18.

NOTICE

For a new chain, check the chain sag after the first hour of operation.

Depending on working conditions, chain sag adjustments may need to be done more frequently.

If a chain sag adjustment is needed, adjust the chain using the following procedure:

1 3/4 - 2”

2457

Figure 4–18 Chain Sag

NOTICE

Do not over tighten the chain. Excess chain tension may damage drive components.

4-20

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Cellboost 999-823 manual Adjusting Digging Chain Tension, Chain Sag

999-823 specifications

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