OPERATING INSTRUCTIONS
CONTROLS
617 TRENCHER
G
G
5786
2-23-92
CHAIN TENSION ADJUSTMENT
When trenching, the digging chain tension should be adjusted so that
the chain is as loose as possible, without jumping off the sprocket or idler
wheel. To do this, an adjustment is provided on the digging boom.
These booms have an adjusting bolt on each side at the trencher end
of the boom. The head of the bolts are kept from rotating by special tubes
welded onto the mainframe. The end of the bolt rests in a tube welded to
the boom. Each bolt has a jam nut and a .75" hex nut on it. To tighten the
chain, "back off" the jam nut from the regular nuts. Now turn the standard
nuts off the adjusting bolts. This will push the boom out and thus tighten
the chain. Retighten the jam nut when finished. To loosen the chain, fol-
low the same procedure, except turn the hex nut onto the adjusting bolt.
(See Figure #5)
JAM NUT
SET SCREW
CRUMBER BAR
MAINFRAME CRUMBER
BAR TUBE
FIGURE #4
FIGURE #5
ADJUSTING BOLTS
TRENCHER
MAINFRAME
.75" JAM NUT
.75" HEX NUT
DIGGING BOOM
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