Ditch Witch RT120 - Manual (Page 171)

Service - 170
RT120 Operator’s Manual
10 Hour
Check Personnel Restraint Bar/
Trench Cleaner Bolts
Check all bolts that mount restraint bar/trench
cleaner to arm every 10 hours and tighten as
necessary to keep bolts tight. Check for
looseness or wear. Apply Loctite 271
®
adhesive.
Check that bolts holding personnel restraint bar/
trench cleaner to arm are tightened to 350 ft•lb
(475 N•m). Bolts mounting arm to boom should
be tightened to 400 ft•lb (542 N•m).
Check Digging Chain Tension .
Check digging chain tension every 10 hours.
With boom horizontal, measure distance from
bottom of boom to chain. When properly
adjusted, distance should be 4.5 - 5.5” (114 - 140
mm).
To tighten chain, loosen six bolts on trencher
boom and pump EPG into cylinder. To relieve
chain tension, loosen plug on grease cylinder.
Fluid pressure could pierce skin and cause injury or death. Stay away.
To help avoid injury: Service digging boom grease cylinder only while standing on opposite side of
boom. Wear gloves and safety glasses, and cover fitting with cloth when relieving pressure in cylinder.