Ditch Witch 420sx, Operator'S Manual

Page: 109 / 141

Service - 108
420sx Operator’s Manual
10 Hour
Check Digging Chain Tension
Check digging chain tension every 10 hours.
Roller Boom with Adjusting Screw
With boom horizontal, measure distance from bottom of boom to chain (3). When properly adjusted,
distance should be 1.5-2” (40-50 mm). Adjust tension by tightening or loosening adjustment screw (1) and
jam nut (2).
Roller Boom with Grease Cylinder
With boom horizontal, measure distance from bottom of boom to chain (2). When properly adjusted,
distance should be 1.5-2.0
” (40-50 mm).
To tighten chain, remove plug and pump MPG into cylinder (1). To relieve chain tension, loosen plug on
grease cylinder.
Pressurized fluid or air could pierce skin and cause injury or death. Stay
away.
NOTICE: 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.