GROVE 5-21
CD3340B/YB4411 MAINTENANCE
Published 04/07/2015 Control # 569-00
Inspect the Boom Chain Tension
The boom chains should be checked for the correct tension
to ensure proper retraction of the boom sections.
Lower Retract Chain
To check for correct tension on the lower retract chain loosen
the jam nut on the retract chain adjusting screw
(Figure 5-37). Check the retract chain for looseness by
prying the retract rod adjusting nut away from the plate
(Figure 5-37). If a gap is present adjust the chain tension.
Upper Extend Chain
Check the extend chain for looseness by prying the extend
rod retaining nut away from the bulkhead plate (Figure 5-38).
If a gap is present adjust the chain tension.
Inspect Hydraulic Hoses
Inspect hydraulic hose assemblies for leaks, damaged
fittings and worn exterior. Do not use your hands to check for
hydraulic leaks. Hydraulic oil under pressure can cause
serious injury or possible death. Use a piece of cardboard or
other material as a deflector to detect leaks. Replace any
problem hose before beginning work.
a0161
FIGURE 5-36
Turned Pin
FIGURE 5-37
p0322
Adjusting Nut And Jam Nut Location
FIGURE 5-38
p0322
Pry Nut Away From Bulkhead Plate
Reference Only
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