Moldboard Slide Cylinder
Hydraulic cylinders function by pressurized hydraulic
oil. The moldboard slide cylinder moves the moldboard
from side to side. Extensive wear or damage to
the cylinder could cause leaks, resulting in loss of
pressure that adversely affects performance. If you
notice hydraulic oil leaking on the moldboard or loss of
functionality, check the hydraulic hoses and ttings rst.
If the moldboard slide cylinder needs to replaced:
1. Park the grader on a level surface in a designated
area where oil does not touch or run off onto the
ground.
2. Engage the park brake and place wheel chocks on
wheels for safety.
3. Extend the moldboard left to its limit.
4. Remove the cotter pin, then the cylinder pin on the
left side of the slide cylinder. (Figure 5-40)
Cotter Pin
Slide Cylinder
Cylinder
Pin
Figure 5-40. Moldboard Slide Cylinder
5. Retract the moldboard and shut down the engine.
6. Disconnect, plug and tag the hydraulic hoses, being
very careful to prevent any contamination when
plugging the hydraulic hose ttings.
NOTE: Inspect the hydraulic ttings. Replace any
damaged or worn ttings.
7. Place a block or other means of supporting the
cylinder, then remove the cotter pin and cylinder
pin from the right side. Carefully slide the cylinder
away from the moldboard support frame to remove
it. Clean the area thoroughly before installing new
cylinder.
8. Position the new moldboard slide cylinder into
place.
9. Insert the cylinder pin on the stationary side rst,
then reconnect that hydraulic hose. Start the grader
and extend the cylinder rod to align it through the
mounting hole.
10. Reinstall cylinder and cotter pins on each side of
the cylinder. (It is recommended that you use new
cotter pins.)
11. Reconnect the hydraulic hoses according to the
tags for correctly reinstalling hoses.
12. Using a grease gun, lubricate the cylinder rod (left
side).
13. Start the engine and idle for a few minutes to ensure
the hydraulic oil has warmed in the system.
14. Extend and retract the moldboard several times to
ensure proper operation and check for leaks.
Maintenance
LeeBoy 685D Motor Grader5-34
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