MACHINE ADJUSTMENTS
Some components of the motor grader will need
periodic adjustments for optimum performance and
to reduce wear and tear. Always park the vehicle on
level ground and turn off the engine before making
adjustments. Do not make adjustments with load.
DO NOT leave the engine running
while making adjustments or repairs unless
specically recommended. NEVER make
adjustments to any part of the grader while it is in
motion.
Keep bystanders at a safe distance,
especially when raising or lowering attachments.
Moldboard Blade
Because the moldboard does the hard cutting work,
keeping it in well-maintained and properly adjusted is
crucial for ensuring productivity and longevity.
Check the blade edge weekly. The blade’s cutting edge
should be at least 1.5 inches (3.8 cm).
• Clean blade and remove debris or material daily.
• Check for loose, damage or missing bolts and linkage.
Tighten or replace immediately to prevent damage.
To adjust the moldboard blade:
1. Park the machine on level ground.
2. Place a block under the moldboard attachment
and lower the moldboard until it rests lightly on the
ground.
3. Slightly raise and lower the blade a few times
to check tightness of the moldboard bolts and
components. Check for any “play” between the
moldboard and slide.
4. Engage the park brake, turn off the engine, and
block all four wheels to ensure the machine does
not move while making adjustments.
Ensure the weight of the moldboard is
supported and stable before starting procedure:
If excessive clearance is noted between the front and
rear of the moldboard slide bar:
1. Remove bolts and nuts holding upper and lower
shims and clamps on back side of the moldboard.
(Figure 5-4)
Planetary Hubs
The planetary hubs on the rear bogie axle should be
checked quarterly to ensure they contain the proper
amount of gear oil. A drain/ll plug is located on the
outer end of the planetary hub on each of the four tires.
(Figure 5-3)
1. With assistance from a ground guide, slowly drive
the machine forward on a level surface until the
planetary hub plug is at the 3 o’clock or 9 o’clock
position.
Fill
Plug
Figure 5-3. Planetary Hub Fill Plug (Shown in the
3 O’Clock Position)
2. Shut off the engine and apply the park brake.
3. Unscrew the planetary hub plug.
4. Oil should be level with bottom of plug hole.
5. If the oil level isn’t visible or level with the plug hole,
add more gear oil and reinsert plug.
6. Let the grader sit for at least ve minutes to allow the
oil to ow to the hubs.
7. Remove the plug and recheck the oil level.
8. Repeat Steps 5 - 7 if needed.
Maintenance
LeeBoy 685D Motor Grader5-10
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