Komatsu D51EX-24, Operation & Maintenance Manual

Page: 317 / 382

• Standard shim thickness: 6 to 8 mm
1.
Remove the bolt (1) and loosen the bolts (2) (5 pieces).
2.
Remove all the shims (3) and tighten the bolts (1) and (2)
lightly so that the dimension of clearance (A) becomes
even at whole circumference.
3.
Measure the clearance (A) and set the shim thickness so
that it is between (A + 0.2) and (A + 1.2) mm.
The shim thickness can be set by removing some shims
from the number of shims to use.
Shim thickness (number of shims to use): 0.5 mm (2
pieces), 1.0 mm (8 pieces)
4.
Restore the shims of the thickness which is set in step 3 to
the original position, and tighten the bolts (1) and (2) light-
ly.
5.
Angle and tilt the blade to check the play at center ball por-
tion.
• When no creak sound is heard and the blade moves
smoothly, the adjustment is completed.
• If a creak sound is heard or the blade does not move
smoothly, add shims.
• If the play at the ball portion is still large, remove more shims.
6.
After adjusting, tighten the bolts (1) and (2).
Tightening torque: 455 to 565 Nm {46.5 to 58 kgm}
METHOD FOR ADJUSTING SHIMS AT PITCH BALL
k k
WARNING
Place the work equipment lock lever at LOCK position except when operating the blade for adjustment.
The shim adjustment of the pitch ball portion is required in the following cases.
• When a play is found at the pitch ball portion
• When the blade is assembled again after it has been removed for transportation
If it is not adjusted, the blade response to the operation becomes worse, and soil and sand enter and cause
premature wear or damage of the ball.
Adjust as follows.
• Correct value for play at ball joint: 0.2 to 0.7 mm
• Standard shim thickness: 3 to 5 mm
MAINTENANCE MAINTENANCE PROCEDURE
4-41