Komatsu SDA6D140E-3 - Page 362

15-4
140-3 SERIES
TESTING AND ADJUSTING CYLINDER HEAD
3) Adjust the position of the grinder so that the
center of grindstone is at the center of
seat insert (1), then tighten the set screw to
fix the grinder in place.
4) Rotate the grindstone and move it slowly
until it contacts insert (1).
5) Press the grindstone lightly against the
inside face of the insert and make a groove
around the whole circumference of the
inside face of the insert.
 Depth of groove: Approx. 1 mm
6) Push the three claws a of puller head of
tool A inwards by hand, and fit into insert (1).
7) Tighten screw to push the three claws
into the groove on the inside face of the
insert.
 When the claws are completely in con-
tact with the groove, stop tightening.
8) Insert bridge on the outside of the puller
head, set plates and on top of the
bridge, and tighten nut to pull out the
insert.
• When welding a bar to the insert to remove
1) Weld bar (1) (diameter: approx. o10) of a
diameter 0.1 – 0.5 mm smaller than the
inside diameter of the insert to insert (2).
 Be careful not to deposit any of the weld-
ing metal on the head itself.
2) When the temperature of the weld has
dropped to around room temperature, insert
a used valve (3) in the opposite direction,
and hit the face of the valve with a small
hammer to remove the insert.
 Be careful not to hit too hard, as any ex-
cessive shock may cause the weld to
break off.