26
Fig. 32: File off point of catch to align catch clevis pin.
13.3 Catch Replacement
Newer buckets use a standardized catch and trip block
which should not require the following procedure when
replacing the catch.
However, replacing the catch in older buckets
(manufactured before June 1993) the following
procedure may be required.
1) Check the trip line for play in the tube and snug
up swage sleeves with a swaging tool if necessary to
ensure tube is snug between the bullets.
2) Remove the catch spring and the return spring.
These parts are identified in Parts Diagram 18.1.
3) Remove the bottom cotter pin on the catch clevis
pin and then remove the catch clevis pin and the
damaged catch.
4) With the trip line installed, place the new blank
catch in its slot and slide the point in against the tube on
the trip line. Keep the tail of the catch in place under the
ball bearing. Note the amount that must be filed off the
point of the catch to allow the hole in the catch to fit
through the hole in the trip block (see Fig. 32). File or
grind off the point of the catch in a radius centered on
the hole in the catch. Keep the ground point square to
the faces of the catch. Round the corners of the filed
point smoothly to remove burrs.
5) Install the catch with the catch clevis pin and check
that the filed point just touches the tube on the trip line.
6) When the solenoid retracts, the tail of the catch
must clear the bearing in order for the trip line to be
released. Operate the solenoid by hand to check that
the tail of the catch will clear the bearing. If it does not,
remove the catch and grind the tail of the catch so that
it will clear the bearing. File edges just enough to remove
any burrs.
13. CONTROL HEAD MAINTENANCE
TRIP BLOCK
CATCH POINT
FILE OFF THIS AMOUNT TOALLOW
HOLES TOLINE UP
FILE OFF IN A RADIUS
CENTERED ON THE
HOLE
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