c. When installing rotation selector cam pin-
the gear rack of the piston so that
ion (26) in backhead (36), make sure that the
when rotation selector cam pinion
alignment marks (punch dots) on the pinion
handle (25) is attached and moved to
are alined with the marks on rotation selector
the neutral position (45 degrees from
the stop), the center tooth on the
d. When installing rotation selector cam
piston will be meshed with the pinion.
piston (32) into backhead (36), make sure that
(3) Mark the alinement location on the
the groove in the piston is aligned with the
meshing teeth of both the piston and
pinion. If the alignment marks are not visible,
the pinion, to facilitate subsequent
proceed as follows:
(1) Install rotation selector cam piston
(32) with related parts in backhead
(2) Install rotation selector cam pinion
(26) in backhead (36) and mesh with
on the drill mounting plate.
COMPLETE DRILL MOUNTING
c. Air Feed Motor. Disassemble air feed
motor in the numerical sequence as illustrated
This section contains repair instructions for
the complete drill mounting. The complete
procedures specified below:
drill mounting consists of the remote control
manifold, air feed motor, centralizer, drill
and pipe plugs (45), and drain the oil
mounting plate, and complete drill guide.
from the worm housing (71).
(2) Remove manifold bolts (7) and lock
washers (8) and separate motor air
manifold (9) from cylinder case (96).
Remove the complete drill mounting as de-
Remove seal rings (10).
(3) Remove live air stud screw (11) and
lock washer (12), and pull out re-
verse valve hole stud (14), and live
a. Complete Drill Mounting. Disassemble
air stud (15). Do not attempt to re-
complete drill mounting in the numerical se-
move reverse valve hole stud pin
(4) Remove screws (20) and lock wash-
Note. Air hoses and hose fittings are not shown
ers (21), and lift off exhaust cover
(22) and thrust plate (23). Remove
1-4 for complete piping diagram.
upper bearing cap (24) and upper
b. Remote Control Manifold. Disassemble
bearing spring (25).
remote control manifold in the numerical se-
(5) Remove screws (27) and lock wash-
ers (28), and separate worm housing
(71) and gear case (29) from' cylin-
Note. The manifold is made with five valves, four
der case (96).
of which are used. The quantities specified in the
legend for figure 6-3 reflect the actual parts installed.
(6) Remove self-locking nuts (30) and
The valve with no lever ball or extension is complete
separate gear case (29) from worm
internally although no connections are made to this
housing (71). Using a suitable puller,
valve, and the parts may be used as running spares.
remove crank pinion bearing (72.
The spool is interchangeable only with the BLOW
(7) Using a suitable puller, remove drive
spool. Each of the other spools are different. Stamped
letters on the end of each spool indicate the functions.
gear (31) and thrust bearing (32)