CHAPTER 4
Maintenance Procedures
S36 ROCKDRILL | PARTS & SERVICE MANUAL
January, 2021
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11. Insert the chuck assembly Ref. 69 into the front
cylinder bore and engage the gear teeth on the
chuck with the idler gear.
12. The front cover Ref. 72 can now be fitted into the
front bore of the reduction housing.
13. The chuck Ref. 71 should be fitted into the
fronthead making sure that the dog drive at the
rear end is correctly located with the dogs on the
chuck gear.
14. The backhead Ref. 18 may now be fitted over the
spacer and locating pin, push it firmly into
position.
15. Insert the side rods Ref. 75 through the lugs in
the backhead and down the machine. Fit the lock
nuts Ref. 76 over the threads between the two
lugs on the fronthead. Make sure the head of the
side rod is located correctly on the lug of the
backhead.
The lock nuts should be screwed lightly against
the front cover and locked together. They are
only intended to prevent the machine coming
apart when the main nuts are removed.
16. Fit the correct striking bar Ref. 74 into the front
of the machine and attach the fronthead
locking plate Ref. 73 with the nuts Ref. 77.
Tighten the nuts evenly to a torque of 260 Nm
(192 ft-lb).
17. The water tube Ref. 8 should be fitted into the
backhead. Make sure it is the correct type for the
striking bar being used and that the rubber Ref.
9 is in good condition and pushed into place
beneath the flange. Push the tube into the
machine until it is seated. The water tube plug
Ref. 6 should be screwed into place making
sure the O-ring Ref. 7 is correctly fitted.
18. The air inlet stem Ref. 1 can be assembled into
the air inlet bend Ref. 5 making sure the nut
Ref. 4 is in place first. Always use a new copper
washer Ref. 3 when replacing the air stem.
19. The assembly should be screwed into the
threaded bore in the backhead making sure the
O-ring Ref. 2 and the copper washer Ref. 3 are in
place.
20. The water stem should now be fitted. The stem
thrust pad Ref. 17, the stem rubber seal Ref. 16
and the stem thrust washer Ref. 15 should be
fitted to the inside. The stem nut. Ref. 13 should
be fitted over the stem taking care that the O-
rings Ref. 12 and 14 are in place. The nut may
then be threaded into the threaded hole in
the backhead.
