MAINTENANCE
12
EN
Assembly of the Hammer Drill
1
If the Throttle Valve Stem Bushing (8) was removed, press
a new Bushing into the Handle (1).
2
Position the Throttle Lever (2) in the Handle and secure it
by pressing the Throttle Lever Pin (3) into the Handle and
through the Throttle Lever.
3
Insert the Throttle Valve Stem (6) into the Throttle Valve
Stem Bushing.
4
Position the slotted end of the Throttle Valve Face (7)
against the Throttle Valve Pin.
5
Install the smaller diameter end of the Throttle Valve
Spring (9) on the short hub of the Throttle Valve Pin (5).
Using the Spring to hold the Pin, install the long end of the
Throttle Valve Pin into the Throttle Valve Face.
6
Install the Inlet Bushing Seal (10A) on the Inlet Bushing
(10).
7
Thread the Inlet Bushing Assembly into the Handle and
tighten it to 12 Nm (9 lbs.ft.) torque.
8
Grip the front end of the Barrel (23) very lightly in leather
covered or copper covered vice jaws with the bit end
downward.
9.
Insert the Nozzle (22) into the Barrel from the handle end
of the Barrel.
10. Insert the Chuck Sleeve (17) into the Barrel, making
certain the two hubs on the leading end of the Sleeve
mesh with the recesses in the end of the Nozzle.
11. Using needle nose pliers, insert one of the Ratchet Key
Pin Springs (21) into the hole in the inner wall of the
Barrel.
12. Position the small diameter end of the Ratchet Key Pin
(20) inside the Spring.
13. While compressing the Spring with the Pin, insert the
Ratchet Key (19), flat end first, into the lengthwise groove
in the Barrel. Slide the Key to the end of the groove
capturing the Spring and Pin between the Ratchet Key
and the wall of the Barrel.
14. Repeat steps 11, 12 and 13 on the opposite side of the
Barrel.
15. Push both Ratchet Keys toward the wall of the Barrel and
install the Ratchet Gear (18) in the Barrel.
16. Insert the Piston (16) into the Cylinder (15).
17. While grasping the protruding shaft of the Piston and
supporting the Cylinder, engage the two spiral grooves of
the Piston with the internal teeth of the Ratchet Gear.
18. Reach into the front end of the Barrel and apply firmer
pressure against the Nozzle to prevent it from rotating. At
the same time, rotate the Piston and Ratchet Gear until
the two straight grooves of the Piston engage the internal
teeth of the Nozzle or Chuck Sleeve. When properly
oriented, the Piston and Cylinder will move forward until
the Cylinder butts against the Barrel.
19. If the Valve Pins (12) were removed at disassembly, press
the two Valve Pins into the Valve Seat (11) until they stop
against the bottom of the hole. There are five holes in the
bottom half of the Valve Seat. Press the Pins, one on each
side, into the two holes in the lower half of the Valve Seat
nearest the Assembly Rod clearance grooves.
20. Install the Valve (13) in the counterbore of the Valve Seat.
21. Align the holes in the Valve Cap (14) with the holes in the
Valve and, with the hub end trailing, slide the Valve Cap
onto the Valve Pins and against the Valve and Valve Seat.
22. Position the Valve Cap, Valve Seat and Valve against the
rear of the Cylinder.
23. Position the assembled Handle (1) against the Valve Seat
and slide Assembly Rods through the Handle and the
Barrel adjusting all parts requiring alignment.
24. Grasping the Barrel, and with pressure against the
Assembly Rods, carefully remove the tool from the vice
and stand the tool upright on its Handle on a workbench.
25. Install the Assembly Rod Springs (25) and Assembly Rod
Nuts (26) on the Assembly Rods. Tighten the Nuts evenly
to 8Nm (6Ibs.ft.) torque.
