Instructions For Reassembly Of The R4Dw-X S - Hilti R4DW-X S Manual De Instrucciones

10.4 Safety valve piston assembly
(54): (Safety yoke already removed, see 10.3) Remove
this together with spring (67). Remove 0-rings (55)
using a scribe or 0-ring pick.
10.5 Nosepiece(8)
en
Magazine removed, see 10.1) Use a 5 mm Allen wrench
to remove 3 hex head screws (5) and spacing sleeves(7).
Remove nosepiece (8).
10.6 Trigger valve plunger (37) and valve bushing
assembly (35)
Remove 2 hex head socket screws (58) washers (57)
using 3 mm Allen wrench. Remove Valve Body Assem-
bly (56). Withdraw Trigger Valve Plunger Assembly (37)
together with Trigger Valve Bushing Assembly (35). Take
off 0-rings (36) and (38) using an 0-ring pick. Remove
0-rings (55) from Valve Body Assembly (56). (It may be
necessary to use small needle nose pliers to remove the
trigger plunger (37) from the trigger valve bushing (35).
The plunger can then be used to remove the Valve Bush-
ing Assembly.)
10.7 Valve cap assembly (23) and poppet valve
(21)
Remove 4 hex socket screws (9) using 6 mm Allen
wrench. Take off Grip Assembly (27), Exhaust Deflec-
tor (26), and Valve Cap Assembly (23). Remove poppet
(21) and spring (25). If necessary, remove 0-rings (18),
(22) and (24).
10.8 Piston driver blade assembly (16)
(Valve cap and poppet valve already disassembled, see
10.7) Using a replacement driver blade or an 8 mm diam-

11. Instructions for reassembly of the R4DW-X S

(Use with Exploded View Drawings (2-4) and Parts list)
NOTE: Clean all parts and check them for wear; if nec-
essary replace them before reassembly. Check all 0-
rings and lubricate them with Hilti 0-ring grease.
11.1 Bumper (12)
Insert bumper (12) into the tool and set firmly into flange
(10). Round side of bumper should be in an upwards
position as shown in diagram.
11.2 Cylinder (13) and ring assembly (20)
(Bumper already inserted, see 11.1). Install 0-rings (14),
(18) and (19) onto Cylinder and Ring Assemblies. Lubri-
cate all 0-rings and slide the Cylinder (13) and Ring
Assembly (20) together according to the drawing and
carefully press them, by hand, into the tool housing (15)
as far as they will go (approximately one inch below top
of housing).
6
Printed: 07.07.2013 | Doc-Nr: PUB / 5070502 / 000 / 00
eter x 200 mm aluminum rod, push the Piston Driver
Blade Assembly (16) carefully upwards and out of tool.
Remove 0-rings (17) using a scribe or an 0-ring pick.
10.9 Cylinder (13) and ring assembly (20)
((Valve cap, poppet valve and driver blade already removed,
See 10.7 and 10.8) Remove the cylinder (13) and cylin-
der ring (20) by inverting the tool and rapping the grip
handle (46) on the edge of a 2x4 to release cylinder and
ring assemblies. These assemblies can then be removed
by hand once ring assembly is accessible.
10.10 Bumper (12)
(Valve cap, poppet valve, driver blade, cylinder and cylin-
der ring already removed, see 10.7, 10.8 and 10.9)
Remove bumper (12).
0-ring removal and replacement instructions
Before removing an 0-ring, wipe all oil and grease from
the 0-ring area. Hold the part in one hand and with the
other hand, squeeze the 0-ring, across its outside diam-
eter, between your thumb and index finger.
Now, push outward on the 0-ring with your thumb and
index finger until the 0-ring forms a loop. Once the loop
is formed, hold onto the 0-ring and part with one hand
and then roll the 0-ring out of the groove with the oth-
er hand. When working with small diameter 0-rings,
using a pencil point or an 0-ring "pick" to get hold of the
loop works quite well.
When replacing 0-rings "roll" them onto the part and
always be sure to lubricate them with the special 0-ring
grease (Hilti #12423) prior to insertion.
11.3 Piston driver blade assembly (16)
(Bumper, cylinder and ring assembly already installed,
see 11.1 and 11.2). Replace 2 0-rings (17). Set Piston
Driver Blade Assembly (16) into the cylinder (13) and
slide it forward into the cylinder.
11.4 Valve cap assembly (23) and poppet valve
assembly (21)
(Bumper, cylinder, ring assembly, and piston driver blade
already mounted, see 11.1, 11.2 and 11.3). Replace 0-
rings (18), (22) and (24), if necessary. Important: Before
installing 0-ring (22), expand it slightly by hand. Lubri-
cate all 0-rings with Hilti 0-ring grease (#12423) before
installing cap assembly. Set poppet (21) and poppet
spring (25) into cap assembly (23). Compress poppet
to ensure freedom of movement. Set cap and poppet
assemblies into top of housing. Place exhaust deflector
(26) on cap (23) and secure with two hex head screws
(9). Install grip assembly (27) with two remaining hex