Hilti R4DW-X S, Operating Instructions Manual, Page: 8 / 36

5
e n
Air Leaks
— at Valve Cap Assy (#23) Valve ring 0-ring (#24) damaged or Fit 0/H Kit #12552
worn
Valve Cap 0-ring (#22) and/or (#18)
Fit 0/H Kit #12553
damaged or worn
— from trigger valve 0-ring (#36) and/or (#38) worn or Fit 0/H Kit #12557
bushing assy (#35) damaged
— at Trigger Valve Piston 0-rings (#38) damaged or worn Replace 0-rings. Fit 0/H Kit #12557
(#37)
— between grip (#40) and Gaskets damaged Replace gaskets (#42)
grip cover (#45) Screws (#58) loose Tighten screws
— at Safety Valve (#54) 0-rings (#55) damaged or worn Fit 0/H Kit #12652
Piston Assy Trigger valve body 0-rings damaged Fit 0/H Kit #12554
Trigger valve body defective (#56) Replace trigger valve body assy.
— at nosepiece (#8) nail Damaged bumper (#12) Replace bumper (#12) as necessary
exit 0-ring (#14) damaged or worn Replace 0-ring. Fit 0/H Kit #12552
0-rings (#18, #19) damaged or worn Replace 0-ring. Fit 0/H Kit #12552
Tool will not fire Air pressure too low Check air source, regulator setting gauges,
hoses, fittings, etc.
Safety yoke (#1) stuck in down Check for dirt or obstructions Replace
position safety if deformed
— Driver Blade Assy (#16) Nails jammed in nosepiece (#8) Clear jammed nail
stuck down Inspect Driver Blade and Nosepiece
Bent Driver Blade Replace Driver Blade Assy (#16)
0-rings (#17) damaged or worn Fit OH Kit #12657
Bumper (#12) severely damaged Replace bumper
Defective trigger valve body (#56) Replace trigger valve body assy
10. Instructions for disassem b ly of R4DW-X S — Internal working parts
(Use with Exploded View Drawings (2-4) and Parts list)
NOTE: Before starting on the disassembly of the tool,
disconnect the tool from the air supply and remove all
fasteners from the magazine assembly. If handle grip
(40), plate (46), flange (10), and valve bushings (52, 59)
require service, contact your Hilti Representative.
10.1 Magazine assem b ly (48 )
Release 2 nuts (66) using a 17 mm open end wrench
and 5 mm Allen wrench. Remove hex socket screws
(29) and washers (61). Position pusher (47) in forward
position and remove magazine assembly (48) from nose-
piece (8).
10.2 Pusher (47 ) and grip (63 )
Using a 2 mm pin punch, drive out spring pin (62).
Remove pusher (47) from magazine (48) by sliding for-
ward and away from magazine. Pull back grip (63) slight-
ly, align grip pin (65) with detents in magazine and tilt
back portion of grip up. Once grip pin (65) is clear of
magazine, tilt the grip (63) up and forward to clear the
scroll spring. If necessary, tap grip pin (65) out of bush-
ing (64) and grip (63). If the scroll spring (51) requires
replacement, contact your local Hilti Representative.
10.3 Safety yoke (1 )
Remove 2 hex locknuts (3) using a 10 mm open end
wrench and take off guide plate (2). Remove the safety
return spring (4). Remove the hex socket screw (5) clos-
est to Valve Piston Assembly (54) using a 5 mm Allen
wrench. It is not necessary to remove the nosepiece (8).
Slide out safety yoke (1) from Safety Valve Piston Assem-
bly (54).
Printed: 07.07.2013 | Doc-Nr: PUB / 5070502 / 000 / 00