Heckler And Koch HK G3 Maintenance Instructions

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        18 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Bolt assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Replacing the bolt head locking lever 
Description of operation (s): 
 
¾  Punch out cylindrical pin (34) from bolt head carrier. 
¾  Remove bolt head locking lever (32) and its compression spring (33). 
¾ Insert new components. 
 
 
 
  
 
 Tools: 
Backing-out punch, dia. 4 
Pin punch, dia. 4 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
3.6 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        19 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Grip assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Cleaning and checking the grip assembly 
Description of operation (s): 
 
¾  Remove trigger housing (40) from pistol grip. 
¾  Take off grip (36), by removing screw (37) and washer (38). 
¾  Clean trigger housing and pistol grip. 
¾  Check components for damages, dents and wear. 
¾  Replace components, if necessary. 
¾ Oil components. 
¾  After reassembly, check trigger mechanism and safety for smooth operation. 
 
 
  
 
 Tools: 
Screwdriver, 7 x 140 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
4.1 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        20 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Back plate with butt stock Weapon: 
 
G3 
Designation of operation (s): 
 
Cleaning and checking back plate and butt stock 
Description of operation (s): 
 
¾  Clean back plate with butt stock. 
¾  Check for damages, dents and wear. 
¾  Check recoil spring guide rod for secure seat. 
¾  Check recoil spring stop pins and rivets for secure seat. 
¾  Check recoil spring guide ring for smooth operation. 
¾  Check buffer for secure fastening in the back plate and butt stock. 
¾  Check butt plate for secure seat. 
¾  Oil operational components. 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
Gun Oil Sheet No.: 
 
5.1 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        21 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Back plate with butt stock Weapon: 
 
G3 
Designation of operation (s): 
 
Replacing back plate, butt stock and buffer 
Description of operation (s): 
 
¾  Remove butt plate (50) and replace, if necessary. 
¾  Unscrew buffer (44) and replace, if necessary. 
¾  Replace, if necessary, back plate (43) and /or butt stock (42). 
 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
5.2 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        22 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Back plate with butt stock Weapon: 
 
G3 
Edition: 
1a/TD2312
Designation of operation (s): 
 
Replacing the recoil spring 
(Spare parts set for back plate) 
Description of operation (s): 
 
¾  Punch out rivets (55) of the recoil spring guide rod which is part of the back plate (43). 
¾  Remove stop pin (53), recoil spring guide ring (54) and recoil spring (51). 
¾  Slide new recoil spring with its guide ring onto recoil spring guide rod. 
¾  Insert back plate in the assembly fixture. 
¾  Slide compression tube onto recoil spring guide rod and clamp compression tube. 
¾  Fit stop pin and both rivets into recoil spring guide rod. 
¾  Swivel down recoil spring guide rod so that is comes to rest on center and punch-in rivets. 
 
 
  
 
 Tools: 
Assembly fixture 1013-04.21 V2 
Center punch, dia. 10 
Hammer 
Gauges: 
 
 
Auxiliaries: 
 
Sheet No.: 
 
5.3 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        23 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Magazine Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the magazine 
Description of operation (s): 
 
¾  Clean and oil magazine. 
¾  Check for damages, dents, serviceability of the follower, correct position of cartridges in the 
magazine lips, floor plate for secure seat, if magazine is securely seated in the magazine 
catch. 
 
 
 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
Gun Oil Sheet No.: 
 
6.1 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        24 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Magazine Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the magazine housing 
Description of operation (s): 
 
¾  Strip and clean magazine. 
¾  Check free travel of follower and resistance of follower spring. 
¾  Check magazine housing with calibrating mandrel and remove dents. 
¾  Oil magazine housing and magazine components. 
Note:  The use of the appropriate calibrating mandrel depends on the design of the magazine      
housing (steel or aluminum). 
 
  
 
 Tools: 
Calibrating mandrel for magazine housing 1015-11 W3 (Aluminum) 
                                                                    1015-10 W3 (Steel) 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
6.2 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        25 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Handguard Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the handguard 
Description of operation (s): 
 
¾  Check the handguard. 
¾  Check for damages and cracks. 
¾  Check locking pin for secure seat. 
¾  Check handguard for secure seat. 
 
 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
7.1 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        26 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Carrying sling Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the carrying sling 
Description of operation (s): 
 
¾  Clean the carrying sling. 
¾  Check sling for damages, brittleness and function. 
 
 
 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
8.1 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        27 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Retractable butt stock Weapon: 
 
G3 
Designation of operation (s): 
 
Replace the recoil spring 
Stripping the retractable butt stock 
Description of operation (s): 
 
Stripping the retractable butt stock. 
¾  With the butt stock in retracted position, remove snap ring (6), locking ring (5) and clamping 
lever (4). 
¾  Remove butt stock (7), protective cover (3) and gripping lever (2) from the back plate (1). 
 
  
 
 Tools: 
Screwdriver 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
9.1