Heckler And Koch HK G3 Maintenance Instructions

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        8 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Receiver with barrel, cocking 
lever housing and magazine 
release lever Weapon: 
 
G3 
Designation of operation (s): 
 
Removing dents in the receiver and cocking lever housing 
Description of operation (s): 
 
¾  Remover dents in the receiver and cocking lever housing with straightening mandrels and 
plastic hammer. 
¾  Clamp barrel with receiver into vice and check guide in the receiver for smooth operation of 
bolt assembly by means of “GO” and symmetry gauge. 
 
 
  
 
 Tools: 
Straightening mandrel for receiver  1013-100 W6 
Straightening mandrel for cocking lever housing  1013-100 W5 
Gauges: 
“GO” and symmetry gauge  1013-01.72 L1 
 
Auxiliaries: 
 Sheet No.: 
 
2.3 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        9 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Receiver with barrel, cocking 
lever housing and magazine 
release lever Weapon: 
 
G3 
Designation of operation (s): 
 
Viewing the bore for powder residues and checking the bore diameter 
Description of operation (s): 
 
¾  Remove flash hider. Use bore scope to view barrel bore for powder residues, damages and 
rust formation. 
¾  Use caliber plug gauge to determine changes in bore diameter. 
¾  The barrel is unserviceable if the 7.69 mm caliber plug gauge can be introduced into the 
bore to a depth of more than 387 mm from the rear of the receiver. 
  
 
 Tools: 
 
 
Gauges: 
Bore scope ST 510115 – Caliber plug gauge 1013-01.89 L11/1 with barrel 
cleaning rod L11/2 – “NO GO” gauge for barrel 1013-01.89 L11 
Auxiliaries: 
 Sheet No.: 
 
2.4 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        10 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Receiver with barrel, cocking 
lever housing and magazine 
release lever Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the rear and front sight, replace, if necessary 
Description of operation (s): 
 
¾  Check rear sight cylinder for smooth operation and secure seat. 
¾  Figures must be clearly legible. 
¾  If necessary, replace rotary rear sight (3) (spare parts set 4). 
¾  Check if front sight (21) is securely seated in the front sight holder, if necessary, replace 
front sight. 
 
Note:  After replacing rear sight components, the rifle has to be sighted-in (see sheets 1.3 
and 1.4). 
 
  
 
 Tools: 
Pin punch, dia. 3.5 
Clamping sleeve retaining tool  1013-101.53 W1 
Rear sight adjusting tool  1013 W4 
Gauges:
 
 
 
Auxiliaries: 
 
Sheet No.: 
 
2.5 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        11 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Receiver with barrel, cocking 
lever housing and magazine 
release lever Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the cocking device, replace, if necessary 
Description of operation (s): 
 
¾  Check cocking device for damages. 
¾  Check serviceability of cocking lever (17) and cocking lever support (18). 
¾  Check locking lever elbow spring (19) for distortion and spring resistance. 
¾  Replace components, if necessary. 
 
  
 
 Tools: 
Pin punch, dia. 5 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
2.6 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        12 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Receiver with barrel, cocking 
lever housing and magazine 
release lever Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the magazine catch, replace, if necessary. 
Description of operation (s): 
 
¾  Check magazine catch (12) for smooth operation. 
¾  Replace components, if necessary. 
 
 
 
  
 
 Tools: 
Pin punch, dia. 2.5 
Clamping sleeve retaining tool  1013-101.53 W4 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
2.7 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        13 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Bolt assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Stripping, cleaning and checking the bolt assembly. 
Description of operation (s): 
 
¾  Strip the bolt assembly. 
¾  Clean the bolt components. 
¾  Check bolt components (23-26) for damages, dents and wear, replace, if necessary             
(see sheet 3.4). 
¾  Oil bolt components. 
¾  Reassemble bolt assembly. 
 
 
 
 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
Gun oil Sheet No.: 
 
3.1 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        14 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Bolt assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the firing pin protrusion 
Checking the shape of firing pin 
Description of operation (s): 
 
¾  To measure the firing pin protrusion, both firing pin (24) and locking piece (23) must be 
introduced entirely into the bolt head (26) so that the firing pin protrudes at the bolt face. 
¾  The “GO” side of the gauge is place on the firing pin. The front measuring flat side must 
rest on the bolt face. 
¾  The firing pin protrusion is correct if the “GO” size is 1.14—1.60 mm. 
¾  Check the shape of the firing pin as shown in the figure below. 
 
  
 
 Tools: 
 
 
Gauges: 
Limit gauge for firing pin protrusion  1013-02 L3 
 
Auxiliaries: 
 Sheet No.: 
 
3.2 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        15 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Bolt assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Checking the extractor protrusion 
Description of operation (s): 
 
¾  Introduce extractor protrusion gauge into bolt head below extractor claw. 
¾  The extractor protrusion is correct when the “GO” side of the gauge can smoothly be turned 
under the extractor claw. 
 
 
 
 
  
 
 Tools: 
 
 
Gauges: 
Extractor protrusion gauge  1013-02.06 L2 
 
Auxiliaries: 
 Sheet No.: 
 
3.3 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        16 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Bolt assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Replacing bolt components 
Description of operation (s): 
 
¾  Strip bolt assembly. 
¾  Assemble new bolt components (see 3.5 and 3.6). 
 
Note:  To remove the extractor spring, insert a pointed metallic object into the opening, using 
the metallic object to slightly lift and press forward the extractor spring. 
 
                          Removing extractor spring         Fitting extractor spring 
 
  
 
 Tools: 
 
 
Gauges: 
 
 
Auxiliaries: 
 Sheet No.: 
 
3.4 
  
						

							G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC. 
 
 
                                                   Maintenance Instructions                                                        17 
HECKLER & KOCH 
 OBERNDORF/NECKAR 
Maintenance 
Instructions
 
Part: 
 
Bolt assembly Weapon: 
 
G3 
Designation of operation (s): 
 
Replacing the locking rollers 
Description of operation (s): 
 
¾  Punch out clamping sleeve (31) from bolt head (26) 
¾  Remove holder for locking rollers (30) and locking rollers (29) from bolt head. 
¾  Insert locking rollers and holder into bolt head. 
¾  Place bolt head in assembly fixture so that the face of the bolt head comes to rest at the 
clamping sleeve. 
¾  Insert new clamping sleeve into bolt head and drive in. 
 
  
 
 Tools: 
Assembly fixture  1013-02.06 V1 
Clamping sleeve retaining tool  1013-02.06 W2, pin punch, dia. 2 
Gauges: 
 
 
Auxiliaries: 
Hammer Sheet No.: 
 
3.5