hk g3 User Guide

Armorer's Manual

Instructions for Maintenance and Repair

Cal. 7.62 mm x 51

TABLE OF CONTENTS

Section 1. Maintenance Instructions……………………………………………………………………. 1 Checking the rifle before shooting – Safety engaged, rifle unloaded…………………………………... 1 Sighting-in of the rifle…………………………………………………………………………………... 3 Adjusting the rear sight…………………………………………………………………………………. 4 Checking the Head Space………………………………………………………………………………. 5 Replacing the flash hider and checking the rifle grenade for its proper seat on the rifle Replacing the cap……………………………………………………………………………………….. 6 Cleaning the barrel, cocking lever housing and magazine release lever and checking all assemblies and subassemblies for proper seat………………………………………………………………………. 7 Removing dents in receiver and cocking lever housing………………………………………………… 8 Viewing the bore for powder residues and checking the bore diameter………………………………... 9 Checking the rear and front sight, replace, if necessary………………………………………………... 10 Checking the cocking device, replace, if necessary…………………………………………………….. 11 Checking the magazine catch, replace, if necessary……………………………………………………. 12 Stripping, cleaning and checking the bolt assembly……………………………………………………. 13 Checking the firing pin protrusion……………………………………………………………………… Checking the shape of firing pin Checking the extractor protrusion………………………………………………………………………. 15 Replacing bolt components……………………………………………………………………………... 16 Replacing the locking rollers…………………………………………………………………………… 17 Replacing the bolt head locking lever…………………………………………………………………... 18 Cleaning and checking the grip assembly………………………………………………………………. 19 Cleaning and checking back plate and butt stock………………………………………………………. 20 Replacing back plate, butt stock and buffer…………………………………………………………….. 21 Replacing the recoil spring (spare parts set for back plate)…………………………………………….. 22 Checking the magazine…………………………………………………………………………………. 23 Checking the magazine housing………………………………………………………………………... 24 Checking the handguard………………………………………………………………………………… 25 Checking the carrying sling…………………………………………………………………………….. 26 Stripping the retractable butt stock……………………………………………………………………... 27 Replacing the recoil spring (spare parts set for back plate)…………………………………………….. 28 Assembling the retractable butt stock…………………………………………………………………... 29 Section 2. Spare parts…………………………………………………………………………………… 30 Section 3. Special tools, gauges and fixtures…………………………………………………………… 39

1) These instructions apply to the G3 Rifle with Fixed and Retractable butt stock.

2) These instructions contain information relating to the car, servicing and field maintenance of the

weapon.

3) Unless otherwise detailed, assembly or fitting of components or component groups is carried out in

the reverse order analogue to the relevant stripping or dismantling instructions.

4) Index number in illustrations and the text are identical to the serial numbers in the spare parts list.

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Rifle, complete

Checking the rifle before shooting – Safety engaged, rifle unloaded

Description of operation (s):

¾ Check the rifle for cleanness and proper condition. ¾ Check the rifle assemblies for proper seat. ¾ Clean the rifle (see “Technical Description of the G3 Rifle”, Sheet no. 2.2).

Weapon:

Tools:

Gauges:

Auxiliaries:

Weapons cleaning kit, 7.62 mm

Sheet No.:

1.1

Maintenance Instructions 1

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Rifle, complete

Checking the rifle before shooting – Safety engaged, rifle unloaded

Description of operation (s):

¾ Check function of cartridge feed and ejection, trigger mechanism and safety:

Pull back cocking lever which must smoothly engage in the recess in the cocking lever housing. A friction-free rearward motion of the bolt must be ensured.

When releasing the cocking lever, a practice cartridge must be properly chambered.

When pulling back the cocking lever, a practice cartridge must be properly ejected.

With the safety lever in positions “E” (single fire) and “F” (burst fire) it must be possible to squeeze the trigger and to overcome the let-off pressure without any restriction.

The safety lever must securely engage the positions “S” (safe); “E” (single fire and “F” (burst fire).

Weapon:

Tools:

Gauges:

Auxiliaries:

Use practice cartridges or deactivated cartridges

Sheet No.:

1.2

Maintenance Instructions 2

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Rifle, complete

Sighting-in of the rifle

Description of operation (s):

¾ Rifle to be sighted-in with the rear sight in position “2” at a range of 100 m. ¾ Rectify point of impact, if necessary. ¾ Elevation adjustment:

Insert elevation adjustment tool into the rear sight cylinder so that the wedges of the tool engage the two slots in the cylinder which contain the catch bolts. Press Phillips-head screwdriver downward into the adjustment tool and hold firm. Turn rear sight cylinder manually in the desired direction. Turning clockwise lowers the point of impact 3.3 cm (1.29 in.) per click at 100 m (109 yds.), turning counter-clockwise raises is correspondingly. After correction withdraw Phillips-head screwdriver and remove elevation adjustment tool. The catch will then re-engage in the slots. After performing the elevation set the desired aperture again.

¾ Windage adjustment:

Point of impact, left: Loosen clamping screw on top of sight base. Turn adjusting screw on the right side counter-clockwise in accordance with the required correction. Then retighten clamping screw. Point of impact, right: Loosen clamping screw. Turn adjusting screw clockwise until the required correction has been performed. Then retighten clamping screw.

Note: Each revolution of the adjusting screw moves the mean point of impact 13.2 cm (5.19 in.) to the left or right at a range of 100 m (109 yds.).

Weapon:

Tools:

Rear sight adjusting tool 1013 W4

Gauges:

Auxiliaries:

Sheet No.:

1.3

Maintenance Instructions 3

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Adjusting the rear sight

Description of operation (s):

Maintenance

Instructions

Part:

Rifle, complete

Weapon:

Tools:

Loosening the clamping screw

Gauges:

Auxiliaries:

Elevation adjustment

Turning the adjusting screw

Sheet No.:

1.4

Maintenance Instructions 4

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Rifle, complete

Checking the head space

Description of operation (s):

¾ Engage safety. Remove magazine.

Head space is correct when the gap between bolt head and bolt head carrier amounts to

0.1—0.5 mm (0.004—0.020 in.). It may not be possible to introduce the feeler size 0.5.

Weapon:

Tools:

Gauges:

Feeler gauge 1013 L3

Auxiliaries:

Sheet No.:

1.5

Maintenance Instructions 5

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

Weapon:

Replacing the flash hider and checking the rifle grenade for its proper seat on the rifle Replacing the cap

Description of operation (s):

¾ Loosen flash hider (2) by means of the universal spanner and remove. Screw new flash

hider onto the barrel and tighten securely.

¾ Slide control gauge over flash hider and spring ring up to limit stop at the front sight holder. ¾ Check flash hider for symmetrical seat as well as spring ring for secure seat on the barrel. ¾ Press in pressure bolt on the right side of the front sight holder and remove cap (11).

Tools:

Universal spanner 1013/41 W7

Gauges:

Control gauge 1013-100 L1

Auxiliaries:

Sheet No.:

2.1

Maintenance Instructions 6

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

Cleaning the barrel, cocking lever housing and magazine release lever and checking all assemblies and subassemblies for proper seat

Description of operation (s):

¾ Clean and oil receiver, barrel extension and barrel.

Note: When cleaning the barrel, the flash hider must be screwed onto the barrel.

Weapon:

Tools:

Cleaning rod 1013-101.49 W24 Chamber cleaning kit 1013 W3/1

Gauges:

Auxiliaries:

Gun oil, pull-throughs

Sheet No.:

2.2

Maintenance Instructions 7

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

Weapon:

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

Maintenance Instructions 8

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

Weapon:

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

Maintenance Instructions 9

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

Weapon:

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

Maintenance Instructions 10

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

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.

Weapon:

Tools:

Pin punch, dia. 5

Gauges:

Auxiliaries:

Sheet No.:

2.6

Maintenance Instructions 11

G3 Armorer’s Manual___________________________________________________________________________HECKLER & KOCH, INC.

HECKLER & KOCH

OBERNDORF/NECKAR

Designation of operation (s):

Maintenance

Instructions

Part:

Receiver with barrel, cocking lever housing and magazine release lever

Checking the magazine catch, replace, if necessary.

Description of operation (s):

¾ Check magazine catch (12) for smooth operation. ¾ Replace components, if necessary.

Weapon:

Tools:

Pin punch, dia. 2.5 Clamping sleeve retaining tool 1013-101.53 W4

Gauges:

Auxiliaries:

Sheet No.:

2.7

Maintenance Instructions 12

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