Heckler And Koch HK UMP45, UMP40 Operators Manual

21
LOADING THE SUBMACHINE GUN
Starting Situation 2: There is an empty magazine in the weapon.  
The bolt is held back by the bolt catch.
• Put the UMP on  (Safe).
• Push magazine catch forward and remove empty magazine.
• Insert the filled magazine into the magazine well until the magazine
catch engages audibly. Tug to check.
• Depress upper end of bolt catch (Fig. 25), thus releasing the bolt and
allowing it to snap forwards. 
• The UMP is now fully loaded and with the safety on.
FIg. 25  Depress bolt...

22
FORWARD ASSIST
With heavy external fouling of the UMP, (sand, sludge) or to load the
weapon quietly, the thumb recess on the bolt may be used as a forward
assist (Fig 25A). To do so use the thumb recess, push bolt forwards
until it is in the forward most position.
FIg. 25A Forward Assist  

23
STORAGE OF THE WEAPON
1. Store the weapon clean and lubricated.
2. Store the weapon without a round in the chamber.
3. Store the weapon with the cocking lever forward and the hammer
down (at rest).
4. After no more than twelve (12) months unload all loaded magazines
and replace the ammunition with fresh ammunition.
5. Clean and lubricate the weapon and magazines every twelve (12)
months while in storage.
6. Store the weapon is a clean, dry environment with regulated
temperature controls. 

24
UMP SUBMACHINE GUN
Disassembly of the UMP
NOTE: The UMP is disassembled and reassembled without the use
of tools. The use of force is prohibited. The user of this weapon is
not allowed to disassemble the weapon beyond that which is
covered in this operators manual. Such disassembly may only be
carried out by qualified maintenance personnel. 
Safety check 
• Put the UMP on “Safe”.
• Remove the magazine.
• Pull cocking lever backwards as far as it will go and engage it in the
indent in the cocking...

25
DISASSEMBLY
• Fold buttstock. 
• Pull back cocking lever and remove recoil spring assembly with bolt to
the rear (Fig. 27).
Fig. 27 Removing recoil spring assembly with bolt  

26
UMP SUBMACHINE GUN
Disassembly of the Bolt 
• Push and hold firing pin forward.
• Pull out firing pin retaining pin to the left (Fig. 28). 
•  Remove firing pin and firing pin spring to the rear. To do this, push
locking catch to the right (Fig. 29).  With your thumb prevent the firing
pin with firing pin spring from springing out. 
Fig. 28                                       Fig. 29
Pull out firing pin retaining pin    Push locking catch to the right
WARNING: Never disassemble the firing pin. It is...

27
DISASSEMBLY
Disassembly of the Magazine 
• Depress locking plate through magazine floor plate and slide
magazine floor plate to the rear. 
• Detach magazine floor plate to the rear. 
• Remove follower spring with locking plate and follower.
CAUTION: Magazine floor plate is under spring tension. With your
thumb secure locking plate with follower spring to prevent it from
springing out. 
Assembly of Magazine 
• Insert follower and follower spring with locking plate into the
magazine housing from below....

28
UMP SUBMACHINE GUN
Reassembly of the UMP
• Fold buttstock. 
• Insert the bolt and recoil spring assembly to the receiver from the rear.
• Unfold buttstock. 
• From below, engage lower receiver (hammer between cocked and
released positions) into the support bolts on the upper receiver and
swivel it upwards (Fig. 32).
• Insert locking pin into the upper receiver to secure lower receiver.
• Put the UMP on   (Safe). 
• Insert empty magazine.
• Carry out a function check as described on page 30 (cock,...

29
FUNCTION CHECK
NOTE: A Function Check should be performed anytime the weapon
is reassembled. This quick check indicates whether or not the
weapon has been properly assembled and/or assembled with all
components. A properly executed Function Check can also reveal
many of the more obvious malfunctions that could occur between
the interactive components of the weapon. ALWAYS clear the
weapon before performing the Function Check! ENSURE the
weapon is clear!
1. Clear the weapon.
2. Place the cocking lever...

30
UMP SUBMACHINE GUN
Operator Cleaning
• The functional performance of any mechanical device varies greatly
on the quality and frequency of the maintenance performed on that
item. Firearms are no exception. The operator spends most of the
time with the weapon and therefore has the best opportunity to
perform the necessary upkeep required to insure top performance at
all times.
• Metal components of new UMPs are coated in a thick, oily
preservative that should be removed prior to the weapon being used
or...