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Heckler And Koch HK UMP45, UMP40 Operators Manual

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Page 31

31
CLEANING
Normal cleaning
Performed after each firing or every twelve (12) months.
Major cleaning
Often referred to as “detailed cleaning”. Performed on an unsuppressed
UMP after 1,000 rounds (500 for a suppressed UMP) or when the
weapon is exposed to or excessively laden with sand, dust, water or
other visible contaminants or foreign matter.
• The cleaning intervals listed here are recommendations only!
• Your intervals between cleaning will vary greatly depending on many
factors to include the type...

Page 32

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UMP SUBMACHINE GUN
compressed air.
Forearm / foregripRemove any foreign debris from the forearm or
optional foregrip using a toothbrush, rag or compressed air.
Upper receiver with barrel Start with the bore and chamber.
•Bore– Apply a liberal amount of solvent to a bronze bristle bore
brush of the appropriate caliber. Always insert the bore brush from the
chamber end and push it all the way through the barrel in the direction
that the bullet travels. Pull the brush back through the barrel. DO NOT...

Page 33

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CLEANING
Bolt group
Scrub all parts of the bolt group with a toothbrush and solvent where
carbon is visible, especially around the face of the bolt and the
extractor. Do not attempt to remove the extractor for cleaning!
There is no functional need to remove the extractor for normal
cleaning. Remove the loose fouling from all parts using a rag, swabs
or compressed air.
MagazineDon’t forget the magazines! They are very important and very
often overlooked during cleaning. Many stoppages occur as a result...

Page 34

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UMP SUBMACHINE GUN
Operator inspection
During or after cleaning the operator should inspect the weapon and it’s
components for any irregularities that may causes problems during it’s
operation. If any potential deficiencies are noted, they should be
corrected immediately and/or brought to the attention of the unit armorer.
In general, the operator should keep a watchful eye out for the following
discrepancies both in the weapon as a whole and in each assembly
group.
• Improper function
• Missing...

Page 35

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LUBRICATION
• All metal accessories
Medium Lube – (finger run across surface yields some lube but lube
does not run down surface when held in a vertical position)
• Bolt group with recoil spring and guide rod
Heavy Lube – (Lube runs down surface when held in a vertical
position) No heavy lube is required on the HK UMP!
•  Reapply lubrication to the bolt of the UMP periodically during firing as
it burns off from the heat. Sound suppressed weapons generate more
smoke and noxious gases especially when...

Page 36

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UMP SUBMACHINE GUN
behind the projectile as it passes through the bore and sound suppressor
thus lowering the exit velocity of the bullet below 1,088 feet/second. 
Or two, by firing ammunition in the weapon that is down-loaded to a
velocity below the supersonic range. This is the method used in the HK
UMP submachine gun. For this reason this ammunition is termed
“subsonic” and usually falls into the range between 875 – 1,050
feet/second. Both methods are effective but each has it’s own
disadvantages...

Page 37

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SOUND SUPPRESSOR
Generally, the aluminum Bruegger & Thomet UMP sound
suppressors when used with the recommended ammunition provide
20–25 decibels (dBA) sound reduction when compared to an
unsuppressed weapon.
• An aluminum sound suppressor will generally maintain its
effectiveness to 20,000 rounds; stainless steel suppressors to 40,000
rounds or more.
•  Older sound suppressors can be replaced by the operator for a
reasonable cost. Many teams will keep the older sound suppressor for
training and...

Page 38

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UMP SUBMACHINE GUN
Ammunition
The UMP submachine gun was designed to use ammunition designed to
NATO or SAAMI specifications. Like an automobile engine, you cannot
expect top performance by using poor quality fuel. The same applies to
firearms. There are a number of general considerations that should be
made when choosing the type of ammunition you plan to use in the
UMP.
DO USE
• Ammunition of the appropriate caliber and of recent manufacture
• Clean burning ammunition
• Non-corrosive ammunition
•...

Page 39

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TROUBLESHOOTING
5. Next, determine and eliminate the cause of the stoppage. The 
items indicated in the following tables do not cover all stoppages
theoretically possible. A given stoppage may also have been caused
by other reasons than the ones indicated. 
Stoppage Cause Remedy
Cartridge not ignited Ammunition fault Recock UMP
(Dud round)
Firing pin damaged Take UMP to 
or broken maintenance shop
Hammer spring damaged  Take UMP to 
damaged or broken maintenance shop
Bolt did not stay open on...

Page 40

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UMP SUBMACHINE GUN
Stoppage Cause Remedy
No cartridge fed by bolt. Magazine not properly Insert magazine properly.
inserted.
Magazine loose Check magazine catch and 
notch on magazine. If 
required  take UMP to 
maintenance shop.
Follower spring lame Replace magazine or 
follower spring and take to
maintenance shop.
Magazine lips damaged Replace magazine or
magazine housing and 
take the damaged one to 
maintenance shop
Bolt not fully closed. Cartridge chamber dirty Clean cartridge chamber.
Cartridge...
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