SIG SAUER SWISS ARMS SG552 - Manual (Page 22)

4.1.3. Cleaning after malfunctioning
The SG 552 must be cleaned whenever the gas valve is
switched to position II. After cleaning, all moving parts
should be lubricated and a light coat of oil applied to all
steel parts to prevent rusting.
Sequence of operations:
1) Set the safety lever to “S“
2) Unload the weapon
3) Withdraw the rear trigger casing stud to the stop
4) Fold down the trigger casing, clean and check
5) Remove the bolt with gas piston, clean and check
6) Remove the gas valve, clean and check
7) Clean the receiver
8) Oil all parts in accordance with section 4.2.6
9) Assemble weapon in reverse sequence
10) Carry out function check
11) Load and continue with assignment
4.2. Cleaning and lubrication procedures
4.2.1. Prior to firing
The barrel should be checked and cleaned prior to firing.
4.2.2. After firing
After firing the barrel should be cleaned with at least ten
strokes of the oiled dry barrel brush. This should be car-
ried out from the chamber down and whenever possible
while the barrel is still warm. In this way, residual powder
can be softened, thus preventing rusting.
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Maintenance
4. Maintenance
4.1. Types of maintenance
There are the following types of maintenance:
• daily cleaning
• cleaning after firing
• cleaning after malfunctioning
4.1.1. Daily cleaning
Daily cleaning should be carried out if the weapon is dry
and has not been fired.
Sequence of operations:
1) Unload weapon
2) Clean the weapon externally
3) Lightly oil steel parts (to prevent rusting)
4) Carry out function check in accordance with section 3.16.
4.1.2. Cleaning after firing
Sequence of operations:
1) Unload weapon
2) Field strip the weapon (see section 3.14.)
3) Clean and lubricate the weapon as described in the
cleaning an lubrication procedures in section 4.2.
4) Assemble weapon
5) Carry out function check in accordance with section 3.16.
Maintenance
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