Proto MATRIX M7 Owner's Manual page 7

LPR (LOW PRESSURE REGULATOR)
ADJUSTMENTS AND MAINTENANCE
5
7
9
6
8
LPR ASSEMBLY, CLEANING, TESTING AND CHANGING SEALS
The Low-Pressure Regulator (LPR) is located in the lower front of the M7 (see figure 1). The
function of the LPR is to lower the air pressure supplied to the marker by the in-line, before
it reaches the solenoid. This pressure is used to move the bolt forward and back. The
factory setting is 75 PSI. You can fine tune your M7 to its minimum cycle pressure. This will
reduce the amount of force of the bolt hitting the ball (reducing ball breaks) and help with
efficiency. Too low of pressure will cause the bolt to not cycle, move sluggishly or not at all.
If you experience dramatic shoot down during rapid fire, the LPR may be adjusted too low.
Too high of pressure will cause the marker not to shoot as smoothly, potentially increase ball
breakage and cause undue wear and fatigue on the bolt components.
It is important to keep the seat and piston face clean of all dirt and debris. Clean the seat
and piston face and grease the retainer o-ring every six months or 60,000 shots.
Figure 1
The LPR has five components and six seals
1 Piston large o-ring (012 BN70) 6 Piston small o-ring (006 UR90)
2 Piston
W A R N I N G
3 Piston spring
4 Body
5 Body o-rings (4pcs, 012 BN70)
When servicing your marker: The only user-serviceable part in the LPR is the seal retainer. This seal needs to be changed
in the unlikely case the LPR is creeping up.
• Make sure your hopper is removed
from the M7.
• Make sure there are no paintballs in the
breech of the M7.
• Always remove the air supply and
relieve all gas pressure in the M7
before disassembly.
• It is not recommended for the user to
remove the LPR from the body and
disassemble it.
W W W . P R O T O
5 5 5
3
2
4
7 Main seal (mounted in the seal retainer)
8 Seal retainer o-ring (010 BN70)
9 Seal retainer (functions as an adjustment screw also)
P A I N T B A L L . C O M
CHANGING THE SEAL RETAINER
1 Screw out LPR cap in front of the marker using a 1/4" Allen wrench.
2 Screw out LPR seal assembly (brass) using a 3/16" Allen wrench.
3 Screw in new LPR seal assembly.
1 4 Screw LPR cap in place securely.
If the user needs to replace the whole LPR assembly, follow these instructions (refer to
figure 2):
1 Remove the air supply and relieve all gas pressure from the M7.
2 Take the Hyper2 Regulator off the marker (see page 12).
3 Screw out LPR set screw using a 5/64" Allen wrench.
4 Screw out LPR cap using a 1/4" Allen wrench.
5 Pull out the LPR by screwing a rod with a 10/32 thread into the seal retainer
(brass piece) inside the LPR and pulling it out.
6 Put everything back in reverse order. Be sure to grease the #012 o-rings, so as to
prevent cutting them upon installation.
7 Tighten LPR cap securely.
The LPR pressure can be set quite accurately even without an LPR test tool. Screwing the
adjustment screw (seal retainer) all the way in will set the LPR pressure to approximately
25 psi. Now turning out the adjusting screw 180 degrees will increase the pressure by
approximately 5 psi. For example, turning the screw 5 complete turns out will set the
pressure to approximately 75 psi. Use a 3/16" Allen wrench to make all adjustments to the
LPR. Turning the adjustment screw clockwise, or in, will lower the LPR's output pressure.
Turning the adjustment screw counterclockwise, or out, will raise the LPR's output
pressure.
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LPR (LOW PRESSURE REGULATOR)
ADJUSTMENTS AND MAINTENANCE
W . P R O T O P A I N T B A L
Figure 2
L . C O M