FUSE
™
BOLT
- Assembly and Maintenance (continued).
FUSE
™
BOLT
- Assembly and Maintenance.
BOLT MAINTENANCE
Regular DM4 bolt kit maintenance is vital to the performance of the DM4.
If the bolt kit is not kept well-greased and the o-rings in good shape, the performance of the DM4 will be greatly hindered.
To remove the bolt, you will need a 1/4“ Allen wrench. Unscrew the bolt from the rear of the marker. It only takes one and one half revolutions to unscrew the bolt so that it can be pulled out.
After the bolt has been cleaned and greased and is ready to be inserted into the body, be sure all bolt sleeve components are screwed together snugly. Slowly push the bolt into the body. Take care
not to cut or nick the o-rings as they pass the threads.
GREASE THE MATRIX BOLT KIT EVERY 10-15 THOUSAND SHOTS.
BEFORE INSTALLING THE BOLT INTO THE MARKER, BE SURE ALL BOLT SLEEVE COMPONENTS ARE SCREWED TOGETHER SNUGLY
If you do not grease the bolt, you will run the risk of damaging o-rings. This will create excessive friction and drag on the bolt, ultimately resulting in breaking the bolt. When greasing the DM4 bolt
kit, pay special attention to all o-rings that are on the bolt and that ride on a surface of the bolt. The first seven o-rings listed below should be generously greased during maintenance.
FUSE BOLT O-RING LIST
1
Bolt tip (014)
2
Bolt sail (015)
3
Inside bolt stem (009)
4
Rear bolt stem (009)
5
Front wall internal (017 UR70)
6
Top hat (017 UR70)
7
Top hat (013)
8
Outer sleeve (020)
9
Front bumper (015)
10 Rear bumper (111)
NOTE: All remaining o-rings should have a thin coating of grease as well.
FUSE BOLT OPERATION
To achieve top performance from your DM4, it is
important to understand the basic operation of the DM4’s
patented FUSE bolt system.
This design consists of three sleeves threaded together to
capture the only moving part of the system, the bolt.
The FUSE Bolt has four components
1
Cylinder
2
Bolt
3
Top Hat
4
Rear Cap
Air is supplied to the bolt at two points. A high-pressure
supply of air is routed to the back of the bolt into the
supply chamber. This air source is responsible for
propelling the ball. Low-pressure air is supplied from the
LPR to the solenoid. From the solenoid, the air is routed
through two small holes to the section of the bolt referred
to as the cylinder.
When the DM4 is aired up, air is transferred by the
solenoid to the front of the cylinder. This air pushes against the bolt sail and the bolt is held in the back position. When the bolt is
held back, the 013 o-ring in the top hat seals around the bolt and contains the air in the supply chamber.
When the marker is fired, the micro switch is pressed, telling the solenoid to switch the flow of air from the front of the cylinder to
the rear of the cylinder. Air that enters the rear of the cylinder will push on the bolt sail, moving the bolt forward. The air in the
front of the cylinder is vented.
As the bolt moves forward, the tapered stem passes through the top hat. Once the bolt stem can no longer seal against the 013
o-ring, the air contained in the supply chamber is released. The air passes through the venturi ports in the bolt and out the front of
the bolt to propel the ball. When the bolt is in the forward position, the inside bolt stem o-ring prevents the flow of air from
continuously flowing through the marker when the bolt is forward. This helps the marker shoot much more efficiently.
NOTE: LOW OR ERRATIC VELOCITY MAY BE DUE TO A LOW BATTERY NOT SUPPLYING
AMPLE ELECTRICAL CURRENT TO THE SOLENOID. IN THIS CASE, CHANGE THE BATTERY.
When servicing your marker:
• Make sure your hopper is removed
from the DM4.
• Make sure there are no paintballs in the
breech of the DM4.
• Always remove the air supply and
relieve all gas pressure in the DM4
before disassembly.
• When using the DM4 in temperatures below
50º, it may be necessary to lube the FUSE
bolt more frequently.
Figure 1
W A R N I N G
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8
8
8
FORWARD POSITION
BACK POSITION
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4
8
9
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C
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