MEGA Corp. MSC-OPS-1 - Manual (Page 24)

MSC/MST-OPS-1
31 Dec 2013
SECTION 2
System Description
2-15
BRAKING SYSTEM
MSC/MST PRIME MOVERS
See the prime mover Operator and Service Manual
for brake system information.
MSC/MST 611/615
See the CAT 611/615 Operator and Service Manual
for brake system information.
MSC/MST 613
See the CAT 613 Operator and Service Manual for
braking system information
MSC/MST 621H/K
See the CAT 621H/K Operator and Service Manual for
braking system information.
For further information contact MEGA Corp. Product
Support Group at:
US toll free: 1-800-345-8889
Direct: 1-505-345-2661 or visit our website at
www.megacorpinc.com for more detailed contact
information.
MSC/MST 621G & 631G
The MSC/MST rear brake system is integrated with
the existing tractor parking, service and emergency
brakes. All three systems are activated with the
existing brake controls located in the tractor cab. See
the CAT 621G and 631G operator and service manual
for additional tractor brake information.
The MSC/MST rear brake system consists of a wheel
group, two additionally air tanks, pneumatic
manifold assembly, pneumatic brake relay valve,
brake pods, solenoid valve, pressure switch, pressure
sending unit and hosing.
AIR TANKS
The MSC/MST is equipped with two 8 inch x 32 inch
air cylinder mounted to the MSC/MST rear bogie that
store 110-130 psi air. The cylinders receive
pressurized air from the tractor primary air tank
mounted under the tractor cab.
TANK PRESSURE SENDING UNIT
A 24 VDC pressure sending unit is mounted to the
rear MSC/MST air tank and is wired into existing
tractor brake pressure indicating and warning
systems. The sending unit provides air pressure
sensing for the tractor air pressure gauge mounted in
the dash. The sending unit also provides a signal to
the brake low pressure warning system that sounds
an audible warning tone when brake supply pressure
drops below allowable limits.
PNEUMATIC MANIFOLD ASSEMBLY
A pneumatic
manifold mounted
in the rear bogie
used to route air
pressure for service,
parking and
emergency brake
operation. The
manifold also
provides mounting for a check valve, parking brake/
emergency solenoid valve and parking brake
pressure switch.
CHECK VALVES
A spring operated valve allowing air flow in a
predetermined direction. A one-way check valve is
located at the MSC/MST rear air tank tractor air
supply in. A double-check valve is located on the
pneumatic manifold.