MEGA Corp. MHT175-CAT777-OPS-1 - Manual (Page 12)

MHT175-CAT777(G)-1
1 Aug 2012
SECTION 2
System Description
2-4
Electronic
The system consists of a roller switch mounted
on the hitch retaining plate and a warning box
located in the cab. The roller switch is
activated by flags mounted on the underside of
the ball skirt disc. When the trailer rotates
about 85° either side of center trail, the flag
will activate the switch in turn providing
power to activate the amber warning light and
audio horn on the warning box. The system
receives 24 VDC switched power from the
tractor.
MHT BRAKE SYSTEM
The MHT rear axle braking is integrated with
the existing CAT 777G tractor service,
secondary and parking brakes systems. MEGA
has added an additional scavenge pump one
additional accumulator (trailer mounted) a
modified brake valve and several restrictors
within the brake system to acquire a fully
functional cooling and activation system.
The trailer brake activation is accomplished
with existing in-cab service brake pedal,
secondary brake control pedals as well as the
gear shift lever for parking brake.
Deceleration of the vehicle from running/
operating speed is typically accomplished by
using the retarder. Always consider road
conditions
(wet, icy or slick) when
determining a means to decelerate or stop.
MHT Service Brakes
The tractor and MHT service brakes are
activated by pressing on the brake control
pedal. Pilot (signal) pressure from the tractor
proportions brake valves allowing accumulator
activation pressure to be routed to the slack
adjusters and apply the brakes.
Accumulators
The MHT is equipped with one additional
accumulators mounted on the trailing axle
frame that ensure brake activation pressure is
available in close proximity to the rear axle
brakes
Retainer Mounted Roller
Switch
In-Cab Mounted Warning
Box