Feb 1975
SUGGESTED
CCE-IHC Pavstar F5070 On-Board Tire Inflation Methods
1. The following guidance is presented for those users that require tire inflation capability in the field.
a. Concern for safety and Department of Transportation Federal Motor Vehicle Safety Regulations require that all
auxiliary systems using air brake pressure must be safe-guarded to prevent loss of air lower than that pressure at which
effective, legal brake stopping ability is still available.
b. As a result, the air brake pressure take-off selection is limited to the two following methods:
Method 1. From the First (Wet) Air Brake Reservoir:
(a) Remove an unused plug from the reservoir and add a new pressure protection valve same as used in the
line to the air operated PTO assembly for the dump body hoist pump. The new pressure protection valve should be
bracket mounted to a rigid. member of the truck to prevent vibration. Do not install the valve in such a position that water
can enter the openings, freeze, and cause the valve to be inoperative. Orient the valve so that water will drain out.
Downstream of the pressure protection valve, install a shut-off cock and an emergency type air brake gladhand with dust
cover (per SAE 1318 preferred or, optionally MS 35746). This will provide the on-vehicle parts to connect the tire inflation
hose assembly.
(b) Obtain the same tire inflation hose, gage, and chuck assembly as on the 830-B and 290-M Medium, Rubber
Tired, 4x4 Tractors. This assembly consists of a mating gladhand a length of air hose, an inflation gage, and a captive
chained double chuck assembly compatible with both truck and bus valve stem and large bore earthmover valve stem.
(c) Connect all the on-vehicle components with the same reuseable swivel fittings and minimum 5/8 inch size
flexible hose as used on the dump truck's brake system (SAE 10ORS fittings and SAE J1402, type D, Class II, hose).
(d) A hose bracket can be fabricated from metal strapping and sheet metal and installed in the cab, either
behind the 5 driver's or the passenger's seats, for in-cab storage of the tire inflation hose and chuck assembly.
(e) This system would provide sufficient compressed air capacity for servicing the CCE-IHC dump truck as
well as other engineer vehicles in the field.
111
