Specifications

Proposal Number PSDF #P09-0004
AXLE DIFFERENTIAL LUBE
The axle shall have the initial factory fill made with non-synthetic axle lube meeting the axle manufacturer's
recommendations.
REAR AXLE OIL SEALS
The rear axle shall be equipped with premium oil bath type oil seals as supplied on the axle from the axle
manufacturer.
TANDEM REAR AXLE DISC BRAKES
MERITOR/ROCKWELL DiscPlus, EX-225, air disc brakes shall be installed on the Meritor/Rockwell
tandem rear axle. The DiscPlus air disc brakes shall provide improved fade resistance and wet weather
performance. The rotors shall be vented to facilitate brake cooling.
These brakes shall be rated at a maximum of 54,000# capacity on a tandem rear axle assembly.
TANDEM AXLE REAR SUSPENSION
The actual rear suspension shall be determined by the manufacturer based of calculated load and allowing
1500 lbs for personnel and equipment in the cab and 8,000 lbs in body for equipment, hose etc.
TANDEM AXLE REAR SUSPENSION - RATING
The tandem axle suspension shall have a rated capacity of 52,000 lbs. The suspension shall be provided with
bronze center bushings and rubber end bushings.
The walking beams for the tandem axle suspension shall be 54 inches in length.
REAR TIRES
The rear tires shall be 12R22.5-16PR (H) GOODYEAR UNISTEEL G149 RSA highway tread, tubeless
radial tires. These tires shall be mounted on 22.5" x 8.25" rims polished aluminum wheels with Dura Bright
finish.
Stainless steel "Lincoln Hat" hub cover and bright finished nut covers.
Tandem rear axle GAWR using these tires shall be 54,000 lbs. @ 120 psi.
AIR SYSTEM
An air brake system meeting the requirements of the FMVSS-121 shall be provided. The system shall
consist of four (4) reservoirs with a 6,543 cu. in. volume. One (1) 2,181 cu. in. additional reservoir shall be
connected to the chassis air system to provide an air supply for accessories such as air powered tools. This
reservoir shall include a pressure protection valve on the inlet side to allow full use of this tank without
draining air from the chassis air system. Total air reservoir must be a minimum of 8,700 cu.in.
A quick build up system shall be provided, capable of building enough air pressure to release the spring
brake in less than thirty (30) seconds, when starting with the entire air system at zero pounds pressure.
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