OO-M-2888
the mixing drum. The tank shall be equipped with an indicator, calibrated in gallons or liters, to indicate the quantity of water used per batch. The indicator shall be easily visible to the operators normal operating location.
3.11 Water pump. Mixers shall be furnished with a self-priming centrifugal pump for filling the water measuring tank, from a water source not less than 5 feet (1.5 m) below the pump centerline. The water pump shall be furnished with 25 feet (7.62 meters) of wire reinforced suction hose with a nominal inside diameter the same size as the pump inlet. One end of the suction hose shall be equipped with a removable strainer.
3.12 Skip loader. The skip loader shall be of the closed end type with capacity of at least 10 percent greater than the batch capacity of the mixer. The hoist clutch shall automatically disengage when the skip loader reaches the fully raised position. The loader shall be capable of being held stationary at any position anywhere from ground level to the fully raised position without slipping. The loader shall hold its position in case of accidental engine shutdown and shall be able to be lowered safely to the ground manually. Means of securing the loader in an upright position when being transported shall be provided. A mechanical shaker shall
automatically operate when the loader discharges the batch load into the drum mixer. The shaker shall clear the skiploader of all aggregates while in the dump cycle.
3.13 Discharge chute. The discharge chute shall be fabricated from steel with sufficient thickness to provide an estimated service life of not less than 4,000 hours of continuous operation. The chute shall be self-locking when in the mixing or discharging cycle.
3.14 Engine. The engine shall be the manufacturer's standard air or liquid cooled gasoline or diesel engine for the mixer size as specified herein. Engine shall be protected with metal cover. Engine accessories shall include, but not limited to, the following:
a. Fuel tank, with level indicator, providing capacity for not less than 6-hours continuous operation with diesel engines and 3 hours with gasoline engines.
b. An instrument and control panel including a starter switch, an hour meter, and a coolant temperature for liquid cooled engine.
c. A corrosion resistant exhaust system, designed to prevent rain intrusion.
3.14.1 Electric cranking system. The engine cranking shall be from a 12-volt battery. When specified (see 6.2), the battery shall be dry charged type, conforming to SAE J537, without electrolyte, with sealed caps to prevent moisture intrusion. Battery shall be enclosed in a weather- proof metal enclosure.
3.15 Operating controls. Operating controls for aggregate loading, adding water, and discharging operation shall be located on the same side of the mixer.
3.16 Power transmission. Power transmission from engine to mixing drum (reduction gears, chain drives, clutches) shall be safety protected in conformance to OSHA 29 CFR 1926.
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