XX-D-370D
3.6.7 Gaskets and packing. When tested as specified in 4.5.2.3, the pump unit shall be equipped with gaskets and packing that will insure against leakage.
3.6.8 Plunger. The plunger assembly shall consist of a plastic or leather ring suitably supported with valve or valve action, and shall be securely attached to the pinion rack.
3.6.9 Rack and pinion drive. A suitable rack shall be employed to operate the plunger. The rack shall be a commercial design and shall be tapped or threaded to receive the plunger rod or piston assembly. The teeth shall be of such construction and hardness to assure strength to handle the necessary load. The pinion gear shall be either machined to slide over the pinion shaft or shall be constructed integral with the shaft. The ends of this shaft shall be squared or suitably arranged to receive the crankhandle. The pinion gear shaft shall be removable from the head casting. A suitable packing box or other sealing means shall be employed to insure that no leaks develop around the pinion shaft on the outside of the head casting.
3.7 Detailing of technical requirements.
3.7.1 Priming. The pump unit shall be self-priming. The crank shall be of such design that it may be stopped anywhere on the up or down stroke.
3.7.2 Drip control. The pump unit shall be equipped with a spring-loaded return drip tube which is easily turned aside and which shall return automatically to position under the filler spout or the pump shall be equipped with a return drain pan with a hinged cover to protect the liquid from foreign material or a nondrip shut-off spout with an internal drain back device to allow the- pump handle to be returned to a vertical position (see 6.2.1).
3.7.3 Capacity. The pump shall be provided with an adjustment screw with locking device to regulate the capacity by varying the length of stroke. When tested as specified in 4.5.2.3, the pump shall be capable of delivering not less than 2 gallons per minute of SAE 30 lubricating oil when operating the pump 8 cycles per minute. A cycle shall consist of one complete downstroke and one complete upstroke of the piston.
3.7.4 Air leakage. When tested as specified in 4.5.2.4, the pump shall show no evidence of air leakage.
3.7.5 Weight. The-complete pump unit, including the intake fittings discharge pipe, faucet, suction pipe, handle and all accessories, shall weigh not more than 40 pounds.
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