Concentric AB-F20/F30 PMP-2011-06 2 Reliable, efficient, serviceable design Concentric external spur gear, positive displacement pumps are offered in single, double, triple and thru-drive versions. Single and thru-drive pumps are of a three-section modular design. Front and rear covers are cast iron for reliability, strength, and sound reduction. A cast iron center section allows gear tips to generate their own run-in paths, creating minimum radial gear-tip clearance for high volumetric efficiency. The thru-drive pump is a single pump with a mounting pad and coupling spline in its rear cover, allowing a second pump to be mounted and driven in tandem. The double pump consists of two single pumps, each having its own outlet port but sharing a common inlet port and input shaft. This compact unit can, therefore, serve two separate hydraulic circuits, or supply greater volume to a single circuit through the combined delivery of both pumps. Besides offering greater design flexibility to hydraulic system designers, thru-drive and double pumps reduce installation costs since they allow multiple pump operation from a single mounting and drive point. Also, double pumps require only one inlet line, compared to the two required when separate pumps are used. Convenient, economical porting arrangements A large selection of port sizes and positions allows greater system design flexibility, provides the means for reducing costs through simplified plumbing arrangements, and facilitates the interchangeability of Concentric and competitive pumps. SAE 4-bolt split flange ports and SAE straight thread ports are standard. Choice of shafts, rotation and couplings Splined SAE side-fit drive shafts are standard. Other popular shafts are available. Pumps are assembled for either clockwise or counterclockwise rotation. Thru-drive pumps are provided with output drive couplings that mate with splined SAE side-fit drive shafts. Meets many mounting requirements SAE standard wet flange mountings and single or double shaft seals are available on all pumps. Mounting pads meet SAE standards and are available in several sizes and types to satisfy various mounting requirements and to facilitate interchangeability of Vickers and competitive units. Double shaft seals are ideal for applications where the pump pilot and shaft extend into a transmission case or crankcase. If either seal fails, the pump fluid remains separated from the transmission or crankcase fluid. Leakage past either seals drains to the exterior of the pump. The double seal feature thus reduces system downtime by preventing the mixing of different fluids and providing for visual detection of seal malfunction. The inlet of the thru-drive pump is open to the pump’s rear coupling area, requiring that mating pumps have a wet-flange mounting. If the rear mounting pad is capped instead of used to mount a pump, it must be sealed to prevent fluid leakage and entrance of air. Heavy duty construction The drive gear and drive shaft are one piece construction, as are the driven gear and shaft, to eliminate the potential problems of fretting and stress fatigue associated with two-piece construction. The one-piece design also allows the use of large diameter journals and bearings for greater loadcarrying capacity. Gears are of AISI 8620 alloy steel for greater shaft strength and a stronger gear assembly. Gears have ten teeth to minimize pressure ripple, and gear sides and shaft journals are carburized, hardened, and ground to a fine finish. The pumps large teflon impregnated bronze bearings are installed in precision bored covers for optimum shaft alignment. They provide a large support area that keeps bearing pressures low enough to handle most indirect drives. For applications imposing very high side loads, consult your Concentric representative. NOTE: This catalog features our most standard single, double and triple pump capabilities. Other pump options and multiple pump combinations are available. Please contact factory or your Concentric representative for information. See bottom of page 45 for contact information. DESCRIPTION, FEATURES AND BENEFITS Pictures on front cover are used with the kind permission of eg: Atlet, BT, Huddig, Scania, Toro and Volvo Construction Equipment. quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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