Hydraulic Pumps & Motors INTRODUCTION This Hydraulic Pump and Motor Reference Guide is designed to assist dealers with their repair options programs. Preparing repair options by classification rather than by group reduces the number of repair options which need to be priced. Pumps and motors tend to be designed and manufactured in discreet sizes. Therefore, classifications for pumps and motors can be assigned with reasonable assurance that the consists within each classification will have few and minor variations. For example, a range of flows (displacements) for an entire series of vane type pumps can be achieved by simply changing the profile ground into the cam ring. No other parts within the vane pump cartridge change. A similar situation exists for gear and piston type pumps and motors. Gear pumps and motors within a classification have the same pitch diameter and tooth profile. The displacement is increased or decreased by lengthening or shortening the gear tooth. Piston pumps and motors usually have the same rotating groups within a classification. Variations are achieved by adjustments to swashplate angles and controls. This guide does not include power train pumps and motors, or track motors and rotating groups in the HPCU of the Cat Hydrostatic Track Type Loaders. This guide will be improved and updated continually. Your comments and suggestions will be important in this process and are strongly encouraged. SECTION 1 (Model Listing) Lists the pumps and motors, sorted by Cat machine family and Cat machine model. This list is cross-referenced to the part number and classification. This section makes it easier for the parts and service sales representative to talk knowledgeable to customers and present repair cost estimates. SECTION 2 (Class) Groups pumps and motors by classification, identifying the Cat machine model, serial number, system and part number. This section helps the person responsible for repair options to prioritize the development of classifications and to select the pump part numbers used to develop the repair option estimates. SECTION 3 (Part Number to Class) An alpha-numerical listing of all pump and motor part numbers in the guide, cross referenced to their classification. With this section, a repair estimate can be made when only the part number is known. SECTION 4 (Group Number to Reman Part/Group Number) This section allows identification of remanufactured pump/motor part and group availability through pump/motor group numbers.
