LINES GP- 5172401 - Caterpillar

General Instructions
These service instructions will familiarize you with Commercial's single and multiple pumps and motors - their components parts - the relative position of each part - proper methods for assembly or disassembly of the units - care and use of these oil hydraulic power units - so that best performance and longer working life will result for your benefit.To facilitate the repair of these units - and before any work is done - we suggest that you first read all of the steps used in disassembly and all of the steps used in building up the unit.Dirt is the enemy of any hydraulic system. The first requirement of good maintenance of hydraulic equipment is cleanliness. Make sure you disassemble and assemble your hydraulic equipment in a clean area.Our pictures show a Model 51. Notes in the text cover variations between this unit and the other models.It is important to airblast all parts and wipe them with a clean, lintless cloth before assembly.Use caution in gripping all parts in the vise to avoid damaging machined surfaces.A pump must be driven in the direction of rotation for which it was built; otherwise, pressure will blow the shaft seal. Check the exploded view below for proper direction of rotation.