PERMCO Hydralic Bushing Pumps / Motors 124 Series.

The P197/P257 series is a series of high performance gear pumps. This completely new design utilizing computer aided engineering has allowed Permco to develop a state of the art external gear pump for heavy duty, high performance mobile applications.

Utilizing specialized sleeve bearing technology, gear journals are supported via a hydro-dynamic film, thus allowing continuous working pressures up to 4500 psi (310 bar) dependent upon the series and the selected gear size. At rated speeds up to 2400 rpm, the series is compatible with all mineral based hydraulic oils and some fire resistant fluids (water glycol and invert emulsions). Employing high strength iron for all pump body components and an all doweled construction, the P197/P257 is well suited for high pressure and high shock load applications.

Internal to the P197/P257 are its patented pressure balanced bronze thrust plates. Being of the floating type, the thrust plates are allowed to move freely, providing a positive seal across the entire face of its mating gear set and ensuring optimum volumetric performance at the highest operating pressures.

The P197/P257 gears are made from a high quality nickel alloy steel that ensures minimal gear flexure at high operating pressures. By using such a steel, the P197/P257 can be operated over a broad range of working pressures without the ensuing gear wipe of the housing at high pressures that can seriously detract from the volumetric output at lower working pressures.

The series is available in both single and multiple gear housing configurations with a variety of drive shaft and porting options. Depending upon the application, the use of Permco's P3000 series continental drive shafts may be applied to the P197 series.