The Stanley 74864 is a complete replacement service pump assembly for Stanley TJ12 10-ton hydraulic track jacks. The assembly incorporates the pump body, handle, piston, spindle, hydraulic reservoir and bladder, check and relief valve components, seals, and related installation hardware.Its long-travel pump action reduces the number of strokes required to raise the jack, while the internal reservoir bladder supports operation in any position. This listing is for the service pump assembly only; the TJ12 track jack is not included.Specs Brand: Stanley MPN: 74864 Product Type: Hydraulic Service Pump Assembly Equipment Type: Railroad Track Jack Compatible Series: Stanley TJ12 Compatible Models: TJ12111S Standard-Base and TJ12112S Narrow-Base Track Jacks Track Jack Capacity: 10 tons System Operating Pressure: 7,250 PSI (499 bar) Jack Travel per Pump Stroke: 0.16 in (0.4 cm) Pump Configuration: Integral Pump and Carry Handle Reservoir Type: Internal Bladder Relief Valve: Factory Preset Assembly Includes: Pump Body, Handle, Reservoir, Bladder, Piston, Spindle, Check and Relief Valve Components, Seals, and Related Hardware Track Jack Included: No Selling Unit: Each