The newer Western plows used the Electric Solenoid Power Packs. These reliable units have quick response and use electric solenoid valves. Rarely do they break down but when they are not responding as quickly as they should be you may need a new cartridge or new seals. Beside the motor and plunger ram, Mill Supply also lists replacement parts like the pump assembly, o-rings, quill assembly, packing nuts and cushion valve repair kit. If you just need to do a major overhaul we also carry a Master Seal Kit just for the job.