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The older style pump had two port plates, they were on the sides of the gerotor. The displacement for the charge pump happen to be lower than the highest that you could get on the pump’s frame size, your inside plate is gonna be thicker and this is the size for (.05 inches) the outer plate. On the new model, the port plates will be the same at .05 inches on both sides. If your charge pump displacement is less than what you can get, you will have to put two spacers between the charge pump and cover. The keyway...

These affect M25, M35 and M44 pumps.The seals are now assembled before hand into the trunnion cover. The cover and the seal assemble are part of a service part. But the trunnion cover by itself is not a part of the service parts.The parts that are affected by this change are:trunnion cover assembly, lip seal and trunnion cover and they are interchangeable. These affect M25, M35 and M44 pumps and variable motors.The change made to the trunnion seal is that the dust lip has been made longer. It gives more room for letting concentric tolerance and lead way to put...

Hydrostatic Transmission Service,LLC offers lip type shaft seal on Series 40 pumps and motors The seals on these pumps and motors can be replaced with no major disassembly to the unit, although, replacement of the shaft seal calls for removal of the pump or motor from the machine. Then take out the retaining ring from the housing.With great ease take out the seal from the housing bore. A slide hammer type puller should be used to aid in prying the seal out, otherwise the seal may become punctured if using a sharp instrument. Restraint should be taken so the housing...

The older style pump had two port plates, they were on the sides of the gerotor. The displacement for the charge pump happen to be lower than the highest that you could get on the pump’s frame size, your inside plate is gonna be thicker and this is the size for (.05 inches) the outer plate. On the new model, the port plates will be the same at .05 inches on both sides. If your charge pump displacement is less than what you can get, you will have to put two spacers between the charge pump and cover. The keyway...

These affect M25, M35 and M44 pumps.The seals are now assembled before hand into the trunnion cover. The cover and the seal assemble are part of a service part. But the trunnion cover by itself is not a part of the service parts.The parts that are affected by this change are:trunnion cover assembly, lip seal and trunnion cover and they are interchangeable. These affect M25, M35 and M44 pumps and variable motors.The change made to the trunnion seal is that the dust lip has been made longer. It gives more room for letting concentric tolerance and lead way to put...