Shaft Seal

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 bore or shaft doesn’t become damaged. The seal is not reusable after it’s removal.

Before installing the new seal, look the sealing areas over on the shaft for rust, wear, or contamination. Also if it calls for it polish the sealing area.

The key end of shaft needs to be wrapped with lightweight plastic to avoid damage to the seal lip during installation. Grease the inside thickness of the new seal with petroleum jelly.

Slide the new seal over the shaft and press it into the housing bore. Be careful not to damage seal. A seal installer tool can be made to aid in installing the seal. Dimensions for this tool are shown in the accompanying drawing.

Reinstall the seal-retaining ring.

High flow check valves in pumps –maintain the system at it’s highest performance with very little drop in pressure.

Charge pumps on pumps – gerotor type, numerous displacement options are accessible to curtail the needs of every purpose. Pumps are made of cast iron.
Cartridge shaft seal-allows itself to easy serviceability. Motorized face seal design makes the pumps more efficient for high speed and case pressure

 
Advanced cylinder barrel design –helps with high pressure and speed.

Fixed clearance slipper hold down –
 Models 33 through 64 allow functions at high speed and decrease resistance. Model 76 is a ball guide unit.

Pistons – have more contact with cylinder bore ensuring low leakage.
Hydraulic servo control – offers effortless operation, along with very low control pressure.The hefty servo pistons grasp the swash plate position and offer damping.

Large case drain ports – lessen case back pressure.

High flow check valves in pumps –maintain the system at it’s highest performance with very little drop in pressure.

Charge pumps on pumps – gerotor type, numerous displacement options are accessible to curtail the needs of every purpose. Pumps are made of cast iron.
Cartridge shaft seal-allows itself to easy serviceability. Motorized face seal design makes the pumps more efficient for high speed and case pressure

 
Advanced cylinder barrel design –helps with high pressure and speed.

Fixed clearance slipper hold down –
 Models 33 through 64 allow functions at high speed and decrease resistance. Model 76 is a ball guide unit.

Pistons – have more contact with cylinder bore ensuring low leakage.
Hydraulic servo control – offers effortless operation, along with very low control pressure.The hefty servo pistons grasp the swash plate position and offer damping.

Large case drain ports – lessen case back pressure.