Hydraulic fluids used with Sundstrand-Sauer Hydrostatic Transmission products should be selected with assistance from a reputable supplier,
(Hydrostatic Transmission),following the guidelines presented in the "Fluid Quality Requirements" bulletin, BLN-9887.
It is important to follow the procedures for a new Series 40 – Sundstrand Sauer Hydrostatic Transmission for installing or restarting an installation on a pump or motor that has been detached from a Sundstrand system.
Quick Tip- the vehicle/machine is to be disabled uplift the wheels off the ground and turn the machine off. Then it is safe to proceed to performing the process in order to prevent injury to the mechanic or anyone standing by. Therefore, take the crucial safety precautions before moving the vehicle/machine.
Before installing the pump and/or motor, examine the units for damage incurred during shipping and handling. Make sure all the system components are clean preceding filling it with fluid. (reservoir, hoses, valves, fittings, heat exchanger).
Fill the reservoir with suggested hydraulic fluid, which should be passed through a 10-micron (no bypass) filter prior to the ingoing fluid to the reservoir. Fluids that are containing foreign particle will cause damage to the components, and may be the reason in unexpected vehicle/machine movement.
The inlet line that leads from the reservoir to the pump should be filled before start up and make sure the inlet lines have tight fittings, free of restrictions and air leaks.
Very important: to fill the pump and/or motor housing with clean hydraulic fluid before the start up. Fill the housing up with filtered oil in the upper case drain port.
It is suggested to Install a 0 to 500 PSI (35 BAR) pressure gauge to observe the charge pressure during start-up.
It is suggested by Hydrostatic Transmssion,LLC that the outer control input signal (connection for MDC, hydraulic lines for HOC and electrical connections for EDC) be detached at the pump control until initial start-up is satisfactory. This allows the pump to remain in neutral position.
"Nudge" or slowly turn prime mover pending charge pressure starts to rise. Running the prime mover at the lowest possible RPM until desired charge pressure has been reached. Bleed air from lines through the high pressure gauge ports.