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PN-51210 (Rev. 7/98)
Handle pressurized hydraulic fluid carefully. Escaping pressurized hydraulic
fluid has sufficient force to penetrate skin causing serious injury. This fluid
may also be hot enough to burn. Serious infection or reactions can develop
if proper medical treatment is not administered immediately.
Premium hydraulic fluids containing high quality rust, oxidation, and foam
inhibitors are required. These include premium turbine oils, API CD engine
oils per SAE J183, M2C33F or G automatic transmission fluids meeting
Allison C-3 or Caterpillar TO-2, and certain specialty agricultural tractor
fluids.
Follow this start-up procedure to start a new installation or to restart an
installation if the hydrostatic pump was removed from the system.
1. Make sure all system components (reservoir, fittings, etc.) are clean
before starting the hydrostatic pump.
2. Fill the reservoir with recommended hydraulic fluid (filter before filling).
3. Fill the inlet line leading from the reservoir to the charge pump before
start-up. Loosen the fitting on this inlet line until oil bleeds out.
Warning! Do not start engine unless pump is in neutral or detent position on the
cable.
4. Start the engine and run at the lowest possible RPM.
5. Refill the reservoir as necessary. The oil level in the reservoir drops and
bubbles appear in the fluid as air purges from the unit.
6. Run the unit in both directions for several minutes until any remaining
air is purged from the unit. Refill the reservoir as necessary.
7. Loosen a motor fitting and oil-bled to remove air from the system (use
same procedures as steps 3-5) if needed.
8. Disengage PTO, check for and correct any fluid leaks, and check the
reservoir level. Add fluid if necessary.
• The hydrostatic pump is now ready for operation.
H
YDRAULIC
F
EED
O
PERATION
I
NSTRUCTIONS
Hydrostatic pressure
controlled by the
crossover relief valve is
factory set at 1750 PSI.
A 2000 PSI shim kit is
available for extreme
conditions.
Bypass Valve
Control Shaft Seal
Charge Check Valve
Charge Pump
Input Shaft Seal
Figure 10
Pump-Component
Locations
Hydraulic Feed Operating Instructions
Fluids
Hydrostatic Pump Start Up Procedure