TM 5-3895-346-14
INSTALLATION AND PLUNBING
HYDROSTATIC SYSTEM
will become slow and sluggish. This will occur before any damage to the transmission results and provide
ample indication that a filter element change is required.
All filter cartridges should be sufficiently strong to prevent collapse or rupture under the most adverse operating
conditions.
HEAT EXCHANGER (FIG. 1, ITEM 10)
Provisions should be made in the system to ensure that the maximum continuous operation temperature shall
not exceed 180 at the motor case drain. This may require the use of a heat exchanger in the reservoir return
F
circuit, dependent upon the specific duty cycle and design of the machine. Generally, the optimum heat
exchanger size should be capable- of dissipating 20-25% of the maximum transmission input horsepower.
The fluid restriction resulting from the case drain lines and heat exchanger should not exceed 40 psi case
pressure at normal system temperature. This may require the use of a pressure bypass around the heat
exchanger (Fig. 1, Item 3).
HYDRAULIC FLUID
The hydraulic fluid used in the system should be selected using the guidelines given in the fluid
recommendations in Transmission Startup.
HYDRAULIC LINES (FIG. 1, ITEMS 6, 7, 8, 9 AND 11)
The hydraulic lines selected should be compatible with good hydraulic practices regarding length, diameter,
pressure capabilities, bend radii, fluid compatibility, and transmission operating limits.
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