B22W-202010
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CHAPTER 4 HST SYSTEM1022H TRACTOR
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6.4.6 STARTING
6.4.7 OIL TEMPERATURE MANAGEMENT
CAUTION
• As for hydraulic unit, the most important thing
is to how extent a driving temperature is main-
tained. If it is too high, oxidative resistance
of hydraulic oil (operating oil) deteriorates,
which leads to the shortening of its service
life. On the contrary, if it is too low, its density
gets high, which leads to the deterioration of
comply to the following precautions.
1. Starting Temperature
In case that a driving temperature is less
and start to drive the Main Body.
2. Common Driving Temperature
3. Max. Limit of High Temperature for Driving
max. limit value is determined by the aging
effects of hydraulic oil’s density, oxidative re-
sistance, O-ring, and Oil Seal, etc. So, driving
of HST, not to mention the life of oil.
WARNING
1. Fill a hydraulic oil (operating oil) in HST Case.
2. After mounting HST, start to idle the engine,
work the pedal of vehicle slowly, and move
it forward/backward repeatedly. In this way,
air has to be let out of HST.
Failure to let the air out of HST fully results
to noise caused by aeration, not by HST. So,
you shall continue the above operation pro-
cedure until the noise is completely gone.
If there is an excessive inflow or mix of air,
Output Shaft of HST may not work its rotation.
In this case, place the Lever at its maximum
inclination angle from idling rotation of en-
gine temporarily, and it starts to rotate. (In this
case, it is safe to jack up a vehicle because a
sudden acceleration of vehicle can occur)
3. At first, you shall drive it at a low rotation
state. After checking that there is nothing
abnormal, such as noise or vibration, you
6.4.8 PIPING
WARNING
1. As for drain pipe of HST, you shall set the
size, length and bending of pipe so that in-
ternal pressure of HST Case can be less
2. Be sure to wash the pipe before assembly,
and eliminate scales in the pipe safely.
3. A special care is needed not to have dirty or
foreign materials comes into the pipe from
inlets of each HST while laying pipe.
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