CHAPTER 10. HYDROSTATIC TRANSMISSION
113
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4.9. LIST OF MAJOR COMPONENTS OF HIST
Fig. 10-44
4.10. PRECAUTIONS FOR INSTALLATION OF
HST UNIT
(1) INSTALLATION OF SHAFTS
a. The input shaft (output shaft) and the driving
shaft (driven shaft) of the two shaft type HST
should be aligned correctly. The deviation of
centering should be less than 0.05 mm.
b. When mounting or dismounting the two shaft
type HST onto or from the machine, prevent the
input and output shaft end from excessive thrust
load.
(2) INSTALLATION OF TRUNNION SHAFT
Provide a stopper in place before the maximum
inclination of the trunnion shaft when there is a
fear of application of stronger force to the trun-
nion shaft than HST operating force.
4.11. PRECAUTIONS AFTER INSTALLATION
OF HST UNIT
(1) STARTING
a. Fill the HST case with working fluid.
b. After the installation of the HST system, oper-
ate the control lever or pedal slowly several
times in order to bleed the system of air com-
pletely.
• When air-bleeding is incomplete, trapped air
bubbles make noise. Repeat the above air-bleed-
ing operation until such noise is elimiated.
• When excessive air is trapped inside the system,
the output shaft may not turn. But when the con-
trol lever is held at the maximum angle under
idling speed for a while, the shaft will begin
turning. This may cause the machine to start
abruptly, so a safety measure should be provided
such as jacking up the drive wheels.
c. At first make sure there are no abnormal noises
or vibrations generated at low speed and then
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