TRANSMISSION
L3301, L3901, L4701, WSM
3-S93
Checking and Adjusting HST Neutral Position
• Park the tractor on a flat place and keep all the levers at
"Neutral" position.
• Jack up the tractor rear axle and set the front drive lever to
"2WD" position.
1. Remove the hex. head plug from the HST housing case.
2. Install the adaptor C (PT3/8) (07916-50371) and the thread joint
(07916-50341) to the check port of the HST housing case.
3. Start the engine and measure the low and the high HST charge
pressure.
4. If any of the servo piston parts has been replaced, readjust the
HST neutral position, referring to the dimension "A" of the servo
piston adjusting screw (3).
5. Start the engine and measure the low and the high charge
pressures. Then adjust the piston neutral position so that the
low-side pressure and the high-side pressure one be the same.
Measure the charge pressure will setting the engine revolution
at MAX. Move the servo valve lever (5) and watch the rear tires'
movement to ensure the neutral positioning.
6. Finally lock the servo piston adjusting nut.
(Reference)
• Dimension "A": 10.55 mm (0.415 in.)
9Y1211012TRS0122US0
Charge pressure (Oil
temperature 50 to 60 °C
(122 to 140 °F))
Factory specification
2.3 to 2.6 MPa
23.5 to 27.0 kgf/cm
2
334 to 384 psi
(1) Hex. Head Plug (Reverse)
(2) Hex. Head Plug (Forward)
(3) Adjusting Screw
(4) Adjusting Screw Cap
(5) Servo Valve Lever
F: Forward
N: Neutral
R: Reverse
A: Adjusting screw height
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