88
HST pedal stopper adjustment
1. HST pedal stopper length adjust to 25 mm for
forward pedal, an 30 mm for reverse pedal.
(7) Pressure Check
High pressure relief check
1. Jack up the front and rear wheels off of the ground
and place jack stands under the axles. Make sure all
four wheels are clear of the ground and the
commercial mower is properly supported.
2. Disconnect the wire from the seat neutral switch
and connect a jumper wire between the two harness
leads.
3. Remove the fender as follows the step 1. ROPS to 5.
Fender or the “2. Removal and installation of front
axle and transmission, and HST unit” in Chapter
3-1.
4. Remove the plug from port “A”, and install a 0–30
MPa {0–300 kgf/cm
2
} gauge and house.
NOTE: Port “A” (L.H. when seated) will check the
high pressure relief valve for forward
travel and port “B” for reverse.
5. Start the engine and depress the forward pedal a
third of the way down.
6. Increase the engine speed to full throttle.
7. Apply the master brake pedal and read the pressure
on the gauge.
NOTE: Measure the pressure reading in 2–3
seconds. The pressure must be 17.7 MPa
{180 kgf/cm
2
}. If the pressure is not within
specifications replace the relief valve
assembly.
442V
443V
444V
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