8 - HYDROSTATIC TRANSMISSION
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7. Stop the engine.
8. If the pressure reading is not at the specified value,
replace the forward high pressure relief valve, 1.
9. Tighten the relief valve cap plug, 2, to 40.7 – 95
N･m (4.2 – 9.7 kgf･m).
NOTE: The forward and reverse, high pressure relief
valves are not interchangeable.
10. Remove the gauge and install the port “A” plug, 3.
11. Tighten the plug to 40.7 – 95 N･m (4.2 – 9.7 kgf･
m).
Reverse Testing
1. Remove the plug from port “B” (reverse) and
install a 0 – 34 MPa (0 – 350 kgf/c ㎡) gauge in the
port.
NOTE: Port “B” is used to check the high pressure
relief valve for reverse travel of the HST.
2. Start the engine and place the range control lever in
the “High” range position.
3. Apply and hold the master brake pedal.
4. Depress the “Reverse” pedal 1/3 of the way down.
5. Increase the engine speed to full throttle.
6. Observe the pressure gauge. When 2 – 3 seconds,
the pressure reading should be approximately 17.2
MPa (175 kgf/c ㎡).
7. Stop the engine.
8. If the pressure reading is not at the specified value,
replace the reverse high pressure relief valve, 1.
9. Tighten the relief valve cap plug, 2, to 40.7 – 95
N･m (4.2 – 9.7 kgf･m).
NOTE: The forward and reverse, high pressure relief
valves are not interchangeable.
10. Remove the gauge and install the port “B” plug, 3.
11. Tighten the plug to 40.7 – 95 N･m (4.2 – 9.7 kgf･
m).
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