8 - HYDROSTATIC TRANSMISSION
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2) Low (Charge) Pressure Relief Valve
1. Remove either plug “A” or “B” from the port
block.
2. Install a 0 – 3.5 MPa (0 – 35 kgf/c ㎡) pressure
gauge in the open “A” or “B” port.
3. Remove the cotter pin, 1, washer, 2, and disconnect
the HST control rod, 3, from the HST unit.
4. Place the range gear control lever in the “Neutral”
position.
5. Increase the engine speed to 1500 rpm and read the
pressure on the gauge. The low pressure relief
setting is 0.3 – 0.5 MPa (3 – 5 kgf/c ㎡). If the
pressure is different from the standard value,
replace the valve and spring.
6. To change the relief valve and spring, stop the
engine and remove the plug.
7. Install a new valve and spring and replace the plug.
8. Tighten the plug to 20 – 34 N･m (2 – 3.4 kgf･m).
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