Komatsu 830E Shop Manual page 443

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FIGURE 4-12. PUMP IN NEUTRAL POSITION

1. Control Piston

4. Swashblock

FIGURE 4-13. STEERING PUMP HYDRAULIC SCHEMATIC

Steering Circuit

Neutral Position:

Neutral position (Figure 4-12) results when the con-

trol piston (1) centers the swashblock (4). The

swashblock angle is now zero and swashblock face

is now parallel to cylinder face. Therefore, no inward

or outward motion of the pump pistons exists as pis-

ton shoes rotate around the swashblock face. The

lack of inward and outward motion results in no fluid

being displaced from the piston bores to the cres-

cents in the valve plate and subsequently no deliv-

ery from pump ports.

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