Komatsu Galeo PC800-8 Shop Manual page 274

Hydraulic excavator

Table of Contents

9. Straight-travel function

When the travel is operated at the same time as

the boom, arm, or bucket, the pressure oil flow-

ing to the left and right travel circuits is divided

and sent to the boom, arm, or bucket circuit.

If the oil in one travel circuit is divided off, the

amount of oil supplied to the travel motor will be

less than in the travel circuit which is not divided,

so the drop in the supply of oil to the travel

motor will cause the machine to deviate.

10 Structure, function and maintenance standard

To prevent this, the straight-travel valve is

switched to interconnect the left and right travel

circuits. This ensures that the amount of oil sup-

plied to the left and right travel motors is equal,

so the left and right travel motors both rotate at

the same speed, and this prevents any travel de-

PC800, 850-8

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