5 - 10
3-Speed Travel and Max. Flow (Q) Cut
1. Travelling at middle speed (always middle speed as
the key is switched ON).
Even though travel and upper pressure switches are ON,
there is no output to solenoid valves A and B.
Travel motor swash plate is in low speed position.
Pump: Standard flow.
2. Travelling at high speed (pressing IN5 switch once
when travelling at middle speed, shifts to high speed.)
The travel motor switching solenoid valve turns ON and
swash plate of the motor shifts to high speed position.
3. Travelling at low speed (pressing IN5 switch once
when travelling at high speed, shifts to low speed.)
When a travel pressure switch is switched, the max. flow
cut solenoid valve turns ON and flow (Q) is cut. Swash
plate of the motor shifts to low speed position.
Pump flow is cut.
When upper pressure switch is turned on, max. flow rate
cut solenoid valve is de-energised to prevent excavator
circuits being slowed
Section C
Electrics
9803/6400
Section C
5 - 10
Issue 1
Pump Control
1. At middle speed travel
Travel motor swash plate: low side
Pump: Standard
2. At high speed travel
Travel motor swash plate: Upper side
3. At low speed travel
Pump: Q cut
Same as in S mode.
AA
BB
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