Volvo EC460B - Straight Travel Operation

Straight travel
1. All spools are in neutral condition.
- 40 bar enters in port-P and Pa which has orifice.
- oil from one orifice connected to Py port and then pass through two travel spool and go to the return
line.
- oil from the other orifice pass through the straight travel spool and two travel spool and go to the return
line.
- Oil from the other orifice pass through every other attachment.
- P1 is goint to supply TR side and Swing side through the straight travel valve.
- P2 is going to supply TL side and Boom1 side.
2. Travel (RH)
- Spool movement block the line from orifice and bulid up pressure.
- Travel pilot pressure switch ON
- P2 oil goes to TL side directly and Boom1 side parallel passage.
3. Travel (LH)
- Spool movement block the line from orifice and bulid up pressure.
- P1 oil goes to TL side directly and Boom1 side parallel passage
4. Swing operation
- Swing spool movement block the line from the other orifice and build up pressure.
- Attachment pilot pressure switch ON
- Block the back side of check valve
- Straight travel spool spring side will be pressurized.
5. Straight travel spool move to LH side.
- Inside check valve will be closed.
From this point
- P1 oil goes to TR side directly and TL side through the straight travel spool.
- P2 oil goes to Boom1 side and swing side.
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