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| Illustration 1 | g00795719 |
(1) Control valve (saw motor). (2) Solenoid valve. (A) Work port passage. (P) Pump passage (saw). (PS) Pilot pressure passage. (SPD) Pilot drain passage. (T) Tank passage. | |
The control valve (saw motor) is located next to the main control valve in the engine compartment.
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| Illustration 2 | g00795521 |
Cross Section of Control Valve (Saw Motor) (3) Valve spool. (4) Spring. (A) Work port passage. (B) Work port passage. (P) Pump passage (saw). (PS) Pilot pressure passage. (SPD) Pilot drain passage. (T) Tank passage. | |
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| Illustration 3 | g00795733 |
Hydraulic Schematic of Control Valve (Saw Motor) (1) Control valve (saw motor). (2) Solenoid valve. (3) Valve spool. (4) Spring. (5) Pressure relief valve. (A) Work port passage. (B) Work port passage. (P) Pump passage (saw). (PS) Pilot pressure passage. (SPD) Pilot drain passage. (T) Tank passage. | |
The pressure oil from the saw pump flows into the control valve (1) through pump port (P). The flow of pump oil is controlled by control valve (1). The oil flow is supplied to the saw motor.
Pressure relief valve (5) limits the oil pressure from the saw pump to 36260 ± 490 kPa (5250 ± 70 psi). When oil pressure exceeds the pressure setting of pressure relief valve (5), the oil flows from tank port (T) back to the hydraulic tank through the return line.
Main spool (3) is shifted with pilot oil pressure. Pilot oil pressure is controlled by the solenoid valve (2) .
When the saw button is moved to ON position, an electrical signal activates solenoid valve (2). This allows the pilot oil from pilot pressure passage (PS) to flow to valve spool (3). Now, valve spool (3) shifts against the force of spring (4). Then, pressure oil from pump passage (P) flows through valve spool (3) to work port (A). The pressure oil flows from work port (A) to the saw motor.
When the saw button is moved to OFF position, solenoid valve (2) is deactivated. This stops the flow of pilot oil to valve spool (3). Now, spring (4) shifts valve spool (3). Then, pressure oil from pump passage (P) flows through valve spool (3) to tank port (T). The pressure oil flows from tank port (T) to the hydraulic oil tank. Also, the pilot oil flows through solenoid valve (2) to the hydraulic oil tank.