CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Machine Systems Control Valve (Blade) Caterpillar


Control Valve (Blade)
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CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Machine Systems [KENR3607]
HYDRAULIC SYSTEM
VALVE GP-BLADE
CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Machine Systems Control Valve (Blade)
1.1. Control Valve for the Leveling Blade
2.2. Location and Function
3.2. Components of the Control Valve
4.2. Operation and Oil Flow
5.3. HOLD Position
6.3. RAISE Position
7.3. LOWER Position
8.3. FLOAT Position

Control Valve for the Leveling Blade

Location and Function




Illustration 1g00929155

Control valve (1) is located on the machine, as shown.

The blade control valve is a open center directional control valve. The control pedal for the blade directs the blade control valve in order to supply oil to the blade cylinder.

Components of the Control Valve




Illustration 2g00935025

Hydraulic Schematic

(1) Control valve (blade)

(2) Relief valve (blade)

(3) Relief valve (line)

(4) Control spool

The control valve (1) (blade) contains the following major components:

  • Relief valve (2) (blade)

  • Relief valve (3) (line)

  • Control spool (4)

Operation and Oil Flow

The operator sets the position of the control valve by moving the control pedal for the blade at the operator console.

The control valve operates in the following four positions:

  • HOLD

  • RAISE

  • LOWER

  • FLOAT

HOLD Position




Illustration 3g00935051

Hydraulic Schematic for HOLD Position

(1) Control valve (blade)

(2) Relief valve (blade)

(3) Relief valve

(4) Control spool

(5) Valve envelope

(6) Hydraulic cylinder

(7) Line from fan motor

(8) Line from steering pump

(9) Line to propel charge filter

(AA) Charge pressure

(AB) Activated components

(AC) Trapped oil

When the control pedal for the operator is in the HOLD position, valve envelope (5) will become active. This position allows oil to flow through control spool (4) . As a result, oil will go to propel charge filter (9) . The oil between control spool (4) and hydraulic cylinder (6) is trapped. When the control pedal for the operator is in the HOLD position and the blade encounters a solid object, the pressure will increase in the head end of cylinder (6) . Relief valve (3) will open allowing excess pressure to escape to the charge system.

RAISE Position




Illustration 4g01427941

Hydraulic Schematic for RAISE Position

(1) Control valve (blade)

(2) Relief valve (blade)

(3) Relief valve

(4) Control spool

(6) Hydraulic cylinder

(7) Line from fan motor

(8) Line from steering pump

(9) Line to propel charge filter

(10) Valve envelope

(AA) Charge pressure

(AB) Activated components

(AD) First pressure reduction

When the control pedal for the operator is in the RAISE position, valve envelope (10) will become active. This valve position will allow oil to flow through control spool (4) to the rod end of hydraulic cylinder (6) . As a result, the leveling blade will raise. When the blade reaches the full raised position, relief valve (2) will open. This will allow excess pressure to escape to the charge system.

LOWER Position




Illustration 5g01427863

Hydraulic Schematic for LOWER Position

(1) Control valve (blade)

(2) Relief valve

(3) Relief valve

(4) Control spool

(6) Hydraulic cylinder

(7) Line from fan motor

(8) Line from steering pump

(9) Line to propel charge filter

(11) Valve envelope

(AA) Charge pressure

(AB) Activated components

(AD) First pressure reduction

When the control pedal for the operator is in the LOWER position, valve envelope (10) will become active. This valve position will allow oil to flow through control spool (4) to the rod end of hydraulic cylinder (6) . As a result, the leveling blade will lower. When the blade reaches the full lower position, relief valve (2) will open. This will allow excess pressure to escape to the charge system.

FLOAT Position




Illustration 6g00937150

Hydraulic Schematic for FLOAT Position

(1) Control valve (blade)

(2) Relief valve

(3) Relief valve

(4) Control spool

(6) Hydraulic cylinder

(7) Line from fan motor

(8) Line from steering pump

(9) Line to propel charge filter

(12) Valve envelope

(AA) Charge pressure

(AB) Activated components

(AD) First pressure reduction

When the control pedal for the operator is in the FLOAT position, valve envelope (12) will become active. This valve position will allow charge oil to flow through control spool (4) and to the head end and rod end of hydraulic cylinder (6) . Equal pressure in the rod end and in the head end of hydraulic cylinder (6) will cause the blade to float. Any oil that is displaced from cylinder (6) will flow through control spool (4) . The oil will then go to the charge system. As a result, the blade will follow the contour of the ground.

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