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| Illustration 1 | g03417872 |
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(1) Pilot pump
(2) Blade pump (3) Delivery line (4) Return line (5) Blade cylinder (6) Blade (7) Swivel (8) Distribution block (9) Pilot control valve (10) Blade control lever (11) Blade control valve | |
Hydraulic Schematic For Blade Neutral Position
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| Illustration 2 | g03417867 |
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Blade schematic (Blade Neutral) (1) Pilot pump (2) Blade pump (3) Delivery line (4) Return line (5) Blade cylinder (7) Swivel (8) Distribution block (9) Pilot control valve (11) Blade control valve (12) Main relief valve (blade) (13) Line relief valve (blade) (14) Blade control pressure switch | |
Blade (6) is attached to the front of the undercarriage. The primary usage of the blade is for leveling work and increasing machine stability.
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| Illustration 3 | g03417866 |
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(3) Delivery line
(4) Return line (7) Swivel (11) Blade control valve (14) Blade control pressure switch | |
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| Illustration 4 | g03417874 |
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(9) Pilot control valve
(10) Blade control lever | |
Blade cylinder (5) is driven by the oil delivery from blade pump (2). The supply oil flows through delivery line (3) to blade control valve (11).
Blade control lever (10) controls the movement of blade (6).
The control lever controls the following four positions of the blade:
- RAISE
- LOWER
- NEUTRAL
- FLOAT
Leveling work is accomplished by using the mass (weight and size) of the blade in the FLOAT position
Blade cylinder (5) extends or blade cylinder retracts by moving the blade control lever.
When blade control lever (10) is placed in the NEUTRAL position, oil to blade cylinder (5) is blocked. In this position, the blade (6) can be used as a stabilizer. The circuit pressure for the blade is limited by main relief valve (12).
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| Illustration 5 | g03417869 |
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Blade control valve (12) Main relief valve (blade) (13) Line relief valve (blade) (15) Return port (16) Pressure gauge port (17) Pilot port (18) Port (19) Supply port (20) Port (21) Pilot port | |
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| Illustration 6 | g03417871 |
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Blade schematic (Blade Raise) (1) Pilot pump (2) Blade pump (3) Delivery line (4) Return line (5) Blade cylinder (7) Swivel (8) Distribution block (9) Pilot control valve (11) Blade control valve (12) Main relief valve (blade) (13) Line relief valve (blade) (14) Blade control pressure switch | |
Pilot pump (1) sends oil into the pilot manifold. When the hydraulic unlock switch in put in the UNLOCKED position, pilot oil is sent to distribution block (8). Pilot oil then flows into pilot control valve (9).
When the blade control lever is moved backward to the RAISE position, pilot oil flows through pilot control valve (9), and enters pilot port (21) inside of blade control valve (11). Blade control valve (11) shifts toward the front of the machine. Oil delivery from blade pump (2) flows though delivery line (3). The oil then flows into blade control valve (11).
When blade control valve (11) shifts towards the front of the machine, the oil from blade pump (2) flows through supply line (1). The oil then flows into blade control valve (11), and through swivel (7). The oil flows from swivel (7) to the rod end of blade cylinder (5).
Return oil from the head end of blade cylinder (5) flows through swivel (7), through return port (15) , and through return line (4) to the hydraulic tank.
This action causes the blade to raise.
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| Illustration 7 | g03417870 |
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Blade schematic (Blade Lower) (1) Pilot pump (2) Blade pump (3) Delivery line (4) Return line (5) Blade cylinder (7) Swivel (8) Distribution block (9) Pilot control valve (11) Blade control valve (12) Main relief valve (blade) (13) Line relief valve (blade) (14) Blade control pressure switch | |
Pilot pump (1) sends oil into the pilot manifold. When the hydraulic unlock switch in put in the UNLOCKED position, pilot oil is sent to distribution block (8). Pilot oil then flows into pilot control valve (9).
When the blade control lever is moved forward to the LOWER position, pilot oil flows through pilot control valve (9), and enters pilot port (17) inside of blade control valve (11). Blade control valve (11) shifts toward the front of the machine. Oil delivery from blade pump (2) flows though delivery line (3). The oil then flows into blade control valve (11).
When blade control valve (11) shifts towards the rear of the machine, the oil from blade pump (2) flows through supply line (1). The oil then flows into blade control valve (11), and through swivel (7). The oil flows from swivel (7) to the head end of blade cylinder (5).
Return oil from the rod end of blade cylinder (5) flows through swivel (7), through return port (15) , and through return line (4) to the hydraulic tank.
This action causes the blade to lower.
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| Illustration 8 | g03417873 |
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Blade schematic (Blade Float) (1) Pilot pump (2) Blade pump (3) Delivery line (4) Return line (5) Blade cylinder (7) Swivel (8) Distribution block (9) Pilot control valve (11) Blade control valve (12) Main relief valve (blade) (13) Line relief valve (blade) (14) Blade control pressure switch | |
When blade control lever (10) is moved forward into the detent position, the blade is placed in the FLOAT position. Oil flow from blade pump (2) is blocked at blade control valve (11). Hydraulic oil in the rod and head ends of blade cylinder (5) are opened to the hydraulic tank.
In the FLOAT position, no pump oil is supplied to the blade cylinder. No hydraulic control is used on the blade cylinder. The mass (size and weight) of the blade causes the blade to stay on the ground. The FLOAT position is suitable for leveling work on a soft surface.