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| Illustration 1 | g03417864 |
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(1) Delivery line
(2) Blade pump (3) Pilot pump (4) Return line (5) Blade control valve (6) Blade control lever (7) Pilot control valve (8) Pilot oil distribution block (9) Swivel (10) Blade (11) Blade cylinder | |
Hydraulic Schematic For Blade Neutral Position
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| Illustration 2 | g03417858 |
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Blade hydraulic schematic (Blade Neutral) (1) Delivery line (2) Blade pump (3) Pilot pump (4) Return line (5) Blade control valve (7) Pilot control valve (8) Pilot oil distribution block (9) Swivel (11) Blade cylinder (12) Line (13) Line relief valves (blade) (14) Main relief valve (blade) (15) Unloading valve (16) Blade control pressure switch (17) Pilot manifold | |
Blade (10) 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 | g03417861 |
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(1) Delivery line
(4) Return line (5) Blade control valve (9) Swivel (16) Blade control pressure switch | |
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| Illustration 4 | g03417863 |
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(6) Blade control lever
(11) Pilot control valve | |
Blade cylinder (11) is driven by the oil delivery from blade pump (2). The supply oil flows through delivery line (1) to blade control valve (5). Blade control lever (6) controls the movement of blade (10).
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 (11) extends or blade cylinder (11) retracts by moving the blade control lever.
When blade control lever (6) is placed in the NEUTRAL position, oil to blade cylinder (11) is blocked. In this position, blade (10) can be used as a stabilizer. The circuit pressure for the blade is limited by main relief valve (14).
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| Illustration 5 | g03417857 |
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Blade control valve (13) Line relief valves (blade) (14) Main relief valve (blade) (17) Pilot port (18) Return port (19) Supply port (20) Pilot port (21) Port (Head end of blade cylinder) (22) Port (Rod end of blade cylinder) | |
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| Illustration 6 | g03417860 |
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Blade hydraulic schematic (Blade Raise) (1) Delivery line (2) Blade pump (3) Pilot pump (4) Return line (5) Blade control valve (7) Pilot control valve (8) Pilot oil distribution block (9) Swivel (11) Blade cylinder (12) Line (13) Line relief valves (blade) (14) Main relief valve (blade) (15) Unloading valve (16) Blade control pressure switch (17) Pilot manifold | |
When the blade control lever is moved backward to the RAISE position, pilot oil flows from pilot pump (3), through pilot control valve (7), and enters pilot port (17) in blade control valve (5). Blade control valve (5) shifts toward the front of the machine in order to raise the blade.
When blade control valve (5) 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 (5), and through swivel (9). The oil flows from swivel (9) to the rod end of blade cylinder (11).
Return oil from the head end of blade cylinder (11) flows through swivel (9), through return port (18) , and through return line (4) to the hydraulic tank.
This action causes the blade to raise.
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| Illustration 7 | g03417856 |
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Blade hydraulic schematic (Blade Lower) (1) Delivery line (2) Blade pump (3) Pilot pump (4) Return line (5) Blade control valve (7) Pilot control valve (8) Pilot oil distribution block (9) Swivel (11) Blade cylinder (12) Line (13) Line relief valves (blade) (14) Main relief valve (blade) (15) Unloading valve (16) Blade control pressure switch (17) Pilot manifold | |
When the blade control lever is moved forward to the LOWER position, pilot oil flows from pilot pump (3), through pilot control valve, and enters pilot port (20) in blade control valve (5). Blade control valve (5) shifts toward the rear of the machine in order to lower the blade.
When blade control valve (5) 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 (5), and through swivel (9). The oil flows from swivel (9) to the head end of blade cylinder (11).
Return oil from the rod end of blade cylinder (11) flows through swivel (9), through return port (18) , and through return line (4) to the hydraulic tank.
This action causes the blade to lower.
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| Illustration 8 | g03417865 |
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Blade hydraulic schematic (Blade Float) (1) Delivery line (2) Blade pump (3) Pilot pump (4) Return line (5) Blade control valve (7) Pilot control valve (8) Pilot oil distribution block (9) Swivel (11) Blade cylinder (12) Line (13) Line relief valves (blade) (14) Main relief valve (blade) (15) Unloading valve (16) Blade control pressure switch (17) Pilot manifold | |
When blade control lever (6) 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 (5). Hydraulic oil in the rod and head ends of blade cylinder (11) 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.