W345B Series II Material Handler Hydraulic System Stick Hydraulic System Caterpillar


Stick Hydraulic System
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1.1. Schematic for Stick Hydraulic System
2.1. Stick Control
3.2. Introduction
4.2. Stick In
5.2. Stick Out

Schematic for Stick Hydraulic System




Illustration 1g00812428

(1) Stick cylinders

(2) Lines

(3) Line

(4) Stick lowering control valve

(5) Relief valve

(6) Pilot valve

(7) Check valve

(8) Line

(9) Pilot line

(10) Pilot line

(11) Pilot line

(12) Main control valve

(13) Line

(14) Passage

(15) Passage

(16) Passage

(17) Return passage

(18) Passage

(19) Center bypass passage

(20) Control valve (stick II)

(21) Passage

(22) Control valve (stick I)

(23) Parallel feeder passage

(24) Check valve

(25) Pilot line

(26) Pilot line

(27) Center bypass passage

(28) Check valve

(29) Drain line

(30) Shuttle valve

(31) Solenoid valve (fine control)

(32) Pilot line

(33) Shuttle valve

(34) Pilot line

(35) Pilot control valve

(36) Pilot line

(37) Pilot line

(38) Upper pump

(39) Return line

(40) Lower pump

(41) Pilot pump

Stick Control

Introduction




Illustration 2g00820785

Main control valve

(20) Stick II control valve

(22) Stick I control valve

When the stick is moved to the STICK IN position or to the STICK OUT position, stick II control valve (20) is used. When the stick is moved to the STICK OUT position, stick I control valve (22) is used in conjunction with stick II control valve (20). When the stick control valves are activated, hydraulic oil from upper pump (38) and from lower pump (40) flows to stick cylinder (1) .

Stick lowering control valve (4) is located on the head end of stick cylinder (1). When all control levers are in the NEUTRAL position, stick lowering control valve (4) stops oil leakage from the head end of the stick cylinder. Stopping oil leakage prevents stick drift. Stick lowering control valve (4) also prevents the stick from falling if a hydraulic supply line or a supply tube to the stick cylinder fails. The stick lowering control valve also contains a relief valve that controls the pressure in the head end of the stick cylinder.

Reference: For further information on the stick lowering control valve, see Systems Operation, "Control Valve (Stick Lowering)".

Stick In

When the control lever is moved to the STICK IN position, pilot oil from pilot control valve (35) flows through pilot line (36). The oil flow then divides into two paths:

In one path, pilot oil flows through pilot line (11) and into control valve (22). The pilot oil shifts the stem of control valve (22). When the stem shifts, the oil in passage (18) flows through control valve (22) and passage (16). The oil in passage (16) flows through line (3) to the rod end of the stick cylinder.

In the other path, pilot oil flows from pilot control valve (35) through pilot line (9) and into stick lowering control valve (4). The pilot oil shifts pilot valve (6) to the right, which allows oil from the head end of the stick cylinder to return to the hydraulic tank. As oil returns to the tank, the rod retracts and the stick moves inward.

Return oil from the head end flows through line (2) and pilot valve (6). The oil then flows back to the hydraulic tank through return line (39) .

Stick Out

When the control lever is moved to the STICK OUT position, pilot oil from pilot control valve (35) flows through pilot line (37). The pilot oil then divides into two paths:

In one path, pilot oil flows through pilot line (26) and shuttle valve (30) to solenoid valve (31). The oil then flows through pilot line (32), shuttle valve (33), and pilot line (34) into control valve (20). The oil shifts the stem of control valve (20) .

Upper pump oil in center bypass passage (19) and parallel feeder passage (23) flows to line (13). The upper pump oil in line (13) combines with the lower pump oil in passage (18) .

In the second path, pilot oil flows from pilot control valve (35) through pilot line (25) and into control valve (22). The oil shifts the stem of the control valve. The combined oil in passage (18) flows through control valve (22) and line (8). The oil flows from line (8) to stick lowering control valve (4). The oil then flows through check valve (7), and the oil is routed to the head end of the stick cylinder through line (2). The combined pump oil causes the rod to extend at an increased rate of speed. When the rod extends, the stick moves outward.

The return oil from the rod end of the stick cylinder flows through line (3) to passage (16). The oil then flows through control valve (22), return passage (17), and return line (39) to the hydraulic tank.

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