Seat Steering System Manual (EN)

SECTION 5 STEERING SYSTEM SECTION 5 STEERING SYSTEM Group 1 Structure and Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1 Group 2 Operational Checks and Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-8 Group 3 Tests and Adjustments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-14 Group 4 Disassembly and Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-20

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SECTION 5 STEERING SYSTEM SECTION 5 STEERING SYSTEM GROUP 1 STRUCTURE AND FUNCTION GROUP 1 STRUCTURE AND FUNCTION 1. OUTLINE 1. OUTLINE The steering system of this machine consists of a variable piston pump supplying a load sensing steering system and an closed center loader system. The components of the steering system are : · Main pump · Steering unit · Steering cylinders The main pump draws hydraulic oil from the hydraulic tank. Outlet flow from the pump flows to the priority valve in main control valve. The priority valve in main control valve preferentially supplies flow, on demand, to the steering unit.

When the machine is steered, the steering unit routes flow to the steering cylinders to articulate the machine. When the machine is not being steered, or if pump flow is greater than steering flow, the priority valve supplies flow to the loader system. That is, output flow from the pump enters into the main control valve for the operation of the attach- ment. 5-1

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2. HYDRAULIC CIRCUIT 2. HYDRAULIC CIRCUIT 16 19 16 Joystick steering RCV CONTROL UNIT LH RH 22 3 D Pr TPr PVE CR CL P3 LS3 Electronics LS2 17 R L DLS T P LS1 L R T3 LS T P 18 Return line MCV 1 39 S P 37 9 32 PS X1 38 PS M T Return line Return line P1 B1 36 M E/G 31 L L1 S1 940A5SE01 5-2 Priority valve P 1 Main pump 3 Main control vavle 9 Pressure sensor 16 Steering cylinder 17 Steering unit 18 Line check valve 19 Accumulator 22 Joystick steering vlave(opt) 31 Hydraulic tank 32 Air breather 35 Strainer 36 Motor pump (option) 37 Check block (option) 38 Pressure sensor (option) 39 Check valve (option)

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1) 1) NEUTRAL NEUTRAL Return line 940A5SE02 The steering wheel is not being operated so control spool (G) does not move. The oil from the pump enters the priority valve in main control valve and the inlet pressure oil moves the spool (D). Almost all of pump flow goes to the loader system and partly flows into the hydraulic tank (31) through the spool (G). 5-3 16 19 20 LH 17 L T LS T P 18 16 20 RH D 3 Pr TPr P3 LS3 DLS D R Priority valve T3 G MCV Return line X1 32 Re Return line 31 L1 L 1 37 39 9 PS S P 8 PS M T B1 E/G S1

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