BAIC Steering System Manual PDF - Service Guide for Heavy Equipment (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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-16 Group 4 Disassembly and Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-21

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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 displacement piston pump supplying a load sensing steering system and an closed center loader system. The components of the steering system are : · Steering pump · Priority valve · Steering unit · Accumulators · Steering cylinders The steering pump draws hydraulic oil from the hydraulic tank. Outlet flow from the pump flows to the priority valve. The priority valve preferentially supplies flow, on demand, to the steering unit.

When the machine is steered, the steering unit routes flow to the steer- ing 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 steering pump enters into the main control valve for the operation of the attachment. 5-1

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2. HYDRAULIC CIRCUIT 2. HYDRAULIC CIRCUIT 13 17 18 RH 19 R Electronics T P MCV P Return line 16 CF EF 10 LS 39 Return line X1 X2 S1 P T X3 27 5 X1 T S 32 34 P PS 33 PS M 1 B1 26 31 P1 Return line M L L1 S1 Fan & brake pump 955A5SE01 5-2 13 18 LH CR CL 14 L LS2 P T LS1 L R LS T LS 15 P T LS LS 15 1 Main(steering) pump 10 LS check valve 13 Steering cylinder 14 Steering unit 15 Line check valve 16 Priority valve 17 Accumulator 18 Orifice 19 Joystick steering valve (option) 26 Hydraulic tank 27 Air breather 31 Motor pump (option) 32 Check block (option) 33 Pressure sensor (option) 34 Check valve (option) 39 Check valve

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1) 1) NEUTRAL NEUTRAL 13 13 17 LH RH 14 R L G T MCV P Return line 16 39 Return line S1 D P T X1 X2 X3 5 PS X1 1 B1 Return line L L1 S1 Fan & brake pump 955A5SE02 · · The steering wheel is not being operated so control spool (G) does not move. The oil from the main pump enters port P of the priority valve and the inlet pressure oil moves the spool (D) to the right. Almost all of pump flow goes to the loader system (main control valve) through the EF port and partly flows into the hydraulic tank (26). · 5-3 LS 15 LS 27 26

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