BAIC Steering System Service Manual PDF | Maintenance Guide (EN)

SECTION 5 STEERING SYSTEM SECTION 5 STEERING SYSTEM Group 1 Structure and Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1 Group 2 Operational Checks and Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-13 Group 3 Tests and Adjustments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-21 Group 4 Disassembly and Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-28

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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 : В Steering pump В Steering valve (EHPS) В Steering unit В Accumulators В Steering cylinders The steering pump, the first pump of main pump, draws hydraulic oil from the hydraulic tank. Outlet flow from the pump flows to the priority valve of steering valve. The priority valve of steering 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 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 8' Return line 760F5SE01 5-2 14 LH 9 39 CL RH 7 CR 8 L R Ps MCV Ts S T 27 27 R 11 S1 X1 X2 X3 1 X1 X2 22 28PS 23 B1 B2 24 25 21 S1 L2 L1 S2 L4 L3 Fan & brake pump ELECT 2 1 RONICS 4 3 EF P L L 6 P T 32 34 S P 33 PS M T P1 31 M EF P L B1 S1 L2 1 Main pump (steer 6 Steering unit 7 Accumulator 8 Steering valve (E 8' Electric steering valv 9 Joystick steering lev 11 Shuttle valve ing) 14 Steering cylinder 21 Hydraulic tank 22 Air breather HPS) 23 Return filter e (option) 24 Bypass valve er (option) 25 Strainer 27 Check valve 28 Pressure sensor 31 Motor pump (option) 32 Check block (option) 33 Pressure sensor (option) 34 Check valve (option) 39 Control unit

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1) 1) NEUTRAL NEUTRAL 8' MCV 27 27 11 X1 X2 S1 X3 28 PS 1 X1 X2 22 Return line B1 B2 23 24 21 25 L1 L2 S1 S2 L3 L4 Fan & brake pump 760F5SE02 The steering wheel is not being operated so control spool (G) does not move. The oil from the steering pump enters port P of the priority valve in steering valve (EHPS) 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 (21) through the spool (M). В В В 5-3 14 LH 9 39 CL ELECT 2 1 RONICS 4 3 D EF P L S T R G

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