BAIC Steering System Service Manual PDF - Repair Guide (EN)

SECTION 5 STEERING SYSTEM Group 1 Structure and Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1 Group 2 Operational Checks and Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9 Group 3 Tests and Adjustments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-15 Group 4 Disassembly and Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-21

Стр. 1

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 : В Main pump В Steering unit В 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

Стр. 2

2. HYDRAULIC CIRCUIT 2. HYDRAULIC CIRCUIT 10 RH LH LS 3 S SX P 5 Pst T LS 1 S P 27 24 29 PS X1 18 Return line 28 PS M T Return line P1 B1 26 M E/G L L1 S1 17 740F5SE01 5-2 )( )( Priority valve L R T 1 Main pump 3 Main control vavle 5 Steering unit 10 Steering cylinder 17 Hydraulic tank 18 Air breather 19 Return filter 20 Bypass valve 21 Strainer 24 Pressure sensor 26 Motor pump (option) 27 Check block (option) 28 Pressure sensor (option) 29 Check valve (option)

Стр. 3

1) NEUTRAL 10 RH LH LS 3 S SX P 5 Pst T LS Return line 18 Return line Return line B1 E/G L L1 S1 17 740F5SE02 The steering wheel is not being operated so control spool (G) does not move. The oil from the pump enters port P of 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 (17) through the spool (G). 5-3 D )( )( Priority valve L R G T 1

Стр. 4