BAIC HL940 Loader Service Manual & Repair Guide PDF Download (EN)

SECTION 6 WORK EQUIPMENT SECTION 6 WORK EQUIPMENT Group 1 Structure and Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1 Group 2 Operational Checks and Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-44 Group 3 Tests and Adjustments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-54 Group 4 Disassembly and Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-67

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SECTION 6 WORK EQUIPMENT GROUP 1 STRUCTURE AND FUNCTION GROUP 1 STRUCTURE AND FUNCTION 1. HYDRAULIC SYSTEM OUTLINE 1. HYDRAULIC SYSTEM OUTLINE The loader hydraulic system is a pilot operated, closed center system which is supplied with flow from the variable displacement piston main hydraulic pump. The loader system components are : В Main pump В Main control valve В Bucket cylinder В Boom cylinders В Remote control valve (Pilot control valve) В Safety valve The main control valve is load pressure independent flow distribution system which routes flow to the boom, bucket or auxiliary cylinders (not shown) when the respective spools are shifted.

Flow from the main pump is routed to the main control valve where pump outlet pressure is reduced to pilot circuit pressure. The main control valve flow to the remote control valve. The remote control valve routed flow to either end of each spool valve section in the main control valve to control spool stroke. A accumulator mounted on safety valve supplies a secondary pressure source to operated remote control valve so the boom can be lowered if the engine is off. The return circuit for the main hydraulic system have return filter inside the hydraulic tank. The return filter uses a filter element and a bypass valve. The bypass valve is located in the upside of filter. 6-1

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2. HYDRAULIC CIRCUIT 2.

HYDRAULIC CIRCUIT (HL940, HL940XT) 1 Main pump 2 Fan & brake pump 3 Main control valve 4 Remote control valve 5 Steering unit 6 Check valve 7 Safety valve 8 Boom cylinder 9 Bucket cylinder 10 Steering cylinder 11 Cut-off valve 12 Accumulator 13 Accumulator 14 Pressure sensor 15 Brake valve 16 Pressure switch 17 Hydraulic tank 18 Air breather 19 Return filter 20 By pass valve 21 Strainer 22 Oil cooler 23 Pressure sensor 24 Fan motor 25 Directional valve 26 Pump motor (opt) 27 Check block (opt) 28 Pressure sensor (opt) 29 Check valve (opt) 30 Ride control valve (opt) 31 Accumulator (opt) 32 Quick coupler cylinder (opt) 33 Solenoid valve (opt) 34 Accumulator 6-2 9 31 30 Sp T LS a1 3 S A1 SX ( ) ( ) B P ) ( DUMP A Pst ) ( ROLLBACK 34 T 10 ) ( ) ( LH RH b1 5 B.D/F B.U CRAWD DUMP T P 1 3 4 2 1.1 2.1 5 L A1 7 R T P1 T P LS 6 14 PS 27 29 23 X1 1 18 PS S P 28 PS M T P1 B1 19 20 26 E/G M 21 S1 L1 L 17 8 LH RH 23 PS PS 23 a2 a3 B1 A2 B2 A3 B3 DOWNFLOATING UP b2 b3 15 FRONT P1 A1 T1 16 P2 13 13 T2 A2 12 14 REAR 11 S1 B1 B2 S2 S3 PS C5 C6 G1 32 C1 C3 C4 PARKING T/M P B3 33 PS C2 G2 14 2 4 PS PP T1 T2 3 1 22 D 27 29 23 PS S P 28 PS M T P1 B1 26 M P A A B B T 24 2 B 25 S1 L 9406WE01 SX P ( ) ( ) DUMP ) ( ) ( ROLLBACK UP DOWNFLOATING Pst T

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HYDRAULIC CIRCUIT HYDRAULIC CIRCUIT (HL940TM) 1 Main pump 2 Fan & brake pump 3 Main control valve 4 Remote control valve 5 Steering unit 6 Check valve 7 Safety valve 8 Boom cylinder 9 Bucket cylinder 10 Steering cylinder 11 Cut-off valve 12 Accumulator 13 Accumulator 14 Pressure sensor 15 Brake valve 16 Pressure switch 17 Hydraulic tank 18 Air breather 19 Return filter 20 By pass valve 21 Strainer 22 Oil cooler 23 Pressure sensor 24 Fan motor 25 Directional valve 26 Pump motor (opt) 27 Check block (opt) 28 Pressure sensor (opt) 29 Check valve (opt) 30 Ride control valve (opt) 31 Accumulator (opt) 32 Quick coupler cylinder (opt) 33 Solenoid valve (opt) 34 Accumulator 6-3 31 30 Sp T LS a1 3 S A1 SX ( ) ( ) B P ) ( DUMP A Pst ) ( ROLLBACK 34 T 10 ) ( ) ( LH RH b1 5 B.D/F B.U CRAWD DUMP T P 1 3 4 2 1.1 2.1 5 L A1 7 R T P1 T P LS 6 14 PS 27 29 23 X1 1 18 PS S P 28 PS M T P1 B1 19 20 26 E/G M 21 S1 L1 L 17 9 8 LH RH 23 PS PS 23 a2 a3 B1 A2 B2 A3 B3 DOWNFLOATING UP b2 b3 15 FRONT P1 A1 T1 16 P2 13 13 T2 A2 12 14 REAR 11 S1 B1 B2 S2 S3 PS C5 C6 G1 32 C1 C3 C4 PARKING T/M P B3 33 PS C2 G2 14 2 4 PS PP T1 T2 3 1 22 D 27 29 23 PS S P 28 PS M T P1 B1 26 M P A A B B T 24 2 B 25 S1 L 940TM6WE01 SX P ( ) ( ) DUMP ) ( ) ( ROLLBACK UP DOWNFLOATING Pst T b1 5 B.D/F B.U CRAWD DUMP T P 1 3 4 2 1.1 2.1 A1 7 P1 T 14 PS X1 1 18 19 20 21 L1 L 17

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