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Summary of Contents for Daewoo D20S-2
- Page 1 SB2097E00 Aug. 1996 Specifications Systems Operation Testing & Adjusting Disassembly & Assembly New Hydraulic Systems D20/25-2 D20/25/30S-2 G20/25/30S-2 G20/25/30S-2...
- Page 2 If a tool, procedure, work method or operating technique not specifically recommended by DAEWOO is used, you must satisfy yourself that it is safe for you and others. You should also ensure that the product will not be damaged or made unsafe by the operation, Iubrication, maintenance or repair procedures you choose.
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Page 3: Table Of Contents
Index Specifications Hydraulic Control Valve .......... 5 Systems Operation Hydraulic Control Valve ........17 Assembly And Construction ......17 Check Valve ..........21 Flow Control Valve And Relief Valve .... 20 Valve Operation ..........18 Hydraulic System (D20/25/30S-2, G20/25/30S-2, GC20/25/30S-2 Model) ....6 Hydraulic System (D20/25-2 Model Only) .... -
Page 4: Specifications
Specifications Hydraulic Control valve (1) Torque for bolts that hold control valve sections together ....40.5 ± ± • • m (360 18 lb (2) Adjust TILT and sideshift relief valve pressure as CONTROL VALVE shown above. See Relief Valve Pressure Check in Testing And Adjusting. -
Page 5: Systems Operation
Systems Operation Hydraulic System (D20/25/30S-2, G20/25/30S-2, GC20/25/30S-2 Model) IDCS002B Basic Hydrauic Schematic With Standard Lift (1) Lift cylinders. (2) Excess flow protectors. (3) Sideshift cylinder(s)(if equipped). (4) Lowering flow control valve. (5) Hydraulic control valve. (6) Tilt cylinders (7) Relief valve(lift). (8) Relief valve(tilt and sideshift). (9) Hydraulic oil filter. (10) Hydraulic oil tank. - Page 6 The hydraulic system has hydraulic oil tank (10) which holds the oil for gear type hydraulic pump (15). Hydraulic pump (15) sends pressure oil to the power brakes (if equipped), hydraulic and steering systems. Pump oil flows from pump (15) to priority valve (11) where the oil folw divides to the power brakes brake valve (if equipped)(not shown) through line (12) and to the steering gear through line (16).
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Page 7: Systems Operation
IDCS003B Basic Hydraulic Schematic With Standard Lift (1) Lift cylinders. (2) Excess flow protectors. (3) Sideshift cylinder(s)(if equipped). (4) Lowering folw control valve. (5) Hydraulic control valve. (6) Tilt cylinders. (7) Relief valve(lift). (8) Relief valve(tilt and sideshift). (9)Hydraulic oil filter. (10) Hydraulic oil tank. - Page 9 Hydraulic System (D20/25-2 Model Only) IDCS004B Basic Hydraulic Schematic With Standard Lift (1) Lift cylinders. (2) Excess flow protectors. (3) Sideshift cylinder(s)(if equipped). (4) Lowering folw control valve. (5) Hydraulic control valve. (6) Tilt cylinders. (7) Relief valve(lift). (8) Relief valve(tilt and sideshift). (9) Hydraulic oil filter. (10) Hydraulic oil tank.
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Page 10: Systems Operation
The hydraulic system has hydraulic oil tank (10) which holds the oil for gear type hydraulic pump (15). Hydraulic pump (15) sends pressure oil the power brakes (if equipped), hydraulic and steering systems. Pump oil flows from pump (15) to priority valve (11) where the oil folw divides to the power brakes brake valve (if equipped)(not shown) through line (12) and to the steering gear through line (16). -
Page 11: Systems Operation
IDCS005B Basic Hydraulic Schematic With Standard Lift (1) Lift cylinders. (2) Excess flow protectors. (3) Sideshift cylinder(s)(if equipped). (4) Lowering folw control valve. (5) Hydraulic control valve. (6) Tilt cylinders. (7) Relief valve(lift). (8) Relief valve(tilt and sideshift). (9) Hydraulic oil filter. (10) Hydraulic oil tank. -
Page 12: Anti-Stall And Remote Relief Valve
Anti-Stall And Remote Relief Valve The anti-stall valve in combination with the remote relief valve prevent hydraulic overloads at engine idle, which could cause excessive vibration and engine stalling. At engine idle, the anti-stall valve opens ports to the hydraulic control valve and the remote relief valve. -
Page 14: Hydraulic Control Valve
Hydraulic Control Valve IDCS006B (1) Relief Valve. (2) Inlet Body. (3) Center Spring. (4) Switch Bracket. (5) Cam. (6) Center Body. (7) Spool. (8) Tie Stud. (9) Outlet Body. (10) Check Valve. (11) Seal Rings. Assembly And Construction Passages between the bodies connect each section to the common inlet and tank ports. - Page 15 Valve Operation Lift Spool “ ” Pressure to “ ” to tank By-pass blocked “ ” “ ” IDCS007B CENTER blocked By-pass open (1) Control Valve Sensing Orifice. (2) Flow Control And Relief Valve. “ ” to tank (3) Tank Passage. “...
- Page 16 Tilt Spool Auxiliary Spool “ ” to tank “ ” blocked “ ” Pressure to By-pass open “ ” to tank By-pass blocked “ ” “ ” CENTER blocked By-pass open “ ” “ ” CENTER blocked By-pass open “ ”...
- Page 17 Flow Control And Relief Valve Flow Control Earlier design valves were equipped with simple relief valves in the inlet sections. The partial flow by-pass system in the LT valve makes use of a compound type flow control and relief valve arrangement. Sensing the pressure drop across an orifice at the entrance to the by-pass, the valve acting as a control to limit flow through the by-pass to approximately...
- Page 18 Relief Valve If a different relief valve setting is required, the valve sub-assembly should be replaced, Part Setting Number Pressure Model 2625 psi D20-2, D20S-2, D144363 (18,100 kPa) G20S-2, GC20S-2 D144364 D25-2, D25S-2 2825 psi G25S-2, GC25S-2 (19,478kPa D144365 3125 psi...
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Page 19: Testing And Adjusting
Testing And Adjusting Trouble : No motion, slow or jerky action of hydraulic system Troubleshooting Remedy Probable Cause Repair, clean and readjust Relief valve not properly set, or stuck in base and/or worn Below table lists the difficulties which may be Disassemble, clean and Dirt or foreign particles lodged experienced with the unit and the hydraulic system. -
Page 20: Hydraulic System
Hydraulic System Relief Valve Pressure Check Tools Needed Fittings Group IDCS001C CONTROL VALVE Pressure Tap Location (1) Cap. (2) Nipple assembly. Main Relief Tilt, Auxiliary Valve Relief Valve Pressure Pressure With the engine off, remove cap (1) from nipple °æ 500 kPa °æ... -
Page 21: Flow Control Valve Adjustment
Tilt and Sideshift Relief Valve Flow Control Valve Adjustment WARNING Check and Adjustment (1) Flow control valve adjuster. Hydraulic oil, under pressure can remain in the 1. Start the engine and activate the hydraulics until hydraulic system after the engine and pump have the hydraulic oil is at the normal operating been stopped. -
Page 22: Disassembly And Assembly
Disassembly And Assembly General Attaching Parts 1. Remove the four nuts (1) and four tie studs (2). During disassembly, particular attention should be given to identification of parts for reassembly. Spools are 2. Separate the valve sections, being careful not to selectively fitted to valve bodies and must be returned to destroy or lose spacers. - Page 23 Adjustable Flow Control Valve Cleaning, Inspection And Repair 1. Remove the retainer ring (18) and screw out plug stop adjuster (19) from the valve body. 1. Check that all internal passages are clean and free from obstruction. Examine all mating surfaces for 2.
- Page 24 IDCS015B New Hydraulic Systems 27 of 29 Disassembly and Assembly...
- Page 25 Assembly Relief Valve 1. Install a new O-ring (27) on the relief valve plug (26). Assembly is generally performed in reverse order of disassembly. Refer to figure IDCS015B during the 2. Place the relief valve assembly (29) in its bore, following assembly procedure.
- Page 26 End Cap 1. Install new O-ring (12) on the sleeve(11). 2. Insert sleeve (11) into retainer (10). 3. Assemble dust cover (9) and retainer and sleeve with attaching screws (8). 4. Tighten the screws (8) to a torque of 11 - 15 N ¥...
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