Looking for the Daewoo Solar 420LC-V shop manual PDF? This 582-page factory shop manual covers the 2001 Solar track excavator line, and the hydraulic and electrical schematics in it are drawn for the 420LC-V specifically rather than as a generic family drawing. Coverage runs from the electrical schematics through hydraulic troubleshooting with pilot pressure and power mode valve testing, then into step-by-step rebuild procedures for the Rexroth main pump, Kayaba main control valve, swing motor, and Nabuko travel motor. Cylinders, center joint, and track assembly get their own service sections too. Set the 1/2-inch split flange bolts at 2.1 to 2.5 kg-m (15 to 18 ft lb) and snug the T-bolt hose clamps to 0.6-0.7 kg-m. Your excavator is down; get factory numbers, not forum guesses. Bookmarked with a full text layer, so you can jump to any valve section right from the phone in your cab.
What's Inside This Daewoo Solar 420LC-V Manual
| System | Pages | Key Topics |
|---|---|---|
| Track Excavator Safety | 1-22 | To the Operator of a Daewoo Excavator, General Safety Essentials, Location of Safety Labels, Summary of Safety Precautions for Lifting in Digging Mode, Work-Site Precautions, Operation, Equipment, Maintenance, Shipping and Transportation, Lifting with Sling |
| Specifications | 23-47 | Specifications for Solar 420LC-V |
| General Maintenance | 48-74 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 75-135 | Cab, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gear (M105) |
| Lower Structure and Chassis | 136-162 | Track Assembly |
| Engine and Drive Train | 163-195 | Air-Conditioner, Drive Coupling (Main Pump) |
| Hydraulic System Troubleshooting, Testing and Adjustment | 196-230 | General Notes, Hydraulic Schematic, Operation of Working Components, Pilot Pressure, Power Mode Valve, Boom/Front Priority Valve, Pressure Up Valve, Accumulator |
| Center Joint (Swivel) | 231-238 | General Description, Parts List, Troubleshooting, Inspection, Testing, Disassembly, Reassembly |
| Cylinders | 239-258 | General Description, Theory of Operation, Parts List, Special Tools, Disassembly, Reassembly |
| Swing Motor | 259-280 | General Description, Theory of Operation, Relief Valve, Swing Brake Operation, Parts List, Disassembly, Reassembly |
| Travel Motor (with Gearbox) (Nabuko) | 281-330 | Specifications, Structure and Function, Disassembly and Assembly, Maintenance Standard, Brake Valve, Reduction Gear |
| Main Pump (Rexroth) | 331-382 | Sectional View, General Repair Guidelines, Control Module, Rotary Groups, Hydraulic Component Measurement, Tightening Torques |
| Main Control Valve (Kayaba) | 383-452 | General Description, Theory of Operation, Troubleshooting, Disassembly, Reassembly, Installation, Start-Up Procedures |
| Travel Control Valve (with Damper) | 453-482 | General Description, Theory of Operation, Parts List, Troubleshooting, Disassembly, Reassembly, Installation |
| Electrical System | 483-563 | Electrical Schematic (S420LC-V) |
| Attachments | 564-582 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Torque for 'T' Bolt hose clamps (Radiator, air cleaner, boots, etc.) | 0.6 - 0.7 kg•m (55 - 65 in lb) | p. 69 |
| Torque for Worm Drive 1-3/4 in Open Diameter and Under hose clamps (Radiator, air cleaner, boots, etc.) | 0.2 - 0.3 kg•m (20 - 30 in lb) | p. 69 |
| Torque for 1/2" Split Flange | 2.1 - 2.5 kg•m (15 - 18 ft lb) | p. 70 |
| Torque for 3/4" Split Flange | 3.0 - 3.7 kg•m (22 - 27 ft lb) | p. 70 |
| A/C refrigerant high-side pressure (system check) | 8.0 - 10.0 kg/cm2 (114 - 142 psi) | p. 175 |
| A/C refrigerant low-side pressure (system check) | 1.0 kg/cm2 (14 psi) | p. 175 |
| Hydraulic reservoir return line filter rating | 10 micron | p. 201 |
| Pilot circuit filter rating | 10 micron | p. 201 |
| Hydraulic system operating temperature | 50°C (122°F) | p. 201 |
| Fuel Tank Capacity | 550 liters | p. 33 |
| Hydraulic Reservoir Capacity | 265 liters | p. 33 |
Daewoo Solar 420LC-V Common Problems This Manual Covers
Daewoo Solar excavator hydraulic pump whines and cavitates, boom and bucket slow and weak after warm-up
Check the hydraulic reservoir level before anything else. Drain the tank and clean the 80 mesh, 177 micron intake strainer described on page 201, then replace the 10 micron return line filter. Bleed air from the pump housing after refilling; a pump that has run dry even briefly will keep cavitating.
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 201Hydraulic oil temperature climbs into the red during normal digging, functions get spongy when hot
Clean the oil cooler and radiator cores with compressed air, blowing from the fan side first. The oil cooler should hold the system near 50 degrees C (122 degrees F) once airflow is restored, per page 201. While you are in there, retorque the radiator T-bolt hose clamps to 0.6 to 0.7 kg-m (55 to 65 in lb).
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 201Machine pulls to one side during travel, one track weak or slow climbing grades
Verify track tension first; a frozen roller or over-tight track mimics a weak travel motor. Test travel circuit pressure at the motor, which on the 420LC-V should reach the rated 355 kg/cm2 listed on page 284. Drain and inspect the reduction gear oil for metal; the 420LC-V gearbox holds 11 liters.
Manual Section: Travel Motor (with Gearbox) (Nabuko) p. 284Swing jerks or coasts past the stop, hydraulic oil seeping around the swing center joint
Inspect the center joint for external seepage before condemning the swing motor; worn joint seals bleed off pressure and let the house coast. Follow the disassembly and inspection procedure starting on page 231 and replace the full seal kit. Torque any 1 inch split flange connections to 3.7 to 4.8 kg-m (27 to 35 ft lb) on reassembly.
Manual Section: Center Joint (Swivel) p. 231Engine cranks slowly or clicks once, no start after the machine sits overnight in cold weather
Load test both 12V 150AH batteries individually; the 420LC-V runs them in series for the 24 volt system, and page 489 lists the spec. Clean and tighten the ground strap and starter terminal connections, then measure voltage at the starter while cranking. A large drop between battery and starter means a corroded cable, not a bad starter.
Manual Section: Electrical System p. 489Frequently Asked Questions
What are the torque specifications for track roller or swing bearing bolts on Solar V excavators?
The manual provides specific torque values for various fasteners. For example, the M18 socket head capscrew (part 25) used in the travel motor reduction unit requires a torque of 41 kg·m (402 Nm) with Loctite No. 242. p. 320
What are the replacement specifications for hydraulic seals?
The manual states that it is more economical to replace oil seals, O-rings, sealing rings, gaskets, and snap rings when a unit is disassembled rather than waiting for premature failures. You should refer to the latest Micro Fiche and/or Parts Book for the correct replacement items. p. 55
What is the procedure for bleeding air from the swing motor case?
To vent air from the swing motor, disconnect the drain hose and fill the swing motor case with hydraulic oil. Reconnect the hose, start the engine, set the throttle to 'LOW IDLE', and swing the upper structure slowly two full revolutions to the left and right. p. 135
What is the recommended fuel tank capacity for the Solar 340LC-V and Solar 420LC-V?
The fuel tank capacity for both the Solar 340LC-V and the Solar 420LC-V is 550 liters (145 U.S. gal). p. 94
What is the required torque for the counterweight mounting bolts on the Solar 420LC-V?
The mounting bolts for the counterweight on the Solar 420LC-V (and other listed models) must be tightened to 250 kg·m (1,807 ft lb). p. 89
What format is this Daewoo Solar 420LC-V manual in?
Immediate download of the complete 582-page searchable Shop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this Daewoo Solar 420LC-V Shop Manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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