LiuGong CLG950E Hydraulic Excavator Service Manual 2019 Cummins QSG Workshop

Description

Workshop coverage for the CLG950E

This LiuGong CLG950E Hydraulic Excavator Service Manual 2019 Cummins QSG Workshop is the shop reference written for the CLG950E hydraulic excavator with Cummins QSG power (EPA Tier 4f / EU Stage IV / EU Stage V). Publication number 201909001 is dated September 3, 2019. The book walks a technician from safety and basic service data through component function, machine parameters, performance tests, fault-code diagnosis, and full removal and installation of the major assemblies.

The applicable type and model printed on the title page is CLG950E. Parameter tables list the diesel as Cummins QSG12 / Cummins X12: six-cylinder, turbocharged, air-to-air intercooled, water-cooled, 132 mm × 144 mm bore and stroke, 11.8 L displacement, 17:1 compression, ignition order 1-5-3-6-2-4. Rated power is given as 298 kW (400 HP) at 2100 r/min, with maximum torque 2034 N·m at 1400 r/min. Operating weight is 47000/48000 kg, standard bucket 2.2 m³, travel 0–5.5 / 0–3.3 km/h, swing 8.5 r/min, gradeability 35° (70%).

File Details

• Manual type: Service Manual
• Brand / model: LiuGong CLG950E hydraulic excavator
• Engine family: Cummins QSG (QSG12 / X12), EPA Tier 4f / EU Stage IV / EU Stage V
• Language: English
• Page count: 1068
• File format: PDF
• Document number: 201909001
• Publication date on section headers: September 3, 2019

Chapters Covered

• 1 Safety Tips — Safety precautions; precautions for lifting and matching operations
• 2 Basics — How to read the manual; marking of revised version; general torque specifications; unit conversion table; cable identification methods; coating materials; weight table; oils use specifications
• 3 Structure Function and Maintenance — Power system (diesel-related parts; water radiator, hydraulic oil cooler, intercooler and fuel cooler); undercarriage (track frame and tensioner, idler, carrier roller, track roller, sprocket, track, swing bearing); hydraulic system (layout, hydraulic elements, working principle); work implement maintenance references; A/C system; electrical system (engine control, display, electrical control, partial circuits)
• 4 Parameters — Basic parameters; performance parameters of the diesel engine; performance parameters of the complete machine
• 5 Testing and Adjustment — Complete-machine performance tests (engine speed, travel and running speed, travel deflection, swing brake angle and speed, swing-bearing clearance, cylinder action time and settlement, control-lever force and stroke, boom lift and swing, pilot and secondary pilot pressure, solenoid proportional-valve output, main-relief setting); other tests (crankcase blow-by, track tension, minus-feedback pressures N1/N2, residual-pressure release, device exhaust, diode check, travel motor and reduction-gear performance)
• 6 Fault diagnosis — Precautions and basic detection; fault classification; numbered fault codes (battery, charging, pilot switches, air filter, hydraulic-oil temperature, fuel level, water-in-fuel, 5 V sensor power, pump and attachment solenoids, travel/flattening/trenching/flow/power-boost valves, relays, pump and negative-flow pressure sensors, CAN/controller, accelerator, GPS/GSM/GPRS locking, fan solenoids); electrical-system faults E1–E11 and related items; hydraulic and mechanical fault trees (including hydraulic-oil emulsification and abnormal oil-temperature rise)
• 7 Removal and Installation — Power system (engine assembly, coolers, radiator, diesel tank, injectors, seals, cylinder head); undercarriage (rollers, track, sprocket, idler and tensioner, revolving frame, swing bearing); covering parts (hood, counterweight); hydraulic system (center swivel, tank, main control valve, main and fan pumps, travel and hand pilot valves, travel and swing motor/reduction gears, fan valve and motor, attachment-swing pump and valve); work implement (bucket, link and lever, arm, boom, cylinders); A/C compressor and evaporator; cab and floor plate
• 8 Attached drawing — Pump part drawing; hydraulic system schematic; electrical schematic; A/C system schematic

Taken together, the LiuGong CLG950E Hydraulic Excavator Service Manual 2019 Cummins QSG Workshop is a single-machine shop book: it explains how each major system is built and how oil flows, then gives the numbers a bench or field tech uses to judge wear, set pressures, and put assemblies back together without guessing.

Safety, fluids, and fastening data

Chapter 1 treats high-pressure hydraulic oil, accumulators charged with nitrogen only, hot coolant and oil, battery electrolyte, fire and explosion around fuel and wiring, cab guards, and lifting practice (sling angle, wire-rope selection table, signalman rules). Chapter 2 collects workshop constants that appear again during R&I: captive-bolt torques such as M24-10.9 engine-shock and swing-bearing bolts at 1020 N·m, M20-10.9 radiator-frame and swing-reduction bolts at 600 N·m, M42-10.9 counterweight bolts at 460 N·m, plus separate tables for 24° cone O-ring hose connectors, flange hose bolts, and thread-angle connectors.

The weight table is written for crane and sling selection: engine assembly 1000 kg, hydraulic pump 267.5 kg, radiator assembly 383 kg, hydraulic tank (empty) 272 kg, revolving frame 3575 kg, counterweight 9000 kg, boom 3637 kg, arm 1516 kg, track frame 5950 kg, and matching cylinder and roller masses. Oils use specifications list change intervals and fill volumes — engine oil 500 h / 37.8 L, swing-reduction gear oil 1000 h / 14 L, travel-reduction gear oil 1000 h / 15 L × 2, hydraulic oil 2000 h with tank 290 L and system 520 L, cooling system 2000 h / 50 L — and viscosity grades by ambient temperature (API CH-4 engine oils, ISO VG 32/46/68 hydraulic oils, SAE 85W-140 swing and 80W-90 travel gear oils, molybdenum-disulfide lithium grease 2# on pins and the swing bearing).

How the machine is built

Structure Function and Maintenance is the longest technical block. Power-system pages identify DPF and engine mounts, then the stacked cooler package (fuel radiator, hydraulic-oil radiator, shroud, intercooler). Undercarriage coverage gives construction and wear notes for the track frame, tensioner, idler, carrier and track rollers, sprocket, shoes, and swing bearing.

The hydraulic chapter starts with a layout of tank, main pump, fan pump, gear pump, main control valve, octuple solenoid valve, pilot valves, and actuators, then moves into element data and circuit logic. Examples printed in the text include swing motor M5X130CHB at 129.2 cm³/rev with rated 32.4 MPa and maximum 39.2 MPa; gear pump PGF517 at 19 ml/rev; boom / arm / bucket relief at 38.2 ± 0.5 MPa; main-pump flow 2 × 380 L/min; main-relief setting 32.3 MPa with instantaneous supercharge 35.3 MPa; swing-motor relief 28 MPa; travel-motor safety 32.3 MPa; pilot circuit 3.9 MPa. Cylinder sizes are given as boom 2-φ165 × φ115 × 1560 mm, arm 1-φ190 × φ130 × 1980 mm, bucket 1-φ170 × φ120 × 1260 mm. Working-principle pages describe center-bypass and parallel-passage flow for travel, arm, boom, bucket, and swing, plus boom-priority, main overflow, anti-cavitation, hose-burst balance valves, travel-motor brake valves, and the hydraulic fan circuit that varies flow with oil, coolant, and ambient temperature.

Work-implement notes cover boom, arm, and bucket service limits. The electrical section describes engine control, the cab display (hour meter, hydraulic-oil temperature gauge, and related indicators), controller inputs such as hydraulic-oil temperature and level, pump current and fan-speed signals, overheating protection levels (hydraulic oil above 86 °C or coolant above 102 °C at level 1), and CAN communication between engine and main controllers. Air-conditioning data includes 5000 W cooling / 5800 W heating, R134a 950 ± 50 g, and Denso 10S15C compressor with ND-OIL8.

Numbers used on the job

Chapter 4 of the LiuGong CLG950E Hydraulic Excavator Service Manual 2019 Cummins QSG Workshop records complete-vehicle dimensions (overall length 11515 mm, width 3340 mm on 600 mm shoes, height 3810 mm, cab roof 3307 mm, tail swing radius 3640 mm, track gauge 2740 mm) and working-range figures for a 7060 mm boom with 2900 mm arm: maximum digging height 10618 mm, dump height 7578 mm, digging depth 7380 mm, digging radius 11585 mm, bucket digging force 287 kN, arm digging force 263 kN. Electrical system voltage is 24 V with two 12 V batteries, starter 24 V-7.5 kW, alternator 24 V-70 A.

Complete-machine performance standards include idle speeds 1000 ± 30 / 1950 ± 30 r/min (A/C off), 20 m travel times, swing 21 ± 1.5 s per 3 revolutions, swing-bearing vertical clearance ≤ 0.65 mm, cylinder cycle times, settlement limits, lever forces, pilot 3.9–4.1 MPa at high idle, and main-circuit / port-relief check pressures. Engine-only data adds valve lash (intake 0.36 mm, exhaust 0.69 mm) and thermostat opening 82–88 °C.

Testing, codes, and teardown

Testing and Adjustment tells how to measure those same values in the yard: tools, parking attitude, hydraulic-oil temperature window 45–55 °C (or 50 ± 5 °C for pressure work), and data sheets. Other tests cover crankcase blow-by, track sag, N1/N2 negative-flow pressure, safe release of residual line pressure, bleeding the main pump and travel motors after oil or component work, and travel-motor/reduction-gear performance.

Fault diagnosis begins with pre-checks (oil levels, filters, obvious leaks) then splits into controller fault codes and symptom trees. Codes span charging and battery voltage, clogged air filter, hydraulic-oil temperature sensor range and over-temperature (including 86 °C high and 95 °C extremely high paths), fuel and water-in-fuel sensors, pump proportional solenoids, attachment confluence, travel shift, flattening, trenching, flow adjust, power boost, travel lift, fan drive and reverse, pressure sensors on P1/P2 and N1/N2, CAN heartbeat, and telematics lock states. Electrical symptoms E1–E11 cover a dead battery, no-start, cut-out, failed pre-heater, and dead implements. Hydraulic trees address emulsified oil and abnormal temperature rise by checking level, cooler blockage, and fan drive.

Removal and Installation is written as photographed shop sequences with warnings to ground the implement, dump accumulator pressure, and vent the hydraulic tank before opening lines. Procedures cover the diesel assembly and cooling pack, undercarriage pieces, 9000 kg counterweight, center swivel joint, tank, main valve, pumps, pilot valves, travel and swing drives, fan circuit, attachment-swing gear pump, boom/arm/bucket and their cylinders, A/C compressor and evaporator, and the cab. After reassembly the text sends the tech back to refill, circulate oil, and recheck level and leaks using the torque figures from Basics.

Chapter 8 collects the pump part drawing plus hydraulic, electrical, and A/C schematics used when tracing a circuit that the fault-code chapter has already narrowed.

What you can do with this manual

With the LiuGong CLG950E Hydraulic Excavator Service Manual 2019 Cummins QSG Workshop a shop can plan lifts from the printed component weights, choose oils and change intervals from the specification tables, set main, port, swing, travel, and pilot pressures to the published values, time travel and swing against the Chapter 4 standards, follow a numbered code to a sensor, solenoid, or harness, and remove or rebuild the engine package, pumps, valve, drives, and front-end without relying on memory. Using the printed procedures and limits matters on a 47–48 t machine: wrong relief settings, mixed oil brands, or residual pressure left in a line are exactly the conditions the safety and test chapters warn against.

After payment you receive the PDF immediately — no shipping delay. Open it on a phone, tablet, or workshop PC and print the pages you need at the machine.