Part of the JCB Repair Manuals.
All 438 pages of this JCB 8014 Service Manual PDF (OEM #9803/9350-6) focus on one thing: getting your 8014, 8016, 8018, or 8020 mini excavator back in the dirt. Open to the hydraulic section for complete schematics detailing the 'O' ring face seal systems and 'Torque Stop' hose routing. You also get clear wiring diagrams, a dedicated troubleshooting guide, and extensive standard torque settings for zinc-plated fasteners. Verify your starter motor nominal output is hitting 1.1 kW, or tighten the crankshaft carrier to the block at exactly 27 Nm. Guessing at electrical faults costs money and patience. Grab this bookmarked file, pull it up on your shop tablet, and trace the issue right at the machine.
What's Inside This JCB 8014, 8016, 8018, 8020 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-39 | Machine Identification, Torque Settings, Fluids and Lubricants, Retaining Compounds, Service Tool Reference, Serial Number Locations |
| Care and Safety | 40-59 | Safety Notices, Operator Precautions, Safety Labels and Decal Locations |
| Maintenance | 60-113 | Service Requirements, Service Schedules, Fluids and Lubricants, Engine Oil and Filter, Cooling System, Fan Belt, Air Filter, Fuel System Tier 2 and Tier 3, Hydraulic System, Tracks and Running Gear, Fire Extinguisher |
| Attachments | 114-134 | Quick Release Couplings, Bucket Removal and Replacement, Hammermaster 100 Breaker, Quickhitch Rockbreaker, Hand Held Tools |
| Body and Framework | 135-169 | Service Tools, Technical Data, Rivet Nuts, Glazing, Bucket Ram Pivot and Linkage, Dipper, Boom, Kingpost, Cab Tilting |
| Electrics | 170-234 | General Electrical Data, Multimeter Usage, Alternator, Starter Motor, Battery, Wiring Harness Repair, Schematic Circuits Tier 2 and Tier 3, Harness Wire Identification, Engine Harness, Boom Light Harness, ISO/SAE Harness |
| Controls | 235-264 | Servo Hand Controllers, Track Levers, Dozer Lever, Engine Throttle, Control Bar Early and Later Machines |
| Hydraulics | 265-392 | Service Tools, Technical Data, Schematic Symbols, Schematic Circuits Tier 2 and Tier 3, Fault Finding, Hydraulic Contamination, Pressure Testing, Control Valve, Hydraulic Pump, Main and Auxiliary Relief Valves, Pressure Maintenance Valve, Dual Solenoid Valve, Track Motor, Slew Motor, Rotary Coupling, Hydraulic Rams Boom Dipper Bucket Dozer Swing |
| Gearboxes | 393-410 | Technical Data, Track Gearbox Operation, Removal and Replacement, Dismantling and Assembly, Moving a Disabled Machine, Slew Gearbox Removal and Assembly |
| Track and Running Gear | 411-430 | Technical Data, Rubber Track Removal and Replacement, Steel Track Removal and Replacement, Track Guides, Track Rollers, Metallic Face Seals, Driven Sprocket, Idler and Recoil Unit |
| Engine | 431-438 | Service Tools, Technical Data, Engine Specifications Perkins 403C-11 Tier 2 and 403D-11 Tier 3, 3-Cylinder Diesel, Torque Settings |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Blanking plug - rear of cylinder block torque | 7 Nm (0.7 kgf m, 5.2 lbf ft) | p. 437 |
| Crankshaft carrier to block torque | 27 Nm (2.7 kgf m, 19.9 lbf ft) | p. 437 |
| Starter Motor Nominal Output | 1.1 kW | p. 176 |
| Starting Circuit Test - Minimum permissible reading (battery terminals) | 9.5V | p. 185 |
| Splice seal International Protection rating | IP 67 | p. 190 |
| Splice 0.5-1.5 mm (Red) insulation removal dimension | 7mm | p. 190 |
| Main Relief Valve Operating Pressure (Swing/Dozer/Slew) | 160 bar (2320 lbf/in2) | p. 273 |
| Main Relief Valve Operating Pressure (Tracks/Dipper/Aux) | 230 bar (3335 lbf/in2) | p. 273 |
| Fuel Tank Capacity | 23.5 Litres | p. 74 |
| Engine Oil Capacity | 4.0 Litres | p. 74 |
| Hydraulic System Capacity | 30 Litres | p. 74 |
| Track Gearbox Oil Capacity (each) | 0.3 Litres | p. 74 |
JCB 8014, 8016, 8018, 8020 Common Problems This Manual Covers
JCB 8018 mini excavator deadman switch engaged but all hydraulics stopped working completely
Test the servo pressure at the maintenance valve. Check page 273 to confirm the pressure reaches 30 bar. Inspect the deadman switch circuit and hydraulic solenoid wiring. Replace any damaged connectors with IP 67 rated splice seals as detailed on page 190 to restore normal control operation.
Manual Section: Hydraulic System - Fault FindingEngine turns over slowly or machine will not start suddenly in cold weather p. 185
Measure the battery terminal voltage during the starting circuit test. Verify the reading stays above 9.5V as shown on page 185. Check the battery negative to starter earth connection. Ensure the voltage drop does not exceed 0.25V on page 186. Clean and tighten all battery terminals.
Manual Section: Starter Motor - Starting Circuit TestSlew motor lacks torque and boom struggles to swing under heavy loads
Test the main relief valve operating pressure for the slew circuit. Adjust the valve to meet the 160 bar specification listed on page 273. Inspect the slew motor gearbox for oil leaks. Drain and refill the hydraulic system with exactly 30 Litres of fresh fluid using page 74.
Manual Section: Slew Motor and Gearbox - Fault FindingRubber tracks jumping off the idler or making loud popping noises during turns p. 110
Measure the track sag at the center roller. Pump grease into the tensioner cylinder until the track tension measures exactly 55mm as specified on page 110. Lift the machine with the boom to rotate the tracks. Inspect the track gearbox and fill with 0.3 Litres of oil.
Manual Section: Service ProceduresFrequently Asked Questions
Where can I find the official torque chart for JCB 8016 hydraulic connections?
Official torque charts for JCB 8016 hydraulic connections can be found in the 'Standard Torque Settings' section of the manual. Specifically, Table 8 on page 15 provides torque settings for BSP Adaptors, Table 9 for SAE Connections, Table 10 for BSP Hose, and Table 11 for BSP Adaptors with Bonded Washers. For example, a 1/4 inch BSP adaptor should be torqued to 18.0 Nm (1.8 kgf m, 13.0 lbf ft).
How do you fix JCB 8018 mini excavator deadman switch engaged but all hydraulics stopped working completely?
Test the servo pressure at the maintenance valve. Check page 273 to confirm the pressure reaches 30 bar. Inspect the deadman switch circuit and hydraulic solenoid wiring. Replace any damaged connectors with IP 67 rated splice seals as detailed on page 190 to restore normal control operation.
How do you fix engine turns over slowly or machine will not start suddenly in cold weather?
Measure the battery terminal voltage during the starting circuit test. Verify the reading stays above 9.5V as shown on page 185. Check the battery negative to starter earth connection. Ensure the voltage drop does not exceed 0.25V on page 186. Clean and tighten all battery terminals.
How do you fix slew motor lacks torque and boom struggles to swing under heavy loads?
Test the main relief valve operating pressure for the slew circuit. Adjust the valve to meet the 160 bar specification listed on page 273. Inspect the slew motor gearbox for oil leaks. Drain and refill the hydraulic system with exactly 30 Litres of fresh fluid using page 74.
How quickly can I access this manual after buying?
A 438-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Are hydraulic system diagrams in this JCB 8014, 8016, 8018, 8020 Service Manual?
Yes, complete hydraulic schematics with flow diagrams, valve configurations, and pressure specifications are included.
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