JCB wrote these 1,420 pages (OEM #9813/2700) to cover four excavators at once: the 85 Z-1, 86 C-1, 90 Z-1, and 100 C-1. Hydraulic schematics trace fluid paths through the variable displacement pump, slew motor, and every cylinder ram on the machine; the wiring diagrams follow each harness from main frame out to the boom work lights. The electrical section alone documents 17 fault codes alongside connector pinout charts and calibration steps, and step-by-step procedures cover engine internals, track systems, and the full hydraulic control valve block. Torque the track roller mounting bolts to 259 Nm and pull the slew gearbox capscrews to 86 Nm. No more chasing numbers across three forums. Everything is bookmarked by system and searchable by keyword, so the next answer is one tap away on whatever device rides out to the 86 C-1.
What's Inside This JCB 100 C-1, 85 Z-1, 86 C-1, 90 Z-1 Manual
| System | Pages | Key Topics |
|---|---|---|
| Machine | 5-28 | Safety (- Yours and Others, Warnings, Maintenance Safety, Operating Safety, Worksite Safety, Risk Assessment, Maintenance Positions, Using the Manual) |
| Attachments, Couplings and Load Handling | 29-50 | Excavator Arm Quickhitch (General, Hydraulic Quickhitch), Bucket (General, Teeth), Rockbreaker (General), Acronyms Glossary |
| Body and Framework | 51-114 | Moveable Panel and Cover (General, Engine Compartment, Hydraulic Compartment), Excavator Arm (General, Boom, Dipper, Tipping Linkage), Dozer Blade (General), Slew Ring (General) |
| Operator Station | 115-164 | Window (General), Operator Seat (General), Seat Belt (General), Controls (General, Excavator Arm, Dozer Blade, Auxiliary Circuit, Track), Safety Label/Chart (General) |
| Heating, Ventilating and Air-Conditioning (HVAC) | 165-212 | HVAC Unit (Evaporator, Expansion Valve), Heater Unit (General), Compressor (General), Receiver Drier (General), Condenser (General), Heater Valve (General), Filter (General) |
| Engine | 213-498 | Crankcase (General, Jet), Cylinder Head (General), Bedplate (General), Crankshaft (General, Main Bearing, Rear Oil Seal, Flange, Phonic Wheel), Camshaft (General |
| Fuel and Exhaust System | 499-648 | Level Sender (General), Water Separator (General, Water in Fuel Sensor), Injection (General, Injector, Injector Sleeve, Rail, Pump, High Pressure Rail Valve), Fuel Pump (General) |
| Cooling System | 649-682 | Expansion Tank (General), Pump (General), Thermostat (General), Hose (General), Acronyms Glossary |
| Driveline | 683-728 | Track (General, Steel Track, Shoe Plate, Link, Rubber Track, Gearbox Sprocket, Idler Wheel, Top Roller, Bottom Roller, Tensioner/Recoil Unit, Grease Cylinder) |
| Hydraulic System | 729-926 | Gearbox (General, Track, Slew), Variable Displacement Pump (General), Cylinder Ram (General, Bucket Crowd, Dipper, Boom, Swing, Dozer Blade, Dozer Angle, Seal Kit) |
| Electrical System | 927-1318 | Battery (General, Isolator Switch), Power Distribution (General) |
| Fasteners and Fixings | 1319-1338 | Screws (General), Bolts (General), Threaded Insert (General) |
| Consumable Products | 1339-1384 | Oil (General, Engine), Grease (General), Fluids (General, Antifreeze), Locking Fluids (General), Solvents and Primers (General), Adhesive (General), Sealant (General) |
| After Sales | 1385-1420 | Maintenance Schedules (General, Maintenance Intervals, Pre-Start Cold Checks, Service Points and Fluid Levels, Functional Tests and Final Inspection) |
Every system also includes general.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track Roller Mounting Bolts Torque | 259 Nm | p. 80 |
| Slew Gearbox Capscrews Torque | 86 Nm | p. 144 |
| Dipper Weight | 210kg | p. 56 |
| Kingpost Weight | 244kg | p. 56 |
| Boom Pivot Pin Reference Diameter | 64.94mm | p. 64 |
| HVAC Refrigerant Normal Charge | 0.775kg | p. 171 |
| Engine Max. Operating Speed | 2200 RPM | p. 222 |
| Engine Oil Pressure Switch Setting | 0.8 ± 0.1bar | p. 222 |
| Oil Filter Max Flow Rate | 3.17L/min | p. 304 |
| Valve Stem Diameter (Inlet) | 6.928-6.943mm | p. 324 |
| Wastegate Control Valve Hose Pressure | 1.25bar (18.1psi) | p. 632 |
| Coolant Pump Flow Rate | 75L/min | p. 664 |
JCB 100 C-1, 85 Z-1, 86 C-1, 90 Z-1 Common Problems This Manual Covers
JCB 86 C-1 hydraulic pump whining noise at startup, bucket and boom cycles slow
Begin at the hydraulic oil level: total system capacity is 118L (page 737), and a low charge is the leading cause of pump noise and sluggish cycles. Work the fault diagnosis chart, focusing on the pump-noisy and fault-in-all-services entries. Then inspect the suction strainer for blockage and check that oil viscosity matches your operating temperature.
Manual Section: Hydraulic SystemEngine cranks slowly and won't fire on cold morning starts, no-start condition p. 222
Test glow plug operation and battery voltage under crank load first. Drain accumulated water from the fuel separator and confirm the tank isn't empty. Oil pressure switch calibration should read 0.8 ± 0.1 bar (page 222), with the max operating speed target at 2200 RPM. Then work through the engine fault-finding chart in the Engine section.
Manual Section: EngineBoom or dipper arm drifts down gradually with joystick held in neutral
Isolate it by capping the hose at the valve port and timing the load drop. If drift stops, the cylinder rod seal is worn; if it continues, the control valve spool is bypassing internally. Refer to hydraulic troubleshooting, and confirm the oil is at the full 118L system capacity (page 737) before condemning any component.
Manual Section: Hydraulic SystemTrack motor loses holding power on steep slope, machine will not hold position
Inspect the travel motor for external oil leaks at the shaft seal and reduction gear case; any leak there bleeds off holding brake pressure. Follow the driveline fault chart starting at page 683. On 85 Z-1 and 86 C-1 machines, confirm travel speed stays at or below 5 km/h (3.1 mph) on grade (page 688) and that the speed transition works correctly.
Manual Section: DrivelineCab air conditioning blows warm air, compressor clutch cycling on and off rapidly p. 171
Recover the refrigerant and weigh it: correct fill is 0.775 kg (page 171). If it's undercharged, pressure-test the lines and check the receiver drier for leaks before recharging. Run the diagnostic tests from page 179 for rapid clutch cycling. A failed high-pressure switch or a blocked condenser can throw the same symptom even with a full charge.
Manual Section: Heating, Ventilating and Air-Conditioning (HVAC)Yellow warning light stays on at startup, fault codes active on display panel
Connect the electronic diagnostic system and pull the active codes from the fault code table. Read the warning colour: yellow flags a non-critical fault, red calls for immediate shutdown. Cross-reference every code description before you touch a component. For engine-related codes, confirm the oil pressure switch is set to 0.8 ± 0.1 bar (page 222) as part of the pass.
Manual Section: Electrical SystemFrequently Asked Questions
What does the JCB 85Z-1 / 86C-1 / 90Z-1 / 100C-1 error code mean?
Fault codes are listed in a table with descriptions, warning display colours, and severity. Code B1600, for example, reads "Actuator Stuck Closed - Engine started without crank signal present," carries a "None" display colour, and rates as "Trivial." For any specific code, check the Fault Code Technical Data section.
What are the torque specs for JCB 85Z-1 / 86C-1 / 90Z-1 / 100C-1?
Torque figures for the various fasteners are tabulated. Internal hexagon headed capscrews (Zinc), for instance, run from 2 N·m on 3mm bolts up to 1,332 N·m on 24mm bolts. Component-specific values appear in their own sections too, such as cylinder head bolts at 40 N·m first stage, 70 N·m second stage, and 120 N·m third stage.
How do I put a JCB 100C-1 or 90Z-1 into service mode?
A 'Maintenance Positions' procedure makes the machine safe for service: park on level ground, lower the dozer and excavator arm, stop the engine, discharge hydraulic pressure (PIL 30-00), isolate the controls, and disconnect the battery (PIL 33-03). For electronic diagnostics, launch JCB Servicemaster on a laptop, connect to the machine's CAN bus, and switch on the ignition to reach the diagnostic functions.
How to reset JCB 85Z-1 service light
Service lights are usually triggered by stored fault codes. The JCB Servicemaster diagnostic software has an "Erase Fault Codes" function that clears them from the ECM memory, which in turn drops the associated warning lights.
What format is this manual in?
Immediate download of the full 1,420-page searchable Service Manual. Open it on any device, whether that's the laptop at your desk or your phone out in the field.
Can I print specific sections of this JCB 100 C-1, 85 Z-1, 86 C-1, 90 Z-1?
Yes. Print as many copies as you want; there are no restrictions. Plenty of mechanics print just the section they need and carry it onto the shop floor.
Can I find wiring schematics in this JCB 100 C-1, 85 Z-1, 86 C-1, 90 Z-1 manual?
Yes. Full electrical schematics are included, with wire colours, connector locations, and circuit descriptions.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy most of the text. The text quality is generally crisp and easy to read throughout the manual. Diagrams and illustrations are raster images, with some being clear and others, particularly hydraulic schematics, appearing somewhat blurry, though their labels are mostly readable. Pages are clean with minimal scan artifacts, and there are several "Notes:" pages that serve as filler.
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