When your compact excavator goes down, this 453-page JCB 8025ZTS, 8026CTS, JS30, 8029CTS, 8030ZTS, 8035ZTS service manual PDF (OEM #9803/9410-08) gives you the factory procedures to tear down and rebuild the 2005-2012 machines. You get complete hydraulic schematics tracing fluid through the control valve, detailed electrical circuits with full harness routing data, and step-by-step fault finding for the servo hand controllers. Open to the engine section to find exact valve clearances and firing orders, or jump into the track and running gear teardowns. Lock down the track gearbox mounting bolts at exactly 98 Nm, then confirm your 1/4-inch BSP adaptors are tightened to 18.0 Nm before testing the hydraulics. Stop wasting shop hours trying to guess pump pressures. Grab this digital download, pull it up on your tablet right next to the undercarriage, and get the job done right.
What's Inside This JCB 8025ZTS & variants Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-36 | Standard Torque Settings, Hydraulic Connections, Service Tools |
| Care and Safety | 37-56 | Safety Notices, Safety Labels |
| Maintenance | 57-116 | Routine Maintenance, Fluids, Lubricants and Capacities, Greasing, Electrical System, Fuel System, Hydraulic System, Tracks and Running Gear |
| Attachments | 117-140 | Connecting/Disconnecting Hydraulic Hoses, Buckets, Quickhitch Rockbreaker |
| Body and Framework | 141-184 | Service Procedures, Kingpost, Slew Ring, Air Conditioning (If Installed) |
| Electrics | 185-252 | Service Procedures, Schematic Circuits, Harness Data |
| Controls | 253-274 | Servo Hand Controllers |
| Hydraulics | 275-402 | Technical Data, Basic System Operation, Schematic Circuits, Fault Finding, Service Procedures, Control Valve, Hydraulic Pump, Pressure Maintenance Valve and Dual Solenoid Valve |
| Gearboxes | 403-421 | Track Gearbox, Slew Gearbox - 8025ZTS, 8026CTS, JS30, 8029CTS, 8030ZTS, Slew Gearbox - 8035ZTS |
| Track and Running Gear | 422-447 | Idler and Recoil Unit |
| Engine | 448-453 | Swept Volume, Bore, Stroke, Firing Order, Power Output, Valve Clearance |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track gearbox to machine mounting bolts torque | 98 Nm (72 lbf ft, 10 kgf m) | p. 408 |
| Slew ring to machine undercarriage mounting bolts torque | 160 Nm (118 lbf ft, 16.3 kgf m) | p. 166 |
| M5 Metric Grade 8.8 Fasteners Torque (Condition 1) | 5.8 Nm | p. 10 |
| M10 Metric Grade 10.9 Fasteners Torque (Condition 1) | 67.0 Nm | p. 11 |
| BSP Adaptor 1/4 in Torque | 18.0 Nm | p. 13 |
| Fuel Tank Capacity | 36.5 Litres | p. 72 |
| Engine Oil Capacity | 4.5 Litres | p. 72 |
| Engine Coolant Capacity | 8.5 Litres | p. 72 |
| Hydraulic Tank Capacity | 40 Litres | p. 72 |
| Battery Voltage | 12 V | p. 188 |
| Alternator Nominal Output | 12 Volts, 65 Amp | p. 188 |
| Pumps P1 and P2 Flow Rate | 34.3 l/min @ 2200 rev/min | p. 280 |
JCB 8025ZTS & variants Common Problems This Manual Covers
JCB 8025ZTS excavator boom operates slowly and hydraulic pump whines during heavy lifting operations p. 280
Test the hydraulic system flow rate as shown on page 280. Verify pumps P1 and P2 maintain a flow rate of 34.3 l/min at 2200 rev/min. Inspect the 40 Litres hydraulic tank for low fluid levels and top off if necessary.
Manual Section: HydraulicsExcavator clicks when turning the key but starter motor refuses to crank the engine p. 188
Measure the battery voltage at the terminals using a multimeter. Ensure the system provides a steady 12 V output as specified on page 188. Clean all battery cable connections and check the alternator output for a nominal 65 Amp charge rate.
Manual Section: ElectricsEngine ticks loudly from the top end and loses power when warming up under load p. 451
Remove the valve cover and inspect the valvetrain components. Measure the cold engine valve clearance and adjust it to exactly 0.2 mm. Reference the technical specifications on page 451 for proper measurement techniques. Torque all M10 Grade 10.9 fasteners to 67.0 Nm.
Manual Section: EngineClunking noise from the undercarriage when shifting from forward to reverse tracking directions p. 408
Inspect the final drive assemblies for loose hardware. Torque the track gearbox to machine mounting bolts to 98 Nm (72 lbf ft, 10 kgf m) as indicated on page 408. Replace any damaged M10 fasteners and tighten them to 67.0 Nm.
Manual Section: GearboxesFrequently Asked Questions
What are the torque specs for JCB 8029CTS track motor bolts?
When fitting the track gearbox to the mainframe, tighten the capscrews G to 215 - 275 Nm (160 - 200 lbf ft). Additionally, the bolts (Item F) that detach the motor/gearbox sprocket assembly from the machine should be torqued to 98 Nm (72 lbf ft, 10 kgf m).
How do you fix JCB 8025ZTS excavator boom operates slowly and hydraulic pump whines during heavy lifting operations?
Test the hydraulic system flow rate as shown on page 280. Verify pumps P1 and P2 maintain a flow rate of 34.3 l/min at 2200 rev/min. Inspect the 40 Litres hydraulic tank for low fluid levels and top off if necessary.
How do you fix excavator clicks when turning the key but starter motor refuses to crank the engine?
Measure the battery voltage at the terminals using a multimeter. Ensure the system provides a steady 12 V output as specified on page 188. Clean all battery cable connections and check the alternator output for a nominal 65 Amp charge rate.
How do you fix engine ticks loudly from the top end and loses power when warming up under load?
Remove the valve cover and inspect the valvetrain components. Measure the cold engine valve clearance and adjust it to exactly 0.2 mm. Reference the technical specifications on page 451 for proper measurement techniques. Torque all M10 Grade 10.9 fasteners to 67.0 Nm.
What format is this manual in?
Immediate download of the complete 453-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this JCB 8025ZTS & variants manual include wiring diagrams?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. The text is generally crisp and easy to read throughout the manual. Diagrams and illustrations appear to be raster images, but their labels are readable, and the images are clear enough for identification. Pages are mostly clean, though some exhibit slight skewing, and there are several intentionally blank pages included as filler.
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